OLEDB_Enum.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Data / System / Data / OleDb / OLEDB_Enum.cs / 1 / OLEDB_Enum.cs

                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.OleDb {
 
    using System;
    using System.ComponentModel;
    using System.Data.Common;
    using System.Diagnostics; 
    using System.Globalization;
    using System.Runtime.InteropServices; 
 
    internal enum DBStatus { // from 4214.0
        S_OK                 = 0, 
        E_BADACCESSOR        = 1,
        E_CANTCONVERTVALUE   = 2,
        S_ISNULL             = 3,
        S_TRUNCATED          = 4, 
        E_SIGNMISMATCH       = 5,
        E_DATAOVERFLOW       = 6, 
        E_CANTCREATE         = 7, 
        E_UNAVAILABLE        = 8,
        E_PERMISSIONDENIED   = 9, 
        E_INTEGRITYVIOLATION = 10,
        E_SCHEMAVIOLATION    = 11,
        E_BADSTATUS          = 12,
        S_DEFAULT            = 13, 
        S_CELLEMPTY          = 14, // 2.0
        S_IGNORE             = 15, // 2.0 
        E_DOESNOTEXIST       = 16, // 2.1 
        E_INVALIDURL         = 17, // 2.1
        E_RESOURCELOCKED     = 18, // 2.1 
        E_RESOURCEEXISTS     = 19, // 2.1
        E_CANNOTCOMPLETE     = 20, // 2.1
        E_VOLUMENOTFOUND     = 21, // 2.1
        E_OUTOFSPACE         = 22, // 2.1 
        S_CANNOTDELETESOURCE = 23, // 2.1
        E_READONLY           = 24, // 2.1 
        E_RESOURCEOUTOFSCOPE = 25, // 2.1 
        S_ALREADYEXISTS      = 26, // 2.1
        E_CANCELED           = 27, // 2.5 
        E_NOTCOLLECTION      = 28, // 2.5
        S_ROWSETCOLUMN       = 29, // 2.6
    }
 
    sealed internal class NativeDBType { // from 4214.0
        // Variant compatible 
        internal const short EMPTY         = 0;       // 
        internal const short NULL          = 1;       //
        internal const short I2            = 2;       // 
        internal const short I4            = 3;       //
        internal const short R4            = 4;       //
        internal const short R8            = 5;       //
        internal const short CY            = 6;       // 
        internal const short DATE          = 7;       //
        internal const short BSTR          = 8;       // 
        internal const short IDISPATCH     = 9;       // 
        internal const short ERROR         = 10;      //
        internal const short BOOL          = 11;      // 
        internal const short VARIANT       = 12;      //
        internal const short IUNKNOWN      = 13;      //
        internal const short DECIMAL       = 14;      //
        internal const short I1            = 16;      // 
        internal const short UI1           = 17;      //
        internal const short UI2           = 18;      // 
        internal const short UI4           = 19;      // 
        internal const short I8            = 20;      //
        internal const short UI8           = 21;      // 
        internal const short FILETIME      = 64;      // 2.0
        internal const short DBUTCDATETIME = 65;      // 9.0
        internal const short DBTIME_EX     = 66;      // 9.0
        internal const short GUID          = 72;      // 
        internal const short BYTES         = 128;     //
        internal const short STR           = 129;     // 
        internal const short WSTR          = 130;     // 
        internal const short NUMERIC       = 131;     // with potential overflow
        internal const short UDT           = 132;     // should never be encountered 
        internal const short DBDATE        = 133;     //
        internal const short DBTIME        = 134;     //
        internal const short DBTIMESTAMP   = 135;     // granularity reduced from 1ns to 100ns (sql is 3.33 milli seconds)
        internal const short HCHAPTER      = 136;     // 1.5 
        internal const short PROPVARIANT   = 138;     // 2.0 - as variant
        internal const short VARNUMERIC    = 139;     // 2.0 - as string else ConversionException 
        internal const short XML           = 141;     // 9.0 
        internal const short VECTOR        = unchecked((short)0x1000);
        internal const short ARRAY         = unchecked((short)0x2000); 
        internal const short BYREF         = unchecked((short)0x4000);  //
        internal const short RESERVED      = unchecked((short)0x8000);  // SystemException

        // high mask 
        internal const short HighMask  = unchecked((short)0xf000);
 
        static internal bool HasHighBit(short value) { 
            return (0 != (HighMask & value));
        } 
        /*
        static internal bool IsArray(short value) {
            return (ARRAY == (HighMask & value));
        } 
        static internal bool IsByRef(short value) {
            return (BYREF == (HighMask & value)); 
        } 
        static internal bool IsReserved(short value) {
            return (RESERVED == (HighMask & value)); 
        }
        static internal bool IsVector(short value) {
            return (VECTOR == (HighMask & value));
        } 
        static internal int GetLowBits(short value) {
            return (value & ~HighMask); 
        } 
        */
 
        private const string S_BINARY        = "DBTYPE_BINARY"; // DBTYPE_BYTES
        private const string S_BOOL          = "DBTYPE_BOOL";
        private const string S_BSTR          = "DBTYPE_BSTR";
        private const string S_CHAR          = "DBTYPE_CHAR";  // DBTYPE_STR 
        private const string S_CY            = "DBTYPE_CY";
        private const string S_DATE          = "DBTYPE_DATE"; 
        private const string S_DBDATE        = "DBTYPE_DBDATE"; 
        private const string S_DBTIME        = "DBTYPE_DBTIME";
        private const string S_DBTIMESTAMP   = "DBTYPE_DBTIMESTAMP"; 
        private const string S_DECIMAL       = "DBTYPE_DECIMAL";
        private const string S_ERROR         = "DBTYPE_ERROR";
        private const string S_FILETIME      = "DBTYPE_FILETIME";
        private const string S_GUID          = "DBTYPE_GUID"; 
        private const string S_I1            = "DBTYPE_I1";
        private const string S_I2            = "DBTYPE_I2"; 
        private const string S_I4            = "DBTYPE_I4"; 
        private const string S_I8            = "DBTYPE_I8";
        private const string S_IDISPATCH     = "DBTYPE_IDISPATCH"; 
        private const string S_IUNKNOWN      = "DBTYPE_IUNKNOWN";
        private const string S_LONGVARBINARY = "DBTYPE_LONGVARBINARY"; // DBTYPE_BYTES
        private const string S_LONGVARCHAR   = "DBTYPE_LONGVARCHAR"; // DBTYPE_STR
        private const string S_NUMERIC       = "DBTYPE_NUMERIC"; 
        private const string S_PROPVARIANT   = "DBTYPE_PROPVARIANT";
        private const string S_R4            = "DBTYPE_R4"; 
        private const string S_R8            = "DBTYPE_R8"; 
        private const string S_UDT           = "DBTYPE_UDT";
        private const string S_UI1           = "DBTYPE_UI1"; 
        private const string S_UI2           = "DBTYPE_UI2";
        private const string S_UI4           = "DBTYPE_UI4";
        private const string S_UI8           = "DBTYPE_UI8";
        private const string S_VARBINARY     = "DBTYPE_VARBINARY"; // DBTYPE_BYTES 
        private const string S_VARCHAR       = "DBTYPE_VARCHAR"; // DBTYPE_STR
        private const string S_VARIANT       = "DBTYPE_VARIANT"; 
        private const string S_VARNUMERIC    = "DBTYPE_VARNUMERIC"; 
        private const string S_WCHAR         = "DBTYPE_WCHAR"; // DBTYPE_WSTR
        private const string S_WVARCHAR      = "DBTYPE_WVARCHAR"; // DBTYPE_WSTR 
        private const string S_WLONGVARCHAR  = "DBTYPE_WLONGVARCHAR"; // DBTYPE_WSTR
        private const string S_XML           = "DBTYPE_XML";

        static private readonly NativeDBType D_Binary           = new NativeDBType(0xff, -1,                 true,  false, OleDbType.Binary,           NativeDBType.BYTES,       S_BINARY,        typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); //  0 
        static private readonly NativeDBType D_Boolean          = new NativeDBType(0xff,  2,                 true,  false, OleDbType.Boolean,          NativeDBType.BOOL,        S_BOOL,          typeof(System.Boolean),  NativeDBType.BOOL,        DbType.Boolean   ); //  1 - integer2 (variant_bool)
        static private readonly NativeDBType D_BSTR             = new NativeDBType(0xff, ADP.PtrSize,        false, false, OleDbType.BSTR,             NativeDBType.BSTR,        S_BSTR,          typeof(System.String),   NativeDBType.BSTR,        DbType.String    ); //  2 - integer4 (pointer) 
        static private readonly NativeDBType D_Char             = new NativeDBType(0xff, -1,                 true,  false, OleDbType.Char,             NativeDBType.STR,         S_CHAR,          typeof(System.String),   NativeDBType.WSTR/*STR*/, DbType.AnsiStringFixedLength); //  3 - (ansi pointer) 
        static private readonly NativeDBType D_Currency         = new NativeDBType(  19,  8,                 true,  false, OleDbType.Currency,         NativeDBType.CY,          S_CY,            typeof(System.Decimal),  NativeDBType.CY,          DbType.Currency  ); //  4 - integer8
        static private readonly NativeDBType D_Date             = new NativeDBType(0xff,  8,                 true,  false, OleDbType.Date,             NativeDBType.DATE,        S_DATE,          typeof(System.DateTime), NativeDBType.DATE,        DbType.DateTime  ); //  5 - double 
        static private readonly NativeDBType D_DBDate           = new NativeDBType(0xff,  6,                 true,  false, OleDbType.DBDate,           NativeDBType.DBDATE,      S_DBDATE,        typeof(System.DateTime), NativeDBType.DBDATE,      DbType.Date      ); //  6 - (tagDBDate)
        static private readonly NativeDBType D_DBTime           = new NativeDBType(0xff,  6,                 true,  false, OleDbType.DBTime,           NativeDBType.DBTIME,      S_DBTIME,        typeof(System.TimeSpan), NativeDBType.DBTIME,      DbType.Time      ); //  7 - (tagDBTime)
        static private readonly NativeDBType D_DBTimeStamp      = new NativeDBType(0xff, 16,                 true,  false, OleDbType.DBTimeStamp,      NativeDBType.DBTIMESTAMP, S_DBTIMESTAMP,   typeof(System.DateTime), NativeDBType.DBTIMESTAMP, DbType.DateTime  ); //  8 - (tagDBTIMESTAMP)
        static private readonly NativeDBType D_Decimal          = new NativeDBType(  28, 16,                 true,  false, OleDbType.Decimal,          NativeDBType.DECIMAL,     S_DECIMAL,       typeof(System.Decimal),  NativeDBType.DECIMAL,     DbType.Decimal   ); //  9 - (tagDec) // MDAC 68447 
        static private readonly NativeDBType D_Error            = new NativeDBType(0xff,  4,                 true,  false, OleDbType.Error,            NativeDBType.ERROR,       S_ERROR,         typeof(System.Int32),    NativeDBType.ERROR,       DbType.Int32     ); // 10 - integer4
        static private readonly NativeDBType D_Filetime         = new NativeDBType(0xff,  8,                 true,  false, OleDbType.Filetime,         NativeDBType.FILETIME,    S_FILETIME,      typeof(System.DateTime), NativeDBType.FILETIME,    DbType.DateTime  ); // 11 - integer8 // MDAC 59504 
        static private readonly NativeDBType D_Guid             = new NativeDBType(0xff, 16,                 true,  false, OleDbType.Guid,             NativeDBType.GUID,        S_GUID,          typeof(System.Guid),     NativeDBType.GUID,        DbType.Guid      ); // 12 - ubyte[16] 
        static private readonly NativeDBType D_TinyInt          = new NativeDBType(   3,  1,                 true,  false, OleDbType.TinyInt,          NativeDBType.I1,          S_I1,            typeof(System.Int16),    NativeDBType.I1,          DbType.SByte     ); // 13 - integer1 // MDAC 59492
        static private readonly NativeDBType D_SmallInt         = new NativeDBType(   5,  2,                 true,  false, OleDbType.SmallInt,         NativeDBType.I2,          S_I2,            typeof(System.Int16),    NativeDBType.I2,          DbType.Int16     ); // 14 - integer2 
        static private readonly NativeDBType D_Integer          = new NativeDBType(  10,  4,                 true,  false, OleDbType.Integer,          NativeDBType.I4,          S_I4,            typeof(System.Int32),    NativeDBType.I4,          DbType.Int32     ); // 15 - integer4
        static private readonly NativeDBType D_BigInt           = new NativeDBType(  19,  8,                 true,  false, OleDbType.BigInt,           NativeDBType.I8,          S_I8,            typeof(System.Int64),    NativeDBType.I8,          DbType.Int64     ); // 16 - integer8
        static private readonly NativeDBType D_IDispatch        = new NativeDBType(0xff, ADP.PtrSize,        true,  false, OleDbType.IDispatch,        NativeDBType.IDISPATCH,   S_IDISPATCH,     typeof(System.Object),   NativeDBType.IDISPATCH,   DbType.Object    ); // 17 - integer4 (pointer)
        static private readonly NativeDBType D_IUnknown         = new NativeDBType(0xff, ADP.PtrSize,        true,  false, OleDbType.IUnknown,         NativeDBType.IUNKNOWN,    S_IUNKNOWN,      typeof(System.Object),   NativeDBType.IUNKNOWN,    DbType.Object    ); // 18 - integer4 (pointer) // MDAC 64040 
        static private readonly NativeDBType D_LongVarBinary    = new NativeDBType(0xff, -1,                 false, true,  OleDbType.LongVarBinary,    NativeDBType.BYTES,       S_LONGVARBINARY, typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); // 19
        static private readonly NativeDBType D_LongVarChar      = new NativeDBType(0xff, -1,                 false, true,  OleDbType.LongVarChar,      NativeDBType.STR,         S_LONGVARCHAR,   typeof(System.String),   NativeDBType.WSTR/*STR*/, DbType.AnsiString); // 20 - (ansi pointer) 
        static private readonly NativeDBType D_Numeric          = new NativeDBType(  28, 19,                 true,  false, OleDbType.Numeric,          NativeDBType.NUMERIC,     S_NUMERIC,       typeof(System.Decimal),  NativeDBType.NUMERIC,     DbType.Decimal   ); // 21 - (tagDB_Numeric) 
        static private readonly NativeDBType D_PropVariant      = new NativeDBType(0xff, NativeOledbWrapper.SizeOfPROPVARIANT,
                                                                                                             true,  false, OleDbType.PropVariant,      NativeDBType.PROPVARIANT, S_PROPVARIANT,   typeof(System.Object),   NativeDBType.VARIANT,     DbType.Object    ); // 22 
        static private readonly NativeDBType D_Single           = new NativeDBType(   7,  4,                 true,  false, OleDbType.Single,           NativeDBType.R4,          S_R4,            typeof(System.Single),   NativeDBType.R4,          DbType.Single    ); // 23 - single
        static private readonly NativeDBType D_Double           = new NativeDBType(  15,  8,                 true,  false, OleDbType.Double,           NativeDBType.R8,          S_R8,            typeof(System.Double),   NativeDBType.R8,          DbType.Double    ); // 24 - double
        static private readonly NativeDBType D_UnsignedTinyInt  = new NativeDBType(   3,  1,                 true,  false, OleDbType.UnsignedTinyInt,  NativeDBType.UI1,         S_UI1,           typeof(System.Byte),     NativeDBType.UI1,         DbType.Byte      ); // 25 - byte7
        static private readonly NativeDBType D_UnsignedSmallInt = new NativeDBType(   5,  2,                 true,  false, OleDbType.UnsignedSmallInt, NativeDBType.UI2,         S_UI2,           typeof(System.Int32),    NativeDBType.UI2,         DbType.UInt16    ); // 26 - unsigned integer2 
        static private readonly NativeDBType D_UnsignedInt      = new NativeDBType(  10,  4,                 true,  false, OleDbType.UnsignedInt,      NativeDBType.UI4,         S_UI4,           typeof(System.Int64),    NativeDBType.UI4,         DbType.UInt32    ); // 27 - unsigned integer4
        static private readonly NativeDBType D_UnsignedBigInt   = new NativeDBType(  20,  8,                 true,  false, OleDbType.UnsignedBigInt,   NativeDBType.UI8,         S_UI8,           typeof(System.Decimal),  NativeDBType.UI8,         DbType.UInt64    ); // 28 - unsigned integer8 
        static private readonly NativeDBType D_VarBinary        = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarBinary,        NativeDBType.BYTES,       S_VARBINARY,     typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); // 29 
        static private readonly NativeDBType D_VarChar          = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarChar,          NativeDBType.STR,         S_VARCHAR,       typeof(System.String),   NativeDBType.WSTR/*STR*/, DbType.AnsiString); // 30 - (ansi pointer)
        static private readonly NativeDBType D_Variant          = new NativeDBType(0xff, ODB.SizeOf_Variant, true,  false, OleDbType.Variant,          NativeDBType.VARIANT,     S_VARIANT,       typeof(System.Object),   NativeDBType.VARIANT,     DbType.Object    ); // 31 - ubyte[16] (variant) 
        static private readonly NativeDBType D_VarNumeric       = new NativeDBType( 255, 16,                 true,  false, OleDbType.VarNumeric,       NativeDBType.VARNUMERIC,  S_VARNUMERIC,    typeof(System.Decimal),  NativeDBType.DECIMAL,     DbType.VarNumeric); // 32 - (unicode pointer)
        static private readonly NativeDBType D_WChar            = new NativeDBType(0xff, -1,                 true,  false, OleDbType.WChar,            NativeDBType.WSTR,        S_WCHAR,         typeof(System.String),   NativeDBType.WSTR,        DbType.StringFixedLength); // 33 - (unicode pointer)
        static private readonly NativeDBType D_VarWChar         = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarWChar,         NativeDBType.WSTR,        S_WVARCHAR,      typeof(System.String),   NativeDBType.WSTR,        DbType.String    ); // 34 - (unicode pointer)
        static private readonly NativeDBType D_LongVarWChar     = new NativeDBType(0xff, -1,                 false, true,  OleDbType.LongVarWChar,     NativeDBType.WSTR,        S_WLONGVARCHAR,  typeof(System.String),   NativeDBType.WSTR,        DbType.String    ); // 35 - (unicode pointer) 
        static private readonly NativeDBType D_Chapter          = new NativeDBType(0xff, ADP.PtrSize,        false, false, OleDbType.Empty,            NativeDBType.HCHAPTER,    S_UDT,            typeof(IDataReader),     NativeDBType.HCHAPTER,    DbType.Object    ); // 36 - (hierarchical chaper)
        static private readonly NativeDBType D_Empty            = new NativeDBType(0xff,  0,                 false, false, OleDbType.Empty,            NativeDBType.EMPTY,       "",              null,                    NativeDBType.EMPTY,       DbType.Object    ); // 37 - invalid param default 
        static private readonly NativeDBType D_Xml              = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarWChar,         NativeDBType.XML,         S_XML,           typeof(System.String),   NativeDBType.WSTR,        DbType.String    ); // 38 - (unicode pointer) 
        static private readonly NativeDBType D_Udt              = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarBinary,        NativeDBType.UDT,         S_BINARY,        typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); // 39 - (unicode pointer)
 
        static internal readonly NativeDBType Default = D_VarWChar; // MDAC 65324
        static internal readonly Byte MaximumDecimalPrecision = D_Decimal.maxpre;

        private const int FixedDbPart = /*DBPART_VALUE*/0x1 | /*DBPART_STATUS*/0x4; 
        private const int VarblDbPart = /*DBPART_VALUE*/0x1 | /*DBPART_LENGTH*/0x2 | /*DBPART_STATUS*/0x4;
 
        internal readonly OleDbType enumOleDbType; // enum System.Data.OleDb.OleDbType 
        internal readonly DbType    enumDbType;    // enum System.Data.DbType
        internal readonly short     dbType;        // OLE DB DBTYPE_ 
        internal readonly short     wType;         // OLE DB DBTYPE_ we ask OleDB Provider to bind as
        internal readonly Type      dataType;      // CLR Type

        internal readonly int       dbPart;    // the DBPart w or w/out length 
        internal readonly bool      isfixed;   // IsFixedLength
        internal readonly bool      islong;    // IsLongLength 
        internal readonly Byte      maxpre;    // maxium precision for numeric types // $ 
        internal readonly int       fixlen;    // fixed length size in bytes (-1 for variable)
 
        internal readonly String    dataSourceType; // ICommandWithParameters.SetParameterInfo standard type name
        internal readonly StringMemHandle dbString;  // ptr to native allocated memory for dataSourceType string

        private NativeDBType(Byte maxpre, int fixlen, bool isfixed, bool islong, OleDbType enumOleDbType, short dbType, string dbstring, Type dataType, short wType, DbType enumDbType) { 
            this.enumOleDbType  = enumOleDbType;
            this.dbType    = dbType; 
            this.dbPart    = (-1 == fixlen) ? VarblDbPart : FixedDbPart; 
            this.isfixed   = isfixed;
            this.islong    = islong; 
            this.maxpre    = maxpre;
            this.fixlen    = fixlen;
            this.wType     = wType;
            this.dataSourceType = dbstring; 
            this.dbString  = new StringMemHandle(dbstring);
            this.dataType  = dataType; 
            this.enumDbType = enumDbType; 
        }
 
        internal bool IsVariableLength {
            get {
                return (-1 == fixlen);
            } 
        }
 
#if DEBUG 
        override public string ToString() {
            return enumOleDbType.ToString(); 
        }
#endif

        static internal NativeDBType FromDataType(OleDbType enumOleDbType) { 
            switch(enumOleDbType) { // @perfnote: Enum.IsDefined
            case OleDbType.Empty:            return D_Empty;            //   0 
            case OleDbType.SmallInt:         return D_SmallInt;         //   2 
            case OleDbType.Integer:          return D_Integer;          //   3
            case OleDbType.Single:           return D_Single;           //   4 
            case OleDbType.Double:           return D_Double;           //   5
            case OleDbType.Currency:         return D_Currency;         //   6
            case OleDbType.Date:             return D_Date;             //   7
            case OleDbType.BSTR:             return D_BSTR;             //   8 
            case OleDbType.IDispatch:        return D_IDispatch;        //   9
            case OleDbType.Error:            return D_Error;            //  10 
            case OleDbType.Boolean:          return D_Boolean;          //  11 
            case OleDbType.Variant:          return D_Variant;          //  12
            case OleDbType.IUnknown:         return D_IUnknown;         //  13 
            case OleDbType.Decimal:          return D_Decimal;          //  14
            case OleDbType.TinyInt:          return D_TinyInt;          //  16
            case OleDbType.UnsignedTinyInt:  return D_UnsignedTinyInt;  //  17
            case OleDbType.UnsignedSmallInt: return D_UnsignedSmallInt; //  18 
            case OleDbType.UnsignedInt:      return D_UnsignedInt;      //  19
            case OleDbType.BigInt:           return D_BigInt;           //  20 
            case OleDbType.UnsignedBigInt:   return D_UnsignedBigInt;   //  21 
            case OleDbType.Filetime:         return D_Filetime;         //  64
            case OleDbType.Guid:             return D_Guid;             //  72 
            case OleDbType.Binary:           return D_Binary;           // 128
            case OleDbType.Char:             return D_Char;             // 129
            case OleDbType.WChar:            return D_WChar;            // 130
            case OleDbType.Numeric:          return D_Numeric;          // 131 
            case OleDbType.DBDate:           return D_DBDate;           // 133
            case OleDbType.DBTime:           return D_DBTime;           // 134 
            case OleDbType.DBTimeStamp:      return D_DBTimeStamp;      // 135 
            case OleDbType.PropVariant:      return D_PropVariant;      // 138
            case OleDbType.VarNumeric:       return D_VarNumeric;       // 139 
            case OleDbType.VarChar:          return D_VarChar;          // 200
            case OleDbType.LongVarChar:      return D_LongVarChar;      // 201
            case OleDbType.VarWChar:         return D_VarWChar;         // 202 // MDAC 64983: ORA-12704: character set mismatch
            case OleDbType.LongVarWChar:     return D_LongVarWChar;     // 203 
            case OleDbType.VarBinary:        return D_VarBinary;        // 204
            case OleDbType.LongVarBinary:    return D_LongVarBinary;    // 205 
            default: 
                throw ODB.InvalidOleDbType(enumOleDbType);
            } 
        }

        static internal NativeDBType FromSystemType(object value) {
            IConvertible ic = (value as IConvertible); 
            if (null != ic) {
                switch(ic.GetTypeCode()) { 
                case TypeCode.Empty:     return NativeDBType.D_Empty; 
                case TypeCode.Object:    return NativeDBType.D_Variant;
                case TypeCode.DBNull:    throw ADP.InvalidDataType(TypeCode.DBNull); 
                case TypeCode.Boolean:   return NativeDBType.D_Boolean;
                case TypeCode.Char:      return NativeDBType.D_Char;
                case TypeCode.SByte:     return NativeDBType.D_TinyInt;
                case TypeCode.Byte:      return NativeDBType.D_UnsignedTinyInt; 
                case TypeCode.Int16:     return NativeDBType.D_SmallInt;
                case TypeCode.UInt16:    return NativeDBType.D_UnsignedSmallInt; 
                case TypeCode.Int32:     return NativeDBType.D_Integer; 
                case TypeCode.UInt32:    return NativeDBType.D_UnsignedInt;
                case TypeCode.Int64:     return NativeDBType.D_BigInt; 
                case TypeCode.UInt64:    return NativeDBType.D_UnsignedBigInt;
                case TypeCode.Single:    return NativeDBType.D_Single;
                case TypeCode.Double:    return NativeDBType.D_Double;
                case TypeCode.Decimal:   return NativeDBType.D_Decimal; 
                case TypeCode.DateTime:  return NativeDBType.D_DBTimeStamp;
                case TypeCode.String:    return NativeDBType.D_VarWChar; 
                default:                 throw ADP.UnknownDataTypeCode(value.GetType(), ic.GetTypeCode()); 
                }
            } 
            else if (value is System.Byte[]) {
                return NativeDBType.D_VarBinary;
            }
            else if (value is System.Guid) { 
                return NativeDBType.D_Guid;
            } 
            else if (value is System.TimeSpan) { 
                return NativeDBType.D_DBTime;
            } 
            else {
                return NativeDBType.D_Variant;
            }
            //throw ADP.UnknownDataType(value.GetType()); 
        }
 
        static internal NativeDBType FromDbType(DbType dbType) { 
            switch(dbType) {
            case DbType.AnsiString: return D_VarChar; 
            case DbType.AnsiStringFixedLength: return D_Char;
            case DbType.Binary:     return D_VarBinary;
            case DbType.Byte:       return D_UnsignedTinyInt;
            case DbType.Boolean:    return D_Boolean; 
            case DbType.Currency:   return D_Currency;
            case DbType.Date:       return D_DBDate; 
            case DbType.DateTime:   return D_DBTimeStamp; 
            case DbType.Decimal:    return D_Decimal;
            case DbType.Double:     return D_Double; 
            case DbType.Guid:       return D_Guid;
            case DbType.Int16:      return D_SmallInt;
            case DbType.Int32:      return D_Integer;
            case DbType.Int64:      return D_BigInt; 
            case DbType.Object:     return D_Variant;
            case DbType.SByte:      return D_TinyInt; 
            case DbType.Single:     return D_Single; 
            case DbType.String:     return D_VarWChar;
            case DbType.StringFixedLength: return D_WChar; 
            case DbType.Time:       return D_DBTime;
            case DbType.UInt16:     return D_UnsignedSmallInt;
            case DbType.UInt32:     return D_UnsignedInt;
            case DbType.UInt64:     return D_UnsignedBigInt; 
            case DbType.VarNumeric: return D_VarNumeric;
            case DbType.Xml:        return D_Xml; 
            default: 
                throw ADP.DbTypeNotSupported(dbType, typeof(OleDbType)); // MDAC 66009
            } 
        }

        static internal NativeDBType FromDBType(short dbType, bool isLong, bool isFixed) {
            switch(dbType) { 
          //case EMPTY:
          //case NULL: 
            case I2:            return D_SmallInt; 
            case I4:            return D_Integer;
            case R4:            return D_Single; 
            case R8:            return D_Double;
            case CY:            return D_Currency;
            case DATE:          return D_Date;
            case BSTR:          return D_BSTR; 
            case IDISPATCH:     return D_IDispatch;
            case ERROR:         return D_Error; 
            case BOOL:          return D_Boolean; 
            case VARIANT:       return D_Variant;
            case IUNKNOWN:      return D_IUnknown; 
            case DECIMAL:       return D_Decimal;
            case I1:            return D_TinyInt;
            case UI1:           return D_UnsignedTinyInt;
            case UI2:           return D_UnsignedSmallInt; 
            case UI4:           return D_UnsignedInt;
            case I8:            return D_BigInt; 
            case UI8:           return D_UnsignedBigInt; 
            case FILETIME:      return D_Filetime;
            case GUID:          return D_Guid; 
            case BYTES:         return (isLong) ? D_LongVarBinary : (isFixed) ? D_Binary : D_VarBinary;
            case STR:           return (isLong) ? D_LongVarChar : (isFixed) ? D_Char : D_VarChar;
            case WSTR:          return (isLong) ? D_LongVarWChar : (isFixed) ? D_WChar : D_VarWChar;
            case NUMERIC:       return D_Numeric; 
          //case UDT:
            case DBDATE:        return D_DBDate; 
            case DBTIME:        return D_DBTime; 
            case DBTIMESTAMP:   return D_DBTimeStamp;
            case HCHAPTER:      return D_Chapter; 
            case PROPVARIANT:   return D_PropVariant;
            case VARNUMERIC:    return D_VarNumeric;
            case XML:           return D_Xml;
            case UDT:           return D_Udt; 
          //case VECTOR:
          //case ARRAY: 
          //case BYREF: 
          //case RESERVED:
            default: 
                if (0 != (NativeDBType.VECTOR & dbType)) {
                    throw ODB.DBBindingGetVector();
                }
                return D_Variant; // MDAC 72067 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.OleDb {
 
    using System;
    using System.ComponentModel;
    using System.Data.Common;
    using System.Diagnostics; 
    using System.Globalization;
    using System.Runtime.InteropServices; 
 
    internal enum DBStatus { // from 4214.0
        S_OK                 = 0, 
        E_BADACCESSOR        = 1,
        E_CANTCONVERTVALUE   = 2,
        S_ISNULL             = 3,
        S_TRUNCATED          = 4, 
        E_SIGNMISMATCH       = 5,
        E_DATAOVERFLOW       = 6, 
        E_CANTCREATE         = 7, 
        E_UNAVAILABLE        = 8,
        E_PERMISSIONDENIED   = 9, 
        E_INTEGRITYVIOLATION = 10,
        E_SCHEMAVIOLATION    = 11,
        E_BADSTATUS          = 12,
        S_DEFAULT            = 13, 
        S_CELLEMPTY          = 14, // 2.0
        S_IGNORE             = 15, // 2.0 
        E_DOESNOTEXIST       = 16, // 2.1 
        E_INVALIDURL         = 17, // 2.1
        E_RESOURCELOCKED     = 18, // 2.1 
        E_RESOURCEEXISTS     = 19, // 2.1
        E_CANNOTCOMPLETE     = 20, // 2.1
        E_VOLUMENOTFOUND     = 21, // 2.1
        E_OUTOFSPACE         = 22, // 2.1 
        S_CANNOTDELETESOURCE = 23, // 2.1
        E_READONLY           = 24, // 2.1 
        E_RESOURCEOUTOFSCOPE = 25, // 2.1 
        S_ALREADYEXISTS      = 26, // 2.1
        E_CANCELED           = 27, // 2.5 
        E_NOTCOLLECTION      = 28, // 2.5
        S_ROWSETCOLUMN       = 29, // 2.6
    }
 
    sealed internal class NativeDBType { // from 4214.0
        // Variant compatible 
        internal const short EMPTY         = 0;       // 
        internal const short NULL          = 1;       //
        internal const short I2            = 2;       // 
        internal const short I4            = 3;       //
        internal const short R4            = 4;       //
        internal const short R8            = 5;       //
        internal const short CY            = 6;       // 
        internal const short DATE          = 7;       //
        internal const short BSTR          = 8;       // 
        internal const short IDISPATCH     = 9;       // 
        internal const short ERROR         = 10;      //
        internal const short BOOL          = 11;      // 
        internal const short VARIANT       = 12;      //
        internal const short IUNKNOWN      = 13;      //
        internal const short DECIMAL       = 14;      //
        internal const short I1            = 16;      // 
        internal const short UI1           = 17;      //
        internal const short UI2           = 18;      // 
        internal const short UI4           = 19;      // 
        internal const short I8            = 20;      //
        internal const short UI8           = 21;      // 
        internal const short FILETIME      = 64;      // 2.0
        internal const short DBUTCDATETIME = 65;      // 9.0
        internal const short DBTIME_EX     = 66;      // 9.0
        internal const short GUID          = 72;      // 
        internal const short BYTES         = 128;     //
        internal const short STR           = 129;     // 
        internal const short WSTR          = 130;     // 
        internal const short NUMERIC       = 131;     // with potential overflow
        internal const short UDT           = 132;     // should never be encountered 
        internal const short DBDATE        = 133;     //
        internal const short DBTIME        = 134;     //
        internal const short DBTIMESTAMP   = 135;     // granularity reduced from 1ns to 100ns (sql is 3.33 milli seconds)
        internal const short HCHAPTER      = 136;     // 1.5 
        internal const short PROPVARIANT   = 138;     // 2.0 - as variant
        internal const short VARNUMERIC    = 139;     // 2.0 - as string else ConversionException 
        internal const short XML           = 141;     // 9.0 
        internal const short VECTOR        = unchecked((short)0x1000);
        internal const short ARRAY         = unchecked((short)0x2000); 
        internal const short BYREF         = unchecked((short)0x4000);  //
        internal const short RESERVED      = unchecked((short)0x8000);  // SystemException

        // high mask 
        internal const short HighMask  = unchecked((short)0xf000);
 
        static internal bool HasHighBit(short value) { 
            return (0 != (HighMask & value));
        } 
        /*
        static internal bool IsArray(short value) {
            return (ARRAY == (HighMask & value));
        } 
        static internal bool IsByRef(short value) {
            return (BYREF == (HighMask & value)); 
        } 
        static internal bool IsReserved(short value) {
            return (RESERVED == (HighMask & value)); 
        }
        static internal bool IsVector(short value) {
            return (VECTOR == (HighMask & value));
        } 
        static internal int GetLowBits(short value) {
            return (value & ~HighMask); 
        } 
        */
 
        private const string S_BINARY        = "DBTYPE_BINARY"; // DBTYPE_BYTES
        private const string S_BOOL          = "DBTYPE_BOOL";
        private const string S_BSTR          = "DBTYPE_BSTR";
        private const string S_CHAR          = "DBTYPE_CHAR";  // DBTYPE_STR 
        private const string S_CY            = "DBTYPE_CY";
        private const string S_DATE          = "DBTYPE_DATE"; 
        private const string S_DBDATE        = "DBTYPE_DBDATE"; 
        private const string S_DBTIME        = "DBTYPE_DBTIME";
        private const string S_DBTIMESTAMP   = "DBTYPE_DBTIMESTAMP"; 
        private const string S_DECIMAL       = "DBTYPE_DECIMAL";
        private const string S_ERROR         = "DBTYPE_ERROR";
        private const string S_FILETIME      = "DBTYPE_FILETIME";
        private const string S_GUID          = "DBTYPE_GUID"; 
        private const string S_I1            = "DBTYPE_I1";
        private const string S_I2            = "DBTYPE_I2"; 
        private const string S_I4            = "DBTYPE_I4"; 
        private const string S_I8            = "DBTYPE_I8";
        private const string S_IDISPATCH     = "DBTYPE_IDISPATCH"; 
        private const string S_IUNKNOWN      = "DBTYPE_IUNKNOWN";
        private const string S_LONGVARBINARY = "DBTYPE_LONGVARBINARY"; // DBTYPE_BYTES
        private const string S_LONGVARCHAR   = "DBTYPE_LONGVARCHAR"; // DBTYPE_STR
        private const string S_NUMERIC       = "DBTYPE_NUMERIC"; 
        private const string S_PROPVARIANT   = "DBTYPE_PROPVARIANT";
        private const string S_R4            = "DBTYPE_R4"; 
        private const string S_R8            = "DBTYPE_R8"; 
        private const string S_UDT           = "DBTYPE_UDT";
        private const string S_UI1           = "DBTYPE_UI1"; 
        private const string S_UI2           = "DBTYPE_UI2";
        private const string S_UI4           = "DBTYPE_UI4";
        private const string S_UI8           = "DBTYPE_UI8";
        private const string S_VARBINARY     = "DBTYPE_VARBINARY"; // DBTYPE_BYTES 
        private const string S_VARCHAR       = "DBTYPE_VARCHAR"; // DBTYPE_STR
        private const string S_VARIANT       = "DBTYPE_VARIANT"; 
        private const string S_VARNUMERIC    = "DBTYPE_VARNUMERIC"; 
        private const string S_WCHAR         = "DBTYPE_WCHAR"; // DBTYPE_WSTR
        private const string S_WVARCHAR      = "DBTYPE_WVARCHAR"; // DBTYPE_WSTR 
        private const string S_WLONGVARCHAR  = "DBTYPE_WLONGVARCHAR"; // DBTYPE_WSTR
        private const string S_XML           = "DBTYPE_XML";

        static private readonly NativeDBType D_Binary           = new NativeDBType(0xff, -1,                 true,  false, OleDbType.Binary,           NativeDBType.BYTES,       S_BINARY,        typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); //  0 
        static private readonly NativeDBType D_Boolean          = new NativeDBType(0xff,  2,                 true,  false, OleDbType.Boolean,          NativeDBType.BOOL,        S_BOOL,          typeof(System.Boolean),  NativeDBType.BOOL,        DbType.Boolean   ); //  1 - integer2 (variant_bool)
        static private readonly NativeDBType D_BSTR             = new NativeDBType(0xff, ADP.PtrSize,        false, false, OleDbType.BSTR,             NativeDBType.BSTR,        S_BSTR,          typeof(System.String),   NativeDBType.BSTR,        DbType.String    ); //  2 - integer4 (pointer) 
        static private readonly NativeDBType D_Char             = new NativeDBType(0xff, -1,                 true,  false, OleDbType.Char,             NativeDBType.STR,         S_CHAR,          typeof(System.String),   NativeDBType.WSTR/*STR*/, DbType.AnsiStringFixedLength); //  3 - (ansi pointer) 
        static private readonly NativeDBType D_Currency         = new NativeDBType(  19,  8,                 true,  false, OleDbType.Currency,         NativeDBType.CY,          S_CY,            typeof(System.Decimal),  NativeDBType.CY,          DbType.Currency  ); //  4 - integer8
        static private readonly NativeDBType D_Date             = new NativeDBType(0xff,  8,                 true,  false, OleDbType.Date,             NativeDBType.DATE,        S_DATE,          typeof(System.DateTime), NativeDBType.DATE,        DbType.DateTime  ); //  5 - double 
        static private readonly NativeDBType D_DBDate           = new NativeDBType(0xff,  6,                 true,  false, OleDbType.DBDate,           NativeDBType.DBDATE,      S_DBDATE,        typeof(System.DateTime), NativeDBType.DBDATE,      DbType.Date      ); //  6 - (tagDBDate)
        static private readonly NativeDBType D_DBTime           = new NativeDBType(0xff,  6,                 true,  false, OleDbType.DBTime,           NativeDBType.DBTIME,      S_DBTIME,        typeof(System.TimeSpan), NativeDBType.DBTIME,      DbType.Time      ); //  7 - (tagDBTime)
        static private readonly NativeDBType D_DBTimeStamp      = new NativeDBType(0xff, 16,                 true,  false, OleDbType.DBTimeStamp,      NativeDBType.DBTIMESTAMP, S_DBTIMESTAMP,   typeof(System.DateTime), NativeDBType.DBTIMESTAMP, DbType.DateTime  ); //  8 - (tagDBTIMESTAMP)
        static private readonly NativeDBType D_Decimal          = new NativeDBType(  28, 16,                 true,  false, OleDbType.Decimal,          NativeDBType.DECIMAL,     S_DECIMAL,       typeof(System.Decimal),  NativeDBType.DECIMAL,     DbType.Decimal   ); //  9 - (tagDec) // MDAC 68447 
        static private readonly NativeDBType D_Error            = new NativeDBType(0xff,  4,                 true,  false, OleDbType.Error,            NativeDBType.ERROR,       S_ERROR,         typeof(System.Int32),    NativeDBType.ERROR,       DbType.Int32     ); // 10 - integer4
        static private readonly NativeDBType D_Filetime         = new NativeDBType(0xff,  8,                 true,  false, OleDbType.Filetime,         NativeDBType.FILETIME,    S_FILETIME,      typeof(System.DateTime), NativeDBType.FILETIME,    DbType.DateTime  ); // 11 - integer8 // MDAC 59504 
        static private readonly NativeDBType D_Guid             = new NativeDBType(0xff, 16,                 true,  false, OleDbType.Guid,             NativeDBType.GUID,        S_GUID,          typeof(System.Guid),     NativeDBType.GUID,        DbType.Guid      ); // 12 - ubyte[16] 
        static private readonly NativeDBType D_TinyInt          = new NativeDBType(   3,  1,                 true,  false, OleDbType.TinyInt,          NativeDBType.I1,          S_I1,            typeof(System.Int16),    NativeDBType.I1,          DbType.SByte     ); // 13 - integer1 // MDAC 59492
        static private readonly NativeDBType D_SmallInt         = new NativeDBType(   5,  2,                 true,  false, OleDbType.SmallInt,         NativeDBType.I2,          S_I2,            typeof(System.Int16),    NativeDBType.I2,          DbType.Int16     ); // 14 - integer2 
        static private readonly NativeDBType D_Integer          = new NativeDBType(  10,  4,                 true,  false, OleDbType.Integer,          NativeDBType.I4,          S_I4,            typeof(System.Int32),    NativeDBType.I4,          DbType.Int32     ); // 15 - integer4
        static private readonly NativeDBType D_BigInt           = new NativeDBType(  19,  8,                 true,  false, OleDbType.BigInt,           NativeDBType.I8,          S_I8,            typeof(System.Int64),    NativeDBType.I8,          DbType.Int64     ); // 16 - integer8
        static private readonly NativeDBType D_IDispatch        = new NativeDBType(0xff, ADP.PtrSize,        true,  false, OleDbType.IDispatch,        NativeDBType.IDISPATCH,   S_IDISPATCH,     typeof(System.Object),   NativeDBType.IDISPATCH,   DbType.Object    ); // 17 - integer4 (pointer)
        static private readonly NativeDBType D_IUnknown         = new NativeDBType(0xff, ADP.PtrSize,        true,  false, OleDbType.IUnknown,         NativeDBType.IUNKNOWN,    S_IUNKNOWN,      typeof(System.Object),   NativeDBType.IUNKNOWN,    DbType.Object    ); // 18 - integer4 (pointer) // MDAC 64040 
        static private readonly NativeDBType D_LongVarBinary    = new NativeDBType(0xff, -1,                 false, true,  OleDbType.LongVarBinary,    NativeDBType.BYTES,       S_LONGVARBINARY, typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); // 19
        static private readonly NativeDBType D_LongVarChar      = new NativeDBType(0xff, -1,                 false, true,  OleDbType.LongVarChar,      NativeDBType.STR,         S_LONGVARCHAR,   typeof(System.String),   NativeDBType.WSTR/*STR*/, DbType.AnsiString); // 20 - (ansi pointer) 
        static private readonly NativeDBType D_Numeric          = new NativeDBType(  28, 19,                 true,  false, OleDbType.Numeric,          NativeDBType.NUMERIC,     S_NUMERIC,       typeof(System.Decimal),  NativeDBType.NUMERIC,     DbType.Decimal   ); // 21 - (tagDB_Numeric) 
        static private readonly NativeDBType D_PropVariant      = new NativeDBType(0xff, NativeOledbWrapper.SizeOfPROPVARIANT,
                                                                                                             true,  false, OleDbType.PropVariant,      NativeDBType.PROPVARIANT, S_PROPVARIANT,   typeof(System.Object),   NativeDBType.VARIANT,     DbType.Object    ); // 22 
        static private readonly NativeDBType D_Single           = new NativeDBType(   7,  4,                 true,  false, OleDbType.Single,           NativeDBType.R4,          S_R4,            typeof(System.Single),   NativeDBType.R4,          DbType.Single    ); // 23 - single
        static private readonly NativeDBType D_Double           = new NativeDBType(  15,  8,                 true,  false, OleDbType.Double,           NativeDBType.R8,          S_R8,            typeof(System.Double),   NativeDBType.R8,          DbType.Double    ); // 24 - double
        static private readonly NativeDBType D_UnsignedTinyInt  = new NativeDBType(   3,  1,                 true,  false, OleDbType.UnsignedTinyInt,  NativeDBType.UI1,         S_UI1,           typeof(System.Byte),     NativeDBType.UI1,         DbType.Byte      ); // 25 - byte7
        static private readonly NativeDBType D_UnsignedSmallInt = new NativeDBType(   5,  2,                 true,  false, OleDbType.UnsignedSmallInt, NativeDBType.UI2,         S_UI2,           typeof(System.Int32),    NativeDBType.UI2,         DbType.UInt16    ); // 26 - unsigned integer2 
        static private readonly NativeDBType D_UnsignedInt      = new NativeDBType(  10,  4,                 true,  false, OleDbType.UnsignedInt,      NativeDBType.UI4,         S_UI4,           typeof(System.Int64),    NativeDBType.UI4,         DbType.UInt32    ); // 27 - unsigned integer4
        static private readonly NativeDBType D_UnsignedBigInt   = new NativeDBType(  20,  8,                 true,  false, OleDbType.UnsignedBigInt,   NativeDBType.UI8,         S_UI8,           typeof(System.Decimal),  NativeDBType.UI8,         DbType.UInt64    ); // 28 - unsigned integer8 
        static private readonly NativeDBType D_VarBinary        = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarBinary,        NativeDBType.BYTES,       S_VARBINARY,     typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); // 29 
        static private readonly NativeDBType D_VarChar          = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarChar,          NativeDBType.STR,         S_VARCHAR,       typeof(System.String),   NativeDBType.WSTR/*STR*/, DbType.AnsiString); // 30 - (ansi pointer)
        static private readonly NativeDBType D_Variant          = new NativeDBType(0xff, ODB.SizeOf_Variant, true,  false, OleDbType.Variant,          NativeDBType.VARIANT,     S_VARIANT,       typeof(System.Object),   NativeDBType.VARIANT,     DbType.Object    ); // 31 - ubyte[16] (variant) 
        static private readonly NativeDBType D_VarNumeric       = new NativeDBType( 255, 16,                 true,  false, OleDbType.VarNumeric,       NativeDBType.VARNUMERIC,  S_VARNUMERIC,    typeof(System.Decimal),  NativeDBType.DECIMAL,     DbType.VarNumeric); // 32 - (unicode pointer)
        static private readonly NativeDBType D_WChar            = new NativeDBType(0xff, -1,                 true,  false, OleDbType.WChar,            NativeDBType.WSTR,        S_WCHAR,         typeof(System.String),   NativeDBType.WSTR,        DbType.StringFixedLength); // 33 - (unicode pointer)
        static private readonly NativeDBType D_VarWChar         = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarWChar,         NativeDBType.WSTR,        S_WVARCHAR,      typeof(System.String),   NativeDBType.WSTR,        DbType.String    ); // 34 - (unicode pointer)
        static private readonly NativeDBType D_LongVarWChar     = new NativeDBType(0xff, -1,                 false, true,  OleDbType.LongVarWChar,     NativeDBType.WSTR,        S_WLONGVARCHAR,  typeof(System.String),   NativeDBType.WSTR,        DbType.String    ); // 35 - (unicode pointer) 
        static private readonly NativeDBType D_Chapter          = new NativeDBType(0xff, ADP.PtrSize,        false, false, OleDbType.Empty,            NativeDBType.HCHAPTER,    S_UDT,            typeof(IDataReader),     NativeDBType.HCHAPTER,    DbType.Object    ); // 36 - (hierarchical chaper)
        static private readonly NativeDBType D_Empty            = new NativeDBType(0xff,  0,                 false, false, OleDbType.Empty,            NativeDBType.EMPTY,       "",              null,                    NativeDBType.EMPTY,       DbType.Object    ); // 37 - invalid param default 
        static private readonly NativeDBType D_Xml              = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarWChar,         NativeDBType.XML,         S_XML,           typeof(System.String),   NativeDBType.WSTR,        DbType.String    ); // 38 - (unicode pointer) 
        static private readonly NativeDBType D_Udt              = new NativeDBType(0xff, -1,                 false, false, OleDbType.VarBinary,        NativeDBType.UDT,         S_BINARY,        typeof(System.Byte[]),   NativeDBType.BYTES,       DbType.Binary    ); // 39 - (unicode pointer)
 
        static internal readonly NativeDBType Default = D_VarWChar; // MDAC 65324
        static internal readonly Byte MaximumDecimalPrecision = D_Decimal.maxpre;

        private const int FixedDbPart = /*DBPART_VALUE*/0x1 | /*DBPART_STATUS*/0x4; 
        private const int VarblDbPart = /*DBPART_VALUE*/0x1 | /*DBPART_LENGTH*/0x2 | /*DBPART_STATUS*/0x4;
 
        internal readonly OleDbType enumOleDbType; // enum System.Data.OleDb.OleDbType 
        internal readonly DbType    enumDbType;    // enum System.Data.DbType
        internal readonly short     dbType;        // OLE DB DBTYPE_ 
        internal readonly short     wType;         // OLE DB DBTYPE_ we ask OleDB Provider to bind as
        internal readonly Type      dataType;      // CLR Type

        internal readonly int       dbPart;    // the DBPart w or w/out length 
        internal readonly bool      isfixed;   // IsFixedLength
        internal readonly bool      islong;    // IsLongLength 
        internal readonly Byte      maxpre;    // maxium precision for numeric types // $ 
        internal readonly int       fixlen;    // fixed length size in bytes (-1 for variable)
 
        internal readonly String    dataSourceType; // ICommandWithParameters.SetParameterInfo standard type name
        internal readonly StringMemHandle dbString;  // ptr to native allocated memory for dataSourceType string

        private NativeDBType(Byte maxpre, int fixlen, bool isfixed, bool islong, OleDbType enumOleDbType, short dbType, string dbstring, Type dataType, short wType, DbType enumDbType) { 
            this.enumOleDbType  = enumOleDbType;
            this.dbType    = dbType; 
            this.dbPart    = (-1 == fixlen) ? VarblDbPart : FixedDbPart; 
            this.isfixed   = isfixed;
            this.islong    = islong; 
            this.maxpre    = maxpre;
            this.fixlen    = fixlen;
            this.wType     = wType;
            this.dataSourceType = dbstring; 
            this.dbString  = new StringMemHandle(dbstring);
            this.dataType  = dataType; 
            this.enumDbType = enumDbType; 
        }
 
        internal bool IsVariableLength {
            get {
                return (-1 == fixlen);
            } 
        }
 
#if DEBUG 
        override public string ToString() {
            return enumOleDbType.ToString(); 
        }
#endif

        static internal NativeDBType FromDataType(OleDbType enumOleDbType) { 
            switch(enumOleDbType) { // @perfnote: Enum.IsDefined
            case OleDbType.Empty:            return D_Empty;            //   0 
            case OleDbType.SmallInt:         return D_SmallInt;         //   2 
            case OleDbType.Integer:          return D_Integer;          //   3
            case OleDbType.Single:           return D_Single;           //   4 
            case OleDbType.Double:           return D_Double;           //   5
            case OleDbType.Currency:         return D_Currency;         //   6
            case OleDbType.Date:             return D_Date;             //   7
            case OleDbType.BSTR:             return D_BSTR;             //   8 
            case OleDbType.IDispatch:        return D_IDispatch;        //   9
            case OleDbType.Error:            return D_Error;            //  10 
            case OleDbType.Boolean:          return D_Boolean;          //  11 
            case OleDbType.Variant:          return D_Variant;          //  12
            case OleDbType.IUnknown:         return D_IUnknown;         //  13 
            case OleDbType.Decimal:          return D_Decimal;          //  14
            case OleDbType.TinyInt:          return D_TinyInt;          //  16
            case OleDbType.UnsignedTinyInt:  return D_UnsignedTinyInt;  //  17
            case OleDbType.UnsignedSmallInt: return D_UnsignedSmallInt; //  18 
            case OleDbType.UnsignedInt:      return D_UnsignedInt;      //  19
            case OleDbType.BigInt:           return D_BigInt;           //  20 
            case OleDbType.UnsignedBigInt:   return D_UnsignedBigInt;   //  21 
            case OleDbType.Filetime:         return D_Filetime;         //  64
            case OleDbType.Guid:             return D_Guid;             //  72 
            case OleDbType.Binary:           return D_Binary;           // 128
            case OleDbType.Char:             return D_Char;             // 129
            case OleDbType.WChar:            return D_WChar;            // 130
            case OleDbType.Numeric:          return D_Numeric;          // 131 
            case OleDbType.DBDate:           return D_DBDate;           // 133
            case OleDbType.DBTime:           return D_DBTime;           // 134 
            case OleDbType.DBTimeStamp:      return D_DBTimeStamp;      // 135 
            case OleDbType.PropVariant:      return D_PropVariant;      // 138
            case OleDbType.VarNumeric:       return D_VarNumeric;       // 139 
            case OleDbType.VarChar:          return D_VarChar;          // 200
            case OleDbType.LongVarChar:      return D_LongVarChar;      // 201
            case OleDbType.VarWChar:         return D_VarWChar;         // 202 // MDAC 64983: ORA-12704: character set mismatch
            case OleDbType.LongVarWChar:     return D_LongVarWChar;     // 203 
            case OleDbType.VarBinary:        return D_VarBinary;        // 204
            case OleDbType.LongVarBinary:    return D_LongVarBinary;    // 205 
            default: 
                throw ODB.InvalidOleDbType(enumOleDbType);
            } 
        }

        static internal NativeDBType FromSystemType(object value) {
            IConvertible ic = (value as IConvertible); 
            if (null != ic) {
                switch(ic.GetTypeCode()) { 
                case TypeCode.Empty:     return NativeDBType.D_Empty; 
                case TypeCode.Object:    return NativeDBType.D_Variant;
                case TypeCode.DBNull:    throw ADP.InvalidDataType(TypeCode.DBNull); 
                case TypeCode.Boolean:   return NativeDBType.D_Boolean;
                case TypeCode.Char:      return NativeDBType.D_Char;
                case TypeCode.SByte:     return NativeDBType.D_TinyInt;
                case TypeCode.Byte:      return NativeDBType.D_UnsignedTinyInt; 
                case TypeCode.Int16:     return NativeDBType.D_SmallInt;
                case TypeCode.UInt16:    return NativeDBType.D_UnsignedSmallInt; 
                case TypeCode.Int32:     return NativeDBType.D_Integer; 
                case TypeCode.UInt32:    return NativeDBType.D_UnsignedInt;
                case TypeCode.Int64:     return NativeDBType.D_BigInt; 
                case TypeCode.UInt64:    return NativeDBType.D_UnsignedBigInt;
                case TypeCode.Single:    return NativeDBType.D_Single;
                case TypeCode.Double:    return NativeDBType.D_Double;
                case TypeCode.Decimal:   return NativeDBType.D_Decimal; 
                case TypeCode.DateTime:  return NativeDBType.D_DBTimeStamp;
                case TypeCode.String:    return NativeDBType.D_VarWChar; 
                default:                 throw ADP.UnknownDataTypeCode(value.GetType(), ic.GetTypeCode()); 
                }
            } 
            else if (value is System.Byte[]) {
                return NativeDBType.D_VarBinary;
            }
            else if (value is System.Guid) { 
                return NativeDBType.D_Guid;
            } 
            else if (value is System.TimeSpan) { 
                return NativeDBType.D_DBTime;
            } 
            else {
                return NativeDBType.D_Variant;
            }
            //throw ADP.UnknownDataType(value.GetType()); 
        }
 
        static internal NativeDBType FromDbType(DbType dbType) { 
            switch(dbType) {
            case DbType.AnsiString: return D_VarChar; 
            case DbType.AnsiStringFixedLength: return D_Char;
            case DbType.Binary:     return D_VarBinary;
            case DbType.Byte:       return D_UnsignedTinyInt;
            case DbType.Boolean:    return D_Boolean; 
            case DbType.Currency:   return D_Currency;
            case DbType.Date:       return D_DBDate; 
            case DbType.DateTime:   return D_DBTimeStamp; 
            case DbType.Decimal:    return D_Decimal;
            case DbType.Double:     return D_Double; 
            case DbType.Guid:       return D_Guid;
            case DbType.Int16:      return D_SmallInt;
            case DbType.Int32:      return D_Integer;
            case DbType.Int64:      return D_BigInt; 
            case DbType.Object:     return D_Variant;
            case DbType.SByte:      return D_TinyInt; 
            case DbType.Single:     return D_Single; 
            case DbType.String:     return D_VarWChar;
            case DbType.StringFixedLength: return D_WChar; 
            case DbType.Time:       return D_DBTime;
            case DbType.UInt16:     return D_UnsignedSmallInt;
            case DbType.UInt32:     return D_UnsignedInt;
            case DbType.UInt64:     return D_UnsignedBigInt; 
            case DbType.VarNumeric: return D_VarNumeric;
            case DbType.Xml:        return D_Xml; 
            default: 
                throw ADP.DbTypeNotSupported(dbType, typeof(OleDbType)); // MDAC 66009
            } 
        }

        static internal NativeDBType FromDBType(short dbType, bool isLong, bool isFixed) {
            switch(dbType) { 
          //case EMPTY:
          //case NULL: 
            case I2:            return D_SmallInt; 
            case I4:            return D_Integer;
            case R4:            return D_Single; 
            case R8:            return D_Double;
            case CY:            return D_Currency;
            case DATE:          return D_Date;
            case BSTR:          return D_BSTR; 
            case IDISPATCH:     return D_IDispatch;
            case ERROR:         return D_Error; 
            case BOOL:          return D_Boolean; 
            case VARIANT:       return D_Variant;
            case IUNKNOWN:      return D_IUnknown; 
            case DECIMAL:       return D_Decimal;
            case I1:            return D_TinyInt;
            case UI1:           return D_UnsignedTinyInt;
            case UI2:           return D_UnsignedSmallInt; 
            case UI4:           return D_UnsignedInt;
            case I8:            return D_BigInt; 
            case UI8:           return D_UnsignedBigInt; 
            case FILETIME:      return D_Filetime;
            case GUID:          return D_Guid; 
            case BYTES:         return (isLong) ? D_LongVarBinary : (isFixed) ? D_Binary : D_VarBinary;
            case STR:           return (isLong) ? D_LongVarChar : (isFixed) ? D_Char : D_VarChar;
            case WSTR:          return (isLong) ? D_LongVarWChar : (isFixed) ? D_WChar : D_VarWChar;
            case NUMERIC:       return D_Numeric; 
          //case UDT:
            case DBDATE:        return D_DBDate; 
            case DBTIME:        return D_DBTime; 
            case DBTIMESTAMP:   return D_DBTimeStamp;
            case HCHAPTER:      return D_Chapter; 
            case PROPVARIANT:   return D_PropVariant;
            case VARNUMERIC:    return D_VarNumeric;
            case XML:           return D_Xml;
            case UDT:           return D_Udt; 
          //case VECTOR:
          //case ARRAY: 
          //case BYREF: 
          //case RESERVED:
            default: 
                if (0 != (NativeDBType.VECTOR & dbType)) {
                    throw ODB.DBBindingGetVector();
                }
                return D_Variant; // MDAC 72067 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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