OleDbCommandBuilder.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / OleDb / OleDbCommandBuilder.cs / 1305376 / OleDbCommandBuilder.cs

                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.OleDb {
 
    using System;
    using System.ComponentModel;
    using System.Data;
    using System.Data.Common; 
    using System.Data.ProviderBase;
    using System.Diagnostics; 
    using System.Globalization; 
    using System.Text;
 
    public sealed class OleDbCommandBuilder : DbCommandBuilder {

        public OleDbCommandBuilder() : base() {
            GC.SuppressFinalize(this); 
        }
 
        public OleDbCommandBuilder(OleDbDataAdapter adapter) : this() { 
            DataAdapter = adapter;
        } 

        [
        DefaultValue(null),
        ResCategoryAttribute(Res.DataCategory_Update), 
        ResDescriptionAttribute(Res.OleDbCommandBuilder_DataAdapter), // MDAC 60524
        ] 
        new public OleDbDataAdapter DataAdapter { 
            get {
                return (base.DataAdapter as OleDbDataAdapter); 
            }
            set {
                base.DataAdapter = value;
            } 
        }
 
        private void OleDbRowUpdatingHandler(object sender, OleDbRowUpdatingEventArgs ruevent) { 
            RowUpdatingHandler(ruevent);
        } 

        new public OleDbCommand GetInsertCommand() {
            return (OleDbCommand) base.GetInsertCommand();
        } 
        new public OleDbCommand GetInsertCommand(bool useColumnsForParameterNames) {
            return (OleDbCommand) base.GetInsertCommand(useColumnsForParameterNames); 
        } 

        new public OleDbCommand GetUpdateCommand() { 
            return (OleDbCommand) base.GetUpdateCommand();
        }
        new public OleDbCommand GetUpdateCommand(bool useColumnsForParameterNames) {
            return (OleDbCommand) base.GetUpdateCommand(useColumnsForParameterNames); 
        }
 
        new public OleDbCommand GetDeleteCommand() { 
            return (OleDbCommand) base.GetDeleteCommand();
        } 
        new public OleDbCommand GetDeleteCommand(bool useColumnsForParameterNames) {
            return (OleDbCommand) base.GetDeleteCommand(useColumnsForParameterNames);
        }
 
        override protected string GetParameterName(int parameterOrdinal) {
            return "p" + parameterOrdinal.ToString(System.Globalization.CultureInfo.InvariantCulture); 
        } 
        override protected string GetParameterName(string parameterName) {
            return parameterName; 
        }

        override protected string GetParameterPlaceholder(int parameterOrdinal) {
            return "?"; 
        }
 
        override protected void ApplyParameterInfo(DbParameter parameter, DataRow datarow, StatementType statementType, bool whereClause) { 
            OleDbParameter p = (OleDbParameter) parameter;
            object valueType = datarow[SchemaTableColumn.ProviderType]; 
            p.OleDbType = (OleDbType) valueType;

            object bvalue = datarow[SchemaTableColumn.NumericPrecision];
            if (DBNull.Value != bvalue) { 
                byte bval = (byte)(short)bvalue;
                p.PrecisionInternal = ((0xff != bval) ? bval : (byte)0); 
            } 

            bvalue = datarow[SchemaTableColumn.NumericScale]; 
            if (DBNull.Value != bvalue) {
                byte bval = (byte)(short)bvalue;
                p.ScaleInternal = ((0xff != bval) ? bval : (byte)0);
            } 
        }
 
        static public void DeriveParameters(OleDbCommand command) { // MDAC 65927 
            OleDbConnection.ExecutePermission.Demand();
 
            if (null == command) {
                throw ADP.ArgumentNull("command");
            }
            switch (command.CommandType) { 
            case System.Data.CommandType.Text:
                throw ADP.DeriveParametersNotSupported(command); 
            case System.Data.CommandType.StoredProcedure: 
                break;
            case System.Data.CommandType.TableDirect: 
                // CommandType.TableDirect - do nothing, parameters are not supported
                throw ADP.DeriveParametersNotSupported(command);
            default:
                throw ADP.InvalidCommandType(command.CommandType); 
            }
            if (ADP.IsEmpty(command.CommandText)) { 
                throw ADP.CommandTextRequired(ADP.DeriveParameters); 
            }
            OleDbConnection connection = command.Connection; 
            if (null == connection) {
                throw ADP.ConnectionRequired(ADP.DeriveParameters);
            }
            ConnectionState state = connection.State; 
            if (ConnectionState.Open != state) {
                throw ADP.OpenConnectionRequired(ADP.DeriveParameters, state); 
            } 
            OleDbParameter[] list = DeriveParametersFromStoredProcedure(connection, command);
 
            OleDbParameterCollection parameters = command.Parameters;
            parameters.Clear();

            for(int i = 0; i < list.Length; ++i) { 
                parameters.Add(list[i]);
            } 
        } 

        // known difference: when getting the parameters for a sproc, the 
        //   return value gets marked as a return value but for a sql stmt
        //   the return value gets marked as an output parameter.
        static private OleDbParameter[] DeriveParametersFromStoredProcedure(OleDbConnection connection, OleDbCommand command) {
            OleDbParameter[] plist = new OleDbParameter[0]; 

            if (connection.SupportSchemaRowset(OleDbSchemaGuid.Procedure_Parameters)) { 
                string quotePrefix, quoteSuffix; 
                connection.GetLiteralQuotes(ADP.DeriveParameters, out quotePrefix, out quoteSuffix);
 
                Object[] parsed = MultipartIdentifier.ParseMultipartIdentifier(command.CommandText, quotePrefix, quoteSuffix, '.', 4, true, Res.OLEDB_OLEDBCommandText, false); // MDAC 70930
                if (null == parsed[3]) {
                    throw ADP.NoStoredProcedureExists(command.CommandText);
                } 

                Object[] restrictions = new object[4]; 
                object value; 

                // Parse returns an enforced 4 part array 
                // 0) Server - ignored but removal would be a run-time breaking change from V1.0
                // 1) Catalog
                // 2) Schema
                // 3) ProcedureName 

                // Restrictions array which is passed to OleDb API expects: 
                // 0) Catalog 
                // 1) Schema
                // 2) ProcedureName 
                // 3) ParameterName (leave null)

                // Copy from Parse format to OleDb API format
                Array.Copy(parsed, 1, restrictions, 0, 3); 

                //if (cmdConnection.IsServer_msdaora) { 
                //    restrictions[1] = Convert.ToString(cmdConnection.UserId).ToUpper(); 
                //}
                DataTable table = connection.GetSchemaRowset(OleDbSchemaGuid.Procedure_Parameters, restrictions); 

                if (null != table) {
                    DataColumnCollection columns = table.Columns;
 
                    DataColumn parameterName = null;
                    DataColumn parameterDirection = null; 
                    DataColumn dataType = null; 
                    DataColumn maxLen = null;
                    DataColumn numericPrecision = null; 
                    DataColumn numericScale = null;
                    DataColumn backendtype = null;

                    int index = columns.IndexOf(ODB.PARAMETER_NAME); 
                    if (-1 != index) parameterName = columns[index];
 
                    index = columns.IndexOf(ODB.PARAMETER_TYPE); 
                    if (-1 != index) parameterDirection = columns[index];
 
                    index = columns.IndexOf(ODB.DATA_TYPE);
                    if (-1 != index) dataType = columns[index];

                    index = columns.IndexOf(ODB.CHARACTER_MAXIMUM_LENGTH); 
                    if (-1 != index) maxLen = columns[index];
 
                    index = columns.IndexOf(ODB.NUMERIC_PRECISION); 
                    if (-1 != index) numericPrecision = columns[index];
 
                    index = columns.IndexOf(ODB.NUMERIC_SCALE);
                    if (-1 != index) numericScale = columns[index];

                    index = columns.IndexOf(ODB.TYPE_NAME); // MDAC 72315 
                    if (-1 != index) backendtype = columns[index];
 
                    DataRow[] dataRows = table.Select(null, ODB.ORDINAL_POSITION_ASC, DataViewRowState.CurrentRows); // MDAC 70928 
                    plist = new OleDbParameter[dataRows.Length];
                    for(index = 0; index < dataRows.Length; ++index) { 
                        DataRow dataRow = dataRows[index];

                        OleDbParameter parameter = new OleDbParameter();
 
                        if ((null != parameterName) && !dataRow.IsNull(parameterName, DataRowVersion.Default)) {
                            // $ 
                            parameter.ParameterName = Convert.ToString(dataRow[parameterName, DataRowVersion.Default], CultureInfo.InvariantCulture).TrimStart(new char[] { '@', ' ', ':'}); 
                        }
                        if ((null != parameterDirection) && !dataRow.IsNull(parameterDirection, DataRowVersion.Default)) { 
                            short direction = Convert.ToInt16(dataRow[parameterDirection, DataRowVersion.Default], CultureInfo.InvariantCulture);
                            parameter.Direction = ConvertToParameterDirection(direction);
                        }
                        if ((null != dataType) && !dataRow.IsNull(dataType, DataRowVersion.Default)) { 
                            // need to ping FromDBType, otherwise WChar->WChar when the user really wants VarWChar
                            short wType = Convert.ToInt16(dataRow[dataType, DataRowVersion.Default], CultureInfo.InvariantCulture); 
                            parameter.OleDbType = NativeDBType.FromDBType(wType, false, false).enumOleDbType; 
                        }
                        if ((null != maxLen) && !dataRow.IsNull(maxLen, DataRowVersion.Default)) { 
                            parameter.Size = Convert.ToInt32(dataRow[maxLen, DataRowVersion.Default], CultureInfo.InvariantCulture);
                        }
                        switch(parameter.OleDbType) {
                            case OleDbType.Decimal: 
                            case OleDbType.Numeric:
                            case OleDbType.VarNumeric: 
                                if ((null != numericPrecision) && !dataRow.IsNull(numericPrecision, DataRowVersion.Default)) { 
                                    // @devnote: unguarded cast from Int16 to Byte
                                    parameter.PrecisionInternal = (Byte) Convert.ToInt16(dataRow[numericPrecision], CultureInfo.InvariantCulture); 
                                }
                                if ((null != numericScale) && !dataRow.IsNull(numericScale, DataRowVersion.Default)) {
                                    // @devnote: unguarded cast from Int16 to Byte
                                    parameter.ScaleInternal = (Byte) Convert.ToInt16(dataRow[numericScale], CultureInfo.InvariantCulture); 
                                }
                                break; 
                            case OleDbType.VarBinary: // MDAC 72315 
                            case OleDbType.VarChar:
                            case OleDbType.VarWChar: 
                                value = dataRow[backendtype, DataRowVersion.Default];
                                if (value is string) {
                                    string backendtypename = ((string) value).ToLower(CultureInfo.InvariantCulture);
                                    switch(backendtypename) { 
                                    case "binary":
                                        parameter.OleDbType = OleDbType.Binary; 
                                        break; 
                                    //case "varbinary":
                                    //    parameter.OleDbType = OleDbType.VarBinary; 
                                    //    break;
                                    case "image":
                                        parameter.OleDbType = OleDbType.LongVarBinary;
                                        break; 
                                    case "char":
                                        parameter.OleDbType = OleDbType.Char; 
                                        break; 
                                    //case "varchar":
                                    //case "varchar2": 
                                    //    parameter.OleDbType = OleDbType.VarChar;
                                    //    break;
                                    case "text":
                                        parameter.OleDbType = OleDbType.LongVarChar; 
                                        break;
                                    case "nchar": 
                                        parameter.OleDbType = OleDbType.WChar; 
                                        break;
                                    //case "nvarchar": 
                                    //    parameter.OleDbType = OleDbType.VarWChar;
                                    case "ntext":
                                        parameter.OleDbType = OleDbType.LongVarWChar;
                                        break; 
                                    }
                                } 
                                break; 
                        }
                        //if (AdapterSwitches.OleDbSql.TraceVerbose) { 
                        //    ADP.Trace_Parameter("StoredProcedure", parameter);
                        //}
                        plist[index] = parameter;
                    } 
                }
                if ((0 == plist.Length) && connection.SupportSchemaRowset(OleDbSchemaGuid.Procedures)) { 
                    restrictions = new Object[4] { null, null, command.CommandText, null}; 
                    table = connection.GetSchemaRowset(OleDbSchemaGuid.Procedures, restrictions);
                    if (0 == table.Rows.Count) { 
                        throw ADP.NoStoredProcedureExists(command.CommandText);
                    }
                }
            } 
            else if (connection.SupportSchemaRowset(OleDbSchemaGuid.Procedures)) {
                Object[] restrictions = new Object[4] { null, null, command.CommandText, null}; 
                DataTable table = connection.GetSchemaRowset(OleDbSchemaGuid.Procedures, restrictions); 
                if (0 == table.Rows.Count) {
                    throw ADP.NoStoredProcedureExists(command.CommandText); 
                }
                // we don't ever expect a procedure with 0 parameters, they should have at least a return value
                throw ODB.NoProviderSupportForSProcResetParameters(connection.Provider); // MDAC 71968
            } 
            else {
                throw ODB.NoProviderSupportForSProcResetParameters(connection.Provider); // MDAC 70918 
            } 
            return plist;
        } 

        static private ParameterDirection ConvertToParameterDirection(int value) {
            switch (value) {
                case ODB.DBPARAMTYPE_INPUT: 
                    return System.Data.ParameterDirection.Input;
                case ODB.DBPARAMTYPE_INPUTOUTPUT: 
                    return System.Data.ParameterDirection.InputOutput; 
                case ODB.DBPARAMTYPE_OUTPUT:
                    return System.Data.ParameterDirection.Output; 
                case ODB.DBPARAMTYPE_RETURNVALUE:
                    return System.Data.ParameterDirection.ReturnValue;
                default:
                    return System.Data.ParameterDirection.Input; 
            }
        } 
 
        public override string QuoteIdentifier(string unquotedIdentifier){
            return QuoteIdentifier(unquotedIdentifier, null /* use DataAdapter.SelectCommand.Connection if available */); 
        }
        public string QuoteIdentifier( string unquotedIdentifier, OleDbConnection connection){
            ADP.CheckArgumentNull(unquotedIdentifier, "unquotedIdentifier");
 
            // if the user has specificed a prefix use the user specified  prefix and suffix
            // otherwise get them from the provider 
            string quotePrefix = QuotePrefix; 
            string quoteSuffix = QuoteSuffix;
            if (ADP.IsEmpty(quotePrefix) == true) { 
                if (connection == null) {
                    // VSTFDEVDIV 479567: use the adapter's connection if QuoteIdentifier was called from
                    // DbCommandBuilder instance (which does not have an overload that gets connection object)
                    connection = base.GetConnection() as OleDbConnection; 
                    if (connection == null) {
                        throw ADP.QuotePrefixNotSet(ADP.QuoteIdentifier); 
                    } 
                }
                connection.GetLiteralQuotes(ADP.QuoteIdentifier, out quotePrefix, out quoteSuffix); 
                // if the quote suffix is null assume that it is the same as the prefix (See OLEDB spec
                // IDBInfo::GetLiteralInfo DBLITERAL_QUOTE_SUFFIX.)
                if (quoteSuffix == null) {
                    quoteSuffix = quotePrefix; 
                }
            } 
 
            return ADP.BuildQuotedString(quotePrefix,quoteSuffix,unquotedIdentifier);
        } 

        override protected void SetRowUpdatingHandler(DbDataAdapter adapter) {
            Debug.Assert(adapter is OleDbDataAdapter, "!OleDbDataAdapter");
            if (adapter == base.DataAdapter) { // removal case 
                ((OleDbDataAdapter)adapter).RowUpdating -= OleDbRowUpdatingHandler;
            } 
            else { // adding case 
                ((OleDbDataAdapter)adapter).RowUpdating += OleDbRowUpdatingHandler;
            } 
        }

        public override string UnquoteIdentifier( string quotedIdentifier){
            return UnquoteIdentifier(quotedIdentifier, null /* use DataAdapter.SelectCommand.Connection if available */); 
        }
 
        public string UnquoteIdentifier(string quotedIdentifier, OleDbConnection connection){ 

            ADP.CheckArgumentNull(quotedIdentifier, "quotedIdentifier"); 


            // if the user has specificed a prefix use the user specified  prefix and suffix
            // otherwise get them from the provider 
            string quotePrefix = QuotePrefix;
            string quoteSuffix = QuoteSuffix; 
            if (ADP.IsEmpty(quotePrefix) == true) { 
                if (connection == null) {
                    // VSTFDEVDIV 479567: use the adapter's connection if UnquoteIdentifier was called from 
                    // DbCommandBuilder instance (which does not have an overload that gets connection object)
                    connection = base.GetConnection() as OleDbConnection;
                    if (connection == null) {
                        throw ADP.QuotePrefixNotSet(ADP.UnquoteIdentifier); 
                    }
                } 
                connection.GetLiteralQuotes(ADP.UnquoteIdentifier, out quotePrefix, out quoteSuffix); 
                // if the quote suffix is null assume that it is the same as the prefix (See OLEDB spec
                // IDBInfo::GetLiteralInfo DBLITERAL_QUOTE_SUFFIX.) 
                if (quoteSuffix == null) {
                    quoteSuffix = quotePrefix;
                }
            } 

            String unquotedIdentifier; 
            // ignoring the return value because it is acceptable for the quotedString to not be quoted in this 
            // context.
            ADP.RemoveStringQuotes(quotePrefix, quoteSuffix, quotedIdentifier, out unquotedIdentifier); 
            return unquotedIdentifier;

        }
 
    }
} 

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

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