Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / SQLTypes / SQLString.cs / 1 / SQLString.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// junfang
// [....]
// [....]
//-----------------------------------------------------------------------------
//*************************************************************************
// @File: SqlString.cs
//
// Create by: JunFang
//
// Purpose: Implementation of SqlString which is equivalent to
// data type "nvarchar/varchar" in SQL Server
//
// Notes:
//
// History:
//
// 09/30/99 JunFang Created.
//
// @EndHeader@
//*************************************************************************
using System;
using System.Data.Common;
using System.Globalization;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;
namespace System.Data.SqlTypes {
using System.Text;
using System.Configuration.Assemblies;
// Options that are used in comparison
[Flags,Serializable]
public enum SqlCompareOptions {
None = 0x00000000,
IgnoreCase = 0x00000001,
IgnoreNonSpace = 0x00000002,
IgnoreKanaType = 0x00000008, // ignore kanatype
IgnoreWidth = 0x00000010, // ignore width
BinarySort = 0x00008000, // binary sorting
BinarySort2 = 0x00004000, // binary sorting 2
}
///
///
/// Represents a variable-length stream of characters to be stored in or retrieved from the database.
///
///
[Serializable]
[StructLayout(LayoutKind.Sequential)]
[XmlSchemaProvider("GetXsdType")]
public struct SqlString : INullable, IComparable, IXmlSerializable {
private String m_value;
private CompareInfo m_cmpInfo;
private int m_lcid; // Locale Id
private SqlCompareOptions m_flag; // Compare flags
private bool m_fNotNull; // false if null
///
///
/// Represents a null value that can be assigned to the
///
public static readonly SqlString Null = new SqlString(true);
internal static readonly UnicodeEncoding x_UnicodeEncoding = new UnicodeEncoding();
///
///
public static readonly int IgnoreCase = 0x1;
///
///
public static readonly int IgnoreWidth = 0x10;
///
///
public static readonly int IgnoreNonSpace = 0x2;
///
///
public static readonly int IgnoreKanaType = 0x8;
///
///
public static readonly int BinarySort = 0x8000;
///
///
public static readonly int BinarySort2 = 0x4000;
private static readonly SqlCompareOptions x_iDefaultFlag =
SqlCompareOptions.IgnoreCase | SqlCompareOptions.IgnoreKanaType |
SqlCompareOptions.IgnoreWidth;
private static readonly CompareOptions x_iValidCompareOptionMask =
CompareOptions.IgnoreCase | CompareOptions.IgnoreWidth |
CompareOptions.IgnoreNonSpace | CompareOptions.IgnoreKanaType;
internal static readonly SqlCompareOptions x_iValidSqlCompareOptionMask =
SqlCompareOptions.IgnoreCase | SqlCompareOptions.IgnoreWidth |
SqlCompareOptions.IgnoreNonSpace | SqlCompareOptions.IgnoreKanaType |
SqlCompareOptions.BinarySort | SqlCompareOptions.BinarySort2;
internal static readonly int x_lcidUSEnglish = 0x00000409;
private static readonly int x_lcidBinary = 0x00008200;
// constructor
// construct a Null
private SqlString(bool fNull) {
m_value = null;
m_cmpInfo = null;
m_lcid = 0;
m_flag = SqlCompareOptions.None;
m_fNotNull = false;
}
// Constructor: Construct from both Unicode and NonUnicode data, according to fUnicode
///
///
/// Initializes a new instance of the
///
public SqlString(int lcid, SqlCompareOptions compareOptions, byte[] data, int index, int count, bool fUnicode) {
m_lcid = lcid;
ValidateSqlCompareOptions(compareOptions);
m_flag = compareOptions;
if (data == null) {
m_fNotNull = false;
m_value = null;
m_cmpInfo = null;
}
else {
m_fNotNull = true;
// m_cmpInfo is set lazily, so that we don't need to pay the cost
// unless the string is used in comparison.
m_cmpInfo = null;
if (fUnicode) {
m_value = x_UnicodeEncoding.GetString(data, index, count);
}
else {
CultureInfo culInfo = new CultureInfo(m_lcid);
Encoding cpe = System.Text.Encoding.GetEncoding(culInfo.TextInfo.ANSICodePage);
m_value = cpe.GetString(data, index, count);
}
}
}
// Constructor: Construct from both Unicode and NonUnicode data, according to fUnicode
///
///
/// Initializes a new instance of the
///
public SqlString(int lcid, SqlCompareOptions compareOptions, byte[] data, bool fUnicode)
: this(lcid, compareOptions, data, 0, data.Length, fUnicode) {
}
///
///
/// Initializes a new instance of the
///
public SqlString(int lcid, SqlCompareOptions compareOptions, byte[] data, int index, int count)
: this(lcid, compareOptions, data, index, count, true) {
}
///
///
/// Initializes a new instance of the
///
public SqlString(int lcid, SqlCompareOptions compareOptions, byte[] data)
: this(lcid, compareOptions, data, 0, data.Length, true) {
}
/*
//
*/
///
///
/// Initializes a new instance of the
///
public SqlString(String data, int lcid, SqlCompareOptions compareOptions) {
m_lcid = lcid;
ValidateSqlCompareOptions(compareOptions);
m_flag = compareOptions;
m_cmpInfo = null;
if (data == null) {
m_fNotNull = false;
m_value = null;
}
else {
m_fNotNull = true;
m_value = data; // PERF: do not String.Copy
}
}
///
///
/// Initializes a new instance of the
///
public SqlString(String data, int lcid) : this(data, lcid, x_iDefaultFlag) {
}
///
///
/// Initializes a new instance of the
///
public SqlString(String data) : this(data, System.Globalization.CultureInfo.CurrentCulture.LCID, x_iDefaultFlag) {
}
private SqlString(int lcid, SqlCompareOptions compareOptions, String data, CompareInfo cmpInfo) {
m_lcid = lcid;
ValidateSqlCompareOptions(compareOptions);
m_flag = compareOptions;
if (data == null) {
m_fNotNull = false;
m_value = null;
m_cmpInfo = null;
}
else {
m_value = data;
m_cmpInfo = cmpInfo;
m_fNotNull = true;
}
}
// INullable
///
///
/// Gets whether the
///
public bool IsNull {
get { return !m_fNotNull;}
}
// property: Value
///
///
/// Gets the string that is to be stored.
///
///
public String Value {
get {
if (!IsNull)
return m_value;
else
throw new SqlNullValueException();
}
}
///
/// [To be supplied.]
///
public int LCID {
get {
if (!IsNull)
return m_lcid;
else
throw new SqlNullValueException();
}
}
///
/// [To be supplied.]
///
public CultureInfo CultureInfo {
get {
if (!IsNull)
return CultureInfo.GetCultureInfo(m_lcid);
else
throw new SqlNullValueException();
}
}
private void SetCompareInfo() {
SQLDebug.Check(!IsNull);
if (m_cmpInfo == null)
m_cmpInfo = (CultureInfo.GetCultureInfo(m_lcid)).CompareInfo;
}
///
/// [To be supplied.]
///
public CompareInfo CompareInfo {
get {
if (!IsNull) {
SetCompareInfo();
return m_cmpInfo;
}
else
throw new SqlNullValueException();
}
}
///
/// [To be supplied.]
///
public SqlCompareOptions SqlCompareOptions {
get {
if (!IsNull)
return m_flag;
else
throw new SqlNullValueException();
}
}
// Implicit conversion from String to SqlString
///
/// [To be supplied.]
///
public static implicit operator SqlString(String x) {
return new SqlString(x);
}
// Explicit conversion from SqlString to String. Throw exception if x is Null.
///
/// [To be supplied.]
///
public static explicit operator String(SqlString x) {
return x.Value;
}
///
///
/// Converts a
///
public override String ToString() {
return IsNull ? SQLResource.NullString : m_value;
}
///
/// [To be supplied.]
///
public byte[] GetUnicodeBytes() {
if (IsNull)
return null;
return x_UnicodeEncoding.GetBytes(m_value);
}
///
/// [To be supplied.]
///
public byte[] GetNonUnicodeBytes() {
if (IsNull)
return null;
// Get the CultureInfo
CultureInfo culInfo = new CultureInfo(m_lcid);
Encoding cpe = System.Text.Encoding.GetEncoding(culInfo.TextInfo.ANSICodePage);
return cpe.GetBytes(m_value);
}
/*
internal int GetSQLCID() {
if (IsNull)
throw new SqlNullValueException();
return MAKECID(m_lcid, m_flag);
}
*/
// Binary operators
// Concatenation
///
/// [To be supplied.]
///
public static SqlString operator +(SqlString x, SqlString y) {
if (x.IsNull || y.IsNull)
return SqlString.Null;
if (x.m_lcid != y.m_lcid || x.m_flag != y.m_flag)
throw new SqlTypeException(SQLResource.ConcatDiffCollationMessage);
return new SqlString(x.m_lcid, x.m_flag, x.m_value + y.m_value,
(x.m_cmpInfo == null) ? y.m_cmpInfo : x.m_cmpInfo);
}
// Comparison operators
private static SqlBoolean Compare(SqlString x, SqlString y, EComparison ecExpectedResult) {
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
if (x.m_lcid != y.m_lcid || x.m_flag != y.m_flag)
throw new SqlTypeException(SQLResource.CompareDiffCollationMessage);
x.SetCompareInfo();
y.SetCompareInfo();
SQLDebug.Check(x.FBinarySort() || (x.m_cmpInfo != null && y.m_cmpInfo != null),
"x.FBinarySort() || (x.m_cmpInfo != null && y.m_cmpInfo != null)", "");
int iCmpResult;
if ((x.m_flag & SqlCompareOptions.BinarySort) != 0)
iCmpResult = CompareBinary(x, y);
else if ((x.m_flag & SqlCompareOptions.BinarySort2) != 0)
iCmpResult = CompareBinary2(x, y);
else {
char[] rgchX = x.m_value.ToCharArray();
char[] rgchY = y.m_value.ToCharArray();
int cwchX = rgchX.Length;
int cwchY = rgchY.Length;
// Trim the trailing space for comparison
while (cwchX > 0 && rgchX[cwchX - 1] == ' ')
cwchX --;
while (cwchY > 0 && rgchY[cwchY - 1] == ' ')
cwchY --;
String strX = (cwchX == rgchX.Length) ? x.m_value : new String(rgchX, 0, cwchX);
String strY = (cwchY == rgchY.Length) ? y.m_value : new String(rgchY, 0, cwchY);
CompareOptions options = CompareOptionsFromSqlCompareOptions(x.m_flag);
iCmpResult = x.m_cmpInfo.Compare(strX, strY, options);
}
bool fResult = false;
switch (ecExpectedResult) {
case EComparison.EQ:
fResult = (iCmpResult == 0);
break;
case EComparison.LT:
fResult = (iCmpResult < 0);
break;
case EComparison.LE:
fResult = (iCmpResult <= 0);
break;
case EComparison.GT:
fResult = (iCmpResult > 0);
break;
case EComparison.GE:
fResult = (iCmpResult >= 0);
break;
default:
SQLDebug.Check(false, "Invalid ecExpectedResult");
return SqlBoolean.Null;
}
return new SqlBoolean(fResult);
}
// Implicit conversions
// Explicit conversions
// Explicit conversion from SqlBoolean to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlBoolean x) {
return x.IsNull ? Null : new SqlString((x.Value).ToString());
}
// Explicit conversion from SqlByte to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlByte x) {
return x.IsNull ? Null : new SqlString((x.Value).ToString((IFormatProvider)null));
}
// Explicit conversion from SqlInt16 to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlInt16 x) {
return x.IsNull ? Null : new SqlString((x.Value).ToString((IFormatProvider)null));
}
// Explicit conversion from SqlInt32 to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlInt32 x) {
return x.IsNull ? Null : new SqlString((x.Value).ToString((IFormatProvider)null));
}
// Explicit conversion from SqlInt64 to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlInt64 x) {
return x.IsNull ? Null : new SqlString((x.Value).ToString((IFormatProvider)null));
}
// Explicit conversion from SqlSingle to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlSingle x) {
return x.IsNull ? Null : new SqlString((x.Value).ToString((IFormatProvider)null));
}
// Explicit conversion from SqlDouble to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlDouble x) {
return x.IsNull ? Null : new SqlString((x.Value).ToString((IFormatProvider)null));
}
// Explicit conversion from SqlDecimal to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlDecimal x) {
return x.IsNull ? Null : new SqlString(x.ToString());
}
// Explicit conversion from SqlMoney to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlMoney x) {
return x.IsNull ? Null : new SqlString(x.ToString());
}
// Explicit conversion from SqlDateTime to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlDateTime x) {
return x.IsNull ? Null : new SqlString(x.ToString());
}
// Explicit conversion from SqlGuid to SqlString
///
/// [To be supplied.]
///
public static explicit operator SqlString(SqlGuid x) {
return x.IsNull ? Null : new SqlString(x.ToString());
}
///
/// [To be supplied.]
///
public SqlString Clone() {
if (IsNull)
return new SqlString(true);
else {
SqlString ret = new SqlString(m_value, m_lcid, m_flag);
return ret;
}
}
// Overloading comparison operators
///
/// [To be supplied.]
///
public static SqlBoolean operator==(SqlString x, SqlString y) {
return Compare(x, y, EComparison.EQ);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator!=(SqlString x, SqlString y) {
return ! (x == y);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator<(SqlString x, SqlString y) {
return Compare(x, y, EComparison.LT);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator>(SqlString x, SqlString y) {
return Compare(x, y, EComparison.GT);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator<=(SqlString x, SqlString y) {
return Compare(x, y, EComparison.LE);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator>=(SqlString x, SqlString y) {
return Compare(x, y, EComparison.GE);
}
//--------------------------------------------------
// Alternative methods for overloaded operators
//--------------------------------------------------
// Alternative method for operator +
public static SqlString Concat(SqlString x, SqlString y) {
return x + y;
}
public static SqlString Add(SqlString x, SqlString y) {
return x + y;
}
// Alternative method for operator ==
public static SqlBoolean Equals(SqlString x, SqlString y) {
return (x == y);
}
// Alternative method for operator !=
public static SqlBoolean NotEquals(SqlString x, SqlString y) {
return (x != y);
}
// Alternative method for operator <
public static SqlBoolean LessThan(SqlString x, SqlString y) {
return (x < y);
}
// Alternative method for operator >
public static SqlBoolean GreaterThan(SqlString x, SqlString y) {
return (x > y);
}
// Alternative method for operator <=
public static SqlBoolean LessThanOrEqual(SqlString x, SqlString y) {
return (x <= y);
}
// Alternative method for operator >=
public static SqlBoolean GreaterThanOrEqual(SqlString x, SqlString y) {
return (x >= y);
}
// Alternative method for conversions.
public SqlBoolean ToSqlBoolean() {
return (SqlBoolean)this;
}
public SqlByte ToSqlByte() {
return (SqlByte)this;
}
public SqlDateTime ToSqlDateTime() {
return (SqlDateTime)this;
}
public SqlDouble ToSqlDouble() {
return (SqlDouble)this;
}
public SqlInt16 ToSqlInt16() {
return (SqlInt16)this;
}
public SqlInt32 ToSqlInt32() {
return (SqlInt32)this;
}
public SqlInt64 ToSqlInt64() {
return (SqlInt64)this;
}
public SqlMoney ToSqlMoney() {
return (SqlMoney)this;
}
public SqlDecimal ToSqlDecimal() {
return (SqlDecimal)this;
}
public SqlSingle ToSqlSingle() {
return (SqlSingle)this;
}
public SqlGuid ToSqlGuid() {
return (SqlGuid)this;
}
//
private static void ValidateSqlCompareOptions(SqlCompareOptions compareOptions) {
if ((compareOptions & x_iValidSqlCompareOptionMask) != compareOptions)
throw new ArgumentOutOfRangeException ("compareOptions");
}
public static CompareOptions CompareOptionsFromSqlCompareOptions(SqlCompareOptions compareOptions) {
CompareOptions options = CompareOptions.None;
ValidateSqlCompareOptions(compareOptions);
if ((compareOptions & (SqlCompareOptions.BinarySort | SqlCompareOptions.BinarySort2)) != 0)
throw ADP.ArgumentOutOfRange("compareOptions");
else {
if ((compareOptions & SqlCompareOptions.IgnoreCase) != 0)
options |= CompareOptions.IgnoreCase;
if ((compareOptions & SqlCompareOptions.IgnoreNonSpace) != 0)
options |= CompareOptions.IgnoreNonSpace;
if ((compareOptions & SqlCompareOptions.IgnoreKanaType) != 0)
options |= CompareOptions.IgnoreKanaType;
if ((compareOptions & SqlCompareOptions.IgnoreWidth) != 0)
options |= CompareOptions.IgnoreWidth;
}
return options;
}
/*
private static SqlCompareOptions SqlCompareOptionsFromCompareOptions(CompareOptions compareOptions) {
SqlCompareOptions sqlOptions = SqlCompareOptions.None;
if ((compareOptions & x_iValidCompareOptionMask) != compareOptions)
throw new ArgumentOutOfRangeException ("compareOptions");
else {
if ((compareOptions & CompareOptions.IgnoreCase) != 0)
sqlOptions |= SqlCompareOptions.IgnoreCase;
if ((compareOptions & CompareOptions.IgnoreNonSpace) != 0)
sqlOptions |= SqlCompareOptions.IgnoreNonSpace;
if ((compareOptions & CompareOptions.IgnoreKanaType) != 0)
sqlOptions |= SqlCompareOptions.IgnoreKanaType;
if ((compareOptions & CompareOptions.IgnoreWidth) != 0)
sqlOptions |= SqlCompareOptions.IgnoreWidth;
}
return sqlOptions;
}
*/
private bool FBinarySort() {
return(!IsNull && (m_flag & (SqlCompareOptions.BinarySort | SqlCompareOptions.BinarySort2)) != 0);
}
// Wide-character string comparison for Binary Unicode Collation
// Return values:
// -1 : wstr1 < wstr2
// 0 : wstr1 = wstr2
// 1 : wstr1 > wstr2
//
// Does a memory comparison.
private static int CompareBinary(SqlString x, SqlString y) {
byte[] rgDataX = x_UnicodeEncoding.GetBytes(x.m_value);
byte[] rgDataY = x_UnicodeEncoding.GetBytes(y.m_value);
int cbX = rgDataX.Length;
int cbY = rgDataY.Length;
int cbMin = cbX < cbY ? cbX : cbY;
int i;
SQLDebug.Check(cbX % 2 == 0);
SQLDebug.Check(cbY % 2 == 0);
for (i = 0; i < cbMin; i ++) {
if (rgDataX[i] < rgDataY[i])
return -1;
else if (rgDataX[i] > rgDataY[i])
return 1;
}
i = cbMin;
int iCh;
int iSpace = (int)' ';
if (cbX < cbY) {
for (; i < cbY; i += 2) {
iCh = ((int)rgDataY[i + 1]) << 8 + rgDataY[i];
if (iCh != iSpace)
return (iSpace > iCh) ? 1 : -1;
}
}
else {
for (; i < cbX; i += 2) {
iCh = ((int)rgDataX[i + 1]) << 8 + rgDataX[i];
if (iCh != iSpace)
return (iCh > iSpace) ? 1 : -1;
}
}
return 0;
}
// Wide-character string comparison for Binary2 Unicode Collation
// Return values:
// -1 : wstr1 < wstr2
// 0 : wstr1 = wstr2
// 1 : wstr1 > wstr2
//
// Does a wchar comparison (different from memcmp of BinarySort).
private static int CompareBinary2(SqlString x, SqlString y) {
SQLDebug.Check(!x.IsNull && !y.IsNull);
char[] rgDataX = x.m_value.ToCharArray();
char[] rgDataY = y.m_value.ToCharArray();
int cwchX = rgDataX.Length;
int cwchY = rgDataY.Length;
int cwchMin = cwchX < cwchY ? cwchX : cwchY;
int i;
for (i = 0; i < cwchMin; i ++) {
if (rgDataX[i] < rgDataY[i])
return -1;
else if (rgDataX[i] > rgDataY[i])
return 1;
}
// If compares equal up to one of the string terminates,
// pad it with spaces and compare with the rest of the other one.
//
char chSpace = ' ';
if (cwchX < cwchY) {
for (i = cwchMin; i < cwchY; i ++) {
if (rgDataY[i] != chSpace)
return (chSpace > rgDataY[i]) ? 1 : -1;
}
}
else {
for (i = cwchMin; i < cwchX; i ++) {
if (rgDataX[i] != chSpace)
return (rgDataX[i] > chSpace) ? 1 : -1;
}
}
return 0;
}
/*
private void Print() {
Debug.WriteLine("SqlString - ");
Debug.WriteLine("\tlcid = " + m_lcid.ToString());
Debug.Write("\t");
if ((m_flag & SqlCompareOptions.IgnoreCase) != 0)
Debug.Write("IgnoreCase, ");
if ((m_flag & SqlCompareOptions.IgnoreNonSpace) != 0)
Debug.Write("IgnoreNonSpace, ");
if ((m_flag & SqlCompareOptions.IgnoreKanaType) != 0)
Debug.Write("IgnoreKanaType, ");
if ((m_flag & SqlCompareOptions.IgnoreWidth) != 0)
Debug.Write("IgnoreWidth, ");
Debug.WriteLine("");
Debug.WriteLine("\tvalue = " + m_value);
Debug.WriteLine("\tcmpinfo = " + m_cmpInfo);
}
*/
// IComparable
// Compares this object to another object, returning an integer that
// indicates the relationship.
// Returns a value less than zero if this < object, zero if this = object,
// or a value greater than zero if this > object.
// null is considered to be less than any instance.
// If object is not of same type, this method throws an ArgumentException.
///
/// [To be supplied.]
///
public int CompareTo(Object value) {
if (value is SqlString) {
SqlString i = (SqlString)value;
return CompareTo(i);
}
throw ADP.WrongType(value.GetType(), typeof(SqlString));
}
public int CompareTo(SqlString value) {
// If both Null, consider them equal.
// Otherwise, Null is less than anything.
if (IsNull)
return value.IsNull ? 0 : -1;
else if (value.IsNull)
return 1;
if (this < value) return -1;
if (this > value) return 1;
return 0;
}
// Compares this instance with a specified object
///
/// [To be supplied.]
///
public override bool Equals(Object value) {
if (!(value is SqlString)) {
return false;
}
SqlString i = (SqlString)value;
if (i.IsNull || IsNull)
return (i.IsNull && IsNull);
else
return (this == i).Value;
}
// For hashing purpose
///
/// [To be supplied.]
///
public override int GetHashCode() {
if (IsNull)
return 0;
byte[] rgbSortKey;
if (FBinarySort())
rgbSortKey = x_UnicodeEncoding.GetBytes(m_value.TrimEnd());
else
{
SetCompareInfo();
CompareOptions options = CompareOptionsFromSqlCompareOptions(m_flag);
rgbSortKey = m_cmpInfo.GetSortKey(m_value.TrimEnd(), options).KeyData;
}
return SqlBinary.HashByteArray(rgbSortKey, rgbSortKey.Length);
}
///
/// [To be supplied.]
///
XmlSchema IXmlSerializable.GetSchema() { return null; }
///
/// [To be supplied.]
///
void IXmlSerializable.ReadXml(XmlReader reader) {
string isNull = reader.GetAttribute("nil", XmlSchema.InstanceNamespace);
if (isNull != null && XmlConvert.ToBoolean(isNull)) {
m_fNotNull = false;
}
else {
m_value = reader.ReadElementString();
m_fNotNull = true;
}
}
///
/// [To be supplied.]
///
void IXmlSerializable.WriteXml(XmlWriter writer) {
if (IsNull) {
writer.WriteAttributeString("xsi", "nil", XmlSchema.InstanceNamespace, "true");
}
else {
writer.WriteString(m_value);
}
}
///
/// [To be supplied.]
///
public static XmlQualifiedName GetXsdType(XmlSchemaSet schemaSet) {
return new XmlQualifiedName("string", XmlSchema.Namespace);
}
} // SqlString
/*
internal struct SLocaleMapItem {
public int lcid; // the primary key, not nullable
public String name; // unique, nullable
public int idCodePage; // the ANSI default code page of the locale
public SLocaleMapItem(int lid, String str, int cpid) {
lcid = lid;
name = str;
idCodePage = cpid;
}
}
// Struct to map lcid to ordinal
internal struct SLcidOrdMapItem {
internal int lcid;
internal int uiOrd;
};
// Class to store map of lcids to ordinal
internal class CBuildLcidOrdMap {
internal SLcidOrdMapItem[] m_rgLcidOrdMap;
internal int m_cValidLocales;
internal int m_uiPosEnglish; // Start binary searches here - this is index in array, not ordinal
// Constructor builds the array sorted by lcid
// We use a simple n**2 sort because the array is mostly sorted anyway
// and objects of this class will be const, hence this will be called
// only by VC compiler
public CBuildLcidOrdMap() {
int i,j;
m_rgLcidOrdMap = new SLcidOrdMapItem[SqlString.x_cLocales];
// Compact the array
for (i=0,j=0; i < SqlString.x_cLocales; i++) {
if (SqlString.x_rgLocaleMap[i].lcid != SqlString.x_lcidUnused) {
m_rgLcidOrdMap[j].lcid = SqlString.x_rgLocaleMap[i].lcid;
m_rgLcidOrdMap[j].uiOrd = i;
j++;
}
}
m_cValidLocales = j;
// Set the rest to invalid
while (j < SqlString.x_cLocales) {
m_rgLcidOrdMap[j].lcid = SqlString.x_lcidUnused;
m_rgLcidOrdMap[j].uiOrd = 0;
j++;
}
// Now sort in place
// Algo:
// Start from 1, assume list before i is sorted, if next item
// violates this assumption, exchange with prev items until the
// item is in its correct place
for (i=1; i0 &&
m_rgLcidOrdMap[j].lcid < m_rgLcidOrdMap[j-1].lcid; j--) {
// Swap with prev element
int lcidTemp = m_rgLcidOrdMap[j-1].lcid;
int uiOrdTemp = m_rgLcidOrdMap[j-1].uiOrd;
m_rgLcidOrdMap[j-1].lcid = m_rgLcidOrdMap[j].lcid;
m_rgLcidOrdMap[j-1].uiOrd = m_rgLcidOrdMap[j].uiOrd;
m_rgLcidOrdMap[j].lcid = lcidTemp;
m_rgLcidOrdMap[j].uiOrd = uiOrdTemp;
}
}
// Set the position of the US_English LCID (Latin1_General)
for (i=0; i
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