Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / SQLTypes / SQLMoney.cs / 1 / SQLMoney.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// junfang
// [....]
// [....]
//-----------------------------------------------------------------------------
//*************************************************************************
// @File: SqlMoney.cs
//
// Create by: JunFang
//
// Purpose: Implementation of SqlMoney which is equivalent to
// data type "money" in SQL Server
//
// Notes:
//
// History:
//
// 09/17/99 JunFang Created and implemented as first drop.
//
// @EndHeader@
//*************************************************************************
using System;
using System.Data.Common;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Globalization;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;
namespace System.Data.SqlTypes {
///
///
/// Represents a currency value ranging from
/// -2
///
[Serializable]
[StructLayout(LayoutKind.Sequential)]
[XmlSchemaProvider("GetXsdType")]
public struct SqlMoney : INullable, IComparable, IXmlSerializable {
private bool m_fNotNull; // false if null
private long m_value;
// SQL Server stores money8 as ticks of 1/10000.
internal static readonly int x_iMoneyScale = 4;
private static readonly long x_lTickBase = 10000;
private static readonly double x_dTickBase = (double)x_lTickBase;
private static readonly long MinLong = unchecked((long)0x8000000000000000L) / x_lTickBase;
private static readonly long MaxLong = 0x7FFFFFFFFFFFFFFFL / x_lTickBase;
// constructor
// construct a Null
private SqlMoney(bool fNull) {
m_fNotNull = false;
m_value = 0;
}
// Constructs from a long value without scaling. The ignored parameter exists
// only to distinguish this constructor from the constructor that takes a long.
// Used only internally.
internal SqlMoney(long value, int ignored) {
m_value = value;
m_fNotNull = true;
}
///
///
/// Initializes a new instance of the
///
public SqlMoney(int value) {
m_value = (long)value * x_lTickBase;
m_fNotNull = true;
}
///
///
/// Initializes a new instance of the
///
public SqlMoney(long value) {
if (value < MinLong || value > MaxLong)
throw new OverflowException(SQLResource.ArithOverflowMessage);
m_value = value * x_lTickBase;
m_fNotNull = true;
}
///
///
/// Initializes a new instance of the
///
public SqlMoney(Decimal value) {
// Since Decimal is a value type, operate directly on value, don't worry about changing it.
SqlDecimal snum = new SqlDecimal(value);
snum.AdjustScale(x_iMoneyScale - snum.Scale, true);
Debug.Assert(snum.Scale == x_iMoneyScale);
if (snum.m_data3 != 0 || snum.m_data4 != 0)
throw new OverflowException(SQLResource.ArithOverflowMessage);
bool fPositive = snum.IsPositive;
ulong ulValue = (ulong)snum.m_data1 + ( ((ulong)snum.m_data2) << 32 );
if (fPositive && ulValue > (ulong)(Int64.MaxValue) ||
!fPositive && ulValue > unchecked((ulong)(Int64.MinValue)))
throw new OverflowException(SQLResource.ArithOverflowMessage);
m_value = fPositive ? (long)ulValue : unchecked(- (long)ulValue);
m_fNotNull = true;
}
///
///
/// Initializes a new instance of the
///
public SqlMoney(double value) : this(new Decimal(value)) {
}
// INullable
///
///
/// Gets a value indicating whether the
///
public bool IsNull {
get { return !m_fNotNull;}
}
// property: Value
///
///
/// Gets or sets the monetary value of an instance of the
///
public Decimal Value {
get {
if (m_fNotNull)
return ToDecimal();
else
throw new SqlNullValueException();
}
}
///
/// [To be supplied.]
///
public Decimal ToDecimal() {
if(IsNull)
throw new SqlNullValueException();
bool fNegative = false;
long value = m_value;
if (m_value < 0) {
fNegative = true;
value = - m_value;
}
return new Decimal(unchecked((int)value), unchecked((int)(value >> 32)), 0, fNegative, (byte)x_iMoneyScale);
}
///
/// [To be supplied.]
///
public long ToInt64() {
if(IsNull)
throw new SqlNullValueException();
long ret = m_value / (x_lTickBase / 10);
bool fPositive = (ret >= 0);
long remainder = ret % 10;
ret = ret / 10;
if (remainder >= 5) {
if (fPositive)
ret ++;
else
ret --;
}
return ret;
}
internal long ToSqlInternalRepresentation() {
if(IsNull)
throw new SqlNullValueException();
return m_value;
}
///
/// [To be supplied.]
///
public int ToInt32() {
return checked((int)(ToInt64()));
}
///
/// [To be supplied.]
///
public double ToDouble() {
return Decimal.ToDouble(ToDecimal());
}
// Implicit conversion from Decimal to SqlMoney
///
/// [To be supplied.]
///
public static implicit operator SqlMoney(Decimal x) {
return new SqlMoney(x);
}
// Explicit conversion from Double to SqlMoney
public static explicit operator SqlMoney(double x) {
return new SqlMoney(x);
}
// Implicit conversion from long to SqlMoney
public static implicit operator SqlMoney(long x) {
return new SqlMoney(new Decimal(x));
}
// Explicit conversion from SqlMoney to Decimal. Throw exception if x is Null.
///
/// [To be supplied.]
///
public static explicit operator Decimal(SqlMoney x) {
return x.Value;
}
///
/// [To be supplied.]
///
public override String ToString() {
if (this.IsNull) {
return SQLResource.NullString;
}
Decimal money = ToDecimal();
// Formatting of SqlMoney: At least two digits after decimal point
return money.ToString("#0.00##", (IFormatProvider)null);
}
///
/// [To be supplied.]
///
public static SqlMoney Parse(String s) {
// Try parsing the format of '#0.00##' generated by ToString() by using the
// culture invariant NumberFormatInfo as well as the current culture's format
//
Decimal d;
SqlMoney money;
const NumberStyles SqlNumberStyle =
NumberStyles.AllowCurrencySymbol |
NumberStyles.AllowDecimalPoint |
NumberStyles.AllowParentheses |
NumberStyles.AllowTrailingSign |
NumberStyles.AllowLeadingSign |
NumberStyles.AllowTrailingWhite |
NumberStyles.AllowLeadingWhite;
if ( s == SQLResource.NullString) {
money = SqlMoney.Null;
}
else if (Decimal.TryParse(s, SqlNumberStyle, NumberFormatInfo.InvariantInfo, out d)) {
money = new SqlMoney(d);
}
else {
money = new SqlMoney(Decimal.Parse(s, NumberStyles.Currency, NumberFormatInfo.CurrentInfo));
}
return money;
}
// Unary operators
///
/// [To be supplied.]
///
public static SqlMoney operator -(SqlMoney x) {
if (x.IsNull)
return Null;
if (x.m_value == MinLong)
throw new OverflowException(SQLResource.ArithOverflowMessage);
return new SqlMoney(-x.m_value, 0);
}
// Binary operators
// Arithmetic operators
///
/// [To be supplied.]
///
public static SqlMoney operator +(SqlMoney x, SqlMoney y) {
try {
return(x.IsNull || y.IsNull) ? Null : new SqlMoney(checked(x.m_value + y.m_value), 0);
}
catch (OverflowException) {
throw new OverflowException(SQLResource.ArithOverflowMessage);
}
}
///
/// [To be supplied.]
///
public static SqlMoney operator -(SqlMoney x, SqlMoney y) {
try {
return(x.IsNull || y.IsNull) ? Null : new SqlMoney(checked(x.m_value - y.m_value), 0);
}
catch (OverflowException) {
throw new OverflowException(SQLResource.ArithOverflowMessage);
}
}
///
/// [To be supplied.]
///
public static SqlMoney operator *(SqlMoney x, SqlMoney y) {
return (x.IsNull || y.IsNull) ? Null :
new SqlMoney(Decimal.Multiply(x.ToDecimal(), y.ToDecimal()));
}
///
/// [To be supplied.]
///
public static SqlMoney operator /(SqlMoney x, SqlMoney y) {
return (x.IsNull || y.IsNull) ? Null :
new SqlMoney(Decimal.Divide(x.ToDecimal(), y.ToDecimal()));
}
// Implicit conversions
// Implicit conversion from SqlBoolean to SqlMoney
///
/// [To be supplied.]
///
public static explicit operator SqlMoney(SqlBoolean x) {
return x.IsNull ? Null : new SqlMoney((int)x.ByteValue);
}
// Implicit conversion from SqlByte to SqlMoney
///
/// [To be supplied.]
///
public static implicit operator SqlMoney(SqlByte x) {
return x.IsNull ? Null : new SqlMoney((int)x.Value);
}
// Implicit conversion from SqlInt16 to SqlMoney
///
/// [To be supplied.]
///
public static implicit operator SqlMoney(SqlInt16 x) {
return x.IsNull ? Null : new SqlMoney((int)x.Value);
}
// Implicit conversion from SqlInt32 to SqlMoney
///
/// [To be supplied.]
///
public static implicit operator SqlMoney(SqlInt32 x) {
return x.IsNull ? Null : new SqlMoney(x.Value);
}
// Implicit conversion from SqlInt64 to SqlMoney
///
/// [To be supplied.]
///
public static implicit operator SqlMoney(SqlInt64 x) {
return x.IsNull ? Null : new SqlMoney(x.Value);
}
// Explicit conversions
// Explicit conversion from SqlSingle to SqlMoney
///
/// [To be supplied.]
///
public static explicit operator SqlMoney(SqlSingle x) {
return x.IsNull ? Null : new SqlMoney((double)x.Value);
}
// Explicit conversion from SqlDouble to SqlMoney
///
/// [To be supplied.]
///
public static explicit operator SqlMoney(SqlDouble x) {
return x.IsNull ? Null : new SqlMoney(x.Value);
}
// Explicit conversion from SqlDecimal to SqlMoney
///
/// [To be supplied.]
///
public static explicit operator SqlMoney(SqlDecimal x) {
return x.IsNull ? SqlMoney.Null : new SqlMoney(x.Value);
}
// Explicit conversion from SqlString to SqlMoney
// Throws FormatException or OverflowException if necessary.
///
/// [To be supplied.]
///
public static explicit operator SqlMoney(SqlString x) {
return x.IsNull ? Null : new SqlMoney(Decimal.Parse(x.Value,NumberStyles.Currency,null));
}
// Builtin functions
// Overloading comparison operators
///
/// [To be supplied.]
///
public static SqlBoolean operator==(SqlMoney x, SqlMoney y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value == y.m_value);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator!=(SqlMoney x, SqlMoney y) {
return ! (x == y);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator<(SqlMoney x, SqlMoney y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value < y.m_value);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator>(SqlMoney x, SqlMoney y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value > y.m_value);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator<=(SqlMoney x, SqlMoney y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value <= y.m_value);
}
///
/// [To be supplied.]
///
public static SqlBoolean operator>=(SqlMoney x, SqlMoney y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value >= y.m_value);
}
//--------------------------------------------------
// Alternative methods for overloaded operators
//--------------------------------------------------
// Alternative method for operator +
public static SqlMoney Add(SqlMoney x, SqlMoney y) {
return x + y;
}
// Alternative method for operator -
public static SqlMoney Subtract(SqlMoney x, SqlMoney y) {
return x - y;
}
// Alternative method for operator *
public static SqlMoney Multiply(SqlMoney x, SqlMoney y) {
return x * y;
}
// Alternative method for operator /
public static SqlMoney Divide(SqlMoney x, SqlMoney y) {
return x / y;
}
// Alternative method for operator ==
public static SqlBoolean Equals(SqlMoney x, SqlMoney y) {
return (x == y);
}
// Alternative method for operator !=
public static SqlBoolean NotEquals(SqlMoney x, SqlMoney y) {
return (x != y);
}
// Alternative method for operator <
public static SqlBoolean LessThan(SqlMoney x, SqlMoney y) {
return (x < y);
}
// Alternative method for operator >
public static SqlBoolean GreaterThan(SqlMoney x, SqlMoney y) {
return (x > y);
}
// Alternative method for operator <=
public static SqlBoolean LessThanOrEqual(SqlMoney x, SqlMoney y) {
return (x <= y);
}
// Alternative method for operator >=
public static SqlBoolean GreaterThanOrEqual(SqlMoney x, SqlMoney y) {
return (x >= y);
}
// Alternative method for conversions.
public SqlBoolean ToSqlBoolean() {
return (SqlBoolean)this;
}
public SqlByte ToSqlByte() {
return (SqlByte)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 SqlDecimal ToSqlDecimal() {
return (SqlDecimal)this;
}
public SqlSingle ToSqlSingle() {
return (SqlSingle)this;
}
public SqlString ToSqlString() {
return (SqlString)this;
}
// 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 SqlMoney) {
SqlMoney i = (SqlMoney)value;
return CompareTo(i);
}
throw ADP.WrongType(value.GetType(), typeof(SqlMoney));
}
public int CompareTo(SqlMoney 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 SqlMoney)) {
return false;
}
SqlMoney i = (SqlMoney)value;
if (i.IsNull || IsNull)
return (i.IsNull && IsNull);
else
return (this == i).Value;
}
// For hashing purpose
///
/// [To be supplied.]
///
public override int GetHashCode() {
// Don't use Value property, because Value will convert to Decimal, which is not necessary.
return IsNull ? 0 : m_value.GetHashCode();
}
///
/// [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)) {
this.m_fNotNull = false;
}
else {
SqlMoney money = new SqlMoney(XmlConvert.ToDecimal(reader.ReadElementString()));
this.m_fNotNull = money.m_fNotNull;
this.m_value = money.m_value;
}
}
///
/// [To be supplied.]
///
void IXmlSerializable.WriteXml(XmlWriter writer) {
if (IsNull) {
writer.WriteAttributeString("xsi", "nil", XmlSchema.InstanceNamespace, "true");
}
else {
writer.WriteString( XmlConvert.ToString(ToDecimal()) );
}
}
///
/// [To be supplied.]
///
public static XmlQualifiedName GetXsdType(XmlSchemaSet schemaSet) {
return new XmlQualifiedName("decimal", XmlSchema.Namespace);
}
///
///
/// Represents a null value that can be assigned to
/// the
///
public static readonly SqlMoney Null = new SqlMoney(true);
///
///
/// Represents the zero value that can be assigned to the
///
public static readonly SqlMoney Zero = new SqlMoney(0);
///
///
/// Represents the minimum value that can be assigned
/// to
///
public static readonly SqlMoney MinValue = new SqlMoney(unchecked((long)0x8000000000000000L), 0);
///
///
/// Represents the maximum value that can be assigned to
/// the
///
public static readonly SqlMoney MaxValue = new SqlMoney(0x7FFFFFFFFFFFFFFFL, 0);
} // SqlMoney
} // namespace System.Data.SqlTypes
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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