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• 前端之家
• MsSQL
• SQL2005CLR函数扩展-深入环比计算的详解

<div class="codebody" id="code35136">
using System;
using System.Data;
using System.Data.sqlClient;
using System.Data.sqlTypes;
using Microsoft.sqlServer.Server; public partial class UserDefinedFunctions
{ // 保存当前组当前值
private static System.Collections.Generic.Dictionary <string,SqlString > _listValue = new System.Collections.Generic.Dictionary <string,SqlString >();
// 保存当前组
private static System.Collections.Generic.Dictionary <string,string > _listGroup = new System.Collections.Generic.Dictionary <string,string >(); ///

/// 获取当前组上条记录数值
///

/// <param name="key"> 并发键
/// <param name="currentGroup"> 当前组
/// <param name="currentValue"> 当前组当前值
///
[Microsoft.sqlServer.Server.sqlFunction ]
public static sqlString GetPrevMemberValue(sqlString key,sqlString currentGroup,sqlString currentValue)
{
if (key.IsNull || currentGroup.IsNull) return sqlString .Null;
try
{
sqlString prevMemberValue = _listValue[key.Value]; // 组变更
if (_listGroup[key.Value] != currentGroup.Value)
{
prevMemberValue = sqlString .Null;
_listGroup[key.Value] = currentGroup.Value;
}
// 值变更
_listValue[key.Value] = currentValue; return prevMemberValue;
}
catch
{
return sqlString .Null;
}
}
///

/// 初始化并发键
///

/// <param name="key">
///
[Microsoft.sqlServer.Server.sqlFunction ]
public static sqlBoolean InitKey(sqlString key)
{
try
{
_listValue.Add(key.Value,sqlString .Null);
_listGroup.Add(key.Value,string .Empty);
return true ;
}
catch
{
return false ;
}
}
///

/// 释放并发键
///

/// <param name="key">
///
[Microsoft.sqlServer.Server.sqlFunction ]
public static sqlBoolean DisposeKey(sqlString key)
{
try
{
_listValue.Remove(key.Value);
_listGroup.Remove(key.Value);
return true ;
}
catch
{
return false ;
}
}
};