/// <summary>
/// 查询条件
/// </summary>
/// <param name="sqlTable">数据库表格操作工具</param>
/// <param name="sqlStream">SQL表达式流</param>
/// <param name="expression">查询条件表达式</param>
/// <param name="isCreatedIndex">是否已经创建查询索引</param>
/// <returns></returns>
internal static unsafe bool WriteWhere(fastCSharp.emit.sqlTable.sqlToolBase sqlTable, charStream sqlStream, Expression <Func <valueType, bool> > expression, ref bool isCreatedIndex)
{
if (expression == null)
{
return(true);
}
sqlStream.PrepLength(6);
sqlStream.UnsafeAddLength(6);
int length = sqlStream.Length;
bool logicConstantWhere = false;
keyValue <string, string> name = sqlTable.Client.GetWhere(expression, sqlStream, ref logicConstantWhere);
if (length == sqlStream.Length)
{
sqlStream.UnsafeFreeLength(6);
return(logicConstantWhere);
}
if (name.Key != null)
{
byte *where = (byte *)(sqlStream.Char + length);
*(uint *)(where - sizeof(uint)) = 'e' + (' ' << 16);
*(uint *)(where - sizeof(uint) * 2) = 'e' + ('r' << 16);
*(uint *)(where - sizeof(uint) * 3) = 'w' + ('h' << 16);
isCreatedIndex = true;
sqlTable.CreateIndex(name.Key, name.Value);
}
return(true);
}