internal static bool TryWriteX(Type tAccessor, DataSet db, DbCommand cmd, out int rslt, System.Linq.Expressions.Expression <Func <DataSet, DbCommand, int> > handlerExpr)
{
System.Linq.Expressions.MethodCallExpression methodCallExpr = (System.Linq.Expressions.MethodCallExpression)handlerExpr.Body;
string handlerMethodName = methodCallExpr.Method.Name;
HandlerExecDesc handler;
if (!s_map_CommandText_Exec_Method.TryGetValue(cmd.CommandText, out handler))
{
// not registered
IComparable handlerCommandText = GetCommandTextImpl(tAccessor, handlerMethodName);
//string handlerCommandText = gct(handlerMethodName);// RepositoryDML_CommandText.RepositoryDML_GetCommandTextDML(handlerMethodName);
string handlerCommandTextX = handlerCommandText as string;
bool isOk;
if (handlerCommandTextX == null)
{
isOk = handlerCommandText.CompareTo(cmd) == 0;
}
else
{
isOk = string.Equals(cmd.CommandText, handlerCommandTextX, StringComparison.Ordinal);
}
if (isOk)
{
var parameter_db = Expression.Parameter(typeof(DataSet), "db");
var parameter_cmd = Expression.Parameter(typeof(DbCommand), "cmd");
MethodCallExpression call = Expression.Call(methodCallExpr.Method, parameter_db, parameter_cmd); // methodCallExpr.Arguments
Expression <Func <DataSet, DbCommand, int> > lambda = Expression.Lambda <Func <DataSet, DbCommand, int> >(call, parameter_db, parameter_cmd); // visitor.ExtractedParameters
Func <DataSet, DbCommand, int> handlerMethod = lambda.Compile();
handler = new HandlerExecDesc(handlerMethodName, handlerMethod);
s_map_CommandText_Exec_Method.Add(cmd.CommandText, handler);
}
else
{
handler = null;
}
}
else
{
// registered
}
if (handler != null && handler.MethodName == handlerMethodName)
{
rslt = handler.HandlerMethod(db, cmd);
return(true);
}
rslt = 0;
return(false);
}
internal static Func <DataSet, DbCommand, int> TryWrite(CommandExecutionHandler handlerRegistry, DbCommand cmd)
{
HandlerExecDesc handler;
if (!s_map_CommandText_Exec_Method.TryGetValue(cmd.CommandText, out handler))
{
// not yet cached
IComparable handlerCommandText = handlerRegistry.RetrieveCommandText();// GetCommandTextImpl(tAccessor, handlerMethodName);
string handlerCommandTextX = handlerCommandText as string;
bool isOk;
if (handlerCommandTextX == null)
{
isOk = handlerCommandText.CompareTo(cmd) == 0;
}
else
{
isOk = string.Equals(cmd.CommandText, handlerCommandTextX, StringComparison.Ordinal);
}
if (isOk)
{
Func <DataSet, DbCommand, int> handlerMethod = handlerRegistry.DoCompileExecMethod();
handler = new HandlerExecDesc(handlerRegistry.RetrieveHandlerMethodName(), handlerMethod);
s_map_CommandText_Exec_Method.Add(cmd.CommandText, handler);
}
else
{
handler = null;
}
}
else
{
// registered
}
if (handler != null && handler.MethodName == handlerRegistry.RetrieveHandlerMethodName())
{
return(handler.HandlerMethod);
}
return(null);
}
