public static DbValue FORMAT(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "FORMAT";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
if (Types.IsNullValue(arg1))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.DATETIME)
{
args.Expected(FunctionName, 0, "input DATETIME, got " + arg1type.Name.ToUpper());
}
string formatstr = tools.GetString(arg0).ToString();
DateTime dt = tools.GetDateTime(arg1);
mstring result = mstring.Prepare(dt.ToString(formatstr));
while (result.Length < 80)
{
result.MAppend('\0');
}
return(tools.AllocValue(result));
}