Delphi OLEDB ErrorCode

在使用 OLEDB 發生錯誤時，可以用 ErrorCode 來做錯誤處理
ErrorCode 定義在 Unit OleDB 中

//  Invalid accessor
//
  DB_E_BADACCESSORHANDLE               = HResult($80040E00);
...
//  Unable to write with a read-only accessor
//
  DB_E_READONLYACCESSOR                = HResult($80040E02);
...
//  Given values violate the database schema
//
  DB_E_SCHEMAVIOLATION                 = HResult($80040E03);
...
//  A literal value in the command could not be converted to the
//  correct type due to a reason other than data overflow
//
  DB_E_CANTCONVERTVALUE                = HResult($80040E07);
...
//  The command contained one or more errors
//
  DB_E_ERRORSINCOMMAND                 = HResult($80040E14);
...
//  A specified value violated the integrity constraints for a column or
//  table
//
  DB_E_INTEGRITYVIOLATION              = HResult($80040E2F);
...