[FireDAC] [Comp] [] DS - 211. Always perform a operation on unidirectional dataset [fdquery1], as shown in the title, so suddenly, don't know what the problem is there, but does anyone know how to solve? Just learning FireDAC

CodePudding user response:

Want to get a solution to the problem or want to work well, another day for a post, a solution...

CodePudding user response:

One-way data sets, better performance, but limited operation, changing FDQuery to two-way data sets:
FDQuery1. FetchOptions. Unidirectional:=false;

CodePudding user response:

The

reference 1/f, 52150896 response:

want to obtain a solution to the problem or want to work well, another day for a post, a solution...

The same error message, and many times will cause for a different reason, in addition to the more specific error message, to eliminate errors, usually we need to make sure to cause the wrong places, such as: one line of code, a control property is set, and so on, and then to find the cause of the problem analysis, thus to solve,

Now that you have to solve, looking forward to your solution,