I fixed NXG on NI Package Manager，like this.
But,it doesn't work.
Furthermore，i find that the build-in examples work well , but when i copy the example to my new VI project, the problem occour. And when in the build-in example , the deleted data works well，but in my new VI project, i will see the problem.
Umm... Very strange behavior...
I looked for the source and found here.
C:\Program Files\National Instruments\LabVIEW NXG 4.0\Addons\NI\G\databaseconnectivity-src\184.108.40.206
I guess file path might be root cause but no confidence...
When create new project in non Chinese named path, do you see the behavior...?
Thanks for your advice.
But it has nothing to do with file path,I create new project in non Chinese named path, the problem can't be solved.
Actually，I saved the build-in example on my desk and its file path includes ,
and then, i deleted all the program and wrote a simple program on the example project with delete data fuction , strange thing happened, it works very well, the problem disappered.
But i don't know what happened to my new created project, i think there is no different between new project and example project which has been deleted all the program.