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When getting the value in the database, the database has a value, but it is empty??

2022-04-22 14:05:00 【CSDN Q & A】

When getting the value in the database , The database has values , The returned value is empty , Why? ？
The code part is as follows ：

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Take the answer ：

It seems that there is something wrong with your database query statement , It seems that the outside of the variable needs to be enclosed in curly braces , You try it

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