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[Source] Mysql table fields and variables are consistent workarounds

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Posted on 7/21/2016 10:22:23 AM | | | |


Stored procedure FileExist1:



Stored procedure FileExist2:





The execution result is as follows:

FileExist1 returns 8 pieces of data, FileExist2 returns 0 pieces of data,

Why does FileExist1 return 8 entries????? Because there are a total of 8 records in the table record, WHERE SHA1=SHA1 can be understood as where 1=1 is always true.

The solution to the consistency between table fields and variable names is to write in FileExist2:


Add the name of the table in front!






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