如何将SELECT语句中的值存储在MySQL存储过程中的变量中？

Question

This may be a super easy question to answer, but I am unsure how to do this correctly.

Here is my query within the procedure:

SELECT COUNT(barcode) AS count FROM movieitems;

How do I store the return value of this statement (for example, the value in count is 5 ) into a variable? I want to be able to access the count value throughout the rest of my procedure.

Answer 1

在存储过程中执行以下操作：

SELECT COUNT(barcode) AS count into @myVar FROM movieitems;

Answer 2

SELECT @someVariable := COUNT(barcode) FROM movie ...

You can then use @someVariable in other queries. Eg

SELECT * FROM some_table WHERE some_field > @someVariable;

And you can also manipulate the variable using SET :

SET @someVariable = @someVariable + 1;