Cursor declarations must appear before handler declarations and after variable and condition declarations. A stored program may contain multiple cursor declarations, but each cursor declared in a given block must have a unique name. For an example, see Section 13.
Below is a function that uses this cursor. Use variable when declaring cursor. MySQL Cursor with a variable in select. How to declare a variable in MySQL? Declare a user-defined variable 2. Let’s start with looking at all of them one by one.
There are primarily three types of variables in MySQL. And each has its specific way to provide a declaration. The finished is a variable to indicate that the cursor has reached the end of the result set. Notice that the handler declaration must appear after variable and cursor declaration inside the stored procedures. The variable can be referred to in blocks nested within the declaring block, except those blocks that declare a variable with the same name.
For examples of variable declarations, see Section 13. Local Variable Scope and Resolution”. Using cursors involves several distinct steps: Before a cursor can be used it must be declared (defined).
DECLARE curCURSOR FOR SELECT i FROM test. Otherwise, a local variable is NULL. The operations are made after the declarations, by aknowledging the existing, declared local variables.
