MySQL provides us with a LOOP statement, which can repeatedly execute blocks of code and adds flexibility in using loop labels. We have the following two statements that allow us to control the loop -
It allows us to exit the loop immediately without waiting for the check
It allows us to skip the entire code underneath it and start a new iteration.
Demonstrates the use of the LOOP statement with a stored procedure. The following is a stored procedure that constructs a string with even numbers, such as 2, 4, 6, 8, etc. -
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
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Now, when we call this procedure, we can see the following results -
1 2 3 4 5 6 7 8 9 |
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In the above query, if the value of A is greater than 10, the loop occurs due to the LEAVE statement And terminate. If the value of A is odd, the ITERATE statement ignores everything below it and starts a new iteration. If the value of A is an even number, the block in the ELSE statement will build the string using the even number.
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