Variables, Loops and Cursors Used in Stored Procedures

MySQL Tutorials - Herong's Tutorial Examples - Version 4.20, by Dr. Herong Yang

MySQL Tutorials - Herong's Tutorial Examples

∟Variables, Loops and Cursors Used in Stored Procedures

This chapter provides tutorial notes on store procedures. Topics include declaring variables and assigning values to variables; IF statements; LOOP, REPEAT and WHILE statements; ITERATE and LEAVE statements; Using cursors to loop through output rows of SELECT statements.

Local Variables in Stored Procedures

Execution Flow Control Statements

ITERATE and LEAVE - Statements to Break Loops

DECLARE ... CURSOR FOR Select Statements

Conclusion:

DECLARE and SET statements are used to declare and set local variables.
SELECT...INTO statements are used to assign SELECT output into local variables.
IF...THEN statements are used to execute statement blocks selectively under logical conditions.
LOOP, REPEAT and WHILE statements are used to execute statement blocks repeatedly in loops.
ITERATE and LEAVE statements are used to break execution loops.
DECLARE...CURSOR FOR statements are used to declare cursors with associated SELECT statements.
OPEN and CLOSE statements are used to open and close cursors.
FETCH...INTO statements are used to fetch the next output row from open cursors into local variables.

All notes and examples in chapter are tested with MySQL 5.7, 5.6, 5.0 and 4.0 servers.

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