MySQL stored procedures provide two loop statements: WHILE and REPEAT: WHILE loop: Repeat the code block according to the condition, and continue execution when the condition is true. REPEAT loop: execute the code block first, then check whether the condition is true, if it is false, execute the code block again.
Loop statements in MySQL stored procedures
MySQL stored procedures support the following two types of loop statements:
WHILE Loop
WHILE loop repeatedly executes a block of code based on specified conditions. The syntax is:
<code class="sql">WHILE condition DO -- 代码块 END WHILE;</code>
Among them:
condition
: The condition of the loop. When the condition is true, the code block will continue to execute. -- Code block
: Code block to be executed repeatedly. REPEAT Loop
The REPEAT loop first executes the block of code and then checks whether the condition is true. If true, the loop ends; if false, the code block is executed again. The syntax is:
<code class="sql">REPEAT -- 代码块 UNTIL condition;</code>
where:
-- Code block
: Code block to be executed repeatedly. condition
: The condition of the loop. When the condition is true, the loop ends. Application of loop statements
Loop statements are widely used in stored procedures, including:
Choose appropriate loop statements
When choosing a loop statement, the following factors should be considered:
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