MySQL 使用 LOOP 的 ITERATE 语句示例

介绍 MySQL 的 Iterate 迭代语句 MySQL mysqlmysqlmysql DELIMITER //mysql CREATE PROCEDURE myProc (IN in_count INT) - BEGIN - DECLARE count INT default 0; - - increment: LOOP - SET count = count + 1; - IF count 20 THEN ITERATE increment; END I

介绍 MySQL 的 Iterate 迭代语句
MySQL

mysql>
mysql>
mysql> DELIMITER //
mysql> CREATE PROCEDURE myProc (IN in_count INT)
    -> BEGIN
    ->     DECLARE count INT default 0;
    ->
    ->     increment: LOOP
    ->     SET count = count + 1;
    ->     IF count < 20 THEN ITERATE increment; END IF;
    ->     IF count > in_count THEN LEAVE increment;
    ->     END IF;
    ->     END LOOP increment;
    ->
    ->     SELECT count;
    -> END
    -> //
Query OK, 0 rows affected (0.00 sec)

mysql> DELIMITER ;
mysql>
mysql> call myProc(5);
+-------+
| count |
+-------+
|    20 |
+-------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)

mysql>