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MySQL利用LOOP循环语句实现存储的方法教程

程序员文章站 2022-05-26 19:39:27
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MySQL存储过程的语句中有三个标准的循环方式:WHILE循环,LOOP循环以及REPEAT循环。还有一种非标准的循环方式:GOTO,不过这种循环方式最好别用,很容易引起程序的混乱,在这里就不错具体介绍了。 今天我们先来看看LOOP循环 mysql mysql delimiter $$ mysql

MySQL存储过程的语句中有三个标准的循环方式:WHILE循环,,LOOP循环以及REPEAT循环。还有一种非标准的循环方式:GOTO,不过这种循环方式最好别用,很容易引起程序的混乱,在这里就不错具体介绍了。

今天我们先来看看LOOP循环

mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
-> BEGIN
->
-> DECLARE i int;
-> SET i=0;
-> loop1: LOOP
-> SET i=i+1;
-> IF i>=10 THEN /*Last number - exit loop*/
-> LEAVE loop1;
-> ELSEIF MOD(i,2)=0 THEN /*Even number - try again*/
-> ITERATE loop1;
-> END IF;
->
-> SELECT CONCAT(i," is an odd number");
->
-> END LOOP loop1;
->
->
-> END$$
Query OK, 0 rows affected (0.02 sec)

mysql>
mysql> delimiter ;
mysql> call myProc();
+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 1 is an odd number |
+-------------------------------+
1 row in set (0.00 sec)

+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 3 is an odd number |
+-------------------------------+
1 row in set (0.00 sec)

+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 5 is an odd number |
+-------------------------------+
1 row in set (0.00 sec)

+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 7 is an odd number |
+-------------------------------+
1 row in set (0.01 sec)

+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 9 is an odd number |
+-------------------------------+
1 row in set (0.01 sec)

Query OK, 0 rows affected (0.01 sec)

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

mysql>