在上面的示例中,我们首先创建了一个名为loop_example的存储过程。在存储过程内部,我们定义了一个变量i,并将其初始化为1。然后,我们使用LOOP循环输出变量i的值,并将i的值加1。当i的值大于10时,我们使用LEAVE语句跳出循环。 你可以通过调用存储过程loop_example()来运行这段代码。运行结果将是1到10之间的整数。
DELIMITER $$DROP PROCEDURE IF EXISTS `sp_test_while`$$CREATE PROCEDURE `sp_test_while`( IN p_number INT, #要循环的次数 IN p_startid INT #循环的其实值 )BEGIN DECLARE v_val INT DEFAULT 0; SET v_val=p_startid; outer_label: BEGIN #设置一个标记WHILE v_val<=p_number DO SET v_val...
Here is an example of using theWHILEloop statement in stored procedure: DELIMITER $$ DROP PROCEDURE IF EXISTS WhileLoopProc$$ CREATE PROCEDURE WhileLoopProc() BEGIN DECLARE x INT; DECLARE str VARCHAR(255); SET x = 1; SET str = ''; WHILE x <= 5 DO SET str = CONCAT(str,x,',');...
The WHILE loop is called pretest loop because it checks the expression before the statements execute. Here is an example of using the WHILE loop statement in stored procedure: DELIMITER $$ DROP PROCEDURE IF EXISTS WhileLoopProc$$ CREATE PROCEDURE WhileLoopProc() BEGIN DECLARE x INT; DECLARE ...
CREATE procedure test () BEGIN WHILE false DO SET @a = 4; END WHILE; END; The dubious error I get is: [MySQL][ODBC 5.1 Driver][mysqld-5.1.33-community]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use...
Introduction to MySQL stored procedures. Tutorial on MySQL procedure syntax, delimiter, tools to create procedure, characteristics clauses, variables, compound statements, label, declare, if, repeat, loop, return, while statement and cursor.
Bug #12257 SELECT * inside PROCEDURE gives "Unknown column" on second loop if tbl changed Submitted: 29 Jul 2005 2:53Modified: 20 Jun 2012 16:53 Reporter: Sergey Petrunya Email Updates: Status: Closed Impact on me: None Category: MySQL Server: Stored RoutinesSeverity: S3 (Non-critical...
MySQL offers a changeUser command that allows you to alter the current user and other aspects of the connection without shutting down the underlying socket: connection.changeUser({user : 'john'}, function(err) { if (err) throw err; }); The available options for this feature are: user: ...
For more information, see Section 17.6.3.6, “Moving Tablespace Files While the Server is Offline”. innodb_disable_sort_file_cache Command-Line Format --innodb-disable-sort-file-cache[={OFF|ON}] System Variable innodb_disable_sort_file_cache Scope Global Dynamic Yes SET_VAR Hint Applies ...
In most cases, a hash join is more efficient than the block-nested loop algorithm previously used for equi-joins without indexes. By default, beginning with this release, a hash join is used whenever a join includes at least one equi-join condition, and no indexes can be applied to the...