CREATE PROCEDURE p2 (IN parameter1 INT) BEGIN DECLARE variable1 INT; SET variable1 = parameter1 + 1; CASE variable1 WHEN 0 THEN INSERT INTO t VALUES (17); WHEN 1 THEN INSERT INTO t VALUES (18); ELSE INSERT INTO t VALUES (19); END CASE; END; // 循环语句 WHILE … END WHILE LOO...
SET:赋值语句,用于对变量进行赋值 SELECT…INTO:把从数据表中查询的结果存放到变量中,也就是为变量赋值 需要设置新的结束标记。 DELIMITER 新的结束标记 # 示例 DELIMITER $ CREATEPROCEDURE存储过程名(IN|OUT|INOUT参数名 参数类型,...) [characteristics ...] BEGIN sql语句1; sql语句2; END$ DELIMITER ; M...
1SET 变量名 = 表达式值 [,variable_name = expression ...] 5.3、用户变量 在MySQL客户端使用用户变量: 1mysql > SELECT'Hello World'into @x;2mysql >SELECT @x;3+---+4| @x |5+---+6| Hello World |7+---+8mysql > SET @y='Goodbye Cruel World';9mysql >SELECT @y;10+---+11| @...
Following statements create a stored procedure. By default, a procedure is associated with the default database (currently used database). To associate the procedure with a given database, specify the name as database_name.stored_procedure_name when you create it. Here is the complete syntax :...
For example, my stored procedure is as follows create procedure get_data(IN id int) begin declare filename varchar(10) default concat(id, ".txt"); select name, address from table where id_in_table = id INTO outfile @filename; end; This code (or any of the other variants th...
INTO variable .. within Stored Procedure crashes the server Submitted: 18 Jan 2005 18:37Modified: 18 Feb 2005 18:04 Reporter: Alexander Keremidarski Email Updates: Status: Closed Impact on me: None Category: MySQL ServerSeverity: S3 (Non-critical) Version: 5.0OS: Any (any) Assigned to...
mysql>delimiter$$#将语句的结束符号从分号;临时改为两个$$(可以是自定义)mysql>CREATEPROCEDUREdelete_matches(INp_playernoINTEGER)->BEGIN->DELETEFROMMATCHES->WHEREplayerno=p_playerno; ->END$$QueryOK,0rowsaffected(0.01sec)mysql>delimiter;#将语句的结束符号恢复为分号 ...
存储过程(Stored Procedure)是在大型数据库系统中,一组为了完成特定功能的SQL 语句集,存储在数据库中经过第一次编译后再次调用不需要再次编译,用户通过指定存储过程的名字并给出参数(如果该存储过程带有参数)来执行它。存储过程是数据库中的一个重要对象,任何一个设计良好的数据库应用程序都应该用到存储过程。
标准SQLSTATE值或者它可以是SQLWARNING,NOTFOUND或SQLEXCEPTION条件,这是SQLSTATE值类的简写。NOTFOUND条件用于游标或SELECT INTO variable_list语句。 与MySQL错误代码或SQLSTATE值相关联的命名条件。 最重要的是,上述sql可以是一个简单的语句或由BEGIN和END关键字包围的复合语句。介绍完事之后,咱们来看几个声明处理程序...
To assign other value to a variable you can use SET statement, for example: DECLARE total_count INT DEFAULT 0 SET total_count = 10; The total_count variable’s value now is ten (10). Beside SET statement, we can use SELECT … INTO to assign a query result to a variable. ...