mysql 动态cursor,mysql动态游标学习(mysql存储过程游标)

代码如下:

-- 建立测试表和数据

create table webuser (username varchar(10));

insert into webuser values ('a1'),('a2'),('a3'),('b1'),('b2'),('b3');

commit;

-- 建立存储过程

drop procedure if exists dynamic_cursor;

delimiter //

CREATE PROCEDURE dynamic_cursor (IN p_name varchar(10))

BEGIN

DECLARE done INT DEFAULT 0;

DECLARE v_username varchar(10);

DECLARE cur CURSOR for( SELECT username from webuser_view);

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

DROP VIEW IF EXISTS webuser_view;

SET @sqlstr = "CREATE VIEW webuser_view as ";

SET @sqlstr = CONCAT(@sqlstr , "SELECT username FROM webuser WHERE username like '", p_name,"%'");

PREPARE stmt FROM @sqlstr;

EXECUTE stmt;

DEALLOCATE PREPARE stmt;

OPEN cur;

f_loop:LOOP

FETCH cur INTO v_username;

IF done THEN

LEAVE f_loop;

END IF;

SELECT v_username;

END LOOP f_loop;

CLOSE cur;

END;

//

delimiter ;

-- 测试

call dynamic_cursor('a');