mysql动态游标学习
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\');
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