MySQL存储结构用法案例分析

DROP TABLE IF EXISTS student1;
CREATE TABLE student1 (
id INT NOT NULL auto_increment,
name TEXT,
age INT,
PRIMARY KEY(id)
);

DROP TABLE IF EXISTS student2;
CREATE TABLE student2 (
id INT NOT NULL auto_increment,
name TEXT,
age INT,
PRIMARY KEY(id)
);

INSERT INTO student1 (name, age) VALUES ('xiaoming', 18);
INSERT INTO student1 (name, age) VALUES ('xiaohong', 17);
INSERT INTO student1 (name, age) VALUES ('xiaogang', 19);
INSERT INTO student1 (name, age) VALUES ('xiaoyu', 18);
INSERT INTO student1 (name, age) VALUES ('xiaohua', 20);

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DROP PROCEDURE IF EXISTS test_pro1;
---------------------------------------------------------------
DELIMITER &&
CREATE PROCEDURE test_pro1()
BEGIN
 set @sentence = 'select * from student1 where age<19;';
 prepare stmt from @sentence;
 execute stmt;
 deallocate prepare stmt;
END &&
DELIMITER ;

---------------------------------------------------------------
DROP PROCEDURE IF EXISTS test_pro2;
---------------------------------------------------------------
DELIMITER &&
create procedure test_pro2()
begin
  DECLARE stop_flag INT DEFAULT 0;
  DECLARE s_name TEXT default '';
  DECLARE s_age INT default 0;
  DECLARE cur1 CURSOR FOR (select name, age from student1 where age<19);
    DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET stop_flag=1;
  open cur1;
    fetch cur1 into s_name, s_age;
  while stop_flag<>1 DO
    insert into student2(name, age) values(s_name, s_age);
    fetch cur1 into s_name, s_age;
  end while;
  close cur1;
end &&
DELIMITER ;

---------------------------------------------------------------
DROP PROCEDURE IF EXISTS test_pro3;
---------------------------------------------------------------
DELIMITER &&
create procedure test_pro3(IN p_age INT)
begin
  DECLARE stop_flag INT DEFAULT 0;
  DECLARE s_name TEXT default '';
  DECLARE s_age INT default 0;
  DECLARE cur1 CURSOR FOR (select name, age from student1 where age<p_age);
    DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET stop_flag=1;
  open cur1;
    fetch cur1 into s_name, s_age;
  while stop_flag<>1 DO
    insert into student2(name, age) values(s_name, s_age);
    fetch cur1 into s_name, s_age;
  end while;
  close cur1;
end &&
DELIMITER ;

call test_pro1();

call test_pro1(123);