存储过程的使用

-- ----------------------------
-- Function structure for `currval`
-- ----------------------------
DROP FUNCTION IF EXISTS `currval`;
DELIMITER ;;
CREATE FUNCTION `currval`(seq_name varchar(50)) RETURNS bigint(20)
BEGIN
  DECLARE value bigint;

  SET value = 0;
  SELECT
    currentvalue INTO value
  FROM quartz_sequence
  WHERE name = seq_name;
  RETURN value;
END
;;
DELIMITER ;

-- ----------------------------
-- Function structure for `nextval`
-- ----------------------------
DROP FUNCTION IF EXISTS `nextval`;
DELIMITER ;;
CREATE FUNCTION `nextval`(seq_name varchar(50)) RETURNS bigint(20)
BEGIN
  UPDATE quartz_sequence
  SET currentvalue = currentvalue + increment
  WHERE name = seq_name;
  RETURN currval(seq_name);
END
;;
DELIMITER ;


SHOW FUNCTION STATUS;
SHOW CREATE FUNCTION nextval;
SHOW CREATE FUNCTION currval;
DESC o_sequence;
+--------------+-------------+------+-----+---------+-------+
| Field        | Type        | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| name         | varchar(50) | NO   | PRI | NULL    |       |
| currentvalue | bigint(20)  | NO   |     | NULL    |       |
| increment    | int(11)     | NO   |     | NULL    |       |
+--------------+-------------+------+-----+---------+-------+



CREATE DEFINER=`root`@`localhost` FUNCTION `nextval`(seq_name varchar(50)) RETURNS bigint(20)
BEGIN
  UPDATE o_sequence
  SET currentvalue = currentvalue + increment
  WHERE name = seq_name;
  RETURN currval(seq_name);
END


CREATE DEFINER=`root`@`localhost` FUNCTION `currval`(seq_name varchar(50)) RETURNS bigint(20)
BEGIN
  DECLARE value bigint;

  SET value = 0;
  SELECT
    currentvalue INTO value
  FROM o_sequence
  WHERE name = seq_name;
  RETURN value;
END


mybatis中调用存储过程
<select id="getOsid" resultClass="string">
		select nextval('osid') as osid
</select>

存储过程：提供给QA调用修改数据库数据
<select id="updateData" parameterClass="string"
  resultClass="int">
  call freesql(#date#)
</select>

CREATE <a target=_blank href="mailto:DEFINER=`root`@`localhost">DEFINER=`root`@`localhost</a>` PROCEDURE `freesql`(sqltext varchar(4000))
BEGIN
  SET @sql = sqltext;
  PREPARE stmt FROM @sql;
  EXECUTE stmt;
END

上面其实是实现了一个函数。