mysql存储过程循环修改每一条数据

原创于 2016-04-07 18:02:17 发布 · 7.8k 阅读

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#mysql存储过程 #存储过程循环

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本文介绍了一个用于修复不一致疾病数据记录的存储过程。该过程通过检查疾病记录中看医生的状态与消息字段的一致性来更新数据库表。当看医生的消息存在但状态未正确设置时，将自动修正这些条目的状态。

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DELIMITER $$
USE `health`$$
DROP PROCEDURE IF EXISTS `repairDiseaseData`$$
CREATE DEFINER=`root`@`%` PROCEDURE `repairDiseaseData`()
BEGIN
      DECLARE Done INT DEFAULT 0;
      DECLARE isSeeDoctor INT;
	  DECLARE dId INT;
      DECLARE seeDoctorMsg LONGTEXT;
      DECLARE rs CURSOR FOR 
	  SELECT	id,	is_see_doctor,	see_doctor_msg
	  FROM	t_disease
	  WHERE
		(
		 (is_see_doctor = 0	OR is_see_doctor IS NULL)
			 AND see_doctor_msg IS NOT NULL AND see_doctor_msg != ''
		)
	  OR (is_see_doctor = 1	AND (see_doctor_msg IS NULL OR see_doctor_msg = ''));
      DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET Done = 1;
      OPEN rs;  
	  FETCH NEXT FROM rs INTO dId, isSeeDoctor, seeDoctorMsg;     
      REPEAT
        IF NOT Done THEN
            IF seeDoctorMsg is null or seeDoctorMsg = ''
			THEN
                UPDATE t_disease SET is_see_doctor = 0 WHERE id = dId;
            ELSE               
                UPDATE t_disease SET is_see_doctor = 1 WHERE id = dId;
            END IF;
        END IF;
        FETCH NEXT FROM rs INTO dId, isSeeDoctor, seeDoctorMsg;   
      UNTIL Done END REPEAT;
	  CLOSE rs;
END$$
DELIMITER ;
CALL repairDiseaseData();