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这篇文章给大家介绍怎么在 Mysql 中动态更新数据库，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
动态删除索引
DROP PROCEDURE IF EXISTS UPGRADE;
DELIMITER $$
CREATE PROCEDURE UPGRADE()
BEGIN
-- RESOURCE.AUDIO_ATTRIBUTE
IF EXISTS(SELECT * FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA = RESOURCE AND TABLE_NAME = AUDIO_ATTRIBUTE AND INDEX_NAME = resource_publish_resource_id_index)
THEN
ALTER TABLE `AUDIO_ATTRIBUTE` DROP INDEX resource_publish_resource_id_index;
END IF;
END$$
DELIMITER ;
CALL UPGRADE();
DROP PROCEDURE IF EXISTS UPGRADE;动态添加字段
DROP PROCEDURE IF EXISTS UPGRADE;
DELIMITER $$
CREATE PROCEDURE UPGRADE()
BEGIN
-- HOMEWORK.HOMEWORK_QUESTION_GROUP.FROM_ID
IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = HOMEWORK AND TABLE_NAME = HOMEWORK_QUESTION_GROUP AND COLUMN_NAME = FROM_ID)
THEN
ALTER TABLE `HOMEWORK_QUESTION_GROUP` ADD COLUMN FROM_ID VARCHAR(50) NULL;
END IF;
-- HOMEWORK.HOMEWORK_QUESTION_GROUP.QUESTION_TYPE
IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = HOMEWORK AND TABLE_NAME = HOMEWORK_QUESTION_GROUP AND COLUMN_NAME = QUESTION_TYPE)
THEN
ALTER TABLE `HOMEWORK_QUESTION_GROUP` ADD COLUMN QUESTION_TYPE VARCHAR(50) NULL;
END IF;
-- HOMEWORK.HOMEWORK_QUESTION_GROUP.DIFFICULTY
IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = HOMEWORK AND TABLE_NAME = HOMEWORK_QUESTION_GROUP AND COLUMN_NAME = DIFFICULTY)
THEN
ALTER TABLE `HOMEWORK_QUESTION_GROUP` ADD COLUMN DIFFICULTY VARCHAR(50) NULL;
END IF;
END$$
DELIMITER ;
CALL UPGRADE();
DROP PROCEDURE IF EXISTS UPGRADE;关于怎么在 Mysql 中动态更新数据库就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。
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