MySQL导出所有Index 和 约束

工作需要，记录一下。

1. 导出创建自增字段语句：

SELECT
CONCAT(
'ALTER TABLE `',
TABLE_NAME,
'` ',
'MODIFY COLUMN `',
COLUMN_NAME,
'` ',
IF(UPPER(DATA_TYPE) = 'INT',
REPLACE(
SUBSTRING_INDEX(
UPPER(COLUMN_TYPE),
')',
1
),
'INT',
'INTEGER'
),
UPPER(COLUMN_TYPE)
),
') UNSIGNED NOT NULL AUTO_INCREMENT;'
)
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'source_database_name' AND
EXTRA = UPPER('AUTO_INCREMENT')
ORDER BY TABLE_NAME ASC

2. 导出所有索引

SELECT
CONCAT('ALTER TABLE `',TABLE_NAME,'` ', 'ADD ', 
	IF(NON_UNIQUE = 1,
		CASE UPPER(INDEX_TYPE)
		WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX'
		WHEN 'SPATIAL' THEN 'SPATIAL INDEX'
		ELSE CONCAT('INDEX `',
			INDEX_NAME,
			'` USING ',
			INDEX_TYPE
		)
END,
IF(UPPER(INDEX_NAME) = 'PRIMARY',
	CONCAT('PRIMARY KEY USING ',
		INDEX_TYPE
	),
CONCAT('UNIQUE INDEX `',
	INDEX_NAME,
	'` USING ',
	INDEX_TYPE
)
)
),'(', GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`') ORDER BY SEQ_IN_INDEX ASC SEPARATOR ', '), ');') AS 'Show_Add_Indexes'
FROM information_schema.STATISTICS
WHERE TABLE_SCHEMA = 'pbq'
GROUP BY TABLE_NAME, INDEX_NAME
ORDER BY TABLE_NAME ASC, INDEX_NAME ASC

3. 创建删除所有自增字段

SELECT
CONCAT(
'ALTER TABLE `',
TABLE_NAME,
'` ',
'MODIFY COLUMN `',
COLUMN_NAME,
'` ',
IF(UPPER(DATA_TYPE) = 'INT',
REPLACE(
SUBSTRING_INDEX(
UPPER(COLUMN_TYPE),
')',
1
),
'INT',
'INTEGER'
),
UPPER(COLUMN_TYPE)
),
') UNSIGNED NOT NULL;'
)
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'destination_database_name' AND
EXTRA = UPPER('AUTO_INCREMENT')
ORDER BY TABLE_NAME ASC

4. 删除库所有索引

SELECT
CONCAT(
'ALTER TABLE `',
TABLE_NAME,
'` ',
GROUP_CONCAT(
DISTINCT
CONCAT(
'DROP ',
IF(UPPER(INDEX_NAME) = 'PRIMARY',
'PRIMARY KEY',
CONCAT('INDEX `', INDEX_NAME, '`')
)
)
SEPARATOR ', '
),
';'
)
FROM information_schema.STATISTICS
WHERE TABLE_SCHEMA = 'destination_database_name'
GROUP BY TABLE_NAME
ORDER BY TABLE_NAME ASC