MySQL导出所有Index和约束的方法

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所属分类:MySQL
摘要

这篇文章主要介绍了MySQL导出所有Index和约束的方法,非常实用的技巧,需要的朋友可以参考下

本文汇总了MySQL导出所有Index 和 约束的方法,提供给大家以方便大家查询使用。具体如下:

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

希望本文所述示例能够对大家有所帮助。

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