MySQL导出所有Index和约束的方法

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

导出删除某张表的外键

	SELECT
	  CONCAT('ALTER TABLE ', TABLE_SCHEMA, '.', TABLE_NAME, ' DROP FOREIGN KEY ', CONSTRAINT_NAME, ' ;'),
	  TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME
	FROM
	  INFORMATION_SCHEMA.KEY_COLUMN_USAGE
	WHERE
	  REFERENCED_TABLE_SCHEMA = '数据库名称' AND
	  REFERENCED_TABLE_NAME = '表名';

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;

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;

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

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