要从 MySQL 数据库获取约束列表，请使用以下语法 -
select *from information_schema.table_constraints where constraint_schema = 'yourDatabaseName';
在这里，我们将从数据库“business”中获取约束。以下是列出数据库“business”中所有表的约束的查询 -
Python操作Mysql实例代码教程
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本文介绍了Python操作MYSQL、执行SQL语句、获取结果集、遍历结果集、取得某个字段、获取表字段名、将图片插入数据库、执行事务等各种代码实例和详细介绍，代码居多，是一桌丰盛唯美的代码大餐。如果想查看在线版请访问：https://www.jb51.net/article/34102.htm
mysql> select * −> from information_schema.table_constraints −> where constraint_schema = 'business';
以下是显示所有约束的输出 -
+--------------------+-------------------+--------------------------+--------------+------------------------------+-----------------+ | CONSTRAINT_CATALOG | CONSTRAINT_SCHEMA | CONSTRAINT_NAME | TABLE_SCHEMA | TABLE_NAME | CONSTRAINT_TYPE | +--------------------+-------------------+--------------------------+--------------+------------------------------+-----------------+ | def | business | PRIMARY | business | primarytable | PRIMARY KEY | | def | business | PRIMARY | business | primarytable1 | PRIMARY KEY | | def | business | PRIMARY | business | autoincrementtable | PRIMARY KEY | | def | business | PRIMARY | business | demoauto | PRIMARY KEY | | def | business | PRIMARY | business | autoincrement | PRIMARY KEY | | def | business | PRIMARY | business | primarytabledemo | PRIMARY KEY | | def | business | PRIMARY | business | sequencedemo | PRIMARY KEY | | def | business | PRIMARY | business | updtable | PRIMARY KEY | | def | business | PRIMARY | business | transcationdemo | PRIMARY KEY | | def | business | PRIMARY | business | triggedemo | PRIMARY KEY | | def | business | PRIMARY | business | usernameandpassworddemo | PRIMARY KEY | | def | business | UserId | business | usernameandpassworddemo | UNIQUE | | def | business | PRIMARY | business | tblp | PRIMARY KEY | | def | business | name | business | uniquedemo | UNIQUE | | def | business | name | business | uniqueconstdemo | UNIQUE | | def | business | PRIMARY | business | keydemo | PRIMARY KEY | | def | business | PRIMARY | business | nextiddemo | PRIMARY KEY | | def | business | PRIMARY | business | tablepri | PRIMARY KEY | | def | business | ConstFK | business | tabledemo2 | UNIQUE | | def | business | ConstFK | business | tabledemo3 | UNIQUE | | def | business | PRIMARY | business | college | PRIMARY KEY | | def | business | id | business | uniquedemo1 | UNIQUE | | def | business | id | business | uniqueautoid | UNIQUE | | def | business | PRIMARY | business | schemadatabasemethoddemo | PRIMARY KEY | | def | business | PRIMARY | business | employeeinformation | PRIMARY KEY | | def | business | name | business | addingunique | UNIQUE | | def | business | PRIMARY | business | parentdemo | PRIMARY KEY | | def | business | PRIMARY | business | lastinsertrecordiddemo | PRIMARY KEY | | def | business | PRIMARY | business | demoindex | PRIMARY KEY | | def | business | PRIMARY | business | compositeprimarykey | PRIMARY KEY | | def | business | PRIMARY | business | addingautoincrement | PRIMARY KEY | | def | business | Id | business | uniqueconstrainttable | UNIQUE | | def | business | PRIMARY | business | mergedemo1 | PRIMARY KEY | | def | business | PRIMARY | business | mergedemo2 | PRIMARY KEY | | def | business | PRIMARY | business | foreigntable1 | PRIMARY KEY | | def | business | PRIMARY | business | twoprimarykeytabledemo | PRIMARY KEY | | def | business | PRIMARY | business | showconstraintsdemo | PRIMARY KEY | | def | business | BookAuthor | business | showconstraintsdemo | UNIQUE | | def | business | PRIMARY | business | autoincrementtozero | PRIMARY KEY | | def | business | PRIMARY | business | altertabletoaddautoincrement | PRIMARY KEY | | def | business | PRIMARY | business | addingprimarykeydemo | PRIMARY KEY | | def | business | PRIMARY | business | resetprimarykey | PRIMARY KEY | | def | business | constFKPK | business | foreigntable | FOREIGN KEY | | def | business | FKConst | business | foreigntabledemo | FOREIGN KEY | | def | business | ConstFK | business | tblf | FOREIGN KEY | | def | business | StudCollegeConst | business | studentenrollment | FOREIGN KEY | | def | business | ConstChild | business | childdemo | FOREIGN KEY | | def | business | primarytable1demo_ibfk_1 | business | primarytable1demo | FOREIGN KEY | +--------------------+-------------------+--------------------------+--------------+------------------------------+-----------------+ 48 rows in set, 2 warnings (0.24 sec)
