如何了解 MySQL 视图的构成?
以下为语法 −
show create view yourViewName;
让我们首先创建一个表 −
mysql> create table DemoTable -> ( -> StudentName varchar(20) -> ); Query OK, 0 rows affected (0.56 sec)
使用插入命令在表中插入一些记录 −
mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.13 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
这将生成以下输出 −
+-------------+ | StudentName | +-------------+ | Chris | | Robert | | David | +-------------+ 3 rows in set (0.00 sec)
以下是为表创建视图的查询 −
mysql> CREATE VIEW view_DemoTable AS SELECT StudentName from DemoTable; Query OK, 0 rows affected (0.12 sec)
以下是查看 MySQL 视图的构成的查询 −
mysql> show create view view_DemoTable;
输出
这将生成以下输出 −
+-------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+ | View | Create View | character_set_client | collation_connection | +-------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+ | view_DemoTable | CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`%` SQL SECURITY DEFINER VIEW `view_DemoTable` AS select `DemoTable`.`StudentName` AS `StudentName` from `DemoTable` | utf8 | utf8_general_ci | +-------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+ 1 row in set (0.00 sec)
让我们检查视图记录 −
mysql> select *from view_DemoTable;
输出
这将生成以下输出 −
+-------------+ | StudentName | +-------------+ | Chris | | Robert | | David | +-------------+ 3 rows in set (0.05 sec)
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