MySql查看表的所有字段信息

參考http://hi.baidu.com/maojianlw/item/80e4a82d84b6950f43634a49

mysql和sqlserver中查看當前庫中所有表和字段信息

>>mysql :
1、查看所有表名：
show tables [from db_name];
2、查看字段信息
SHOW FULL COLUMNS FROM db_name.table_name

獲取以下信息
Field ：字段名
Type：字段類型
Collation：字符集（mysql 5.0以上有）
Null ：是否可以為NULL
Key：索引（PRI,unique,index)
Default：缺省值
Extra：額外（是否 auto_increment)
Privileges：權限
Comment：備注（mysql 5.0以上有)

mysql> create table teacher  # 創建teacher表
    -> (
    -> Id int (5) auto_increment not null primary key,
    -> name char(10) not null, 
    -> address varchar(50) default 'No.1 Mid school',
    -> year date
    -> );
Query OK, 0 rows affected (0.02 sec)

mysql> show tables;
+------------------+
| Tables_in_school |
+------------------+
| teacher          |
+------------------+
1 row in set (0.00 sec)

mysql> show full columns from teacher;  # 顯示teacher表的所有字段
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
| Field   | Type        | Collation         | Null | Key | Default         | Extra          | Privileges                      | Comment |
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
| Id      | int(5)      | NULL              | NO   | PRI | NULL            | auto_increment | select,insert,update,references |         |
| name    | char(10)    | latin1_swedish_ci | NO   |     | NULL            |                | select,insert,update,references |         |
| address | varchar(50) | latin1_swedish_ci | YES  |     | No.1 Mid school |                | select,insert,update,references |         |
| year    | date        | NULL              | YES  |     | NULL            |                | select,insert,update,references |         |
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
4 rows in set (0.01 sec)

mysql> drop table teacher;  # 刪除teacher表
Query OK, 0 rows affected (0.03 sec)

mysql> show tables;
Empty set (0.00 sec)

mysql>