MySQL基礎《一》資料庫的命令操作
1、建立資料庫
1.1 CREATE {DATABASE|SCHEMA} db_name;
mysql> CREATE DATABASE bingwu;或CREATE SCHEMA bingwu;
Query OK, 1 row affected (0.00 sec)
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| bingwu |
1.2檢查資料庫是否存在，不存在則建立CREATE DATABASE[IF NOT EXISTS] db_name;
mysql> CREATE DATABASE IF NOT EXISTS bingwu;
Query OK, 1 row affected, 1 warning (0.00 sec)
1.3 建立資料的同時指定編碼方式；
CREATE DATABASE [IF NO EXISTS] db_name [DEFAULT] CHARCTER SET [=] charset;
注意：資料庫的名稱要有意義；名稱不能包含特殊字元或者是MySQL關鍵字
2、 檢視全部資料庫 SHOW DATABASES|SCHEMAS;
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| bingwu |
3、檢視指定的資料庫詳細資訊 SHOW CREATE DATABASE db_name;
mysql> SHOW CREATE DATABASE bingwu;
+----------+-----------------------------------------------------------------+
| Database | Create Database |
+----------+-----------------------------------------------------------------+
| bingwu | CREATE DATABASE `bingwu` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+----------+-----------------------------------------------------------------+
1 row in set (0.00 sec)
4、修改指定資料庫編碼方式 alter database db_name [default] character set [=] charset;
mysql> ALTER DATABASE bingwu DEFAULT CHARACTER SET=utf8;
Query OK, 1 row affected (0.00 sec)
mysql>
5、開啟指定資料庫 use db_name;
mysql> USE bingwu;
Database changed
6、得到當前開啟的資料庫 select databse()|schema();
mysql> SELECT DATABASE();
+------------+
| DATABASE() |
+------------+
| bingwu |
+------------+
1 row in set (0.00 sec)
mysql>
7、刪除指定的資料庫drop database db_name; 如果資料庫存在刪除：drop database [if exists] db_name;
mysql> DROP DATABASE bingwu1;
Query OK, 0 rows affected (0.01 sec)
mysql> DROP DATABASE IF EXISTS bingwu1;# 不存在會有警告
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql>
8、檢視警告warning
mysql> show warnings;
+-------+------+-------------------------------------------------------+
| Level | Code | Message |
+-------+------+-------------------------------------------------------+
| Note | 1008 | Can't drop database 'bingwu1'; database doesn't exist |
+-------+------+-------------------------------------------------------+
1 row in set (0.00 sec)
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