MySQL在剛剛被安裝的時(shí)候,它的root用戶是沒(méi)有被設(shè)置密碼的。首先來(lái)設(shè)置MySQL的root密碼。[@more@]
[root@sample ~]# mysql -u root ← 用root用戶登錄MySQL服務(wù)器Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 2 to server version: 4.1.20 Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
mysql> select user,host,password from mysql.user; ← 查看用戶信息
+------+------------------------------+---------------+
| user | host | password |
+------+------------------------------+---------------+
| root | localhost | | ← root密碼為空
| root | sample.centospub.com | | ← root密碼為空
| | sample.centospub.com | |
| | localhost | |
+------+------------------------------+---------------+
4 rows in set (0.00 sec)
mysql> set password for root@localhost=password('在這里填入root密碼'); ← 設(shè)置root密碼
Query OK, 0 rows affected (0.01 sec)
mysql> set password for root@'sample.centospub.com'=password('在這里填入root密碼'); ← 設(shè)置root密碼
Query OK, 0 rows affected (0.01 sec)
mysql> select user,host,password from mysql.user; ← 查看用戶信息
+------+--------------------------------+--------------------------+
| user | host | password |
+------+--------------------------------+--------------------------+
| root | localhost | 19b68057189b027f | ← root密碼被設(shè)置
| root | sample.centospub.com | 19b68057189b027f | ← root密碼被設(shè)置
| | sample.centospub.com | |
| | localhost | |
+------+--------------------------------+--------------------------+
4 rows in set (0.01 sec)
mysql> exit ← 退出MySQL服務(wù)器Bye
+++++++然后,測(cè)試一下root密碼有沒(méi)有生效。
[root@sample ~]# mysql -u root ← 通過(guò)空密碼用root登錄
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) ← 出現(xiàn)此錯(cuò)誤信息說(shuō)明密碼設(shè)置成功
[root@localhost ~]# mysql -u root -h sample.centospub.com ← 通過(guò)空密碼用root登錄
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) ← 出現(xiàn)此錯(cuò)誤信息說(shuō)明密碼設(shè)置成功
[root@sample ~]# mysql -u root -p ← 通過(guò)密碼用root登錄
Enter password: ← 在這里輸入密碼
Welcome to the MySQL monitor. Commands end with ; or g. ← 確認(rèn)用密碼能夠成功登錄
Your MySQL connection id is 5 to server version: 4.1.20 Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
mysql> exit
Bye
[root@sample ~]# mysql -u root -h sample.centospub.com -p ← 通過(guò)密碼用root登錄
Enter password: ← 在這里輸入密碼
Welcome to the MySQL monitor. Commands end with ; or g. ← 確認(rèn)用密碼能夠成功登錄
Your MySQL connection id is 6 to server version: 4.1.20
Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
mysql> exit ← 退出MySQL服務(wù)器
Bye
++++++++++++++[2] 刪除匿名用戶
在MySQL剛剛被安裝后,存在用戶名、密碼為空的用戶。這使得數(shù)據(jù)庫(kù)服務(wù)器有無(wú)需密碼被登錄的可能性。為消除隱患,將匿名用戶刪除。
[root@sample ~]# mysql -u root -p ← 通過(guò)密碼用root登錄
Enter password: ← 在這里輸入密碼
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 7 to server version: 4.1.20 Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
mysql> select user,host from mysql.user; ← 查看用戶信息
+------+----------------------------+
| user | host |
+------+----------------------------+
| | localhost |
| root | localhost |
| | sample.centospub.com |
| root | sample.centospub.com |
+------+----------------------------+
4 rows in set (0.02 sec)
mysql> delete from mysql.user where user=''; ← 刪除匿名用戶
Query OK, 2 rows affected (0.17 sec)
mysql> select user,host from mysql.user; ← 查看用戶信息
+------+----------------------------+
| user | host |
+------+----------------------------+
| root | localhost |
| root | sample.centospub.com |
+------+----------------------------+
2 rows in set (0.00 sec)
mysql>
exit ← 退出MySQL服務(wù)器Bye
+++++++++++++++++++[3] 刪除測(cè)試用數(shù)據(jù)庫(kù)
在MySQL被安裝后,存在名為test的空數(shù)據(jù)庫(kù),將它刪除。這里要注意的是,系統(tǒng)默認(rèn)的還有一個(gè)名為mysql的數(shù)據(jù)庫(kù),它用于系統(tǒng)管理,所以請(qǐng)不要?jiǎng)h除。
[root@sample ~]#
mysql -u root -p ← 通過(guò)密碼用root登錄Enter password:
← 在這里輸入密碼Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 8 to server version: 4.1.20
Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
mysql> show databases; ← 查看系統(tǒng)已存在的數(shù)據(jù)庫(kù)
+-------------+
| Database |
+-------------+
| mysql |
| test |
+------------+
2 rows in set (0.02 sec)
mysql> drop database test; ← 刪除名為test的空數(shù)據(jù)庫(kù)
Query OK, 0 rows affected (0.07 sec)
mysql> show databases; ← 查看系統(tǒng)已存在的數(shù)據(jù)庫(kù)
+-------------+
| Database |
+-------------+
| mysql | ← 確認(rèn)名為test的數(shù)據(jù)庫(kù)被刪除,已不存在
+-------------+
1 row in set (0.00 sec)
mysql>
exit ← 退出MySQL服務(wù)器Bye
++++++++++++
測(cè)試MySQL
下面對(duì)MySQL進(jìn)行測(cè)試。包括建立新用戶,以及用對(duì)關(guān)系性數(shù)據(jù)庫(kù)進(jìn)行數(shù)據(jù)庫(kù)操作的指令來(lái)試著建立數(shù)據(jù)庫(kù)及數(shù)據(jù)表。這里,新建用戶以centospub為例。
[root@sample ~]# mysql -u root -p ← 通過(guò)密碼用root登錄
Enter password: ← 在這里輸入密碼
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 9 to server version: 4.1.20 Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
mysql> grant all privileges on test.* to centospub@localhost identified by '在這里定義密碼'; ← 建立對(duì)test數(shù)據(jù)庫(kù)有完全操作權(quán)限的名為centospub的用戶
Query OK, 0 rows affected (0.03 sec)
mysql> select user from mysql.user where user='centospub'; ← 確認(rèn)centospub用戶的存在與否
+---------+
| user |
+---------+
| centospub | ← 確認(rèn)centospub已經(jīng)被建立
+---------+
1 row in set (0.01 sec)
mysql> exit ← 退出MySQL服務(wù)器
Bye
[root@sample ~]# mysql -u centospub -p ← 用新建立的centospub用戶登錄MySQL服務(wù)器
Enter password: ← 在這里輸入密碼
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 10 to server version: 4.1.20
Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
mysql> create database test; ← 建立名為test的數(shù)據(jù)庫(kù)
Query OK, 1 row affected (0.00 sec)
mysql> show databases; ← 查看系統(tǒng)已存在的數(shù)據(jù)庫(kù)
+-------------+
| Database |
+-------------+
| test |
+-------------+
1 row in set (0.00 sec)
mysql> use test ← 連接到數(shù)據(jù)庫(kù)
Database changed
mysql> create table test(num int, name varchar(50)); ← 在數(shù)據(jù)庫(kù)中建立表
Query OK, 0 rows affected (0.03 sec)
mysql> show tables; ← 查看數(shù)據(jù)庫(kù)中已存在的表
+-------------------+
| Tables_in_test |
+-------------------+
| test |
+-------------------+
1 row in set (0.01 sec)
mysql> insert into test values(1,'Hello World!'); ← 插入一個(gè)值到表中
Query OK, 1 row affected (0.02 sec)
mysql> select * from test; ← 查看數(shù)據(jù)庫(kù)中的表的信息
+------+-------------------+
| num | name |
+------+-------------------+
| 1 | Hello World! |
+------+-------------------+
1 row in set (0.00 sec)
mysql> update test set name='Hello Everyone!'; ← 更新表的信息,賦予新的值
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from test; ← 查看數(shù)據(jù)庫(kù)中的表的信息
+------+----------------------+
| num | name |
+------+----------------------+
| 1 | Hello Everyone! | ← 確認(rèn)被更新到新的值
+------+----------------------+
1 row in set (0.01 sec)
mysql> delete from test where num=1; ← 刪除表內(nèi)的值
Query OK, 1 row affected (0.00 sec)
mysql> select * from test; ← 確認(rèn)刪除結(jié)果
Empty set (0.01 sec)
mysql> drop table test; ← 刪除表
Query OK, 0 rows affected (0.01 sec)
mysql> show tables; ← 查看表信息
Empty set (0.00 sec) ← 確認(rèn)表已被刪除
mysql> drop database test; ← 刪除名為test的數(shù)據(jù)庫(kù)
Query OK, 0 rows affected (0.01 sec)
mysql> show databases; ← 查看已存在的數(shù)據(jù)庫(kù)
Empty set (0.01 sec) ← 確認(rèn)test數(shù)據(jù)庫(kù)已被刪除(這里非root用戶的關(guān)系,看不到名為mysql的數(shù)據(jù)庫(kù))
mysql> exit ← 退出MySQL服務(wù)器Bye