JAVA高级面试进阶训练营视频教程

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首先在数据库里面输入

mysql> show variables like'%char%'
    -> ;
+--------------------------------------+----------------------------+
| Variable_name                        | Value                      |
+--------------------------------------+----------------------------+
| character_set_client                 | utf8                       |
| character_set_connection             | utf8                       |
| character_set_database               | latin1                     |
| character_set_filesystem             | binary                     |
| character_set_results                | utf8                       |
| character_set_server                 | latin1                     |
| character_set_system                 | utf8                       |
| character_sets_dir                   | /usr/share/mysql/charsets/ |
| validate_password_special_char_count | 1                          |
+--------------------------------------+----------------------------+
9 rows in set (0.00 sec)

mysql> set character_set_database=utf8;                   #更改编码属性
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> set character_set_server=utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> set character_set_client=gbk;
Query OK, 0 rows affected (0.00 sec)

mysql> set character_set_connection=gbk;
Query OK, 0 rows affected (0.00 sec)

mysql> set character_set_client=utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> set character_set_connection=utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like'%char%'
    -> ;
+--------------------------------------+----------------------------+
| Variable_name                        | Value                      |
+--------------------------------------+----------------------------+
| character_set_client                 | utf8                       |
| character_set_connection             | utf8                       |
| character_set_database               | utf8                       |
| character_set_filesystem             | binary                     |
| character_set_results                | utf8                       |
| character_set_server                 | utf8                       |
| character_set_system                 | utf8                       |
| character_sets_dir                   | /usr/share/mysql/charsets/ |
| validate_password_special_char_count | 1                          |
+--------------------------------------+----------------------------+
9 rows in set (0.00 sec)

mysql> use test1
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> showtables
    -> ;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'showtables' at line 1
mysql> show tables;
+-----------------+
| Tables_in_test1 |
+-----------------+
| address         |
| authors         |
| book_m2m_author |
| books           |
| customer        |
| student         |
| study_record    |
+-----------------+
7 rows in set (0.00 sec)

mysql> insert into books (name) value('我')；
    -> ;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '；' at line 1
mysql> insert into books (name) value('我');
ERROR 1366 (HY000): Incorrect string value: '\xE6\x88\x91' for column 'name' at row 1
mysql> alter table books convert to character set utf8;           #将数据表的编码方式改成utf8
Query OK, 3 rows affected (0.02 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> insert into books (name) value('我');
Query OK, 1 row affected (0.01 sec)

mysql> select * from books;
+----+------+----------+
| id | name | pub_date |
+----+------+----------+
|  1 | bbu1 | NULL     |
|  2 | bbu2 | NULL     |
|  3 | bbu3 | NULL     |
|  4 | 我   | NULL     |
+----+------+----------+
4 rows in set (0.00 sec)

mysql> select * from books;
+----+--------------+----------+
| id | name         | pub_date |
+----+--------------+----------+
|  1 | bbu1         | NULL     |
|  2 | bbu2         | NULL     |
|  3 | bbu3         | NULL     |
|  4 | 我           | NULL     |
|  5 | 我的世界     | NULL     |
+----+--------------+----------+
5 rows in set (0.00 sec)

mysql> 

 

设置MYSQL数据库编码为UTF-8

 

1、  编辑MySql的配置文件

MySql的配置文件Windows下一般在系统目录下或者在MySql的安装目录下名字叫my.ini，可以搜索，Linux下一般是/etc/my.cnf

 

--在 [mysqld] 标签下加上以下内容：

default-character-set = utf8

character_set_server = utf8

注意：如果此标签下已经存在“default-character-set=GBK”类似的内容，只需修改即可。

--在 [mysql]  标签下加上一行

default-character-set = utf8

 

--在 [mysql.server]标签下加上一行

default-character-set = utf8

 

--在 [mysqld_safe]标签下加上一行

default-character-set = utf8

 

--在 [client]标签下加上一行

default-character-set = utf8

 

2、  重新启动MySql服务

Windows可在服务管理器中操作，也可使用命令行：

net stop mysql 回车

net start mysql 回车

服务名可能不一定为mysql，请按自己的设置

 

Linux下面可是用 service mysql restart

 

如果出现启动失败，请检查配置文件有没有设置错误

 

3、  查看设置结果
登录MySql命令行客户端：打开命令行

mysql –uroot –p 回车

输入密码

进入mysql后 执行 ：show variables like "% character %";
显示结果应该类似如下：

 

| character_set_client | utf8 |

| character_set_connection | utf8 |

| character_set_database | utf8 |

| character_set_results | utf8 |

| character_set_server | utf8 |

| character_set_system | utf8 |

| character_sets_dir | /usr/share/mysql/charsets/ |

 

如果仍有编码不是utf8的，请检查配置文件，也可使用mysql命令设置：

set character_set_client = utf8;

set character_set_server = utf8;

set character_set_connection = utf8;

set character_set_database = utf8;

set character_set_results = utf8;

set collation_connection = utf8_general_ci;

set collation_database = utf8_general_ci;

set collation_server = utf8_general_ci;

 

 

 

另外：

 

建立数据库时可以使用以下命令：

create database app_relation character set utf8; 

use app_relation;

source app_relation.sql;

修改数据库编码的命令为：

alter database app_relation character set utf8;