View MySQL character set and modify table structure

The source of MySQL garbled is a problem with incorrect MySQL character set settings, this article summarizes the commands for viewing the MySQL character set. This includes viewing the MySQL database server character set, viewing the MySQL database character set, and the character set of the data tables and fields, the character sets supported by the currently installed MySQL, and so on.

First, view the MySQL database server and database character set.

mysql> Show variables like '%char% ';
+--------------------------+-------------------------------------+------
| variable_name | Value |
+--------------------------+-------------------------------------+------
| character_set_client | utf8 | ...--client character Set
| character_set_connection | utf8 |.
| character_set_database | utf8 |--database Character Set
| character_set_filesystem | binary | ...
| character_set_results | utf8 |
| character_set_server | utf8 |--server character Set
| character_set_system | utf8 | ...
| character_sets_dir | D:\MySQL Server 5.0\share\charsets\ |
+--------------------------+-------------------------------------+------

Second, view the character set of the MySQL data Table (table).

mysql> Show table status from sqlstudy_db like '%countries% ';
+-----------+--------+---------+------------+------+-----------------+------
| Name | Engine | Version | Row_format | Rows | Collation |
+-----------+--------+---------+------------+------+-----------------+------
| countries | InnoDB | 10 | Compact | 11 | Utf8_general_ci |
+-----------+--------+---------+------------+------+-----------------+------

Third, view the character set of the MySQL data column (column).

Mysql> show full columns from countries;
+----------------------+-------------+-----------------+--------
| Field | Type | Collation | .......
+----------------------+-------------+-----------------+--------
| countries_id | Int (11) | NULL | .......
| Countries_name | VARCHAR (64) | Utf8_general_ci | .......
| countries_iso_code_2 | char (2) | Utf8_general_ci | .......
| Countries_iso_code_3 | CHAR (3) | Utf8_general_ci | .......
| address_format_id | Int (11) | NULL | .......
+----------------------+-------------+-----------------+--------

Iv. View the character sets supported by the currently installed MySQL.

Mysql> Show CharSet;
Mysql> show Char set;
+----------+-----------------------------+---------------------+--------+
| Charset | Description | Default Collation | MaxLen |
+----------+-----------------------------+---------------------+--------+
| Big5 | Big5 Traditional Chinese | Big5_chinese_ci | 2 |
| Dec8 | DEC West European | Dec8_swedish_ci | 1 |
| cp850 | DOS West European | Cp850_general_ci | 1 |
| HP8 | HP West European | Hp8_english_ci | 1 |
| koi8r | Koi8-r relcom Russian | Koi8r_general_ci | 1 |
| Latin1 | cp1252 West European | Latin1_swedish_ci | 1 |
| latin2 | ISO 8859-2 Central European | Latin2_general_ci | 1 |
| Swe7 | 7bit Swedish | Swe7_swedish_ci | 1 |
| ASCII | US ASCII | Ascii_general_ci | 1 |
| Ujis | EUC-JP Japanese | Ujis_japanese_ci | 3 |
| Sjis | Shift-jis Japanese | Sjis_japanese_ci | 2 |
| Hebrew | ISO 8859-8 Hebrew | Hebrew_general_ci | 1 |
| tis620 | TIS620 Thai | Tis620_thai_ci | 1 |
| Euckr | EUC-KR Korean | Euckr_korean_ci | 2 |
| koi8u | Koi8-u Ukrainian | Koi8u_general_ci | 1 |
| gb2312 | GB2312 Simplified Chinese | Gb2312_chinese_ci | 2 |
| Greek | ISO 8859-7 Greek | Greek_general_ci | 1 |
| cp1250 | Windows Central European | Cp1250_general_ci | 1 |
| GBK | GBK Simplified Chinese | Gbk_chinese_ci | 2 |
| Latin5 | ISO 8859-9 Turkish | Latin5_turkish_ci | 1 |
| Armscii8 | ARMSCII-8 Armenian | Armscii8_general_ci | 1 |
| UTF8 | UTF-8 Unicode | Utf8_general_ci | 3 |
| UCS2 | UCS-2 Unicode | Ucs2_general_ci | 2 |
| cp866 | DOS Russian | Cp866_general_ci | 1 |
| KEYBCS2 | DOS Kamenicky Czech-slovak | Keybcs2_general_ci | 1 |
| Macce | Mac Central European | Macce_general_ci | 1 |
| Macroman | Mac West European | Macroman_general_ci | 1 |
| cp852 | DOS Central European | Cp852_general_ci | 1 |
| latin7 | ISO 8859-13 Baltic | Latin7_general_ci | 1 |
| cp1251 | Windows Cyrillic | Cp1251_general_ci | 1 |
| cp1256 | Windows Arabic | Cp1256_general_ci | 1 |
| cp1257 | Windows Baltic | Cp1257_general_ci | 1 |
| binary | Binary Pseudo CharSet | binary | 1 |
| Geostd8 | GEOSTD8 Georgian | Geostd8_general_ci | 1 |
| cp932 | SJIS for Windows Japanese | Cp932_japanese_ci | 2 |
| Eucjpms | Ujis for Windows Japanese | Eucjpms_japanese_ci | 3 |
+----------+-----------------------------+---------------------+--------+

View the MySQL character set command above for Windows & Linux.

Four. Modifying the character set of tables and fields
Modify Database
mysql> ALTER DATABASE name character set UTF8;
Modify Table
ALTER TABLE name convert to character set GBK;
modifying fields
ALTER TABLE name modify column ' field name ' varchar (character set GBK not null;
Add a table field
ALTER TABLE name add column ' field name ' varchar (character) set GBK;
Note: Field names are not quoted during command execution

View MySQL character set and modify table structure