Correct understanding of MySQL Character Set

The following articles mainly describe the correct understanding of the MySQL character set. We all know that the MySQL database can specify the actual application character set to a database, a table, and a column, the character set to use. MySQL character set is an understanding process. (1) A default character set is specified during MySQL compilation. This character set is latin.

The following articles mainly describe the correct understanding of the MySQL character set. We all know that the MySQL database can specify the actual application character set to a database, a table, and a column, the character set to use. MySQL character set is an understanding process. (1) A default character set is specified during MySQL compilation. This character set is latin.

The following articles mainly describe the correct understanding of the MySQL character set. We all know that the MySQL database can specify the actual application character set to a database, a table, and a column, the character set to use. MySQL character set is an understanding process.

(1) When compiling MySQL, a default character set is specified, which is latin1;

(2) When installing MySQL, you can specify a default character set in the configuration file (my. ini). If this character set is not specified, this value inherits from the one specified during compilation;

(3) When MySQLd is started, you can specify a default character set in the command line parameters. If not, this value inherits from the configuration in the configuration file, character_set_server is set to the default character set;

(4) When creating a new database, unless explicitly specified, the character set of this database is set to character_set_server by default;

(5) When a database is selected, character_set_database is set to the default Character Set of the database;

(6) When creating a table in the database, the default Character Set of the table is set to character_set_database, which is the default Character Set of the database;

(7) When setting a column in a table, unless explicitly specified, the default character set in this column is the default Character Set of the table;

3. MySQL Character Set Support has two aspects:

Character set and Collation)

4. Support for character sets is refined to four levels:

Server, database, table, and connection)

5. You can run the following two commands to view the character set and sorting method of the system:

 
 

  
  
MySQL> SHOW VARIABLES LIKE 'character_set_%'; 
  
  
 
  
  
+--------------------------+----------------------------+ 
  
  
| 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,D:\MySQL Server 5.0\share\charsets\ 
  
  
MySQL> SHOW VARIABLES LIKE 'collation_%'; 
  
  
+--------------------------+----------------------------+ 
  
  
| Variable_name | Value | 
  
  
+--------------------------+----------------------------+ 
  
  
collation_connection,utf8_general_ci 
  
  
collation_database,utf8_general_ci 
  
  
collation_server,utf8_general_ci 
 
 

Status command:

 
 

  
  
MySQL>status; 
  
  
Server characterset: utf8 
  
  
Db characterset: utf8 
  
  
Client characterset: utf8 
  
  
Conn. characterset: utf8 
 
 

The above content is an introduction to the MySQL character set. I hope you will get something better.