Mysql 字符集引數翻譯

          The character set used for literals that do not have a character set introducer and for number-to-string conversion.        
         這個引數用來做沒有指定字符集字元的預設值，用來做數字到字元轉換（直譯不順，沒有理解意思，後記簡單說明）

          The character set used by the default database. The server          sets this variable whenever the default database changes. If          there is no default database, the variable has the same value          as .      
  預設資料庫使用的字符集。Sever在切換資料庫的時候設定這個引數，如果沒有預設資料庫，這個引數值和character_set_server一樣

          The file system character set. This variable is used to          interpret string literals that refer to file names, such as in          the and           statements and the           function. Such file          names are converted from           to                     before the file opening attempt occurs. The default value is           binary, which means that no conversion          occurs. For systems on which multi-byte file names are          permitted, a different value may be more appropriate. For          example, if the system represents file names using UTF-8, set           to           'utf8'.        
系統字符集，mysql訪問檔案的時候根據這個字符集找檔案：比如load data infile 和 select … into outfile 語句及loca_file函式；在沒有mysql開啟檔案前，將檔名從character_set_client to
character_set_filesystem轉換。該引數預設值是binary，表示不需要進行轉換。對使用多位元組表示檔名的系統，設定其它字符集更合適。如系統使用utf-8字符集，這個引數也設定為utf8 。

          The character set used for returning query results such as          result sets or error messages to the client.       
 這個引數用來指定伺服器給客戶端返回資料時使用的字符集。

          The server's default character set.        Server預設字符集，如果建表的時候不指定字符集，就使用這個值。

          The character set used by the server for storing identifiers. The value is always utf8.  
 Server儲存識別符號使用的字符集，值是utf-8     

          The directory where character sets are installed.