MySql 編碼設(shè)置實(shí)際應(yīng)用代碼示例
以下的文章主要講述的是MySql 編碼設(shè)置的實(shí)際操作步驟，我們大家都知道MySQL 4.1的實(shí)際應(yīng)用字符集所支持(Character Set Support)主要有2個(gè)方面：即，字符集(Character set)與其實(shí)際的排序方式(Collation)。
對(duì)于實(shí)際應(yīng)用的相關(guān)字符集的支持細(xì)化到四個(gè)層次:
服務(wù)器(server)，數(shù)據(jù)庫(kù)(database)，數(shù)據(jù)表(table)和連接(connection)。
查看系統(tǒng)的字符集和排序方式的設(shè)定可以通過下面的兩條命令或mysql> status 。
- mysql> SHOW VARIABLES LIKE 'character_set_%';
- +--------------------------+----------------------------+
- | Variable_name | Value |
- +--------------------------+----------------------------+
- | character_set_client | latin1 |
- | character_set_connection | latin1 |
- | character_set_database | latin1 |
- | character_set_results | latin1 |
- | character_set_server | latin1 |
- | character_set_system | utf8 |
- | character_sets_dir | /usr/share/mysql/charsets/ |
- +--------------------------+----------------------------+
- 7 rows in set (0.00 sec)
- mysql> SHOW VARIABLES LIKE 'collation_%';
- +----------------------+-------------------+
- | Variable_name | Value |
- +----------------------+-------------------+
- | collation_connection | latin1_swedish_ci |
- | collation_database | latin1_swedish_ci |
- | collation_server | latin1_swedish_ci |
- +----------------------+-------------------+
- 3 rows in set (0.00 sec)
上面列出的值就是系統(tǒng)的默認(rèn)值。(很奇怪系統(tǒng)怎么默認(rèn)是latin1的瑞典語(yǔ)排序方式)...
當(dāng)我們按照原來(lái)的方式通過PHP存取MySQL數(shù)據(jù)庫(kù)時(shí)，就算設(shè)置了表的默認(rèn)字符集為utf8并且通過UTF-8編碼發(fā)送查詢，你會(huì)發(fā)現(xiàn)存入數(shù)據(jù)庫(kù)的仍然是亂碼。問題就出在這個(gè)connection連接層上。MySql 編碼設(shè)置解決方法是在發(fā)送查詢前執(zhí)行一下下面這句：
1.SET NAMES 'utf8';
它相當(dāng)于下面的三句指令：
- SET character_set_client = utf8;
- SET character_set_results = utf8;
- SET character_set_connection = utf8;
2. 創(chuàng)建數(shù)據(jù)庫(kù)
- mysql> create database name character set utf8;
3. 創(chuàng)建表
- CREATE TABLE `type` (
- `id` int(10) unsigned NOT NULL auto_increment,
- `flag_deleted` enum('Y','N') character set utf8 NOT NULL default 'N',
- `flag_type` int(5) NOT NULL default '0',
- `type_name` varchar(50) character set utf8 NOT NULL default '',
- PRIMARY KEY (`id`)
- ) DEFAULT CHARSET=utf8;
4. 修改數(shù)據(jù)庫(kù)成utf8的.
- mysql> alter database name character set utf8;
5. 修改表默認(rèn)用utf8.
- mysql> alter table type character set utf8;
6. 修改字段用utf8
- mysql> alter table type modify type_name varchar(50) CHARACTER SET utf8;
以上的相關(guān)內(nèi)容就是對(duì)MySql 編碼設(shè)置的介紹，望你能有所收獲。
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