c#连接mysql中文乱码解决方案（MySql.Data.dll）
今天用C#类连接mysql数据库出现中文乱码具体解决方案如下：
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用到的mysql表结构：
CREATE TABLE IF NOT EXISTS `tet` (
? `id` int(11) NOT NULL,
? `name` varchar(255) NOT NULL,
? `url` varchar(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
用到的mysql表数据：
INSERT INTO `tet` (`id`, `name`, `url`) VALUES
(1, '百度', 'http://www.baidu.com'),
(0, 'google', 'http://www.google.com.hk'),
(3, '400电话', 'http://www.my400800.cn');
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一、查询结果没有问题，在查询条件中如果输入中文查询不到内容，用insert测试为，插入的内容是乱码
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????? 首先在MySQL Command Line Client里面输入“SHOW VARIABLES LIKE 'character_set_%';”，可看到如下字符：
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Variable_nameValuecharacter_set_clientutf8character_set_connectionutf8character_set_databaseutf8character_set_filesystembinarycharacter_set_resultsutf8character_set_serverlatin1character_set_systemutf8character_sets_dirC:\Program Files\VertrigoServ\Mysql\share\charsets\?
可以用如下连接字符串解决中文乱码问题
User Id=test;Host=localhost;Database=eczhou;password=test;charset='gb2312'
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二、检索结果和插入内容都是乱码
用MySQL Command Line Client里面输入“SHOW VARIABLES LIKE 'character_set_%';”，可看到如下字符：
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Variable_nameValuecharacter_set_clientutf8character_set_connectionutf8character_set_databaseutf8character_set_filesystembinarycharacter_set_resultsutf8character_set_serverutf8character_set_systemutf8character_sets_dir/usr/share/mysql/charsets/?
即便是连接字符串改成
User Id=test;Host=localhost;Database=eczhou;password=test;charset=utf8 检索的结果还是乱码
郁闷中。。。。。。。
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然后用? show variables like 'collation%';显示结果是：
+----------------------+-----------------+
| Variable_name??????? | Value?????????? |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database?? | utf8_general_ci |
| collation_server???? | utf8_general_ci |
+----------------------+-----------------+
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show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name??????????? | Value????????????????????? |
+--------------------------+----------------------------+
| character_set_client???? | latin1???????????????????? |
| character_set_connection | latin1???????????????????? |
| character_set_database?? | utf8?????????????????????? |
| character_set_filesystem | binary???????????????????? |
| character_set_results??? | latin1???????????????????? |
| character_set_server???? | utf8?????????????????????? |
| character_set_system???? | utf8?????????????????????? |
| character_sets_dir?????? | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
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经过不懈努力的查找，终于找到问题了,问题就出在上面红色字体的编码上，我的解决方法如下：
连接字符串修改如下：
server=localhost;uid=root;pwd=root;database=test;Charset=latin1
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c#代码如下：
?/// <summary>
??????? /// 执行查询语句，返回DataSet
??????? /// </summary>
??????? /// <param name="SQLString">查询语句</param>
??????? /// <returns>DataSet</returns>
??????? public static DataSet Query(string SQLString)
??????? {
??????????? using (MySqlConnection connection = new MySqlConnection(connectionString))
??????????? {
??????????????? DataSet ds = new DataSet();
????????????
??????????????? try
??????????????? {
??????????????????? connection.Open();
??????????????????? MySqlCommand M = new MySqlCommand("set names 'latin1'", connection);
??????????????????? M.ExecuteNonQuery();
??????????????????? //
??????????????????? MySqlDataAdapter da = new MySqlDataAdapter(SQLString, connection);
??????????????????? da.Fill(ds);
??????????????? }
??????????????? catch (MySqlException ex)
??????????????? {
??????????????????? connection.Close();
??????????????????? throw new Exception(ex.Message);
??????????????? }
??????????????? finally
??????????????? {
??????????????????? connection.Close();
??????????????? }
??????????????? DataTable dt = ds.Tables[0];
??????????????? foreach (DataRow dr in dt.Rows)
??????????????? {
??????????????????? for (int i = 0; i < dt.Columns.Count; i++)
??????????????????? {
??????????????????????? dr[i] = Encoding.UTF8.GetString(Encoding.GetEncoding("latin1").GetBytes(dr[i].ToString()));
??????????????????? }
??????????????? }
??????????????? return ds;
??????????? }
??????? }
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一定要注意上面的红色字体。
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