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c#连接mysql中文乱码解决方案(MySql.Data.dll)

 2012/1/13 9:07:00  ljl_xyf  程序员俱乐部  我要评论(0)
  • 摘要: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:用到的mysql表结构:CREATETABLEIFNOTEXISTS`tet`(`id`int(11)NOTNULL,`name`varchar(255)NOTNULL,`url`varchar(255)NOTNULL)ENGINE=InnoDBDEFAULTCHARSET=utf8;用到的mysql表数据:INSERTINTO`tet`(`id`,`name`,`url`)VALUES(1,'百度','http://www
  • 标签:解决方案 C# 解决 文乱码 连接 SQL MySQL C#连接Mysql

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_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 latin1 character_set_system utf8 character_sets_dir C:\Program Files\VertrigoServ\Mysql\share\charsets\

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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_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 /usr/share/mysql/charsets/

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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 |
+----------------------+-----------------+

?

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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