c# 连接Mysql数据库

mysql.data.dll下载_c#连接mysql必要插件

mysql.data.dll是C#操作MYSQL的驱动文件，是c#连接mysql必要插件，使c#语言更简洁的操作mysql数据库。当你的电脑弹出提示“丢失mysql.data.dll”或“无法找到mysql.data.dll”等错误问题，请下载本站为你提供的dll文件，使用它可以帮助用户解决上述问题。dll文件修复方法：1、解压下载的文件。2、复制文件“mysql.data.dll”到系统目录下。3、系统目录一般为：C:/WINNT/System32 64位系统为C:/Windows/SysWOW644、最后点击开始菜单-->运行-->输入regsvr32 mysql.data.dll 后，回车即可解决错误提示！

第三方组件：Mysql.Data.dll说明：下载Mysql.Data.dll，然后在项目中添加该组件的引用，在代码页里输入using Mysql.Data.MysqlClient，我们就可以顺利的使用该类库的函数建立连接了。以下是几个常用函数：

#region  建立MySql数据库连接    /// <summary>    /// 建立数据库连接.    /// </summary>    /// <returns>返回MySqlConnection对象</returns>    public MySqlConnection getmysqlcon()    {    //http://sosoft.VEVb.com/        string M_str_sqlcon = "server=localhost;user id=root;passWord=root;database=abc"; //根据自己的设置        MySqlConnection myCon = new MySqlConnection(M_str_sqlcon);        return myCon;    }    #endregion    #region  执行MySqlCommand命令    /// <summary>    /// 执行MySqlCommand    /// </summary>    /// <param name="M_str_sqlstr">SQL语句</param>    public void getmysqlcom(string M_str_sqlstr)    {        MySqlConnection mysqlcon = this.getmysqlcon();        mysqlcon.Open();        MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);        mysqlcom.ExecuteNonQuery();        mysqlcom.Dispose();        mysqlcon.Close();        mysqlcon.Dispose();    }    #endregion#region  创建MySqlDataReader对象    /// <summary>    /// 创建一个MySqlDataReader对象    /// </summary>    /// <param name="M_str_sqlstr">SQL语句</param>    /// <returns>返回MySqlDataReader对象</returns>    public MySqlDataReader getmysqlread(string M_str_sqlstr)    {        MySqlConnection mysqlcon = this.getmysqlcon();        MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);        mysqlcon.Open();        MySqlDataReader mysqlread = mysqlcom.ExecuteReader(CommandBehavior.CloseConnection);        return mysqlread;    }    #endregion

using System.Data;using MySql.Data.MySqlClient;PRivate MySqlConnection conn;private DataTable data;private MySqlDataAdapter da;private MySqlCommandBuilder  cb;private DataGrid  dataGrid;private void connectBtn_Click(object sender, System.EventArgs e) { if (conn != null) conn.Close();  string connStr = String.Format("server={0};user id={1}; password={2}; port={3}; database=mysql; pooling=false; charset=utf8", server.Text, userid.Text, password.Text, 3306); try  { conn = new MySqlConnection( connStr ); conn.Open(); GetDatabases();                MessageBox.Show("连接数据库成功!"); } catch (MySqlException ex)  { MessageBox.Show( "Error connecting to the server: " + ex.Message ); } } private void GetDatabases()  { MySqlDataReader reader = null; MySqlCommand cmd = new MySqlCommand("SHOW DATABASES", conn); try  { reader = cmd.ExecuteReader(); databaseList.Items.Clear(); while (reader.Read())  { databaseList.Items.Add( reader.GetString(0) ); } } catch (MySqlException ex)  { MessageBox.Show("Failed to populate database list: " + ex.Message ); } finally  { if (reader != null) reader.Close(); } } private void databaseList_SelectedIndexChanged(object sender, System.EventArgs e) { MySqlDataReader reader = null; conn.ChangeDatabase(databaseList.SelectedItem.ToString());//http://sosoft.VEVb.com/ MySqlCommand cmd = new MySqlCommand("SHOW TABLES", conn); try  { reader = cmd.ExecuteReader(); tables.Items.Clear(); while (reader.Read())  { tables.Items.Add( reader.GetString(0) ); } } catch (MySqlException ex)  { MessageBox.Show("Failed to populate table list: " + ex.Message ); } finally  { if (reader != null) reader.Close(); } } private void tables_SelectedIndexChanged(object sender, System.EventArgs e) { data = new DataTable();  da = new MySqlDataAdapter("SELECT * FROM " + tables.SelectedItem.ToString(), conn );     cb = new MySqlCommandBuilder( da ); // 此处必须有，否则无法更新 da.Fill( data ); dataGrid.DataSource = data; } private void updateBtn_Click(object sender, System.EventArgs e) { DataTable changes = data.GetChanges(); da.Update( changes ); data.AcceptChanges(); }