c# 連接Mysql數據庫

mysql.data.dll下載_c#連接mysql必要插件

全部版本下載：http://hovertree.com/h/bjaf/0sft36s9.htm

mysql.data.dll是C#操作MYSQL的驅動文件，是c#連接mysql必要插件，使c#語言更簡潔的操作mysql數據庫。當你的電腦彈出提示“丟失mysql.data.dll”或“無法找到mysql.data.dll”等錯誤問題，請下載本站為你提供的dll文件，使用它可以幫助用戶解決上述問題。
dll文件修復方法：
1、解壓下載的文件。
2、復制文件“mysql.data.dll”到系統目錄下。
3、系統目錄一般為：C:\WINNT\System32 64位系統為C:\Windows\SysWOW64
4、最后點擊開始菜單-->運行-->輸入regsvr32 mysql.data.dll 后，回車即可解決錯誤提示！ 

 

第三方組件：Mysql.Data.dll
說明：下載Mysql.Data.dll，然后在項目中添加該組件的引用，在代碼頁里輸入using Mysql.Data.MysqlClient，我們就可以順利的使用該類庫的函數建立連接了。

以下是幾個常用函數：

#region  建立MySql數據庫連接
    /// <summary>
    /// 建立數據庫連接.
    /// </summary>
    /// <returns>返回MySqlConnection對象</returns>
    public MySqlConnection getmysqlcon()
    {
    //http://sosoft.cnblogs.com/
        string M_str_sqlcon = "server=localhost;user id=root;password=root;database=abc"; //根據自己的設置
        MySqlConnection myCon = new MySqlConnection(M_str_sqlcon);
        return myCon;
    }
    #endregion

    #region  執行MySqlCommand命令
    /// <summary>
    /// 執行MySqlCommand
    /// </summary>
    /// <param name="M_str_sqlstr">SQL語句</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  創建MySqlDataReader對象
    /// <summary>
    /// 創建一個MySqlDataReader對象
    /// </summary>
    /// <param name="M_str_sqlstr">SQL語句</param>
    /// <returns>返回MySqlDataReader對象</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("連接數據庫成功!");

 }

 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.cnblogs.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 ); // 此處必須有，否則無法更新



 da.Fill( data );



 dataGrid.DataSource = data;

 }



 private void updateBtn_Click(object sender, System.EventArgs e)

 {

 DataTable changes = data.GetChanges();

 da.Update( changes );

 data.AcceptChanges();

 }

 http://www.cnblogs.com/sosoft/p/kaifajishu.html