公司的一個商城項目，外包給項目公司，要求用dotnet做，可是項目公司因為工期的問題，又有php的成熟代碼，所以同意改用php開發。可是因為不懂php程序，后續的開發智能用dotnet，只好用dotnet連接mysql做后續開發了。
還好，mysql對dotnet的支持非常好，網上資料也很多，發現一篇比較好的推薦給大家：
1、 Asp.net連接mysql 不推薦使用ODBC,推薦是用mysql官網提供的組件動)MySQL.Data.Dll，官網地址，
http://dev.mysql.com/downloads/connector/net/5.1.html；可能需要簡單的注冊下用戶，看好版本，如果嫌棄麻煩可以直接下載一個相應版本的MySQL.Data.Dll ，放入bin下，增加引用即可
2、我自己寫的一個簡單MysqlHelper.cs類，操作和sqlserver 很相似。有了這個類，你就知道怎么用了，很簡單代碼如下 ：
View Code
MysqlHelper類 using System; using System.Collections; using System.Collections.Specialized; using System.Data; using MySql.Data.MySqlClient; using System.Configuration; using System.Data.Common; using System.Collections.Generic; using System.Text.RegularExpressions; namespace LOAF.DAL { public class MysqlHelper { //數據庫連接字符串(web.config來配置)，可以動態更改connectionString支持多數據庫. // public static string connectionString = ConfigurationManager.ConnectionStrings["ConnDB"].ConnectionString; public static string connectionString = ConfigurationManager.AppSettings["MySQL"]; //public string m = ConfigurationManager.AppSettings["MySQL"]; public MysqlHelper() { } #region ExecuteNonQuery //執行SQL語句，返回影響的記錄數 /// <summary> /// 執行SQL語句，返回影響的記錄數 /// </summary> /// <param name="SQLString">SQL語句</param> /// <returns>影響的記錄數</returns> public static int ExecuteNonQuery(string SQLString) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { using (MySqlCommand cmd = new MySqlCommand(SQLString, connection)) { try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (MySql.Data.MySqlClient.MySqlException e) { connection.Close(); throw e; } } } } /// <summary> /// 執行SQL語句，返回影響的記錄數 /// </summary> /// <param name="SQLString">SQL語句</param> /// <returns>影響的記錄數</returns> public static int ExecuteNonQuery(string SQLString, params MySqlParameter[] cmdParms) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { using (MySqlCommand cmd = new MySqlCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); int rows = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return rows; } catch (MySql.Data.MySqlClient.MySqlException e) { throw e; } } } } //執行多條SQL語句，實現數據庫事務。 /// <summary> /// 執行多條SQL語句，實現數據庫事務。 /// </summary> /// <param name="SQLStringList">多條SQL語句</param> public static bool ExecuteNoQueryTran(List<String> SQLStringList) { using (MySqlConnection conn = new MySqlConnection(connectionString)) { conn.Open(); MySqlCommand cmd = new MySqlCommand(); cmd.Connection = conn; MySqlTransaction tx = conn.BeginTransaction(); cmd.Transaction = tx; try { for (int n = 0; n < SQLStringList.Count; n++) { string strsql = SQLStringList[n]; if (strsql.Trim().Length > 1) { cmd.CommandText = strsql; PrepareCommand(cmd, conn, tx, strsql, null); cmd.ExecuteNonQuery(); } } cmd.ExecuteNonQuery(); tx.Commit(); return true; } catch { tx.Rollback(); return false; } } } #endregion #region ExecuteScalar /// <summary> /// 執行一條計算查詢結果語句，返回查詢結果（object）。 /// </summary> /// <param name="SQLString">計算查詢結果語句</param> /// <returns>查詢結果（object）</returns> public static object ExecuteScalar(string SQLString) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { using (MySqlCommand cmd = new MySqlCommand(SQLString, connection)) { try { connection.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (MySql.Data.MySqlClient.MySqlException e) { connection.Close(); throw e; } } } } /// <summary> /// 執行一條計算查詢結果語句，返回查詢結果（object）。 /// </summary> /// <param name="SQLString">計算查詢結果語句</param> /// <returns>查詢結果（object）</returns> public static object ExecuteScalar(string SQLString, params MySqlParameter[] cmdParms) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { using (MySqlCommand cmd = new MySqlCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); object obj = cmd.ExecuteScalar(); cmd.Parameters.Clear(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (MySql.Data.MySqlClient.MySqlException e) { throw e; } } } } #endregion #region ExecuteReader /// <summary> /// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close ) /// </summary> /// <param name="strSQL">查詢語句</param> /// <returns>MySqlDataReader</returns> public static MySqlDataReader ExecuteReader(string strSQL) { MySqlConnection connection = new MySqlConnection(connectionString); MySqlCommand cmd = new MySqlCommand(strSQL, connection); try { connection.Open(); MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); return myReader; } catch (MySql.Data.MySqlClient.MySqlException e) { throw e; } } /// <summary> /// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close ) /// </summary> /// <param name="strSQL">查詢語句</param> /// <returns>MySqlDataReader</returns> public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms) { MySqlConnection connection = new MySqlConnection(connectionString); MySqlCommand cmd = new MySqlCommand(); try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return myReader; } catch (MySql.Data.MySqlClient.MySqlException e) { throw e; } // finally // { // cmd.Dispose(); // connection.Close(); // } } #endregion #region ExecuteDataTable /// <summary> /// 執行查詢語句，返回DataTable /// </summary> /// <param name="SQLString">查詢語句</param> /// <returns>DataTable</returns> public static DataTable ExecuteDataTable(string SQLString) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (MySql.Data.MySqlClient.MySqlException ex) { throw new Exception(ex.Message); } return ds.Tables[0]; } } /// <summary> /// 執行查詢語句，返回DataSet /// </summary> /// <param name="SQLString">查詢語句</param> /// <returns>DataTable</returns> public static DataTable ExecuteDataTable(string SQLString, params MySqlParameter[] cmdParms) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { MySqlCommand cmd = new MySqlCommand(); PrepareCommand(cmd, connection, null, SQLString, cmdParms); using (MySqlDataAdapter da = new MySqlDataAdapter(cmd)) { DataSet ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (MySql.Data.MySqlClient.MySqlException ex) { throw new Exception(ex.Message); } return ds.Tables[0]; } } } //獲取起始頁碼和結束頁碼 public static DataTable ExecuteDataTable(string cmdText, int startResord, int maxRecord) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); MySqlDataAdapter command = new MySqlDataAdapter(cmdText, connection); command.Fill(ds, startResord, maxRecord, "ds"); } catch (MySql.Data.MySqlClient.MySqlException ex) { throw new Exception(ex.Message); } return ds.Tables[0]; } } #endregion /// <summary> /// 獲取分頁數據 在不用存儲過程情況下 /// </summary> /// <param name="recordCount">總記錄條數</param> /// <param name="selectList">選擇的列逗號隔開,支持top num</param> /// <param name="tableName">表名字</param> /// <param name="whereStr">條件字符 必須前加 and</param> /// <param name="orderExpression">排序 例如 ID</param> /// <param name="pageIdex">當前索引頁</param> /// <param name="pageSize">每頁記錄數</param> /// <returns></returns> public static DataTable getPager(out int recordCount, string selectList, string tableName, string whereStr, string orderExpression, int pageIdex, int pageSize) { int rows = 0; DataTable dt = new DataTable(); MatchCollection matchs = Regex.Matches(selectList, @"top\s+\d{1,}", RegexOptions.IgnoreCase);//含有top string sqlStr = sqlStr = string.Format("select {0} from {1} where 1=1 {2}", selectList, tableName, whereStr); if (!string.IsNullOrEmpty(orderExpression)) { sqlStr += string.Format(" Order by {0}", orderExpression); } if (matchs.Count > 0) //含有top的時候 { DataTable dtTemp = ExecuteDataTable(sqlStr); rows = dtTemp.Rows.Count; } else //不含有top的時候 { string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr); //獲取行數 object obj = ExecuteScalar(sqlCount); if (obj != null) { rows = Convert.ToInt32(obj); } } dt = ExecuteDataTable(sqlStr, (pageIdex-1)*pageSize, pageSize); recordCount = rows; return dt; } #region 創建command private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] cmdParms) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = CommandType.Text;//cmdType; if (cmdParms != null) { foreach (MySqlParameter parameter in cmdParms) { if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null)) { parameter.Value = DBNull.Value; } cmd.Parameters.Add(parameter); } } } #endregion } }
3、需要注意的地方有如下幾點
1）在sqlserver中參數化sql語句是用“@”符號，在mysql里面需要是用？號，切記，切記.
2 ）還有就是sqlserver中刪除表可以這樣寫delete news where ID=12，但是在mysql里面 是delete from news where ID=12，收了from報錯
3 ）我在使用過程中遇到了中文亂碼，網上大部分解決辦法是把表的設置成utf-8字符集。以及 C:\Program Files\MySQL\MySQL Server 5.1路徑下my.ini 打開找到兩處
default-character-set 都設置成=utf8。