ASP.NET 访问 MySql-白红宇

ASP.NET 访问 MySql

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发布时间：2019-06-28

本文共 9201 字，大约阅读时间需要 30 分钟。

1. 首先需要安装mysql，脚本之家下载地址： http://www.jb51.net/softs/2193.html 或者去mysql.com官网都可以,一路next，安装好后，有个简单配置,提示有个设置登录密码和服务名称，

默认localhost，用户名root，密码自己设置。
2. 安装了mysql数据库后，需要一个管理工具，就像sqlserver的SQL Server Management Studio一样，推荐使用Navicat for MySQL，
下载地址：http://www.jb51.net/database/2223.html，安装后，打开界面如下图
确定后，右键新建的连接名字，就可以建数据库，建表了。字段类型和sqlserver基本一致。

3. Asp.net连接mysql 不推荐使用ODBC,推荐是用mysql官网提供的组件动)MySQL.Data.Dll，官网地址，

http://dev.mysql.com/downloads/connector/net/5.1.html；可能需要简单的注册下用户，看好版本，如果嫌弃麻烦可以直接下载一个相应版本的MySQL.Data.Dll ，放入bin下，增加引用即可 4. 我自己写的一个简单MysqlHelper.cs类，操作和sqlserver 很相似。有了这个类，你就知道怎么用了，很简单代码如下

. 代码如下:

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 { //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库. // 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 //执行SQL语句，返回影响的记录数 ///  /// 执行SQL语句，返回影响的记录数 /// 
 /// SQL语句 /// 
      
       影响的记录数
       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; } } } } ///  /// 执行SQL语句，返回影响的记录数 /// 
 /// SQL语句 /// 
      
       影响的记录数
       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; } } } } //执行多条SQL语句，实现数据库事务。 ///  /// 执行多条SQL语句，实现数据库事务。 /// 
 /// 多条SQL语句 public static bool ExecuteNoQueryTran(List
      
        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 /// 
        /// 执行一条计算查询结果语句，返回查询结果（object）。 /// 
 /// 
       计算查询结果语句 /// 
       
        查询结果（object）
        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; } } } } /// 
        /// 执行一条计算查询结果语句，返回查询结果（object）。 /// 
 /// 
       计算查询结果语句 /// 
       
        查询结果（object）
        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 /// 
        /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close ) /// 
 /// 
       查询语句 /// 
       
        MySqlDataReader
        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; } } /// 
        /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close ) /// 
 /// 
       查询语句 /// 
       
        MySqlDataReader
        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 /// 
        /// 执行查询语句，返回DataTable /// 
 /// 
       查询语句 /// 
       
        DataTable
        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]; } } /// 
        /// 执行查询语句，返回DataSet /// 
 /// 
       查询语句 /// 
       
        DataTable
        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]; } } } //获取起始页码和结束页码 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 /// 
        /// 获取分页数据 在不用存储过程情况下 /// 
 /// 
       总记录条数 /// 
       选择的列逗号隔开,支持top num /// 
       表名字 /// 
       条件字符 必须前加 and /// 
       排序 例如 ID /// 
       当前索引页 /// 
       每页记录数 /// 
        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的时候 { DataTable dtTemp = ExecuteDataTable(sqlStr); rows = dtTemp.Rows.Count; } else //不含有top的时候 { string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr); //获取行数 object obj = ExecuteScalar(sqlCount); if (obj != null) { rows = Convert.ToInt32(obj); } } dt = ExecuteDataTable(sqlStr, (pageIdex-1)*pageSize, pageSize); recordCount = rows; return dt; } #region 创建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 } }

5. 需要注意的地方有如下几点

1）在sqlserver中参数化sql语句是用“@”符号，在mysql里面需要是用？号，切记，切记. 2 ）还有就是sqlserver中删除表可以这样写delete news where ID=12，但是在mysql里面是delete from news where ID=12，收了from报错 3 ）我在使用过程中遇到了中文乱码，网上大部分解决办法是把表的设置成utf-8字符集。以及 C:\Program Files\MySQL\MySQL Server 5.1路径下my.ini 打开找到两处

default-character-set 都设置成=utf8，但是我的还是乱码，最后 6.以上是我的个人总结，有可能很肤浅，不要见笑，有问题共同解决，谢谢~

转自：http://www.poluoluo.com/jzxy/201304/202859.html

转载于:https://www.cnblogs.com/ChineseMoonGod/p/5152307.html

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