Asp.Net操作MySql数据库增删改查,话不多说直接步入正题。git源码地址:https://git.oschina.net/gxiaopan/NetMySql.git
1、安装MySQL数据库系统,目前最新版本为5.7.17,可以到官网 http://dev.mysql.com/downloads/mysql/ 下载安装,注意安装选择Microsoft Windows平台;
msi格式直接可视化安装即可,zip格式是自己解压,解压缩之后其实MySQL就可以使用了,但是要进行配置,
配置环境变量很简单:
我的电脑->属性->高级->环境变量
选择PATH,在其后面添加: 你的mysql bin文件夹的路径 (如:C:Program FilesMySQLMySQL Server 5.6in )
PATH=.......;C:Program FilesMySQLMySQL Server 5.6in (注意是追加,不是覆盖)
配置完环境变量之后先别忙着启动mysql,我们还需要修改一下配置文件(如果没有配置,之后启动的时候就会出现图中的错误哦!:错误2 系统找不到文件),mysql-5.6.1X默认的配置文件是在C:Program FilesMySQLMySQL Server 5.6my-default.ini,或者自己建立一个my.ini文件,
在其中修改或添加配置(如图):
[mysqld]
basedir=C:Program FilesMySQLMySQL Server 5.6(mysql所在目录)
datadir=C:Program FilesMySQLMySQL Server 5.6data (mysql所在目录data)
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以管理员身份运行cmd(一定要用管理员身份运行,不然权限不够),
输入:cd C:Program FilesMySQLMySQL Server 5.6in 进入mysql的bin文件夹(不管有没有配置过环境变量,也要进入bin文件夹,否则之后启动服务仍然会报错误2)
输入mysqld -install(如果不用管理员身份运行,将会因为权限不够而出现错误:Install/Remove of the Service Denied!)
安装成功
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安装成功后就要启动服务了,继续在cmd中输入:net start mysql(如图),服务启动成功!
此时很多人会出现错误,请看注意:
注意:这个时候经常会出现错误2和错误1067。
如果出现“错误2 系统找不到文件”,检查一下是否修改过配置文件或者是否进入在bin目录下操作,如果配置文件修改正确并且进入了bin文件夹,需要先删除mysql(输入 mysqld -remove)再重新安装(输入 mysqld -install);
如果出现错误1067,那就是配置文件修改错误,确认一下配置文件是否正确。
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服务启动成功之后,就可以登录了,如图,输入mysql -u root -p(第一次登录没有密码,直接按回车过),登录成功!
2、引用MySQL connector/Net组件,该组件在安装MySQL安装目录内,比如本人电脑上的目录是:
D:Program Files (x86)MySQLConnector NET 6.7.4Assembliesv4.5MySQL.Data.dll
或者到官网上下载 http://dev.mysql.com/downloads/connector/net/ 最新版本的MySQL connector/Net组件
需要说明的是,如果在正常安装MySQL数据库后,又更新了MySQL Connector/Net组件,则会出现版本不同的问题,这需要将ASP.NET中machine.config里面关于MySQL引用 MySQL Connector/Net组件版本的语句注释掉即可;
引用 MySQL connector/Net组件的办法是在ASP.NET项目引用中添加地MySQL.Data.dll的引用,如下图所示:
3、使用下面的代码完成对数据库的连接:
在web.config中配置连接字符串完成对MySQL数据库的连接
<connectionStrings>
<add name="DBConnection" connectionString="server=localhost;user id=root;password=123456;database=MySqlDatabaseName; pooling=true;" providerName="MySql.Data.MySqlClient" />
</connectionStrings>
编写C#操作
MysqlHelper类:
MysqlHelper类 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 /// <summary> /// 执行SQL语句,返回影响的记录数 /// </summary> /// <param name="SQLString">SQL语句</param> /// <returns>影响的记录数</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> /// 执行SQL语句,返回影响的记录数 /// </summary> /// <param name="SQLString">SQL语句</param> /// <returns>影响的记录数</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; } } } } //执行多条SQL语句,实现数据库事务。 /// <summary> /// 执行多条SQL语句,实现数据库事务。 /// </summary> /// <param name="SQLStringList">多条SQL语句</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> /// 执行一条计算查询结果语句,返回查询结果(object)。 /// </summary> /// <param name="SQLString">计算查询结果语句</param> /// <returns>查询结果(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> /// 执行一条计算查询结果语句,返回查询结果(object)。 /// </summary> /// <param name="SQLString">计算查询结果语句</param> /// <returns>查询结果(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> /// 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 ) /// </summary> /// <param name="strSQL">查询语句</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> /// 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 ) /// </summary> /// <param name="strSQL">查询语句</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> /// 执行查询语句,返回DataTable /// </summary> /// <param name="SQLString">查询语句</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> /// 执行查询语句,返回DataSet /// </summary> /// <param name="SQLString">查询语句</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]; } } } //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 /// <summary> /// 获取分页数据 在不用存储过程情况下 /// </summary> /// <param name="recordCount">总记录条数</param> /// <param name="selectList">选择的列逗号隔开,支持top num</param> /// <param name="tableName">表名字</param> /// <param name="whereStr">条件字符 必须前加 and</param> /// <param name="orderExpression">排序 例如 ID</param> /// <param name="pageIdex">当前索引页</param> /// <param name="pageSize">每页记录数</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, @"tops+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 } }
git源码地址:https://git.oschina.net/gxiaopan/NetMySql.git