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  • Asp.Net操作MySql数据库增删改查

    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)


    1. MySQL 5.6 for Windows 解压缩版配置安装
      MySQL 5.6 for Windows 解压缩版配置安装
    2.  

      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

      MySQL 5.6 for Windows 解压缩版配置安装
      MySQL 5.6 for Windows 解压缩版配置安装
    3.  

      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。

      MySQL 5.6 for Windows 解压缩版配置安装
    4.  

      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!

      MySQL 5.6 for Windows 解压缩版配置安装

    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

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  • 原文地址:https://www.cnblogs.com/Gxiaopan/p/6292556.html
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