ADO.Net笔记整理（一）

几次装机，Notes已烟消云散，近日因为Node.js死活搞不定，无奈装机，备份好的东东，没想到磁盘扇区出现异常，可能是PE启动盘的病毒，只好将磁盘全部重新分区，恢复数据也懒得恢复了,日积月累关乎将来的开发效率，还好处于懵懂阶段。笔记一大堆，记忆力又不怎么好，所以web+log=blog;

SqlHelper类

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace DAL

{

/// <summary>

/// SqlHelper类 by zy 2016-3-11

/// </summary>

public class SqlHelper

{
     //如果项目中只连接了一个数据库那么可以在此定义一个固定的连接字符串

    public static string ConnectionStr { get; } =

        ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;

    public static string ConnStr()

    {

        return ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;

    }

    #region ExecuteNonQuery

    /// <summary>

    /// 执行sql语句返回受影响行数

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="cmdType">command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        using (SqlConnection conn = new SqlConnection(connectionString))

        {

            PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

            int val = cmd.ExecuteNonQuery();

            cmd.Parameters.Clear();

            return val;

        }

    }

    /// <summary>

    /// 执行sql语句返回当前插入的记录id(其实是ExecuteScalar转换成id返回)

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="cmdType">command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="returnID">返回id</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText,

        out int returnID, params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        using (SqlConnection conn = new SqlConnection(connectionString))

        {

            returnID = 0;

            PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

            returnID = (Int32) cmd.ExecuteScalar();

            cmd.Parameters.Clear();

            return returnID;

        }

    }

    /// <summary>

    /// 执行sql语句返回受影响行数(数据库连接SqlConnection)

    /// </summary>

    /// <param name="connection">SqlConnection连接</param>

    /// <param name="cmdType">command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

        int val = cmd.ExecuteNonQuery();

        cmd.Parameters.Clear();

        return val;

    }

    /// <summary>

    /// 执行sql语句返回受影响行数(事务SqlTransaction)

    /// </summary>

    /// <param name="trans">SqlTransaction事务</param>

    /// <param name="cmdType">command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);

        int val = cmd.ExecuteNonQuery();

        cmd.Parameters.Clear();

        return val;

    }

    #endregion

    #region ExecuteScalar

    /// <summary>

    /// 执行sql语句返回结果集第一行第一列

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="cmdType">Command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        using (SqlConnection connection = new SqlConnection(connectionString))

        {

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

            object val = cmd.ExecuteScalar();

            cmd.Parameters.Clear();

            return val;

        }

    }

    /// <summary>

    /// 执行sql语句返回结果集第一行第一列(事务)

    /// </summary>

    /// <param name="trans">SqlTransaction事务</param>

    /// <param name="cmdType">Command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static object ExecuteScalar(SqlTransaction trans, CommandType cmdType, string cmdText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);

        object val = cmd.ExecuteScalar();

        cmd.Parameters.Clear();

        return val;

    }

    /// <summary>

    /// 执行sql语句返回结果集第一行第一列(数据库连接)

    /// </summary>

    /// <param name="connection">SqlConnection连接</param>

    /// <param name="cmdType">Command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

        object val = cmd.ExecuteScalar();

        cmd.Parameters.Clear();

        return val;

    }

    #endregion

    #region ExecuteReader

    /// <summary>

    /// 执行sql语句返回reader

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="cmdType">command类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        SqlConnection conn = new SqlConnection(connectionString);

        try

        {

            PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

            SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

            cmd.Parameters.Clear();

            return rdr;

        }

        catch

        {

            conn.Close();

            throw;

        }

    }

    #endregion

    #region DataSet

    /// <summary>

    /// 执行sql语句返回DataSet结果集(无参数)

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="commandType">command类型</param>

    /// <param name="commandText">sql语句</param>

    /// <returns></returns>

    public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)

    {

        return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[]) null);

    }

    /// <summary>

    /// 执行sql语句返回DataSet结果集

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="commandType">command类型</param>

    /// <param name="commandText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText,

        params SqlParameter[] commandParameters)

    {

        //创建数据库连接完成后dispose

        using (SqlConnection cn = new SqlConnection(connectionString))

        {

            cn.Open();

            //根据数据库连接调用具体方法

            return ExecuteDataset(cn, commandType, commandText, commandParameters);

        }

    }

    /// <summary>

    /// 执行sql语句返回DataSet结果集(数据库连接SqlConnection)

    /// </summary>

    /// <param name="connection">SqlConnection连接</param>

    /// <param name="commandType">command类型</param>

    /// <param name="commandText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText,

        params SqlParameter[] commandParameters)

    {

        //创建command

        SqlCommand cmd = new SqlCommand();

        //准备command对象

        PrepareCommand(cmd, connection, (SqlTransaction) null, commandType, commandText, commandParameters);

        //创建SqlDataAdapter和DataSet

        SqlDataAdapter da = new SqlDataAdapter(cmd);

        DataSet ds = new DataSet();

        //把结果集装进dataset

        da.Fill(ds);

        //返回

        return ds;

    }

    #endregion DataSet

    #region DataTable

    /// <summary>

    /// 执行sql语句返回DataTable结果集(无参数)

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="commandType">command类型</param>

    /// <param name="commandText">sql语句</param>

    /// <returns></returns>

    public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)

    {

        return ExecuteDataTable(connectionString, commandType, commandText, (SqlParameter[])null);

    }

    /// <summary>

    /// 执行sql语句返回DataTable结果集

    /// </summary>

    /// <param name="connectionString">连接字符串</param>

    /// <param name="commandType">command类型</param>

    /// <param name="commandText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText,

        params SqlParameter[] commandParameters)

    {

        using (SqlConnection cn = new SqlConnection(connectionString))

        {

            cn.Open();

            return ExecuteDataTable(cn, commandType, commandText, commandParameters);

        }

    }

    /// <summary>

    /// 执行sql语句返回DataTable结果集

    /// </summary>

    /// <param name="connection">SqlConnection连接</param>

    /// <param name="commandType">command类型</param>

    /// <param name="commandText">sql语句</param>

    /// <param name="commandParameters">参数</param>

    /// <returns></returns>

    public static DataTable ExecuteDataTable(SqlConnection connection, CommandType commandType, string commandText,

        params SqlParameter[] commandParameters)

    {

        SqlCommand cmd = new SqlCommand();

        PrepareCommand(cmd, connection, (SqlTransaction) null, commandType, commandText, commandParameters);

        SqlDataAdapter da = new SqlDataAdapter(cmd);

        DataTable dt = new DataTable();

        da.Fill(dt);

        return dt;

    }

    #endregion DataTable

    #region PrepareCommand

    /// <summary>

    /// 准备Command对象

    /// </summary>

    /// <param name="cmd">SqlCommand 对象</param>

    /// <param name="conn">SqlConnection 对象</param>

    /// <param name="trans">SqlTransaction 对象</param>

    /// <param name="cmdType">Command 类型</param>

    /// <param name="cmdText">sql语句</param>

    /// <param name="cmdParms">参数</param>

    private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans,

        CommandType cmdType, string cmdText, SqlParameter[] cmdParms)

    {

        //打开SqlConnection连接

        if (conn.State != ConnectionState.Open)

            conn.Open();

        //给Command的Connection CommandText设置值

        cmd.Connection = conn;

        cmd.CommandText = cmdText;

        //如果是事务设置事务

        if (trans != null)

            cmd.Transaction = trans;

        //Command类型

        cmd.CommandType = cmdType;

        //Command参数

        if (cmdParms != null)

        {

            foreach (SqlParameter parm in cmdParms)

            {

                //在此可以操作参数比如把参数值里的英文逗号全部改为中文逗号或者其他操作

                switch (parm.SqlDbType)

                {

                    case SqlDbType.Char:

                    case SqlDbType.NChar:

                    case SqlDbType.NText:

                    case SqlDbType.NVarChar:

                    case SqlDbType.Text:

                    case SqlDbType.VarChar:

                        if (parm.Value != null && parm.Value != DBNull.Value && parm.ParameterName != "@SQLClause")

                        {

                            string tmp = parm.Value.ToString();

                            tmp = tmp.Replace(",", "，");

                            tmp = tmp.Replace("'", "＇");

                            parm.Value = tmp;

                        }

                        break;

                }

//把参数添加到Command中的Parameters中
                 cmd.Parameters.Add(parm);
             }
         }
     }

#endregion

}

}

原文地址不得，忘记哪里CV的了。

ADO.Net笔记整理（一）的更多相关文章

python学习笔记整理——字典
python学习笔记整理数据结构--字典无序的 {键:值} 对集合用于查询的方法 len(d) Return the number of items in the dictionary d. 返 ...
从0开始学Swift笔记整理（五）
这是跟在上一篇博文后续内容: --Core Foundation框架 Core Foundation框架是苹果公司提供一套概念来源于Foundation框架,编程接口面向C语言风格的API.虽然在Sw ...
Deep Learning（深度学习）学习笔记整理系列之（五）
Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04 ...
学习ReactNative笔记整理一___JavaScript基础
学习ReactNative笔记整理一___JavaScript基础 ★★★笔记时间- 2017-1-9 ★★★ 前言: 现在跨平台是一个趋势,这样可以减少开发和维护的成本.第一次看是看的ReactNa ...
Deep Learning（深度学习）学习笔记整理系列之（八）
Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04 ...
Deep Learning（深度学习）学习笔记整理系列之（七）
Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04 ...
Deep Learning（深度学习）学习笔记整理系列之（六）
Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04 ...
Deep Learning（深度学习）学习笔记整理系列之（四）
Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04 ...
Deep Learning（深度学习）学习笔记整理系列之（三）
Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04 ...

随机推荐

分布式缓存Hazelcast案例一
分布式缓存Hazelcast案例一 Hazelcast IMDG Architecture 今天先到这儿,希望对您技术领导力, 企业管理,物联网, 系统架构设计与评估,团队管理, 项目管理, 产品管 ...
ThreadPoolExecutor中的submit()方法详细讲解
https://blog.csdn.net/qq_33689414/article/details/72955253
.net面向对象设计原则
稳定的框架来源于好的设计,好的设计才能出好的作品,掌握面向对象基本原则才会使我们的设计灵活.合理.不僵化,今天就来谈一谈我们.net 面向对象设计的基本原则. 对于一个没有任何设计经验的开发者来说,如 ...
informix存储过程笔记
一.存储过程概述存储过程是一个用户定义的函数,由存储过程语句(SPL) 和一组SQL语句组成,以可以执行代码形式存储在数据库中,和表.视图.索引等一样,是数据库的一种对象. 存储过程语言SPL(St ...
vue 日期时间过滤器
来自:https://blog.csdn.net/m0_37068028/article/details/72898154 侵删来自:https://segmentfault.com/a/11900 ...
Jetty 开发指南：嵌入式开发示例
Jetty具有嵌入各种应用程序的丰富历史. 在本节中,我们将向您介绍我们的git存储库中的embedded-jetty-examples项目下的一些简单示例. 重要:生成此文档时,将直接从我们的git ...
Netty中ByteBuf的引用计数线程安全的实现原理
原文链接 Netty中ByteBuf的引用计数线程安全的实现原理代码仓库地址 ByteBuf 实现了ReferenceCounted 接口,实现了引用计数接口,该接口的retain(int) 方法为 ...
vue的组件化运用（数据在两个组件互传，小问题总结）
一.vue的组件化应用首先,知道有哪些相关的属性需要用到,再慢慢去理解,运用. 1.两个vue页面 2. slot占位符(可用可不用) 3.props内置属性 4.watch监听函数 5.impor ...
【已采纳】最快获取package和activity的方式
意外找到一个本人自认为是最快获取package和activity的方法,欢迎来辩! 用adb命令快速查看某应用appPackage及appActivity的方法(前提是需要用数据线连接真机\模拟器也可 ...
PL/SQL连接数据库时报错12154
研究了半天,最终我发现和环境变量没有半毛钱关系,就是tsnnames这个文件的格式错了.

ADO.Net笔记整理（一）

SqlHelper类

ADO.Net笔记整理（一）的更多相关文章

随机推荐

热门专题