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

javascript 倒计数功能
最近在项目中遇到一个倒计时功能,在网上没有找到合适的,就自己写了个方法.贴在这里,权且当个记录. export const timeRun = (timeStr, callBack) => { ...
PHP正则表达式二分法实现mysql盲注脚本
$sUrl = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'; $sPost = 'inject=Inject&injection='; $sCharset = 'AB ...
SpringBoot 动态更新 resources 目录的文件
一.前言 SpringBoot 打成 Jar 包形式运行后 ,resources 目录下文件的读取修改和原来不太一样,网上比较多的是关于读取的方式,修改的几乎没有,终于在 stackoverflow ...
Ext.isNumber与Ext.isNumeric
Ext.isNumber: Ext.isNumber(1) true Ext.isNumber(new Number(1)) false Ext.isNumber("1") fal ...
html 微信video放大后无法返回问题
android video播放视频放大后无法返回,先debug下debugx5.qq.com 发现用的不是X5内核直接激活 debugmm.qq.com/?forcex5=true 问题解决 ...
《JavaScript高级程序设计》笔记：DOM（十）
Node类型 nodeType以下是一些重要的nodeType的取值:1: 元素element2: 属性attr3: 文本text8: 注释comments9: 文档document nodeName ...
生鲜配送管理系统_升鲜宝V2.0 价格组功能操作说明_15382353715
价格组功能是B端供应链系统,必不可少的一个功能,其主要实现不同的客户不同的价格,B端系统有一个最大的不同就是,有些商品后台下单人员能看到的.有些商品在销售的那一瞬间,还不知道价格.所以这些商品只有后台 ...
【Linux】【MySQL】CentOS7、MySQL8.0.13 骚操作速查笔记——专治各种忘词水土不服
1.前言 [Linux][MySQL]CentOS7安装最新版MySQL8.0.13(最新版MySQL从安装到运行) 专治各种忘词,各种水土不服. - -,就是一个健忘贵的速查表:(当然不包括SQL的 ...
K邻近回归算法
代码: # -*- coding: utf-8 -*- """ Created on Fri Jul 13 10:40:22 2018 @author: zhen &qu ...
C语言面试程序阅读整理
一.数组和指针 1.数组和指针的存储写出下面的输出结果: char str1[] = "abc"; char str2[] = "abc"; const ch ...

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