DBHelper类

本文介绍了一个.NET框架下的简单数据库辅助类库,提供了连接数据库、执行SQL命令(包括增删改查)、执行存储过程等功能。该库使用SqlConnection进行数据库连接,并通过SqlCommand执行SQL语句。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;

namespace TMDAL
{
    static class DBHelper
    {
        //创建连接对象
        public static SqlConnection CreateConn()
        {
            //读取app.config文件内的链接字符串
            string strConn = ConfigurationManager.ConnectionStrings["conn"].ConnectionString;
            SqlConnection conn = new SqlConnection(strConn);
            return conn;
        }
        //增、删、改
        public static int ExecuteNonQuery(string sql,SqlParameter[] pars)
        {
            using(SqlConnection conn = CreateConn())
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand(sql, conn);
                if (pars != null)
                {
                    cmd.Parameters.AddRange(pars);
                }
                int count = cmd.ExecuteNonQuery();
                conn.Close();
                return count;
            }
        }
        //单值查询
        public static object ExecuteScalar(string sql,SqlParameter[] pars)
        {
            using (SqlConnection conn = CreateConn())
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand(sql, conn);
                if (pars != null)
                {
                    cmd.Parameters.AddRange(pars);
                }
                object obj = cmd.ExecuteScalar();
                conn.Close();
                return obj;
            }
        }
        //多值查询:返回一行数据
        public static SqlDataReader ExecuteReader(string sql,SqlParameter[] pars)
        {
            SqlConnection conn = CreateConn();
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            //判断参数数组是否为空
            if (pars != null)
            {
                cmd.Parameters.AddRange(pars);
            }
            SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return sdr;
        }
        //多值查询:返回多行数据
        public static DataSet QueryAll(string sql, SqlParameter[] pars)
        {
            using (SqlConnection conn = CreateConn())
            {
                SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
                if (pars != null)
                {
                    sda.SelectCommand.Parameters.AddRange(pars);
                }
                DataSet ds = new DataSet();
                sda.Fill(ds, "temp");
                return ds;
            }
        }
        //执行存储过程
        public static SqlDataReader ExecuteProc(string procName,SqlParameter[] pars)
        {
            SqlConnection conn = CreateConn();
            conn.Open();
            SqlCommand cmd = new SqlCommand(procName,conn);
            if (pars != null)
            {
                cmd.Parameters.AddRange(pars);
            }
            cmd.CommandType = CommandType.StoredProcedure;
            SqlDataReader sdr = cmd.ExecuteReader();
            return sdr;
        }
    }
}

评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值