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  • sql helper

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Configuration;
    using System.Data.SqlClient;
    using System.Data;
    
    namespace _02使用md5登录
    {
        public static class SqlHelper
        {
            private static readonly string constr = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;
    
            #region 01执行增删改
            //执行增删改
            public static int ExecuteNonQuery(string sql, params SqlParameter[] pms)
            {
                int res = -1;
                using (SqlConnection con = new SqlConnection(constr))
                {
                    using (SqlCommand cmd = new SqlCommand(sql, con))
                    {
                        if (pms != null)
                        {
                            cmd.Parameters.AddRange(pms);
                        }
                        con.Open();
                        res = cmd.ExecuteNonQuery();
                    }
                    return res;
                }
            } 
            #endregion
    
    
            #region 02返回单个值的方法
            //返回单个值的方法
            public static object ExecuteScalar(string sql, params SqlParameter[] pms)
            {
                using (SqlConnection con = new SqlConnection(constr))
                {
                    using (SqlCommand cmd = new SqlCommand(sql, con))
                    {
                        if (pms != null)
                        {
                            cmd.Parameters.AddRange(pms);
                        }
                        con.Open();
                        return cmd.ExecuteScalar();
                    }
                }
            }
            
            #endregion
            #region 03封装返回DataReader的方法
            //封装返回DataReader的方法
            public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] pms)
            {
                SqlConnection con = new SqlConnection(constr);
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
    
                    return cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }
            } 
            #endregion
    
            #region 04封装一个执行DataTable的方法
            //封装一个执行DataTable的方法
            public static DataTable ExecuteDataTable(string sql, params SqlParameter[] pms)
            {
                DataTable dt = new DataTable();
                using (SqlDataAdapter adapter = new SqlDataAdapter(sql, constr))
                {
                    if (pms != null)
                    {
                        adapter.SelectCommand.Parameters.AddRange(pms);
                    }
                    adapter.Fill(dt);
                }
                return dt;
            } 
            #endregion
            #region 05执行分页的方法
            public static DataTable GetPageTable(int pageIndex, int pageSize, out int rowCount, out int pageCount, bool isDel)
            {
                DataTable dt = new DataTable();
                rowCount = 0;
                pageCount = 0;
                using (SqlConnection conn = new SqlConnection(constr))
                {
                    SqlDataAdapter dat = new SqlDataAdapter("up_GetPagedData2", conn);
                    SqlParameter[] paras ={
                                         new SqlParameter("@pageIndex",pageIndex),
                                         new SqlParameter("@pageSize",pageSize),
                                         new SqlParameter("@rowCount",rowCount),
                                         new SqlParameter("@pageCount",pageCount),                                     
                                         new SqlParameter("@isDel",isDel)                                     
                                         };
                    //将两个输出参数的输出方向指定
                    paras[2].Direction = ParameterDirection.Output;
                    paras[3].Direction = ParameterDirection.Output;
                    //将参数集合加入到岔村命令对象中
                    dat.SelectCommand.Parameters.AddRange(paras);
                    //设置查询命令类型为存储过程
                    dat.SelectCommand.CommandType = CommandType.StoredProcedure;
                    //执行存储过程
                    dat.Fill(dt);
                    //执行完后,将存储过程中获得的两个输出参数值赋给此方法的两个输出参数
                    rowCount = Convert.ToInt32(paras[2].Value);
                    pageCount = Convert.ToInt32(paras[3].Value);
    
                }
                return dt;
            } 
            #endregion
        }
    }
    
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  • 原文地址:https://www.cnblogs.com/mingjian/p/3413314.html
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