C#：SQLServer数据库交互工具类

封装的工具类，提供ExectuNoQurey、ExecuteScalar、ExecuteReader、ExecuteSqlDataAdapter四中与数据库交互的方法。

ExectuNoQurey()方法：用于增、删、改数据

ExecuteScalar()方法： 用于单个数据查询

ExecuteReader()方法：用于读取多行数据，通过SqlDataReader类型数据返回

ExecuteSqlDataAdapter()方法：用于读取多行数据，通过DataTable类型数据返回

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 _03登入MD5
{
   public static class SqlHelper
    {
        public static readonly string conStr = ConfigurationManager.ConnectionStrings["strConn"].ConnectionString;
        /// 

        /// 增删该数据
        /// 
        /// Sql语句
        /// Sql语句类型：存储过程或是Sql语句
        /// 语句带的参数
        /// 返回影响行数
        public static int ExectuNoQurey(string sqlStr, CommandType commandtyp, params SqlParameter[] pars)
        {

            using (SqlConnection conn = new SqlConnection(conStr))
            {
                using (SqlCommand comm = new SqlCommand(sqlStr, conn))
                {

                    comm.CommandType = commandtyp;  // 设置接收的是 存储过程，还是SQL语句
                    comm.Parameters.AddRange(pars);  //设置参数
                    conn.Open();
                    int count = comm.ExecuteNonQuery();
                    return count;
                }
            }
        
        }
        /// 

        /// 单个查询
        /// 
        /// Sql语句
        /// Sql语句类型：存储过程或是Sql语句
        /// 语句带的参数
        /// 返回单个值
        public static object ExecuteScalar(string sqlStr, CommandType commandType, params SqlParameter[] pars)
        {
            using (SqlConnection conn = new SqlConnection(conStr))
            {
                using (SqlCommand comm = new SqlCommand(sqlStr, conn))
                {
                    comm.CommandType = commandType;
                    comm.Parameters.AddRange(pars);
                    conn.Open();
                    return comm.ExecuteScalar();
                }
            }
        }
        /// 

        /// 读取多行数据
        /// 
        /// Sql语句
        /// Sql语句类型：存储过程或是Sql语句
        /// 语句带的参数
        /// 返回 多行数据
        public static SqlDataReader ExecuteReader(string sqlStr, CommandType commandType, params SqlParameter[] pars)
        {

            SqlConnection conn = new SqlConnection(conStr);
            using (SqlCommand comm = new SqlCommand(sqlStr, conn))
            {
                comm.CommandType = commandType;
                comm.Parameters.AddRange(pars);
                conn.Open();
                try
                {
                    return comm.ExecuteReader();
                }
                catch (Exception)
                {
                    conn.Close();
                    conn.Dispose();
                    throw;
                }
            }
        }
        /// 

        /// 读出数据，返回表格Table
        /// 
        /// 
        /// 
        /// 
        /// 
        public static DataTable ExecuteSqlDataAdapter(string sqlStr, CommandType commandType, params SqlParameter[] pars)
        {
            DataTable td = new DataTable();
            using (SqlDataAdapter sda = new SqlDataAdapter(sqlStr, conStr))
            {
                if (pars != null)
                {
                    sda.SelectCommand.CommandType = commandType;
                    sda.SelectCommand.Parameters.AddRange(pars);
                    sda.Fill(td);
                }
            }
            return td;
        }
    }
}