Common/DBHelp.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Common
{
    public class DBHelp
    {
        public static string sqlCon = "Data Source=.;Initial Catalog=Person_DB;Integrated Security=True";
        /// <summary>
        /// 查询所有数据
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static SqlDataReader SelectData(string sql)
        {
            SqlConnection conn = new SqlConnection(sqlCon);
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return dr;
        }
        /// <summary>
        /// 添加数据
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static int AddData(string sql)
        {
            SqlConnection conn = new SqlConnection(sqlCon);
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            int num = cmd.ExecuteNonQuery();
            conn.Close();
            return num;
        }
        /// <summary>
        /// 修改数据
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static int UpdateDate(string sql)
        {
            SqlConnection conn = new SqlConnection(sqlCon);
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            int num = cmd.ExecuteNonQuery();
            conn.Close();
            return num;
        }
        /// <summary>
        /// 删除数据
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static int DeleteDate(string sql)