C #을 - 매개 변수 범용 데이터 액세스 클래스와 SQL 문의 수

최신 정보()

 

 

GetSingleResult ()

 

 

 

대해 getReader ()

 

 

 

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  1  이용 시스템;
  2  사용 System.Collections.Generic 단계;
  (3)  사용 을 System.Linq 단계;
  4  사용 System.Text 단계;
  5  이용 System.Data 단계;
  (6)  사용 의 System.Data.SQLClient 단계;
  7  사용 System.Configuration 단계;
  8  
  9  
10  스페이스 DAL.Helper
 11  {
 12 개      공용  클래스 SQLHelper
 13      {
 14          개인  정적  스트링 connString =
 15             ConfigurationManager.ConnectionStrings["sqlConnString"].ToString();       
 16 
 17         #region 执行带参数SQL语句
 18         /// <summary>
 19         /// 执行增、删、改 Sql(Update、insert、delete)方法
 20         /// </summary>
 21         /// <param name="sql">提交的SQL语句，可以根据需要添加参数</param>
 22         /// <param name="param">参数数组（如果没有参数，请传递null）</param>
 23         /// <returns>返回受影响行数</returns>
 24         public static int Update(string sql,SqlParameter[] param)
 25         {
 26             SqlConnection conn = new SqlConnection(connString);
 27             SqlCommand cmd = new SqlCommand(sql, conn);
 28             if(param != null)
 29             {
 30                 cmd.Parameters.AddRange(param);//添加参数组
 31             }
 32             try
 33             {
 34                 conn.Open();
 35                 return cmd.ExecuteNonQuery();
 36             }
 37             catch (Exception ex)
 38             {
 39                 string info = "执行public static int Update";
 40                 info += "(string sql,SqlParameter[] param)"+ex.Message;
 41                 throw new Exception(info);
 42             }
 43             finally
 44             {
 45                 conn.Close();
 46             }           
 47         }
 48         /// <summary>
 49         /// 执行单一结果集查询
 50         /// </summary>
 51         /// <param name="sql">提交SQL语句，可根据需要添加参数</param>
 52         /// <param name="param">参数数组，（如果没有参数、传递null）</param>
 53         /// <returns>返回object对象</returns>
 54         public static object GetSingleResult(string sql, SqlParameter[] param)
 55         {
 56             SqlConnection conn = new SqlConnection(connString);
 57             SqlCommand cmd = new SqlCommand(sql, conn);
 58             if(param != null)
 59             {
 60                 cmd.Parameters.AddRange(param);//添加参数组；
 61             }
 62             try
 63             {
 64                 conn.Open();
 65                 return cmd.ExecuteScalar();
 66             }
 67             catch (Exception ex)
 68             {
 69                 string info = "执行public static object GetSingleResult";
 70                 info += "(string sql, SqlParameter[] param)" + ex.Message;
 71                 throw new Exception(info);
 72             }
 73             finally
 74             {
 75                 conn.Close();
 76             }
 77         }
 78         /// <summary>
 79         /// 返回全部结果集查询
 80         /// </summary>
 81         /// <param name="sql"></param>
 82         /// <param name="param"></param>
 83         /// <returns></returns>
 84         public static SqlDataReader GetReader(string sql,SqlParameter[] param)
 85         {
 86             SqlConnection conn = new SqlConnection(connString);
 87             SqlCommand cmd = new SqlCommand(sql, conn);
 88             if(param != null)
 89             {
 90                 cmd.Parameters.AddRange(param);//添加参数组；
 91             }
 92             try
 93             {
 94                 conn.Open();
 95                 return cmd.ExecuteReader(CommandBehavior.CloseConnection);
 96             }
 97             catch (Exception ex)
 98             {
 99                 string info = "public static SqlDataReader GetReader";
100                     info +="(string sql,SqlParameter[] param)"+ex.Message;
101                 conn.Close();
102                 throw new Exception(info);
103 
104             }
105         }
106         #endregion
107 
108 
109 
110 
111 
112 
113 
114     }
115 }

原创地址：https://blog.csdn.net/qq_36482772/article/details/77987207