通过泛型数据,操作SQL数据库

   本人在操作数据库的时候,采用将对象的形式操作传入数据库,经过大量百度和朋友帮助,总结出如下两个接口。用于插入数据,提取数据。

 要这样操作的前提条件,就是类名和表名一致,类字段和表字段一致就可以了

 

        /// <summary>     

       /// 插入一个数据       

       /// </summary>        

      /// <param name="pole">需要插入的数据</param>       

      /// <returns></returns>    

     public int Insert<T>(T pole)       

  {         

    string strconn = DBHelp.GetDBConnection();         

    string strSQL = "INSERT INTO " + typeof(T).Name + " VALUES (";     

        FieldInfo[] entityFilds = typeof(T).GetFields();        

     for (int i = 0; i < entityFilds.Length; i++)           

  {           

      FieldInfo field = entityFilds[i];     

            if (field.FieldType.Name.ToLower() == "string")      

           {             

        strSQL += "'" + field.GetValue(pole) + "',";          

       }          

       else       

          {       

              strSQL += field.GetValue(pole) + ",";              

   }      

       }        

     strSQL = strSQL.TrimEnd(',') + ")";

            int intRtn = DBHelp.ExeSqlCommand(strSQL, strconn);    

         return intRtn;    

     }      

 

 

   /// <summary>       

  /// 获取当前数据     

    /// </summary>   

      /// <typeparam name="T"></typeparam>        

/// <returns></returns>    

     public IList<T> getPoleLst<T>()   

      {   

          IList<T> _lst = new List<T>();

            string strconn = DBHelp.GetDBConnection();

            string strSQL = "select * from " + typeof(T).Name;

            DataSet ds = DBHelp.GetDataSet(strSQL, strconn);

            if (ds.Tables != null && ds.Tables.Count > 0)         

    {             

    DataTable dt = ds.Tables[0];        

         FieldInfo[] entityFilds = typeof(T).GetFields();       

          T t = Activator.CreateInstance<T>();//创建一个T对象       

          foreach (DataRow dr in dt.Rows)            

     {                

     //通过属性集合迭代出每一个属性对象  

                   foreach (FieldInfo item in entityFilds)   

                  {                        

//循环迭代出DataTable的每一列             

            for (int j = 0; j < dt.Columns.Count; j++)        

                 {                   

          //判断当前迭代出的属性名称是否和迭代出的DataTable的列名称一致     

                        if (item.Name.ToLower().Equals(dt.Columns[j].ColumnName.ToLower()))           

                  {                        

         //判断当前DataTable的单列值是否为null         

                        if (dr[j] != DBNull.Value)         

                        {                                

     //根据实际对象的字段类型转换             

                        string itemTypeName = item.FieldType.Name.ToLower();

                                    object value = new object();

                                    switch (itemTypeName)

                                    {

                                        case "uint16":                                             value = Convert.ToUInt16(dr[j]);                                             break;                                         case "uint32":                                             value = Convert.ToUInt32(dr[j]);                                             break;                                         case "uint64":                                             value = Convert.ToUInt64(dr[j]);                                             break;                                         default:                                             value = dr[j];                                             break;      

                               }

                                    item.SetValue(t, value);//将当前DataTable的单列值赋予相匹配的属性,否则赋予一个null值.            

                     }                          

       else  

                                   item.SetValue(t, null);

                                break;

                            }

                        }  

                   }  

                   _lst.Add(t);

                }   

          }     

        ds.Dispose();

            return _lst;   

      }

 

posted on 2015-10-27 11:17  才哥哥  阅读(737)  评论(0编辑  收藏  举报

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