三层 增删改查 分页 泛型基类

  1    /// <summary>
  2     /// DAL基类
  3     /// </summary>
  4     /// <typeparam name="T"></typeparam>
  5     public abstract class BaseDAL<T> where T : class, new()
  6     {
  7         /// <summary>
  8         /// 获取单一模型
  9         /// </summary>
 10         /// <param name="t">模型对象</param>
 11         /// <returns></returns>
 12         public T GetModel(T t)
 13         {
 14             string sql = GetSQLstr(t, "model");
 15             SqlParameter[] sp = GetSqlParameter(t);
 16             DataTable dt = SQLHelperNew.ExecuteDataTable(sql, sp);
 17             if (dt.Rows.Count > 0)
 18             {
 19                 return DataTableToModel(dt.Rows[0]);
 20             }
 21             else
 22             {
 23                 return new T();
 24             }
 25 
 26         }
 27         /// <summary>
 28         /// 获取模型集合
 29         /// </summary>
 30         /// <param name="pageindex">当前页</param>
 31         /// <param name="pageSize">每页条数</param>
 32         /// <param name="orderStr">排序字符</param>
 33         /// <returns></returns>
 34         public List<T> GetModelList(T t, int pageindex, int pageSize, string orderStr)
 35         {
 36             string sql = GetSQLstrList(t, pageindex, pageSize, orderStr);
 37             SqlParameter[] sp = GetSqlParameter(t);
 38             DataTable dt = SQLHelperNew.ExecuteDataTable(sql, sp);
 39             if (dt.Rows.Count > 0)
 40             {
 41                 return DataTableToModelList(dt);
 42             }
 43             else
 44             {
 45                 return new List<T>();
 46             }
 47 
 48         }
 49 
 50         /// <summary>
 51         /// 添加模型
 52         /// </summary>
 53         /// <param name="t">模型对象</param>
 54         /// <returns></returns>
 55         public int AddModel(T t)
 56         {
 57             string sql = GetSQLstr(t, "add");
 58             SqlParameter[] sp = GetSqlParameter(t);
 59             return SQLHelperNew.ExecuteNonQuery(sql, sp);
 60         }
 61         /// <summary>
 62         /// 删除模型
 63         /// </summary>
 64         /// <param name="t">模型对象</param>
 65         /// <returns></returns>
 66         public int DeleteModel(T t)
 67         {
 68             string sql = GetSQLstr(t, "delete");
 69             SqlParameter[] sp = GetSqlParameter(t);
 70             return SQLHelperNew.ExecuteNonQuery(sql, sp);
 71         }
 72         /// <summary>
 73         /// 修改模型
 74         /// </summary>
 75         /// <param name="t">模型对象</param>
 76         /// <returns></returns>
 77         public int EditModel(T t)
 78         {
 79             string sql = GetSQLstr(t, "edit");
 80             SqlParameter[] sp = GetSqlParameter(t);
 81             return SQLHelperNew.ExecuteNonQuery(sql, sp);
 82         }
 83         /// <summary>
 84         /// 获取最大条数
 85         /// </summary>
 86         /// <param name="t">模型对象</param>
 87         /// <returns></returns>
 88         public int GetModelMaxCount(T t)
 89         {
 90             string sql = GetSQLstr(t, "max");
 91             SqlParameter[] sp = GetSqlParameter(t);
 92             return (int)SQLHelperNew.ExecuteScalar(sql, sp);
 93         }
 94 
 95         /// <summary>
 96         /// 根据数据表返回模型集合
 97         /// </summary>
 98         /// <param name="dt"></param>
 99         /// <returns></returns>
100         public abstract List<T> DataTableToModelList(DataTable dt);
101         /// <summary>
102         /// 根据数据表返回模型
103         /// </summary>
104         /// <param name="dt"></param>
105         /// <returns></returns>
106         public abstract T DataTableToModel(DataRow dt);
107         /// <summary>
108         /// 返回SQL语句
109         /// </summary>
110         /// <returns></returns>
111         public abstract string GetSQLstr(T t, string type);
112         /// <summary>
113         /// 返回SQL语句参数
114         /// </summary>
115         /// <param name="t">模型</param>
116         /// <returns></returns>
117         public abstract SqlParameter[] GetSqlParameter(T t);
118 
119         /// <summary>
120         /// 返回SQL语句
121         /// </summary>
122         /// <param name="sql">SQL语句</param>
123         /// <param name="t">模型</param>
124         /// <returns></returns>
125         protected abstract string CreateSQL(string sql, T t, string type);
126 
127         /// <summary>
128         /// 获取 分页SQL字符串
129         /// </summary>
130         /// <param name="t">模型</param>
131         /// <param name="pageindex">起始项</param>
132         /// <param name="pageSize">每页条数</param>
133         /// <param name="orderStr">排序字符</param>
134         /// <returns></returns>
135         public abstract string GetSQLstrList(T t, int pageindex, int pageSize, string orderStr);
136     }
137 }