• .NetCore学习笔记：二、基于Dapper的泛型Repository

    为减少代码量，这里实现一个基于Dapper的泛型Repository。

    这里需要引用Dapper.dll和Dapper.Contrib.dll。

    接口定义： 

     1 /// <summary>
 2 /// Repository接口
 3 /// </summary>
 4 /// <typeparam name="T"></typeparam>
 5 public interface IRepository<T> where T : class, IEntity
 6 {
 7     /// <summary>
 8     /// 查询
 9     /// </summary>
10     /// <typeparam name="T"></typeparam>
11     /// <param name="sql"></param>
12     /// <param name="param"></param>
13     /// <param name="commandType"></param>
14     /// <returns></returns>
15     IEnumerable<T> Query(string sql, object param = null, CommandType? commandType = null);
16 
17     /// <summary>
18     /// 删除行数据
19     /// </summary>
20     /// <typeparam name="T"></typeparam>
21     /// <param name="entity"></param>
22     /// <returns></returns>
23     bool Delete(T entity);
24     /// <summary>
25     /// 删除表所有数据
26     /// </summary>
27     /// <typeparam name="T"></typeparam>
28     /// <returns></returns>
29     bool DeleteAll();
30     /// <summary>
31     /// 获取行数据
32     /// </summary>
33     /// <typeparam name="T"></typeparam>
34     /// <param name="id"></param>
35     /// <returns></returns>
36     T Get(object id);
37     /// <summary>
38     /// 获取表的所有数据
39     /// </summary>
40     /// <typeparam name="T"></typeparam>
41     /// <returns></returns>
42     IEnumerable<T> GetAll();
43     /// <summary>
44     /// 添加行数据
45     /// </summary>
46     /// <typeparam name="T"></typeparam>
47     /// <param name="entity"></param>
48     /// <returns></returns>
49     long Insert(T entity);
50     /// <summary>
51     /// 更新行数据
52     /// </summary>
53     /// <typeparam name="T"></typeparam>
54     /// <param name="entity"></param>
55     /// <returns></returns>
56     bool Update(T entity);
57 
58     /// <summary>
59     /// 分页方法
60     /// </summary>
61     /// <param name="sql"></param>
62     /// <param name="pageIndex">当前页码</param>
63     /// <param name="pageSize">每页显示条数</param>
64     /// <param name="param">参数</param>
65     /// <param name="transaction"></param>
66     /// <param name="commandTimeout"></param>
67     /// <returns></returns>
68     PagedResult<T> GetPageList(string sql, int pageIndex, int pageSize, object param = null);
69 }

    接口实现：

      1 /// <summary>
  2 /// 泛型Repository
  3 /// </summary>
  4 /// <typeparam name="T"></typeparam>
  5 public class Repository<T> : IRepository<T> where T : class, IEntity
  6 {
  7     private IUnitOfWork _unitOfWork;
  8 
  9     public Repository(IUnitOfWork unitOfWork)
 10     {
 11         _unitOfWork = unitOfWork;            
 12     }
 13     /// <summary>
 14     /// 查询
 15     /// </summary>
 16     /// <typeparam name="T"></typeparam>
 17     /// <param name="sql"></param>
 18     /// <param name="param"></param>
 19     /// <param name="commandType"></param>
 20     /// <returns></returns>
 21     public IEnumerable<T> Query(string sql, object param = null, CommandType? commandType = null)
 22     {
 23         var r = _unitOfWork.DbConnection.Query<T>(sql, param: param, transaction: _unitOfWork.DbTransaction, commandType: commandType);
 24         return r;
 25     }
 26     /// <summary>
 27     /// 删除行数据
 28     /// </summary>
 29     /// <typeparam name="T"></typeparam>
 30     /// <param name="entityToDelete"></param>
 31     /// <returns></returns>
 32     public bool Delete(T entity)
 33     {
 34         var r = _unitOfWork.DbConnection.Delete<T>(entity, _unitOfWork.DbTransaction);
 35         return r;
 36     }
 37     /// <summary>
 38     /// 删除表所有数据
 39     /// </summary>
 40     /// <typeparam name="T"></typeparam>
 41     /// <returns></returns>
 42     public bool DeleteAll()
 43     {
 44         var r = _unitOfWork.DbConnection.DeleteAll<T>(_unitOfWork.DbTransaction);
 45         return r;
 46     }
 47     /// <summary>
 48     /// 获取行数据
 49     /// </summary>
 50     /// <typeparam name="T"></typeparam>
 51     /// <param name="id"></param>
 52     /// <returns></returns>
 53     public T Get(object id)
 54     {
 55         var r = _unitOfWork.DbConnection.Get<T>(id, _unitOfWork.DbTransaction);
 56         return r;
 57     }
 58     /// <summary>
 59     /// 获取表的所有数据
 60     /// </summary>
 61     /// <typeparam name="T"></typeparam>
 62     /// <returns></returns>
 63     public IEnumerable<T> GetAll()
 64     {
 65         var r = _unitOfWork.DbConnection.GetAll<T>(_unitOfWork.DbTransaction);
 66         return r;
 67     }
 68     /// <summary>
 69     /// 添加行数据
 70     /// </summary>
 71     /// <typeparam name="T"></typeparam>
 72     /// <param name="entity"></param>
 73     /// <returns></returns>
 74     public long Insert(T entity)
 75     {
 76         var r = _unitOfWork.DbConnection.Insert<T>(entity, _unitOfWork.DbTransaction);
 77         return r;
 78     }
 79     /// <summary>
 80     /// 更新行数据
 81     /// </summary>
 82     /// <typeparam name="T"></typeparam>
 83     /// <param name="entity"></param>
 84     /// <returns></returns>
 85     public bool Update(T entity)
 86     {
 87         var r = _unitOfWork.DbConnection.Update<T>(entity, _unitOfWork.DbTransaction);
 88         return r;
 89     }
 90     /// <summary>
 91     /// 分页方法
 92     /// </summary>
 93     /// <param name="sql"></param>
 94     /// <param name="pageIndex">当前页码</param>
 95     /// <param name="pageSize">每页显示条数</param>
 96     /// <param name="param">参数</param>
 97     /// <param name="transaction"></param>
 98     /// <param name="commandTimeout"></param>
 99     /// <returns></returns>
100     public PagedResult<T> GetPageList(string sql, int pageIndex, int pageSize, object param = null)
101     {
102        var pagingResult =  _unitOfWork.DbConnection.GetPageList<T>(sql, pageIndex, pageSize, param: param, transaction: _unitOfWork.DbTransaction);
103         return pagingResult;
104     }
105 }

    GetPageList为Dapper的一个分页扩展：

     1 /// <summary>
 2 /// 分页方法
 3 /// </summary>
 4 /// <param name="sql"></param>
 5 /// <param name="pageIndex">当前页码</param>
 6 /// <param name="pageSize">每页显示条数</param>
 7 /// <param name="param">参数</param>
 8 /// <param name="transaction"></param>
 9 /// <param name="commandTimeout"></param>
10 /// <returns></returns>
11 public static PagedResult<T> GetPageList<T>(this IDbConnection connection, string sql, int pageIndex, int pageSize, object param = null, IDbTransaction transaction = null, int? commandTimeout = null)
12 {
13     if (pageIndex < 1) pageIndex = 1;
14     if (pageSize < 1) pageSize = 20;
15     var startRow = (pageIndex - 1) * pageSize;
16 
17     //MySql分页
18     sql = $"SELECT * FROM ({sql}) tt1  LIMIT {startRow},{pageSize};  SELECT COUNT(1) FROM ({sql}) tt2;";
19 
20     PagedResult<T> pagingResult = new PagedResult<T>();
21     pagingResult.Paged.PageIndex = pageIndex;
22     pagingResult.Paged.PageSize = pageSize;
23     using (var result = connection.QueryMultiple(sql, param: param, transaction, commandTimeout))
24     {
25         var list = result.Read<T>();
26         var totalCount = result.Read<long>().FirstOrDefault();
27         pagingResult.Data = list;
28         pagingResult.Paged.TotalRow = totalCount;
29     }
30     return pagingResult;
31 }

    PagedResult类：

     1 /// <summary>
 2 /// 分页模型
 3 /// </summary>
 4 /// <typeparam name="T"></typeparam>
 5 public class PagedResult<T>
 6 {
 7     public PagedResult()
 8     {
 9         this.Paged = new Paged();
10     }
11 
12     /// <summary>
13     /// 结果
14     /// </summary>
15     public IEnumerable<T> Data { get; set; }
16 
17     /// <summary>
18     /// 分页数据，包含数据总行数、当前页码、页数据行数和总的分页数
19     /// </summary>
20     public Paged Paged { get; set; }
21 }

    Paged类：

     1 /// <summary>
 2 /// 分页数据
 3 /// </summary>
 4 public class Paged
 5 {
 6     /// <summary>
 7     /// 当前页码
 8     /// </summary>
 9     public int PageIndex { get; set; }
10     /// <summary>
11     /// 页数据行数
12     /// </summary>
13     public int PageSize { get; set; }
14     /// <summary>
15     /// 总行数
16     /// </summary>
17     public long TotalRow { get; set; }
18     /// <summary>
19     /// 总的分页数
20     /// </summary>
21     public int TotalPage
22     {
23         get
24         {
25             if (this.TotalRow > 0 && this.PageSize > 0)
26                 return (int)Math.Ceiling((decimal)this.TotalRow / this.PageSize);
27             else
28                 return 0;
29         }
30     }
31 }

     在IServiceCollection容器中注册：

    services.AddScoped(typeof(IRepository<>), typeof(Repository<>));
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  • 原文地址：https://www.cnblogs.com/mtxcat/p/12775056.html
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