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：
/// <summary> /// Repository接口 /// </summary> /// <typeparam name="T"></typeparam> public interface IRepository<T> where T : class, IEntity { /// <summary> /// 查询 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="commandType"></param> /// <returns></returns> IEnumerable<T> Query(string sql, object param = null, CommandType? commandType = null); /// <summary> /// 删除行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="entity"></param> /// <returns></returns> bool Delete(T entity); /// <summary> /// 删除表所有数据 /// </summary> /// <typeparam name="T"></typeparam> /// <returns></returns> bool DeleteAll(); /// <summary> /// 获取行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="id"></param> /// <returns></returns> T Get(object id); /// <summary> /// 获取表的所有数据 /// </summary> /// <typeparam name="T"></typeparam> /// <returns></returns> IEnumerable<T> GetAll(); /// <summary> /// 添加行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="entity"></param> /// <returns></returns> long Insert(T entity); /// <summary> /// 更新行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="entity"></param> /// <returns></returns> bool Update(T entity); /// <summary> /// 分页方法 /// </summary> /// <param name="sql"></param> /// <param name="pageIndex">当前页码</param> /// <param name="pageSize">每页显示条数</param> /// <param name="param">参数</param> /// <param name="transaction"></param> /// <param name="commandTimeout"></param> /// <returns></returns> PagedResult<T> GetPageList(string sql, int pageIndex, int pageSize, object param = null); }
接口实现：
/// <summary> /// 泛型Repository /// </summary> /// <typeparam name="T"></typeparam> public class Repository<T> : IRepository<T> where T : class, IEntity { private IUnitOfWork _unitOfWork; public Repository(IUnitOfWork unitOfWork) { _unitOfWork = unitOfWork; } /// <summary> /// 查询 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="commandType"></param> /// <returns></returns> public IEnumerable<T> Query(string sql, object param = null, CommandType? commandType = null) { var r = _unitOfWork.DbConnection.Query<T>(sql, param: param, transaction: _unitOfWork.DbTransaction, commandType: commandType); return r; } /// <summary> /// 删除行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="entityToDelete"></param> /// <returns></returns> public bool Delete(T entity) { var r = _unitOfWork.DbConnection.Delete<T>(entity, _unitOfWork.DbTransaction); return r; } /// <summary> /// 删除表所有数据 /// </summary> /// <typeparam name="T"></typeparam> /// <returns></returns> public bool DeleteAll() { var r = _unitOfWork.DbConnection.DeleteAll<T>(_unitOfWork.DbTransaction); return r; } /// <summary> /// 获取行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="id"></param> /// <returns></returns> public T Get(object id) { var r = _unitOfWork.DbConnection.Get<T>(id, _unitOfWork.DbTransaction); return r; } /// <summary> /// 获取表的所有数据 /// </summary> /// <typeparam name="T"></typeparam> /// <returns></returns> public IEnumerable<T> GetAll() { var r = _unitOfWork.DbConnection.GetAll<T>(_unitOfWork.DbTransaction); return r; } /// <summary> /// 添加行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="entity"></param> /// <returns></returns> public long Insert(T entity) { var r = _unitOfWork.DbConnection.Insert<T>(entity, _unitOfWork.DbTransaction); return r; } /// <summary> /// 更新行数据 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="entity"></param> /// <returns></returns> public bool Update(T entity) { var r = _unitOfWork.DbConnection.Update<T>(entity, _unitOfWork.DbTransaction); return r; } /// <summary> /// 分页方法 /// </summary> /// <param name="sql"></param> /// <param name="pageIndex">当前页码</param> /// <param name="pageSize">每页显示条数</param> /// <param name="param">参数</param> /// <param name="transaction"></param> /// <param name="commandTimeout"></param> /// <returns></returns> public PagedResult<T> GetPageList(string sql, int pageIndex, int pageSize, object param = null) { var pagingResult = _unitOfWork.DbConnection.GetPageList<T>(sql, pageIndex, pageSize, param: param, transaction: _unitOfWork.DbTransaction); return pagingResult; } }
GetPageList为Dapper的一个分页扩展：
/// <summary> /// 分页方法 /// </summary> /// <param name="sql"></param> /// <param name="pageIndex">当前页码</param> /// <param name="pageSize">每页显示条数</param> /// <param name="param">参数</param> /// <param name="transaction"></param> /// <param name="commandTimeout"></param> /// <returns></returns> public static PagedResult<T> GetPageList<T>(this IDbConnection connection, string sql, int pageIndex, int pageSize, object param = null, IDbTransaction transaction = null, int? commandTimeout = null) { if (pageIndex < 1) pageIndex = 1; if (pageSize < 1) pageSize = 20; var startRow = (pageIndex - 1) * pageSize; //MySql分页 sql = $"SELECT * FROM ({sql}) tt1 LIMIT {startRow},{pageSize}; SELECT COUNT(1) FROM ({sql}) tt2;"; PagedResult<T> pagingResult = new PagedResult<T>(); pagingResult.Paged.PageIndex = pageIndex; pagingResult.Paged.PageSize = pageSize; using (var result = connection.QueryMultiple(sql, param: param, transaction, commandTimeout)) { var list = result.Read<T>(); var totalCount = result.Read<long>().FirstOrDefault(); pagingResult.Data = list; pagingResult.Paged.TotalRowCount = totalCount; } return pagingResult; }
PagedResult类：
/// <summary> /// 分页模型 /// </summary> /// <typeparam name="T"></typeparam> public class PagedResult<T> { public PagedResult() { this.Paged = new Paged(); } /// <summary> /// 结果 /// </summary> public IEnumerable<T> Data { get; set; } /// <summary> /// 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 /// </summary> public Paged Paged { get; set; } }
Paged类：
/// <summary> /// 分页数据 /// </summary> public class Paged { /// <summary> /// 当前页码 /// </summary> public int PageIndex { get; set; } /// <summary> /// 页数据行数 /// </summary> public int PageSize { get; set; } /// <summary> /// 总行数 /// </summary> public long TotalRow { get; set; } /// <summary> /// 总的分页数 /// </summary> public int TotalPage { get { if (this.TotalRow > 0 && this.PageSize > 0) return (int)Math.Ceiling((decimal)this.TotalRow / this.PageSize); else return 0; } } }
在IServiceCollection容器中注册：
services.AddScoped(typeof(IRepository<>), typeof(Repository<>));