Re0:在 .NetCore中 EF的基本使用

整理一下目前在用的EFCore

记得好像是因为懒得写sql，于是开始试着用EF

先根据数据库生成一个好东西，嗯

Scaffold-DbContext "Data Source=localhost;Initial Catalog=dbname;Persist Security Info=True;User ID=admin;Password=admin;Pooling=true;Max Pool Size=512; Min Pool Size=5;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models

没有sql语句美滋滋

         #region 添加
         /// <summary>
         /// Add
         /// </summary>
         /// <param name="obj"></param>
         /// <returns></returns>
         [HttpPost("Add")]
         public IActionResult Add([FromBody] T obj)
         {
             try
             {
                 _context.T.Add(obj);
                 var result = _context.SaveChanges().ToString();

                 responseData.Status = ;
                 responseData.Data = result;
                 responseData.Message = "Success";
             }
             catch (Exception ex)
             {
                 responseData.Status = ;
                 responseData.Message = ex.Message;
                 return new JsonResult(responseData);
             }

             return new JsonResult(responseData);
         }
         #endregion

一时不用一时爽

         #region 删除
         //删除
         [HttpDelete("Delete")]
         public IActionResult Delete([FromBody] T obj)
         {
             try
             {
                 var Test = new T { Id = obj.Id };
                 _context.T.Remove(Test);
                 var result = _context.SaveChanges().ToString();

                 responseData.Status = ;
                 responseData.Data = result;
                 responseData.Message = "Success";
             }
             catch (Exception ex)
             {
                 responseData.Status = ;
                 responseData.Message = ex.Message;
                 return new JsonResult(responseData);
             }

             return new JsonResult(responseData);
         }
         #endregion        

一直不用一直爽

         #region 修改
         //修改
         [HttpPut("Modify")]
         public IActionResult Modify([FromBody] T obj)
         {
             try
             {
                 int result = -;
                 T t = _context.T.SingleOrDefault(u => u.Id == obj.Id);

                 if (t != null)
                 {
                     t = obj;

                     result = _context.SaveChanges();
                 }

                 responseData.Status = ;
                 responseData.Data = result;
                 responseData.Message = "Success";
             }
             catch (Exception ex)
             {
                 responseData.Status = ;
                 responseData.Message = ex.Message;
                 return new JsonResult(responseData);
             }

             return new JsonResult(responseData);
         }
         #endregion    

那么问题来了，想sql了怎么办？

能用Sql，但是不推荐；原因有机会了再补充

         #region EFSql
         //Select
         [HttpGet("Query")]
         public IActionResult Query()
         {
             try
             {
                 string sql = "select * from bula bula bula";

                 var result = _context.Set<Model>().FromSql(sql).ToList();

                 if (result.Count() == )
                 {
                     responseData.Status = ;
                     responseData.Message = "数据为空";

                     return new JsonResult(responseData);
                 }

                 responseData.Status = ;
                 responseData.Data = result;
                 responseData.Message = "Success";
             }
             catch (Exception ex)
             {
                 responseData.Status = ;
                 responseData.Message = ex.Message;
                 return new JsonResult(responseData);
             }
             return new JsonResult(responseData);
         }
         #endregion