Re0:在 .NetCore中 EF的基本使用

整理一下目前在用的EFCore

記得好像是由於懶得寫sql，因而開始試着用EF

 

先根據數據庫生成一個好東西，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

 

沒有sql語句美滋滋

 1         #region 添加
 2         /// <summary>
 3         /// Add
 4         /// </summary>
 5         /// <param name="obj"></param>
 6         /// <returns></returns>
 7         [HttpPost("Add")]
 8         public IActionResult Add([FromBody] T obj)
 9         {
10             try
11             {
12                 _context.T.Add(obj);
13                 var result = _context.SaveChanges().ToString();
14 
15                 responseData.Status = 200;
16                 responseData.Data = result;
17                 responseData.Message = "Success";
18             }
19             catch (Exception ex)
20             {
21                 responseData.Status = 500;
22                 responseData.Message = ex.Message;
23                 return new JsonResult(responseData);
24             }
25            
26             return new JsonResult(responseData);
27         }
28         #endregion

 

一時不用一時爽

 1         #region 刪除
 2         //刪除
 3         [HttpDelete("Delete")]
 4         public IActionResult Delete([FromBody] T obj)
 5         {
 6             try
 7             {
 8                 var Test = new T { Id = obj.Id };
 9                 _context.T.Remove(Test);
10                 var result = _context.SaveChanges().ToString();
11 
12                 responseData.Status = 200;
13                 responseData.Data = result;
14                 responseData.Message = "Success";
15             }
16             catch (Exception ex)
17             {
18                 responseData.Status = 500;
19                 responseData.Message = ex.Message;
20                 return new JsonResult(responseData);
21             }
22            
23             return new JsonResult(responseData);
24         }
25         #endregion        

 

一直不用一直爽

 1         #region 修改
 2         //修改
 3         [HttpPut("Modify")]
 4         public IActionResult Modify([FromBody] T obj)
 5         {
 6             try
 7             {
 8                 int result = -1;
 9                 T t = _context.T.SingleOrDefault(u => u.Id == obj.Id);
10 
11                 if (t != null)
12                 {
13                     t = obj;
14 
15                     result = _context.SaveChanges();
16                 }
17 
18                 responseData.Status = 200;
19                 responseData.Data = result;
20                 responseData.Message = "Success";
21             }
22             catch (Exception ex)
23             {
24                 responseData.Status = 500;
25                 responseData.Message = ex.Message;
26                 return new JsonResult(responseData);
27             }
28            
29             return new JsonResult(responseData);
30         }
31         #endregion    

 

那麼問題來了，想sql了怎麼辦？

能用Sql，可是不推薦；緣由有機會了再補充

 1         #region EFSql
 2         //Select
 3         [HttpGet("Query")]
 4         public IActionResult Query()
 5         {
 6             try
 7             {
 8                 string sql = "select * from bula bula bula";
 9 
10                 var result = _context.Set<Model>().FromSql(sql).ToList();
11 
12                 if (result.Count() == 0)
13                 {
14                     responseData.Status = 201;
15                     responseData.Message = "數據爲空";
16 
17                     return new JsonResult(responseData);
18                 }
19 
20                 responseData.Status = 200;
21                 responseData.Data = result;
22                 responseData.Message = "Success";
23             }
24             catch (Exception ex)
25             {
26                 responseData.Status = 500;
27                 responseData.Message = ex.Message;
28                 return new JsonResult(responseData);
29             }
30             return new JsonResult(responseData);
31         }
32         #endregion