C# Dapper 基本使用 增删改查事务等

  1 using DapperTest.Models;
  2 using System.Collections.Generic;
  3 using System.Web.Http;
  4 using Dapper;
  5 using System.Data;
  6 using System.Data.SqlClient;
  7 using System.Linq;
  8 using System.Configuration;
  9  
 10 namespace DapperTest.Controllers
 11 {
 12     public class HomeController : ApiController
 13     {
 14         #region 查询
 15  
 16         /// <summary>
 17         /// 查询所有数据
 18         /// </summary>
 19         /// <returns></returns>
 20         [HttpGet]
 21         public IHttpActionResult GetStudentList()
 22         {
 23             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
 24             string sql = @"SELECT * FROM STUDENT";
 25             using (IDbConnection conn = new SqlConnection(conStr))
 26             {
 27                 var result = conn.Query<StudentInfo>(sql).ToList();
 28                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
 29             }
 30         }
 31  
 32         /// <summary>
 33         /// 查询指定ID单条数据(带参数)
 34         /// </summary>
 35         /// <returns></returns>
 36         [HttpGet]
 37         public IHttpActionResult GetStudentInfo(string ID)
 38         {
 39             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
 40             string sql = @"SELECT * FROM STUDENT WHERE STUID in @STUID";
 41             using (IDbConnection conn = new SqlConnection(conStr))
 42             {
 43                 var result = conn.Query<StudentInfo>(sql, new { STUID = ID });
 44                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
 45             }
 46         }
 47  
 48         /// <summary>
 49         /// IN查询
 50         /// </summary>
 51         /// <returns></returns>
 52         [HttpGet]
 53         public IHttpActionResult GetStudentInfos(string IDStr)
 54         {
 55             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
 56             string sql = @"SELECT * FROM STUDENT WHERE STUID in @STUIDStr";
 57             var IDArr = IDStr.Split(‘,‘);
 58             using (IDbConnection conn = new SqlConnection(conStr))
 59             {
 60                 var result = conn.Query<StudentInfo>(sql, new { STUIDStr = IDArr });
 61                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
 62             }
 63         }
 64  
 65         /// <summary>
 66         /// 两表联合查询
 67         /// </summary>
 68         /// <returns></returns>
 69         [HttpGet]
 70         public IHttpActionResult GetStudentAndClass()
 71         {
 72             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
 73             string sql = @"SELECT * FROM STUDENT A JOIN CLASS B ON A.FK_CLASSID = B.ID";
 74             using (IDbConnection conn = new SqlConnection(conStr))
 75             {
 76                 var result = conn.Query(sql);
 77                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
 78             }
 79         }
 80  
 81         #endregion
 82  
 83         #region 新增
 84  
 85  
 86         /// <summary>
 87         /// 插入单条数据(带参数)
 88         /// </summary>
 89         /// <returns></returns>
 90         [HttpPost]
 91         public IHttpActionResult AddStudent()
 92         {
 93             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
 94             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@CLASSID)";
 95  
 96             StudentInfo student = new StudentInfo
 97             {
 98                 Name = "恩格斯",
 99                 Age = 55,
100                 FK_ClassID = 1
101             };
102  
103             using (IDbConnection conn = new SqlConnection(conStr))
104             {
105                 var result = conn.Execute(sql, new { NAME = student.Name, AGE = student.Age, CLASSID = student.FK_ClassID });
106                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
107             }
108         }
109  
110  
111         /// <summary>
112         /// 插入单条数据(直接插入整个实体)
113         /// </summary>
114         /// <returns></returns>
115         [HttpPost]
116         public IHttpActionResult AddStudentInfo()
117         {
118             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
119             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@FK_CLASSID)";
120  
121             StudentInfo student = new StudentInfo
122             {
123                 Name = "马克思",
124                 Age = 55,
125                 FK_ClassID = 1
126             };
127  
128             using (IDbConnection conn = new SqlConnection(conStr))
129             {
130                 var result = conn.Execute(sql, student);
131                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
132             }
133         }
134  
135         /// <summary>
136         /// 插入多条数据(实体)
137         /// </summary>
138         /// <returns></returns>
139         [HttpPost]
140         public IHttpActionResult AddStudentList()
141         {
142             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
143             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@FK_CLASSID)";
144  
145             List<StudentInfo> list = new List<StudentInfo>();
146             for (int i = 0; i < 3; i++)
147             {
148                 StudentInfo student = new StudentInfo
149                 {
150                     Name = "强森" + i.ToString(),
151                     Age = 55,
152                     FK_ClassID = 1
153                 };
154                 list.Add(student);
155             }
156  
157             using (IDbConnection conn = new SqlConnection(conStr))
158             {
159                 var result = conn.Execute(sql, list);
160                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
161             }
162         }
163  
164         /// <summary>
165         /// 插入数据后返回自增主键
166         /// </summary>
167         /// <returns></returns>
168         [HttpPost]
169         public IHttpActionResult AddReturnID()
170         {
171             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
172             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@CLASSID)";
173  
174             StudentInfo student = new StudentInfo
175             {
176                 Name = "恩格斯",
177                 Age = 55,
178                 FK_ClassID = 1
179             };
180  
181             using (IDbConnection conn = new SqlConnection(conStr))
182             {
183                 sql += "SELECT SCOPE_IDENTITY()";
184                 var result = conn.Execute(sql, new { NAME = student.Name, AGE = student.Age, CLASSID = student.FK_ClassID });
185                 var id = conn.QueryFirstOrDefault<int>(sql, new { NAME = student.Name, AGE = student.Age, CLASSID = student.FK_ClassID });
186                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, id));
187             }
188         }
189         #endregion
190  
191         #region 更新
192         /// <summary>
193         /// 使用实体更新
194         /// </summary>
195         /// <returns></returns>
196         [HttpPost]
197         public IHttpActionResult UpdateStudetInfo()
198         {
199             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
200             string sql = @"UPDATE STUDENT SET NAME=@NAME,AGE=@AGE,FK_CLASSID=@FK_CLASSID WHERE STUID = @StuID";
201             StudentInfo student = new StudentInfo
202             {
203                 StuID = 1,
204                 Name = "老夫子",
205                 Age = 59,
206                 FK_ClassID = 2
207             };
208             using (IDbConnection conn = new SqlConnection(conStr))
209             {
210                 var result = conn.Execute(sql, student);
211                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
212             }
213         }
214  
215         /// <summary>
216         /// 参数更新
217         /// </summary>
218         /// <returns></returns>
219         [HttpPost]
220         public IHttpActionResult UpdateStudet(int ID)
221         {
222             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
223             string sql = @"UPDATE STUDENT SET NAME=@NAME,AGE=@AGE,FK_CLASSID=@FK_CLASSID WHERE STUID = @StuID";
224             using (IDbConnection conn = new SqlConnection(conStr))
225             {
226                 var result = conn.Execute(sql, new {NAME = "尼古拉斯赵四",AGE = 1,StuID = ID});
227                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
228             }
229         }
230         #endregion
231  
232         #region 删除
233         public IHttpActionResult Delete(int ID)
234         {
235             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
236             string sql = @"DELETE STUDENT  WHERE STUID = @StuID";
237             using (IDbConnection conn = new SqlConnection(conStr))
238             {
239                 var result = conn.Execute(sql, new { StuID = ID });
240                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
241             }
242         }
243         #endregion
244  
245         #region 事务
246         [HttpPost]
247         public IHttpActionResult AddStudentT()
248         {
249             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
250             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@CLASSID)";
251  
252             StudentInfo student = new StudentInfo
253             {
254                 Name = "恩格斯",
255                 Age = 55,
256                 FK_ClassID = 1
257             };
258  
259             StudentInfo student2 = new StudentInfo
260             {
261                 Name = "恩格斯2",
262                 Age = 55,
263                 FK_ClassID = 1
264             };
265            
266             try
267             {
268                 using (IDbConnection conn = new SqlConnection(conStr))
269                 {
270                     IDbTransaction transaction = conn.BeginTransaction();
271                     var result = conn.Execute(sql, student);
272                     var result1 = conn.Execute(sql, student2);
273                     transaction.Commit();
274                     return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
275                 }
276             }
277             catch (System.Exception)
278             {
279                 throw;
280             }
281            
282         }
283         #endregion
284     }
285 }