C# Dapper 基本使用 增删改查事务等

 using DapperTest.Models;
 using System.Collections.Generic;
 using System.Web.Http;
 using Dapper;
 using System.Data;
 using System.Data.SqlClient;
 using System.Linq;
 using System.Configuration;

 namespace DapperTest.Controllers
 {
     public class HomeController : ApiController
     {
         #region 查询

         /// <summary>
         /// 查询所有数据
         /// </summary>
         /// <returns></returns>
         [HttpGet]
         public IHttpActionResult GetStudentList()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"SELECT * FROM STUDENT";
             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Query<StudentInfo>(sql).ToList();
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         /// <summary>
         /// 查询指定ID单条数据(带参数)
         /// </summary>
         /// <returns></returns>
         [HttpGet]
         public IHttpActionResult GetStudentInfo(string ID)
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"SELECT * FROM STUDENT WHERE STUID in @STUID";
             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Query<StudentInfo>(sql, new { STUID = ID });
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         /// <summary>
         /// IN查询
         /// </summary>
         /// <returns></returns>
         [HttpGet]
         public IHttpActionResult GetStudentInfos(string IDStr)
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"SELECT * FROM STUDENT WHERE STUID in @STUIDStr";
             var IDArr = IDStr.Split(',');
             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Query<StudentInfo>(sql, new { STUIDStr = IDArr });
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         /// <summary>
         /// 两表联合查询
         /// </summary>
         /// <returns></returns>
         [HttpGet]
         public IHttpActionResult GetStudentAndClass()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"SELECT * FROM STUDENT A JOIN CLASS B ON A.FK_CLASSID = B.ID";
             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Query(sql);
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         #endregion

         #region 新增

         /// <summary>
         /// 插入单条数据(带参数)
         /// </summary>
         /// <returns></returns>
         [HttpPost]
         public IHttpActionResult AddStudent()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@CLASSID)";

             StudentInfo student = new StudentInfo
             {
                 Name = "恩格斯",
                 Age = ,
                 FK_ClassID =
             };

             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Execute(sql, new { NAME = student.Name, AGE = student.Age, CLASSID = student.FK_ClassID });
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         /// <summary>
         /// 插入单条数据(直接插入整个实体)
         /// </summary>
         /// <returns></returns>
         [HttpPost]
         public IHttpActionResult AddStudentInfo()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@FK_CLASSID)";

             StudentInfo student = new StudentInfo
             {
                 Name = "马克思",
                 Age = ,
                 FK_ClassID =
             };

             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Execute(sql, student);
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         /// <summary>
         /// 插入多条数据(实体)
         /// </summary>
         /// <returns></returns>
         [HttpPost]
         public IHttpActionResult AddStudentList()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@FK_CLASSID)";

             List<StudentInfo> list = new List<StudentInfo>();
             for (int i = ; i < ; i++)
             {
                 StudentInfo student = new StudentInfo
                 {
                     Name = "强森" + i.ToString(),
                     Age = ,
                     FK_ClassID =
                 };
                 list.Add(student);
             }

             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Execute(sql, list);
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         /// <summary>
         /// 插入数据后返回自增主键
         /// </summary>
         /// <returns></returns>
         [HttpPost]
         public IHttpActionResult AddReturnID()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@CLASSID)";

             StudentInfo student = new StudentInfo
             {
                 Name = "恩格斯",
                 Age = ,
                 FK_ClassID =
             };

             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 sql += "SELECT SCOPE_IDENTITY()";
                 var result = conn.Execute(sql, new { NAME = student.Name, AGE = student.Age, CLASSID = student.FK_ClassID });
                 var id = conn.QueryFirstOrDefault<int>(sql, new { NAME = student.Name, AGE = student.Age, CLASSID = student.FK_ClassID });
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, id));
             }
         }
         #endregion

         #region 更新
         /// <summary>
         /// 使用实体更新
         /// </summary>
         /// <returns></returns>
         [HttpPost]
         public IHttpActionResult UpdateStudetInfo()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"UPDATE STUDENT SET NAME=@NAME,AGE=@AGE,FK_CLASSID=@FK_CLASSID WHERE STUID = @StuID";
             StudentInfo student = new StudentInfo
             {
                 StuID = ,
                 Name = "老夫子",
                 Age = ,
                 FK_ClassID =
             };
             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Execute(sql, student);
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }

         /// <summary>
         /// 参数更新
         /// </summary>
         /// <returns></returns>
         [HttpPost]
         public IHttpActionResult UpdateStudet(int ID)
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"UPDATE STUDENT SET NAME=@NAME,AGE=@AGE,FK_CLASSID=@FK_CLASSID WHERE STUID = @StuID";
             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Execute(sql, new {NAME = "尼古拉斯赵四",AGE = ,StuID = ID});
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }
         #endregion

         #region 删除
         public IHttpActionResult Delete(int ID)
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"DELETE STUDENT  WHERE STUID = @StuID";
             using (IDbConnection conn = new SqlConnection(conStr))
             {
                 var result = conn.Execute(sql, new { StuID = ID });
                 return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
             }
         }
         #endregion

         #region 事务
         [HttpPost]
         public IHttpActionResult AddStudentT()
         {
             string conStr = ConfigurationManager.AppSettings["SqlConnStr"];
             string sql = @"INSERT INTO STUDENT (NAME,AGE,FK_CLASSID) VALUES (@NAME,@AGE,@CLASSID)";

             StudentInfo student = new StudentInfo
             {
                 Name = "恩格斯",
                 Age = ,
                 FK_ClassID =
             };

             StudentInfo student2 = new StudentInfo
             {
                 Name = "恩格斯2",
                 Age = ,
                 FK_ClassID =
             };

             try
             {
                 using (IDbConnection conn = new SqlConnection(conStr))
                 {
                     IDbTransaction transaction = conn.BeginTransaction();
                     var result = conn.Execute(sql, student);
                     var result1 = conn.Execute(sql, student2);
                     transaction.Commit();
                     return Ok(ReturnJsonResult.GetJsonResult(RequestResult.请求成功, result));
                 }
             }
             catch (System.Exception)
             {
                 throw;
             }

         }
         #endregion
     }
 }