.Net如何优雅的使用Dapper访问oracle数据库

1、引用Dapper

2、创建DapperFactory类

public class DapperFactory
    {
        public static readonly string connectionString = ConfigurationManager.AppSettings["connection_string"];
       
        public static OracleConnection CrateOracleConnection()
        {
            var connection = new OracleConnection(connectionString);
            connection.Open();
            return connection;
        }
    }

3、创建测试类以及映射关系

   public  class SysUser
    {
        public string EmpID { get; set; }
        public string ID { get; set; }
        public string UserName { get; set; }
        public string RealName { get; set; }
    }

[Serializable]
    public class SysUserMapping : ClassMapper<SysUser>
    {
        public SysUserMapping()
        {
            base.Table("SYS_USER");
            Map(p => p.ID).Column("ID").Key(KeyType.Assigned);
            Map(p => p.EmpID).Column("EMP_ID");
            Map(p => p.UserName).Column("USERNAME");
            Map(p => p.RealName).Column("REALNAME");
            // 启用自动映射，一定要调用此方法
            AutoMap();
        }
    }

4、使用Dapper访问数据库

using (var conn = DapperFactory.CrateOracleConnection())
            {
                string query = "SELECT  *  FROM sys_user t where username=:id ";
                var par = new { id = "admin" };
                var lst = conn.Query<SysUser>(query, par).ToList();

                conn.Insert(new SysUser());
                conn.Update(new SysUser());//根据主键更新
                conn.Delete(new SysUser()); //根据主键删除
            }

5、一些其他的写法

public int Insert(StudentModel model)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                                        
                string executeSql = @" INSERT INTO student VALUES(:PkId, :ClsCode, :StudentName)";
                return conn.Execute(executeSql, model);
            }
        }
        public List<StudentModel> GetAll()
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                string query = "SELECT pk_id as PkId,Cls_Code as ClsCode,Student_Name as StudentName FROM student ";
                return conn.Query<StudentModel>(query).ToList();
            }
        }
        public List<StudentModel> Get(string strName)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                string query = "SELECT pk_id as PkId,Cls_Code as ClsCode,Student_Name as StudentName FROM student WHERE Student_Name = :param";
                return conn.Query<StudentModel>(query, new { param = strName }).ToList();
            }
        }
        public List<StudentModel> GetIn(string[] strNames)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                string query = "SELECT pk_id as PkId,Cls_Code as ClsCode,Student_Name as StudentName FROM student WHERE Student_Name in :param";
                return conn.Query<StudentModel>(query, new { param = strNames }).ToList();
            }
        }

        /// <summary>
        /// 使用事务批量新增
        /// </summary>
        /// <param name="list"></param>
        /// <returns></returns>
        public int InsertByTrans(List<StudentModel> list)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                IDbTransaction transaction = conn.BeginTransaction();
                int row = 0;
                foreach (var item in list)
                {
                    string executeSql = @" INSERT INTO student VALUES(:PkId, :ClsCode, :StudentName)";
                    row += conn.Execute(executeSql, item, transaction, null, null);
                }
                transaction.Commit();
                return row;
            }
        }
        public bool Delete(int PkId)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                string executeSql = @" DELETE FROM student WHERE PkId = :PkId  ";
                var conditon = new { PkId = PkId };
                //或者下面的添加方式
                //var param = new DynamicParameters();
                //param.Add("PkId", PkId);

                return conn.Execute(executeSql, conditon) > 0 ? true : false;
            }
        }

        public int MultDelete(List<StudentModel> ulist)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                string query = "DELETE  student PkId uID=@PkId";
                return conn.Execute(query, ulist);
            }
        }

        public bool EditWUFEI_TESTTB(StudentModel student)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                string executeSql = @" UPDATE student SET USER_NAME = :USER_NAME,USER_ADDRESS = :USER_ADDRESS,USER_SEX = :USER_SEX,USER_BIRTHDAY = :USER_BIRTHDAY,USER_REMARK = :USER_REMARK   
                                    WHERE USER_ID = :USER_ID  ";
                return conn.Execute(executeSql, student) > 0 ? true : false;
            }
        }

        public bool UpdateWUFEI_TESTTB(string sqlStr)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                return conn.Execute(sqlStr) > 0 ? true : false;
            }
        }

        public StudentModel GetWUFEI_TESTTB(Decimal USER_ID)
        {
            using (var conn = DapperFactory.CrateOracleConnection())
            {
                String executeSql = @" SELECT USER_ID, USER_NAME, USER_ADDRESS, USER_SEX, USER_BIRTHDAY, USER_REMARK FROM student
                                    WHERE USER_ID = :USER_ID ";
                var conditon = new { USER_ID = USER_ID };
                return conn.Query<StudentModel>(executeSql, conditon).SingleOrDefault();
            }
        }

来源：oschina

链接：https://my.oschina.net/u/4358563/blog/4368673