C# ORM学习笔记：使用特性+反射实现简单ORM(3)

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C# ORM学习笔记：使用特性+反射实现简单ORM(3)

/// 根据实体返回主键 /// </summary> /// <param name="entity"></param> /// <returns></returns> public static string GetKey<TEntity>(TEntity entity) where TEntity : class { Type entityType = entity.GetType(); string strKey = Convert.ToString(_HashKey[entityType.FullName]); if (strKey == "") { if (entityType.GetCustomAttributes(typeof(DataTableAttribute), false)[0] is DataTableAttribute dtAttr) { strKey = dtAttr.Key; } else { throw new Exception(entityType.ToString() + "未设置DataTable特性。"); } _HashKey[entityType.FullName] = strKey; } return strKey; } } }

五、运行测试

新建一个控制台程序：

			
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using LinkTo.ORM.Model;

namespace LinkTo.ORM.Client
{
    class Program
    {
        static void Main()
        {
            //新增
            Person insertPerson = new Person
            {
                Name = "Hello",
                Age = 18,
                Gender = "male"
            };
            int insertResult = DBHelper.Insert(insertPerson);
            Console.WriteLine($"共新增了 {insertResult} 条记录。");

            //更新
            List<Person> updateList = DBHelper.Query<Person>("Name='Hello'");
            int updateResult = 0;
            if (updateList.Count > 0)
            {
                foreach (var item in updateList)
                {
                    Person updatePerson = item;
                    updatePerson.Age = 19;
                    updateResult += DBHelper.Update(updatePerson);
                }
            }
            Console.WriteLine($"共更新了 {updateResult} 条记录。");

            //查询
            List<Person> selectList = DBHelper.Query<Person>("Name='Hello'");
            if (selectList.Count > 0)
            {
                foreach (var item in selectList)
                {
                    Console.WriteLine("person.Name = " + item.Name);
                    Console.WriteLine("person.Age = " + item.Age);
                    Console.WriteLine("person.Gender = " + item.Gender);
                }
            }

            //删除
            int deleteResult = DBHelper.Delete<Person>("Name='Hello'");
            Console.WriteLine($"共删除了 {deleteResult} 条记录。");

            Console.Read();
        }
    }
}
			

运行结果如下：

源码下载