ORM简单增删改查

Posted 2022-09-02 libo-2249

  1 namespace ORM
  2 
  3     class Program
  4     
  5         static void Main(string[] args)
  6         
  7             //AddPetStore();//添加
  8             UpdatePetStore(1);//修改
  9         
 10         /// <summary>
 11         /// 添加
 12         /// </summary>
 13         private static void AddPetStore()
 14         
 15             PetStore store = new PetStore()
 16             
 17                 Name = "张三",
 18                 PassWord = "123",
 19                 Balance = 1
 20             ;
 21             using (CIM_CWEntities entities = new CIM_CWEntities())
 22             
 23                 entities.PetStore.Add(store);
 24                 if (entities.SaveChanges() > 0)
 25                 
 26                     Console.WriteLine("添加-成功");
 27                 
 28             
 29         
 30         /// <summary>
 31         /// 修改
 32         /// </summary>
 33         /// <param name="storeId"></param>
 34         private static void UpdatePetStore(int storeId)
 35         
 36             using (CIM_CWEntities entities = new CIM_CWEntities())
 37             
 38                 //第一种修改
 39                 //PetStore store = entities.PetStore.FirstOrDefault(i => i.Id == storeId);//lambda表达式：用于简化委托和实例
 40                 //store.Name = "李四1";
 41                 //store.PassWord = "456";
 42 
 43                 //第二种修改
 44                 IQueryable<PetStore> store = entities.PetStore.Where(i => i.Id == storeId);//可以根据多条件修改
 45                 foreach (var item in store)
 46                 
 47                     item.Name = "王维";
 48                     item.PassWord = "456789";
 49                 
 50                 if (entities.SaveChanges() > 0)
 51                 
 52                     Console.WriteLine("修改成功....");
 53                 
 54             
 55         
 56         /// <summary>
 57         /// 批量修改成功
 58         /// </summary>
 59         /// <param name="typeId"></param>
 60         private static void EditPetStore(int typeId)
 61         
 62             using (CIM_CWEntities entities = new CIM_CWEntities())
 63             
 64                 var list = entities.PetStore.Where<PetStore>(i => i.Id == typeId).OrderByDescending(p => p.Id).ToList<PetStore>();
 65                 list[0].Name = "李四";
 66                 list[1].PassWord = "456123";
 67                 if (entities.SaveChanges() > 0)
 68                 
 69                     Console.WriteLine("批量修改成功...");
 70                 
 71             
 72         
 73         /// <summary>
 74         /// 删除
 75         /// </summary>
 76         /// <param name="storeid"></param>
 77         private static void RemovePetSotre(int storeid)
 78         
 79             using (CIM_CWEntities entities = new CIM_CWEntities())
 80             
 81                 PetStore petStore = entities.PetStore.Single<PetStore>(i => i.Id == storeid);
 82                 entities.PetStore.Remove(petStore);
 83                 if (entities.SaveChanges() > 0)
 84                 
 85                     Console.WriteLine("删除成功...");
 86                 
 87             
 88         
 89         /// <summary>
 90         /// linq查询
 91         /// </summary>
 92         private static void GetPetSotre()
 93         
 94             using (CIM_CWEntities entities = new CIM_CWEntities())
 95             
 96                 var pr = from a in entities.PetStore
 97                          join b in entities.Pet
 98                          on a.Id equals b.Store_Id
 99                          select new  a.Name, b.Love ;
100                 foreach (var item in pr)
101                 
102                     Console.WriteLine($"名称：item.Name-爱好：item.Love");
103                 
104             
105         
106         /// <summary>
107         /// 添加方法
108         /// </summary>
109         /// <param name="pet"></param>
110         private static void ExecuteNonQuery(PetStore pet)
111         
112             using (CIM_CWEntities entities = new CIM_CWEntities())
113             
114                 SqlParameter[] sqls = 
115                     new SqlParameter("@name",pet.Name),
116                     new SqlParameter ("@pwd",pet.PassWord),
117                     new SqlParameter ("@banl",pet.Balance)
118                 ;
119                 int result = entities.Database.ExecuteSqlCommand("insert into PetStore(Name,PassWord,Balance) values(@name,@pwd,@banl)", sqls);
120                 if (result > 0)
121                 
122                     Console.WriteLine("添加成功...");
123                 
124             
125         
126         private static void ExecuteScalar()
127         
128             int obj = 0;
129             using (CIM_CWEntities entities = new CIM_CWEntities())
130             
131                 obj = entities.Database.SqlQuery<int>("select count(1) from PetStore").Single();//SQL所有查询，存储过程调用
132             
133         
134         private static void ExecuteReader()
135         
136             using (CIM_CWEntities entities = new CIM_CWEntities())
137             
138                 List<PetStore> store = entities.Database.SqlQuery<PetStore>("select * from PetStore").ToList();
139             
140         
141         private static void ExecuteProc()
142         
143             using (CIM_CWEntities entities = new CIM_CWEntities())
144             
145                 SqlParameter[] sqls =
146                     
147                     new SqlParameter ("@typeId",1),
148                     new SqlParameter ("@count",System.Data.SqlDbType.Int)//输出参数int
149                 ;
150                 sqls[1].Direction = ParameterDirection.Output;
151                 List<PetStore> stores = entities.Database.SqlQuery<PetStore>("proc_GetPetStore @typeId,@count output",sqls).ToList();
152 
153                 int count =(int)sqls[1].Value;
154             
155         
156     
157 

ORM