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  • 使用EF进行简单的增删改查

    CREATE TABLE `objinfo` (
    `Id` int(11) NOT NULL,
    `ObjName` varchar(255) DEFAULT NULL,
    `ObjType` int(255) DEFAULT NULL,
    `ObjPrice` decimal(10,0) DEFAULT NULL,
    `ObjSellPrice` decimal(10,0) DEFAULT NULL,
    `ObjIcon` varchar(255) DEFAULT NULL,
    `AddAttack` int(255) DEFAULT NULL,
    `AddDefence` int(255) DEFAULT NULL,
    `AddTili` int(255) DEFAULT NULL,
    `AddExp` int(255) DEFAULT NULL,
    PRIMARY KEY (`Id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
    

      

      private static void Add()
            {
                arpgdbEntities dbContext = new arpgdbEntities();
                objinfo obj = new objinfo
                {
                    AddDefence = 1,
                    AddAttack = 2,
                    AddExp = 3,
                    AddTili = 4,
                    Id = 6,
                    ObjIcon = "",
                    ObjName = "青铜戒指",
                    ObjPrice = 10,
                    ObjSellPrice = 5,
                    ObjType = 1
                };
                dbContext.objinfo.Add(obj);
                int result = dbContext.SaveChanges();
                if (result > 0)
                {
                    Console.WriteLine("保存成功");
                }
            }
    
            // 删除现在出了问题
            private static void Del()
            {
                arpgdbEntities dbContext = new arpgdbEntities();
                // 先查出来
                var objs = from c in dbContext.objinfo
                           where c.Id == 3
                           select c;
                dbContext.Entry(objs.ToList().FirstOrDefault()).State = EntityState.Deleted;
                if (dbContext.SaveChanges() > 0)
                {
                    Console.WriteLine("删除成功");
                }
            }
    
            private static void Modify()
            {
                arpgdbEntities dbContext = new arpgdbEntities();
                // 先查出来一个
                var objs = from c in dbContext.objinfo
                           where c.Id == 1
                           select c;
                objinfo obj = objs.ToList().FirstOrDefault();
                obj.ObjName = "强化戒指";  // 如果在这儿修改了主键怎么办,如果数据库中没有设置主键怎么办
                obj.ObjIcon = "addd";
                dbContext.Entry(obj).State = EntityState.Modified;
                int result = dbContext.SaveChanges();
                if (result > 0)
                {
                    Console.WriteLine("修改成功");
                }
    
            }
    
            private static void Select()
            {
                arpgdbEntities dbContext = new arpgdbEntities();
                var objs = from c in dbContext.objinfo
                           select c;
                foreach (objinfo objinfo in objs.ToList())
                {
                    Console.WriteLine(objinfo.Id);
                }
            }
    

      

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  • 原文地址:https://www.cnblogs.com/FangZhaohu/p/5275273.html
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