db.ZQ_TestEF.Add(new ZQ_TestEF()
{
name = "李四",
age = 26,
sex = "M",
cardno = "15362345789",
birthday = (new DateTime(1998, 5, 12))
}
);
db.SaveChanges(); //单个增加
var ci = db.ZQ_TestEF.Where(w => w.id == 2).FirstOrDefault();// 第一种删除,官方推荐
if (ci != null)
{
db.ZQ_TestEF.Remove(ci);
}
ZQ_TestEF ef = new ZQ_TestEF()
{ //第二种删除
id = 3
};
db.ZQ_TestEF.Attach(ef);
db.ZQ_TestEF.Remove(ef);
ZQ_TestEF ef = new ZQ_TestEF()
{
id = 4
};
var entity = db.Entry<ZQ_TestEF>(ef);
entity.State = System.Data.Entity.EntityState.Deleted; // 第三种删除
var ci = db.ZQ_TestEF.Where(w => w.id == 5).FirstOrDefault();
ci.name = "王五";
ci.sex = "F";
ci.age = 35;
ci.cardno = "388483929344";
ci.birthday = DateTime.Now.AddYears(-20); //第一种修改
var ci = new ZQ_TestEF()
{
id = 5,
name = "孙六",
sex = "M",
age = 22,
cardno = "15675206745",
birthday = DateTime.Now.AddYears(-30)
};
db.Entry<ZQ_TestEF>(ci).State = System.Data.Entity.EntityState.Modified; //第二种修改
var i = db.SaveChanges();
Console.WriteLine("一共删除了{0}笔", i);
var ci = db.ZQ_TestEF.Where(w => w.id == 5).FirstOrDefault();
Console.WriteLine(ci); //查询