linq 数据插入 删除 更新

插入：

ProductDataContext pa = new ProductDataContext();
        PandC pd = new PandC();
           pd.CNAME="aaaa";
           pd.PID=100;
           pd.PNAME = "aaaa";
       
        pa.PandC.InsertOnSubmit(pd);
        pa.SubmitChanges();

----------或者

    ProductDataContext pa = new ProductDataContext();
     PandC pd = new PandC { CNAME = "bbb", PID = 100, PNAME = "abbbaaa" };
     pa.PandC.InsertOnSubmit(pd);
     pa.SubmitChanges();

PandC 为数据表名 也是类名 将该类实例化 传参数 再插入数据

删除：

ProductDataContext pa = new ProductDataContext();
        var deleted=from pc in pa.PandC where pc.CNAME=="bbb" select pc;
        foreach (var detial in deleted)
        {
            pa.PandC.DeleteOnSubmit(detial);
        }
        pa.SubmitChanges();

 

更新：

ProductDataContext pa = new ProductDataContext();
        var deleted = from pc in pa.PandC where pc.CNAME == "bbbss" select pc;
        foreach (var detial in deleted)
        {
            detial.CNAME = "asdasd";
        }
        pa.SubmitChanges();

或者直接执行

ProductDataContext pa = new ProductDataContext();
pa.ExecuteCommand("UPDATE PandC SET CNAME='DDDD' WHERE CNAME='aaaa'");