linq to sql 类的使用

本文介绍linq to sql模型类的使用

在项目中添加linq to sql类，会生成dbml文件，将你需要的表拖到此文件中即可

string str = "server=localhost;database=my_db;uid=sa;pwd=123";
DataClasses1DataContext db = new DataClasses1DataContext(str); // 创建数据库对象
var items = from item in db.Product select item; // 查询数据

string str = "server=localhost;database=my_db;uid=sa;pwd=123";
DataClasses1DataContext db = new DataClasses1DataContext(str);
Product tb = new Product(); // 创建表对象
tb.ProductName = "充电器";
tb.ProductPrice = 50;
tb.ProduceAdressID = 4;
db.Product.InsertOnSubmit(tb); // 生成sql脚本
db.SubmitChanges(); // 执行sql脚本，保存数据

string str = "server=localhost;database=my_db;uid=sa;pwd=123";
DataClasses1DataContext db = new DataClasses1DataContext(str);
var item = from s in db.Product where s.ProductID == 7 select s;
item.FirstOrDefault().ProductName = "手机充电器";
db.SubmitChanges(); // 执行sql脚本，保存数据

string str = "server=localhost;database=my_db;uid=sa;pwd=123";
DataClasses1DataContext db = new DataClasses1DataContext(str);
var item = from s in db.Product where s.ProductID == 7 select s;
db.Product.DeleteOnSubmit(item.FirstOrDefault());
db.SubmitChanges(); // 执行sql脚本，保存数据