LinqToSQL实例参见

/// <summary>

/// （增）向表中插入数据

/// </summary>

public void InsertData()

{

LinqToSQLDataContext dataContent = new LinqToSQLDataContext();

//InsertOnSubmit(TEntity entity)方法向表一次插入一条记录

employee e = new employee() { id = 4, name = "sujina", age = 22, position = "教师", partment = "狮子场小学" };

dataContent.employee.InsertOnSubmit(e);

//InsertAllOnSubmit<TSubEntity>(IEnumerable<TSubEntity> entities) 向表中一次插入多条记录

employee e1 = new employee() { id = 5, name = "sujina", age = 22, position = "教师", partment = "狮子场小学" };

employee e2 = new employee() { id = 6, name = "sujina", age = 22, position = "教师", partment = "狮子场小学" };

List<employee> epList = new List<employee>() { e1, e2 };

dataContent.employee.InsertAllOnSubmit(epList);

dataContent.SubmitChanges();//计算要插入、更新或删除的已修改对象的集，并执行相应的命令以实现对数据库的更改

}

/// <summary>

/// （删）删除数据

/// </summary>

public void deleteData()

{

LinqToSQLDataContext dataContent = new LinqToSQLDataContext();

//删除一个实体

//Single<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate)返回序列中满足指定条件的唯一元素；如果有多个这样的元素存在则会报错

employee deletes = dataContent.employee.Single(x => x.id == 4);

dataContent.employee.DeleteOnSubmit(deletes);

//删除多个实体

IEnumerable<employee> delete = dataContent.employee.Where(x => x.id == 2).Select(x => x);//兰姆达表达式

//IEnumerable<employee> delete = from s in dataContent.employee where s.id == 2 select s;//linq写法

dataContent.employee.DeleteAllOnSubmit(delete);

dataContent.SubmitChanges();

}

/// <summary>

/// （改）更新数据

/// </summary>

public void updteData()

{

LinqToSQLDataContext dataContent = new LinqToSQLDataContext();

//查出多条数据

IEnumerable<employee> update = dataContent.employee.Where(x => x.id > 4).Select(x => x);//IEnumerable<employee>类型

//IEnumerable<employee> update = from s in dataContent.employee where s.id >4 select s;//IEnumerable<employee>类型

foreach (var item in update)

{

item.name = "zybsjn";

item.partment = "酒店学校";

item.position = "教师程序员";

}

//查出单条数据

employee ep = dataContent.employee.Single(x => x.id == 5);

ep.name = "小娜娜";

dataContent.SubmitChanges();

}