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C linq to sql

var q = from c in db.Customers where c.City == "London" select c 等价于SQL语句 select * from db.Customers c where c.City = "London" 然后把记录集赋给变量q foreach (var v in q) 表示记录集q里的每一条记录v要执行下马{}里的操作

var c = db.Table.OrderByDescending(q=>q.ID).Take(10);

query = from c in tbs where c.sx != "类别" && c.path_tbname.Contains(tName.Text) orderby c.id select c; Contains 就等于 like '%'+tName.Text+'%'

DataList.DataSource=menuShow.Navigations.Select(c => new { c.CustomerID, c.Orders });

linq语句是 from p in username where p.IndexOf("王") == 0 select p; 这里的username代表查询对象,p是随意的,它可以是任何字符(p in username 表示p是username的元素)。 p.IndexOf("王") == 0 查询不以”王“开头的数据。

LINQ 按多个字段排序(orderby、thenby、Take) orderby 子句解析为 OrderBy()方法,orderby descending 子句解析为OrderBy Descending()方法: var racers = Formula1.GetChampions(). Where(r = > r.Country == "Brazil"). OrderByDescending(...

from A in DFZFORMT055 join B in FM_CODE_LIST on A.MoneyType = B.ITEM_VALUE AND B.FORM_KIND = 'DFZ.FORM.T055' AND B.FIELD_NAME= 'MoneyType' join C in JOIN FM_CODE_LIST on A.PayMentType = C.ITEM_VALUE AND C.FORM_KIND = 'DFZ.FORM....

先为table1表的字段1a创建序列s_1a,然后insert into table1(1a,1b,1c) values(); for v_row in (Select t1.2b,t1.2c from table2 t1,table3 t2 where t1.2a=t2.3a and 3b>10) loop insert into table1(1a,1b,1c) values(s_1a.nextval,v_row.2b,v...

edit和userToBeEdi不是一个一样的内部结构的表对象。因此不能直接赋值。

query = from c in tbs where c.sx != "类别" && c.path_tbname.Contains(tName.Text) orderby c.id select c; Contains 等于 like '%'+tName.Text+'%'

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