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[英]convert sql statement to linq (join two tables with where condition)
[英]convert sql to linq with two tables
select ind.desc,ind.number
from int_goals_df idd, goals_df ind
where idd.dld_number = 123456
and ind.number = idd.ind_number
and ind.categorie = 2
order by follownumber
我很难将其转换为linq,因为它使用了两个表。 我目前已经用foreach循环来解决此问题,但对此不满意。
我正在尝试获取与goals_df
列表匹配的int_goals_df
列表。
任何提示将非常感谢 ! 谢谢 !
编辑 -这是我正在使用的代码:
//get current GoalDefinitions by selected Goal
var currentGoalDefinition = MyAppAppContext.MyAppAppContextInstance.MyAppContext.GoalDefinitions.FirstOrDefault(
d => d.DLD_GoalDFID == interv.Goal.DLD_GoalenDFID);
// get current intervGoalDefinitions by GoalDefinition
var currentintervGoalDefinitions = MyAppAppContext.MyAppAppContextInstance.MyAppContext.intervGoalDefinitions.Where(
idd => idd.DLD_GoalDFID == currentGoalDefinition.DLD_GoalDFID).OrderBy(idd => idd.IDD_VolgNummer);
intervDefinitionCollection = new ObservableCollection<intervDefinition>(MyAppAppContext.MyAppAppContextInstance.MyAppContext.intervDefinitions.Where(i => i.IND_Categorie == intCategorie));
// filter intervGoalDefinitions by intervDefinitions
var intervDefinitionCollectionTemp = new ObservableCollection<intervDefinition>();
foreach (var currentintervGoalDefinity in currentintervGoalDefinitions)
{
var foundintervGoalDefinitySorted = intervDefinitionCollection.FirstOrDefault(
i => i.IND_intervDFID == currentintervGoalDefinity.IND_intervDFID);
if (foundintervGoalDefinitySorted != null)
intervDefinitionCollectionTemp.Add(foundintervGoalDefinitySorted);
}
intervDefinitionCollection = intervDefinitionCollectionTemp;
假设NHibernate为ORM,而int_goal是目标的子类
var results = from idd in session.Query<IntGoals>()
where idd.DlDNumber = 123456 && idd.Category.Id == 2
orderby idd.FollowNumber
select new { idd.Description, idd.Number };
context.int_goals_df.Join(context.goals_df, x => x.ind_number, x => x.number,
(x, y) => new
{
idd = x,
ind = y
})
.Where(x => x.idd.dld_number = 123456 && x.ind.categorie = 2)
.OrderBy(x => x.idd.follownumber)
.Select(x => new
{
x.ind.desc,
x.ind.number
});
快速开始-认为您需要加入
var results = from idd in session.Query<int_goals_df>()
join ind in session.Query<goals_df>()
on idd.ind_number equals ind.ind_number
where idd.DlDNumber = 123456 && idd.Category.Id == 2
orderby idd.FollowNumber
select new { idd.Description, idd.Number };
我倾向于使用不带隐式联接的sql语法
/*Fields*/
SELECT ind.desc, ind.number
/*Tables*/
FROM int_goals_df idd
INNER JOIN goals_df ind
ON ind.number = idd.ind_number
/*Conditions*/
WHERE idd.dld_number = 123456
AND ind.categorie = 2
/*Order/Grouping*/
ORDER BY follownumber
您可以从克里斯的答案中看到,这更容易转换为linq。
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