[英]NHibernate.Linq LIKE
How can I produce this query using NHibernate.Linq? 如何使用NHibernate.Linq生成此查询?
WHERE this_.Name LIKE @p0; @p0 = 'test' // Notice NO % wild card
Note, this is not Linq To Sql or Entity Framework. 注意,这不是Linq To Sql或Entity Framework。 This is NHibernate. 这是NHibernate。
Edit: 编辑:
Here is the desired query using ICriteria: 以下是使用ICriteria的所需查询:
criteria.Add(Expression.Like("Name", "test"));
return criteria.List<Theater>();
Whilst this has been marked as resolved, which was correct at the time, may I also note that NHibernate has some extensions now so you can do the following: 虽然这已被标记为已解决,但当时是正确的,我可能还注意到NHibernate现在有一些扩展,所以你可以做以下事情:
Session.QueryOver<MyEntity>()
.Where(x => x.Property.IsLike("something", MatchMode.Anywhere))
.List();
This will do a LIKE '%something%'
for you. 这将为你做一个LIKE '%something%'
。
I believe this is what you are looking for: 我相信这就是你要找的东西:
var theaters = from theater in Session.Linq<Theater>()
where theater.Name.Contains("test")
select theater;
According to my tests it generates an SQL 'LIKE' statement: "... WHERE theater.Name LIKE %test%" 根据我的测试,它生成一个SQL'LIKE'语句:“... WHERE theater.Name LIKE%test%”
which is exactly the output of the criteria snippet you have provided. 这正是您提供的标准片段的输出。
I had the same problem in my project and found a solution : 我在项目中遇到了同样的问题并找到了解决方案:
session.Linq<Theater>()
.Where(x => x.Name.StartsWith("test") && x.Name.EndsWith("test");
This translates in SQL to 这在SQL中转换为
SELECT ... WHERE Name LIKE '%test' AND Name LIKE 'test%'
With NH 4 (and probably a bit earlier), a built-in Like
string extension is available within NHibernate.Linq
namespace: Like(this string matchExpression, string sqlLikePattern)
. 使用NH 4(可能稍早一点), NHibernate.Linq
命名空间中可以使用内置的Like
字符串扩展: Like(this string matchExpression, string sqlLikePattern)
。 (It is defined on NHibernate.Linq.SqlMethods
extension class.) (它在NHibernate.Linq.SqlMethods
扩展类上定义。)
using NHibernate.Linq;
...
session.Query<Theater>()
.Where(t => t.Name.Like("test"));
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