criteria

问题 How is this possible, I have to following criteria Criteria criteria = getSession().createCriteria(c); criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY); criteria.add(Restrictions.eq("active",true)); List list = criteria.list(); The size of list is now 20. If I add a max results to the criteria, Criteria criteria = getSession().createCriteria(c); criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY); criteria.setMaxResults(90); criteria.add(Restrictions.eq("active",true));

问题 I have a class AppUser ; class AppUser { private String firstName; private String lastName; //-- getters and setters } I also have another class Student ; class Student { private AppUser appUser; private Date dateOfBirth; //-- getters and setters } How would i search for Student John Doe , firstName John, lastName Doe? Had it been the date of birth property, i would create a Criteria and add an equality Restriction ( Restristions.eq ) on the date. How would i do it for lastName and firstName

问题 Given the following JPA annotated entity classes: @Entity @Table("foo") public class Foo { @Id private int id; @Column(name="name") private String name; @ManyToMany @JoinTable(name = "foo_tags", joinColumns = {@JoinColumn(name = "foo")}, inverseJoinColumns = {@JoinColumn(name = "tag")}) private Collection<Tag> tags; ... } @Entity @Table(name = "tag") public class Tag { @Id private String tag; ... } I'm trying to formulate a query to get all Foo instances that lack a given tag. The following

问题 I having grails criteriaQuery where I am checking OR logic againist a single state variable like this: or { eq("status", Status.ONE) eq("status", Status.TWO) eq("status", Status.THREE) } This code is working fine, My question is, as I am checking OR logic againist a single state, Is there any way to optimize this code like eq("status",Status.ONE || Status.TWO || Status.THREE) Thanks in advance. 回答1: You can use 'in'( "status", [Status.ONE, Status.TWO, Status.THREE] ) Or just 'in'( "status",

问题 I have a table in which certain words or word groups are stored. I want to select entries which start with an uppercase letter, cointain no space and contain only letters. My SQL looks like this: select word from words where w_id > 100 AND word REGEXP '^[A-Z][A-Za-z]*$' limit 2000; How do I do the same thing using criteria? 回答1: Try this: List words = session.createCriteria(Word.class) .setProjection(Projections.property("word")) .add(Restrictions.and(Restrictions.gt("w_id",100), Restrictions

问题 I am using the averageifs function, and have one column where I need to calculate the average if either of the criteria are true. I have tried using the OR function, and tried the curly brackets, but both give me errors. =AVERAGEIFS(N1:N612,I1:I612,{"FL","IF"}) There are more ranges, but the coding for those is fine. To be clear, I want to return an average if column "I" contains (specifically) the letters FL, OR the letters IF. Any other letters should mean that entry is not averaged. TIA!

问题 I am using the averageifs function, and have one column where I need to calculate the average if either of the criteria are true. I have tried using the OR function, and tried the curly brackets, but both give me errors. =AVERAGEIFS(N1:N612,I1:I612,{"FL","IF"}) There are more ranges, but the coding for those is fine. To be clear, I want to return an average if column "I" contains (specifically) the letters FL, OR the letters IF. Any other letters should mean that entry is not averaged. TIA!

问题 I want to create a query which has more than 3-4 Expression.Or ? But Expression.Or just let me to add two Expressions inside it. if (!string.IsNullOrEmpty(keyword)) query .Add(Expression.Or( Expression.Like("Name", keyword, MatchMode.Anywhere), Expression.Like("LastName", keyword, MatchMode.Anywhere))) .Add(Expression.Or( Expression.Like("Email1", keyword, MatchMode.Anywhere), Expression.Like("Email2", keyword, MatchMode.Anywhere))); The code above generates "Name like %this% or LastName like

问题 I have a datastructure like this: public class User { public Guid Id {get;set;} public string Name {get;set;} public IList<Books> Books {get;set} } I have been struggeling with making it possible to sort the users by the count of bookmarks (one-to-many relation). I have tried various approaches with both linq, criteria and queryover, but with no luck, and therefore hope one of you could help. I am using paging, since I have quite a few users, so the solution needs to do the query on the SQL

问题 I have a datastructure like this: public class User { public Guid Id {get;set;} public string Name {get;set;} public IList<Books> Books {get;set} } I have been struggeling with making it possible to sort the users by the count of bookmarks (one-to-many relation). I have tried various approaches with both linq, criteria and queryover, but with no luck, and therefore hope one of you could help. I am using paging, since I have quite a few users, so the solution needs to do the query on the SQL