Hibernate ORM 5. 2. Final User Guide. The Hibernate Query Language (HQL) and Java Persistence Query Language (JPQL) are both object model focused query languages similar in nature to SQL. JPQL is a heavily- inspired- by subset of HQL.
A JPQL query is always a valid HQL query, the reverse is not true however. Both HQL and JPQL are non- type- safe ways to perform query operations. Criteria queries offer a type- safe approach to querying. See Criteria for more information.
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Query API1. 5. 2. Examples domain model. To better understand the further HQL and JPQL examples, it’s time to familiarize the domain model entities that are used in all the examples features in this chapter.
Example 4. 53. Examples domain model@Named. Queries({. @Named. Query(. name = "get_person_by_name".
Person p where name = : name". Named. Query(. name = "get_read_only_person_by_name". Person p where name = : name".
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Query. Hint(. name = "org. Only". value = "true". Named. Stored. Procedure. Queries(. @Named. Stored. Procedure.
Query(. name = "sp_person_phones". Name = "sp_person_phones". Stored. Procedure. Parameter(. name = "person. Id". type = Long. Parameter. Mode. IN.
Stored. Procedure. Parameter(. name = "person. Phones". type = Class. Parameter. Mode. REF_CURSOR. Person {. @Generated. Value. private Long id.
String name. private String nick. Name. private String address.
Temporal(Temporal. Type. TIMESTAMP ). Date created. On. One. To. Many(mapped.
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Hibernate not only takes care of the mapping from Java classes to database tables (and from Java data types to SQL data types), but also provides data query and. Hibernate Core. Java Persistence and EJB 3.0. Hibernate APIs support query execution with listing, iteration, and scrolling. Java Persistence standardizes query. IntelliJ IDEA 2017.2 is a new massive update for the IDE. The update brings even smarter coding assistance, neater UI, faster performance, and tons of other improvements.
By = "person", cascade = Cascade. Type. ALL). @Order. Column(name = "order_id"). List< Phone> phones = new Array. List< > ().
Element. Collection. Map. Key. Enumerated(Enum. Type. STRING). private Map< Address. Type, String> addresses = new Hash. Map< > (). private int version. Getters and setters are omitted for brevity.
Address. Type {. public class Partner {. Generated. Value. Long id. private String name. Getters and setters are omitted for brevity.
Phone {. private Long id. Many. To. One(fetch = Fetch. Type. LAZY). private Person person. Column(name = "phone_number").
String number. @Enumerated(Enum.Type. STRING). @Column(name = "phone_type"). Photoshop Brushes Pack 02 Of 23 Full Version . Phone. Type type.
One. To. Many(mapped. By = "phone", cascade = Cascade. Type. ALL, orphan. Removal = true). private List< Call> calls = new Array. List< > ( ). One. To. Many(mapped.
By = "phone"). @Map. Key(name = "timestamp"). Map. Key. Temporal(Temporal. Type. TIMESTAMP ). Map< Date, Call> call.
History = new Hash. Map< > (). @Element. Collection. private List< Date> repair. Timestamps = new Array. List< > ( ). Getters and setters are omitted for brevity.
Phone. Type {. @Table(name = "phone_call"). Call {. @Generated. Value. private Long id.
Phone phone. @Column(name = "call_timestamp"). Date timestamp. private int duration.
Getters and setters are omitted for brevity. Inheritance(strategy = Inheritance. Type. JOINED). public class Payment {. Generated. Value. Long id. private Big. Decimal amount. private boolean completed.
Person person. //Getters and setters are omitted for brevity. Credit. Card. Payment extends Payment {. Wire. Transfer. Payment extends Payment {. JPA Query APIIn JPA the query is represented by javax. Query or javax. persistence.
Typed. Query as obtained from the Entity. Manager. The create an inline Query or Typed. Query, you need to use the Entity. Manager#create. Query method.
For named queries, the Entity. Manager#create. Named. Query method is needed.
Example 4. 54. Obtaining a JPA Query or a Typed. Query reference. Query query = entity.
Manager. create. Query(. Person p " +. "where p. Typed. Query< Person> typed. Query = entity. Manager.
Query(. "select p " +. Person p " +. "where p. Person. class. ); Example 4.
Obtaining a JPA Query or a Typed. Query reference for a named query@Named. Query(. name = "get_person_by_name".
Person p where name = : name". Query query = entity. Manager. create. Named. Query( "get_person_by_name" ). Typed. Query< Person> typed. Query = entity. Manager. Named. Query(. "get_person_by_name", Person.
Hibernate offers a specific. Named. Query annotation.
Example 4. 56. Obtaining a Hibernate Query or a Typed. Query reference for a named query@Named. Queries({. @Named. Query(. name = "get_phone_by_number". Phone p " +. "where p.
Only = true. Phone phone = entity. Manager. . create. Named. Query( "get_phone_by_number", Phone. Parameter( "number", "1. Single. Result(); The Query interface can then be used to control the execution of the query. For example, we may want to specify an execution timeout or control caching.
Example 4. 57. Basic JPA Query usage. Query query = entity. Manager. create. Query(. Person p " +. "where p. Hint( "javax. persistence. Flush. Mode( Flush. Mode. Type. COMMIT ); For complete details, see the Query.
Javadocs. Many of the settings controlling the execution of the query are defined as hints. JPA defines some standard hints (like timeout in the example), but most are provider specific. Relying on provider specific hints limits your applications portability to some degree.
Defines the query timeout, in milliseconds. Defines a fetchgraph Entity. Graph. Attributes explicitly specified as Attribute. Nodes are treated as Fetch.
Type. EAGER (via join fetch or subsequent select). For details, see the Entity. Graph discussions in Fetching. Defines a loadgraph Entity. Graph. Attributes explicitly specified as Attribute.
Nodes are treated as Fetch. Type. EAGER (via join fetch or subsequent select). Attributes that are not specified are treated as Fetch. Type. LAZY or Fetch.
Type. EAGER depending on the attribute’s definition in metadata. For details, see the Entity.
Graph discussions in Fetching. Mode. Defines the Cache. Mode to use. See org. Query#set. Cache. Mode. org. hibernate.
Defines whether the query is cacheable. See org. hibernate. Query#set. Cacheable.
Region. For queries that are cacheable, defines a specific cache region to use.See org. hibernate. Call Of Duty Modern Warfare 2 Local Multiplayer Cracked . Query#set. Cache.Region. org. hibernate.Defines the comment to apply to the generated SQL.See org. hibernate.Query#set. Comment.
Size. Defines the JDBC fetch- size to use. See org. hibernate. Query#set. Fetch. Sizeorg. hibernate. Mode. Defines the Hibernate- specific Flush. Mode to use. See org.
Query#set. Flush. Mode. If possible, prefer using javax. Query#set. Flush.
Mode instead. org. Only. Defines that entities and collections loaded by this query should be marked as read- only. See org. hibernate. Query#set. Read. Only. The final thing that needs to happen before the query can be executed is to bind the values for any defined parameters. JPA defines a simplified set of parameter binding methods. Essentially it supports setting the parameter value (by name/position) and a specialized form for Calendar/Date types additionally accepting a Temporal.
Type. Example 4. 58. JPA name parameter binding. Query query = entity. Manager. create. Query(. Person p " +. "where p. Parameter( "name", "J%" ).
For generic temporal field types (e. Date`, `java. util. Calendar`). // we also need to provide the associated `Temporal. Type`. Query query = entity.
Manager. create. Query(. Person p " +. "where p. On > : timestamp" ). Parameter( "timestamp", timestamp, Temporal. Type. DATE ); JPQL- style positional parameters are declared using a question mark followed by an ordinal - ? The ordinals start with 1. Just like with named parameters, positional parameters can also appear multiple times in a query.
Example 4. 59. JPA positional parameter binding. Query query = entity.
Manager. create. Query(. Person p " +. "where p. Parameter( 1, "J%" ); It’s good practice not to mix forms in a given query. In terms of execution, JPA Query offers 2 different methods for retrieving a result set. Query#get. Result. List() - executes the select query and returns back the list of results. Query#get. Single.
Result() - executes the select query and returns a single result. If there were more than one result an exception is thrown. Example 4. 60. JPA get. Result. List() result. List< Person> persons = entity. Manager. create. Query(.
Person p " +. "where p. Parameter( "name", "J%" ).
Result. List(); Example 4. JPA get. Single. Result()Person person = (Person) entity. Manager. create. Query(. Person p " +. "where p. Parameter( "name", "J%" ).
Single. Result(); 1. Hibernate Query APIIn Hibernate, the HQL query is represented as org. Query which is obtained from a Session.
If the HQL is a named query, Session#get. Named. Query would be used; otherwise Session#create. Query is needed. Example 4. Obtaining a Hibernate Queryorg. Query query = session. Query(. "select p " +. Person p " +. "where p.
What’s New in Intelli. J IDEAControl flow analysis. Control flow analysis has become much smarter and now detects a wider variety of problems in the code. For example, if Collection#is. Empty() returns true, the IDE understands that there are no elements in that collection to iterate over. The IDE also understands that String#char. At(int index) throws an exception when called with an empty string, or when the index exceeds the value returned by the String#length() method.
The same intelligence applies to: String#is. Empty(), String#char.
At(int index), List#get(int index), Set#contains(Object item), Map#contains. Key(Object key), Map#contains.
Value(Object value), and many other methods. The IDE also gains a better understanding of reporting nullability issues, in particular when it comes to working with Collection and Map type parameters.