composite-key | 易学教程

Eclipse error on mapping with @EmbeddedId

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问题 I have an entity with composite key so I use the @Embeddable and @EmbeddedId annotations. Embeddable class looks like this : @Embeddable public class DitaAdminAccountSkillPK implements Serializable { @ManyToOne @JoinColumn(name = "admin_id") private DitaAdmin admin; @ManyToOne @JoinColumn(name = "account_id") private DitaAccount account; //constructor, getters, setters... } And the entity that uses it : @Entity public class DitaAdminAccountSkill { @EmbeddedId private DitaAdminAccountSkillPK

How to define composite key for a column family and then reference it using Hector?

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where can I find samples for this? Most of my code using ColumnFamilyTemplate to do CRUD on the data records, see below. Once I have the composite key defined, can I still use ColumnFamilyTemplate to access my data having composite keys? private static final ColumnFamilyTemplate<UUID, String> template = new ThriftColumnFamilyTemplate<UUID, String>( Bootstrap.keyspace, "User", UUIDSerializer.get(), StringSerializer.get(), HFactory.createMutator(Bootstrap.keyspace, UUIDSerializer.get())); It shouldn't matter which API you use to do the CRUD on the records; CompositeType (or DynamicCompositeType)

JPA Composite Key + Sequence

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问题 Is it possible in plain JPA or JPA+Hibernate extensions to declare a composite key, where an element of the composite key is a sequence? This is my composite class: @Embeddable public class IntegrationEJBPk implements Serializable { //... @ManyToOne(cascade = {}, fetch = FetchType.EAGER) @JoinColumn(name = "APPLICATION") public ApplicationEJB getApplication() { return application; } @Column(name = "ENTITY", unique = false, nullable = false, insertable = true, updatable = true) public String

Postgres: How to do Composite keys?

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问题 This question was migrated from Server Fault because it can be answered on Stack Overflow. Migrated 10 years ago . I cannot understand the syntax error in creating a composite key. It may be a logic error, because I have tested many varieties. How do you create composite keys in Postgres? CREATE TABLE tags ( (question_id, tag_id) NOT NULL, question_id INTEGER NOT NULL, tag_id SERIAL NOT NULL, tag1 VARCHAR(20), tag2 VARCHAR(20), tag3 VARCHAR(20), PRIMARY KEY(question_id, tag_id), CONSTRAINT no

JPA Composite Key + Sequence

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Is it possible in plain JPA or JPA+Hibernate extensions to declare a composite key, where an element of the composite key is a sequence? This is my composite class: @Embeddable public class IntegrationEJBPk implements Serializable { //... @ManyToOne(cascade = {}, fetch = FetchType.EAGER) @JoinColumn(name = "APPLICATION") public ApplicationEJB getApplication() { return application; } @Column(name = "ENTITY", unique = false, nullable = false, insertable = true, updatable = true) public String getEntity() { return entity; } @GeneratedValue(strategy = GenerationType.AUTO, generator = "INTEGRATION

Hibernate - Composite Primary Key contains Foreign Key

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问题 I have a similar question as below, but the solution didn't solve my problem. hibernate composite Primary key contains a composite foreign key, how to map this I am trying to join 2 tables, each having a composite primary key with partial foreign key reference. Table A -------- f1 (pk) f2 (pk) f3 (pk) f4 (pk) Table B -------- f1 (pk, fk) f2 (pk, fk) f5 (pk) f6 (pk) I created A, APK, B, BPK In A: private Set<B> bSet; @OneToMany(targetEntity=B.class, cascade = CascadeType.ALL, mappedBy= "bpk.a"

How can I create table as select (CTAS) in oracle?

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问题 I need to use CTAS (Create Table As Select) to create a table named Au_Books_ZL that contains au_id, fname, lname, title_id, title, Pub_id, price and revenue (which is price*sales) . I have browsed other questions online, but they don't show how to include all the attributes (lname, fname, title_id ect.) in the query. How could I write up my CTAS to create the new table? 回答1: The syntax for creating a table would be something like CREATE TABLE au_books_zl AS SELECT au_id, fname, lname, title

nHibernate Composite Key Class Type Mismatch

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问题 I have a legacy table with composite keys that are mapped to 3 other tables, since this table have other attributes in it, since it is not a simple mapping table, I can't use the many-to-many set solution to map this. The following is what I have done: <class name="classA" table="A"> <composite-id name="ID" class="AKey"> <key-many-to-one name="Id_one" class="One" column="Id_one" /> <key-many-to-one name="Id_two" class="Two" column="Id_two" /> <key-many-to-one name="Id_three" class="Three"

nHibernate Composite Key Class Type Mismatch

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I have a legacy table with composite keys that are mapped to 3 other tables, since this table have other attributes in it, since it is not a simple mapping table, I can't use the many-to-many set solution to map this. The following is what I have done: <class name="classA" table="A"> <composite-id name="ID" class="AKey"> <key-many-to-one name="Id_one" class="One" column="Id_one" /> <key-many-to-one name="Id_two" class="Two" column="Id_two" /> <key-many-to-one name="Id_three" class="Three" column="Id_three" /> </composite-id> AKey is merely a struct that holds the three ids, and Id_one, Id_two,

Database Design: Composite key vs one column primary key

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A web application I am working on has encountered an unexpected 'bug' - The database of the app has two tables (among many others) called 'States' and 'Cities'. ' States ' table fields: ------------------------------------------- idStates | State | Lat | Long ------------------------------------------- ' idStates ' is an auto-incrementing primary key. ' Cities ' table fields: ---------------------------------------------------------- idAreaCode | idStates | City | Lat | Long ---------------------------------------------------------- ' idAreaCode ' is a primary key consisting of country code +