Hibernate Primary Key No Generator

I am trying to create a Privilege class with Annotations whose Primary Key is a String. I will assign them manually while inserting. Therefore no need for hibernate to generate a value for it. I'm trying to do something like that: @Id @GeneratedValue(generator = 'assigned') @Column(name = 'ROLENAME', nullable = false) private String roleName. Aug 08, 2017  A simple primary key field or one of the composite primary key field should be one of the following types: Any Java primitive type. Any Any primitive wrapper type. I have a table which has no primary key. How to create the hibernate mapping xml without using the generator id Hibernate Mapping problem because no primary key in database (Object Relational Mapping forum at Coderanch). The following model of the relationship between Employer and Employee uses an actual entity class (Employment) to represent the association.This is done because there might be more than one period of employment for the same two parties.

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An Object/relational mappings are usually defined in an XML document. This mapping file instructs Hibernate — how to map the defined class or classes to the database tables?

Though many Hibernate users choose to write the XML by hand, but a number of tools exist to generate the mapping document. These include XDoclet, Middlegen and AndroMDA for the advanced Hibernate users.

Let us consider our previously defined POJO class whose objects will persist in the table defined in next section.

There would be one table corresponding to each object you are willing to provide persistence. Consider above objects need to be stored and retrieved into the following RDBMS table −

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Based on the two above entities, we can define following mapping file, which instructs Hibernate how to map the defined class or classes to the database tables.

You should save the mapping document in a file with the format <classname>.hbm.xml. We saved our mapping document in the file Employee.hbm.xml.

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Let us see understand a little detail about the mapping elements used in the mapping file −

Primary Key Adalah

  • The mapping document is an XML document having <hibernate-mapping> as the root element, which contains all the <class> elements.

  • The <class> elements are used to define specific mappings from a Java classes to the database tables. The Java class name is specified using the name attribute of the class element and the database table name is specified using the table attribute.

  • The <meta> element is optional element and can be used to create the class description.

  • The <id> element maps the unique ID attribute in class to the primary key of the database table. The name attribute of the id element refers to the property in the class and the column attribute refers to the column in the database table. The type attribute holds the hibernate mapping type, this mapping types will convert from Java to SQL data type.

  • The <generator> element within the id element is used to generate the primary key values automatically. The class attribute of the generator element is set to native to let hibernate pick up either identity, sequence, or hilo algorithm to create primary key depending upon the capabilities of the underlying database.

  • The <property> element is used to map a Java class property to a column in the database table. The name attribute of the element refers to the property in the class and the column attribute refers to the column in the database table. The type attribute holds the hibernate mapping type, this mapping types will convert from Java to SQL data type.

There are other attributes and elements available, which will be used in a mapping document and I would try to cover as many as possible while discussing other Hibernate related topics.