javax.persistence
Annotation Type TableGenerator


@Target(value={TYPE,METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface TableGenerator

Defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation. A table generator may be specified on the entity class or on the primary key field or property. The scope of the generator name is global to the persistence unit (across all generator types).

    Example 1:
    
    @Entity public class Employee {
        ...
        @TableGenerator(
            name="empGen", 
            table="ID_GEN", 
            pkColumnName="GEN_KEY", 
            valueColumnName="GEN_VALUE", 
            pkColumnValue="EMP_ID", 
            allocationSize=1)
        @Id
        @GeneratedValue(strategy=TABLE, generator="empGen")
        int id;
        ...
    }
    
    Example 2:
    
    @Entity public class Address {
        ...
        @TableGenerator(
            name="addressGen", 
            table="ID_GEN", 
            pkColumnName="GEN_KEY", 
            valueColumnName="GEN_VALUE", 
            pkColumnValue="ADDR_ID")
        @Id
        @GeneratedValue(strategy=TABLE, generator="addressGen")
        int id;
        ...
    }
 

Since:
Java Persistence 1.0
See Also:
GeneratedValue

Required Element Summary
 java.lang.String name
          (Required) A unique generator name that can be referenced by one or more classes to be the generator for id values.
 
Optional Element Summary
 int allocationSize
          (Optional) The amount to increment by when allocating id numbers from the generator.
 java.lang.String catalog
          (Optional) The catalog of the table.
 int initialValue
          (Optional) The initial value to be used to initialize the column that stores the last value generated.
 java.lang.String pkColumnName
          (Optional) Name of the primary key column in the table.
 java.lang.String pkColumnValue
          (Optional) The primary key value in the generator table that distinguishes this set of generated values from others that may be stored in the table.
 java.lang.String schema
          (Optional) The schema of the table.
 java.lang.String table
          (Optional) Name of table that stores the generated id values.
 UniqueConstraint[] uniqueConstraints
          (Optional) Unique constraints that are to be placed on the table.
 java.lang.String valueColumnName
          (Optional) Name of the column that stores the last value generated.
 

Element Detail

name

public abstract java.lang.String name
(Required) A unique generator name that can be referenced by one or more classes to be the generator for id values.

table

public abstract java.lang.String table
(Optional) Name of table that stores the generated id values.

Defaults to a name chosen by persistence provider.

Default:
""

catalog

public abstract java.lang.String catalog
(Optional) The catalog of the table.

Defaults to the default catalog.

Default:
""

schema

public abstract java.lang.String schema
(Optional) The schema of the table.

Defaults to the default schema for user.

Default:
""

pkColumnName

public abstract java.lang.String pkColumnName
(Optional) Name of the primary key column in the table.

Defaults to a provider-chosen name.

Default:
""

valueColumnName

public abstract java.lang.String valueColumnName
(Optional) Name of the column that stores the last value generated.

Defaults to a provider-chosen name.

Default:
""

pkColumnValue

public abstract java.lang.String pkColumnValue
(Optional) The primary key value in the generator table that distinguishes this set of generated values from others that may be stored in the table.

Defaults to a provider-chosen value to store in the primary key column of the generator table

Default:
""

initialValue

public abstract int initialValue
(Optional) The initial value to be used to initialize the column that stores the last value generated.

Default:
0

allocationSize

public abstract int allocationSize
(Optional) The amount to increment by when allocating id numbers from the generator.

Default:
50

uniqueConstraints

public abstract UniqueConstraint[] uniqueConstraints
(Optional) Unique constraints that are to be placed on the table. These are only used if table generation is in effect. These constraints apply in addition to primary key constraints.

Defaults to no additional constraints.

Default:
{}


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Generated on 10-February-2011 12:41


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