Primary Key Generator In Java

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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).

Since:Java Persistence 1.0See Also:GeneratedValueRequired Element Summary java.lang.Stringname
(Required) A unique generator name that can be referenced by one or more classes to be the generator for id values.Optional Element Summary intallocationSize
(Optional) The amount to increment by when allocating id numbers from the generator. java.lang.Stringcatalog
(Optional) The catalog of the table. intinitialValue
(Optional) The initial value to be used to initialize the column that stores the last value generated. java.lang.StringpkColumnName
(Optional) Name of the primary key column in the table. java.lang.StringpkColumnValue
(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.Stringschema
(Optional) The schema of the table. java.lang.Stringtable
(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.StringvalueColumnName
(Optional) Name of the column that stores the last value generated.Element Detail

  • To generate secrete key we can use Java KeyGenerator class which provides the functionality of a secret (symmetric) key generator. Key generators are constructed using one of the getInstance class methods of this class.
  • 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: ‘.

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

We can create a unique ID in java by using the UUID and call the method like randomUUID on UUID. String uniqueID = UUID.randomUUID.toString; This will generate the random uniqueID whose return type will be String.

Key characteristics of computer generations and names. In the following table, approximate dates against each generation has been mentioned, which are normally accepted.Following are the main five generations of computers. S.NoGeneration & Description1The period of first generation: 1946–1959.

(Optional) Name of table that stores the generated id values.

Defaults to a name chosen by persistence provider.

Default:

(Optional) The catalog of the table.

Defaults to the default catalog.

Default:

(Optional) The schema of the table.

Defaults to the default schema for user.

Default:

(Optional) Name of the primary key column in the table.

Defaults to a provider-chosen name.

Default:

(Optional) Name of the column that stores the last value generated.

Defaults to a provider-chosen name.

Default:

(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.

Swiss perfect 98 serial. Defaults to a provider-chosen value to store in the primary key column of the generator table

Default:

(Optional) The initial value to be used to initialize the column that stores the last value generated.Default:0

(Optional) The amount to increment by when allocating id numbers from the generator.Default:50

(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:{}OverviewPackageClassTreeDeprecatedIndexHelpFRAMESNO FRAMESAll Classes SUMMARY: REQUIRED | OPTIONALDETAIL: ELEMENTSubmit a bug or feature

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Generated on 10-February-2011 12:41

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