Sequencegenerator Generates 0 As Primary Key
- Sequence Generator Generates 0 As Primary Key Function
- Sequence Generator Generates 0 As Primary Keys
- Sequence Generator Generates 0 As Primary Key Mean
Sharing a single primary key sequence across a database? Ask Question Asked 6 years. At my old job we inherited a system where they had a central sequence generator. Except that you'd get a standard implementation rather than having to roll your own centralized primary-key-generator. Obviously, using a sequence in SQL 2012 would.
TABLE Generation Strategy. The TABLE ID generation strategy relies on the existence of a database table that manages ID values. This table must have two columns. The first column, the “primary key column”, identifies the entity class for which ID values are generated.It must have the JDBC type VARCHAR.The second column, the “value column”, stores the maximum primary key values managed. Hibernate Tips is a series of posts in which I describe a quick and easy solution for common Hibernate questions. If you have a question for a future Hibernate Tip, please leave a comment below. Question: You explained that the GenerationType.SEQUENCE is the most efficient primary key generation strategy and that MySQL doesn’t support it. What shall I do if I need to support PostgreSQL.
Product key windows 10 pro generator. Defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation. A sequence 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 1.0
| 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 primary key values. |
| Optional Element Summary | |
|---|---|
int | allocationSize(Optional) The amount to increment by when allocating sequence numbers from the sequence. |
java.lang.String | catalog(Optional) The catalog of the sequence generator. |
int | initialValue(Optional) The value from which the sequence object is to start generating. |
java.lang.String | schema(Optional) The schema of the sequence generator. |
java.lang.String | sequenceName(Optional) The name of the database sequence object from which to obtain primary key values. |
| Element Detail |
|---|
name
- (Required) A unique generator name that can be referenced by one or more classes to be the generator for primary key values.
Sequence Generator Generates 0 As Primary Key Function
sequenceName
(Optional) The name of the database sequence object from which to obtain primary key values.
Defaults to a provider-chosen value.
- Default:
- '
catalog
Sequence Generator Generates 0 As Primary Keys
- (Optional) The catalog of the sequence generator.
- Since:
- Java Persistence 2.0
- Default:
- '
schema
Sequence Generator Generates 0 As Primary Key Mean
- (Optional) The schema of the sequence generator.
- Since:
- Java Persistence 2.0
- Default:
- '
initialValue
- (Optional) The value from which the sequence object is to start generating.
- Default:
- 1
allocationSize
- (Optional) The amount to increment by when allocating sequence numbers from the sequence.
- Default:
- 50
| Overview | Package | Class | Tree | Deprecated | Index | Help |
Copyright © 2009-2011, Oracle Corporation and/or its affiliates. All Rights Reserved. Use is subject to license terms.
Generated on 10-February-2011 12:41
Scripting on this page tracks web page traffic,but does not change the content in any way.