Package io.github.blyznytsiaorg.bibernate.dao.jdbc.identity

Class SequenceIdGenerator

java.lang.Object

io.github.blyznytsiaorg.bibernate.dao.jdbc.identity.AbstractGenerator

io.github.blyznytsiaorg.bibernate.dao.jdbc.identity.SequenceIdGenerator

All Implemented Interfaces:

Generator

public class SequenceIdGenerator
extends AbstractGenerator
implements Generator

Implementation of the sequence-based ID generator in Bibernate.

This generator is responsible for handling entities with sequence-based generation of primary key values. This SequenceIdGenerator generator anticipates that the identifier will be generated in additional query to database before an INSERT operation into the table.

Since:

1.0

Author:

Blyzhnytsia Team

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	SELECT_NEXT_QUERY
private final Map<Class<?>,SequenceConf>	sequences

Constructor Summary

Constructors

Constructor	Description
SequenceIdGenerator(BibernateDatabaseSettings bibernateDatabaseSettings, List<String> executedQueries)	Constructs an SequenceIdGenerator with the specified Bibernate database settings and a list to store executed queries.

Method Summary

Modifier and Type	Method	Description
private Object	generateId(Class<?> entityClass, String tableName, DataSource dataSource)
private Long	getNextIdFromDbSeq(DataSource dataSource, String sequenceName)
private SequenceConf	getSequenceConf(Class<?> entityClass, String tableName)
<T> void	handle(Class<T> entityClass, Collection<T> entities, DataSource dataSource)	Handles the generation of sequence-based primary keys for a collection of entities and inserts the entities into the database using batch processing.
GenerationType	type()	Returns SEQUENCE GenerationType for further understanding of what type of generator we are dealing with

Methods inherited from class io.github.blyznytsiaorg.bibernate.dao.jdbc.identity.AbstractGenerator

addToExecutedQueries, addUpdatedEntity, getBatchSize, getGeneratedValue, insertManyToManyJoinTable, populatePreparedStatement, populatePreparedStatement, populatePreparedStatement, showSql

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SELECT_NEXT_QUERY

private static final String SELECT_NEXT_QUERY

See Also:

• Constant Field Values

sequences

private final Map<Class<?>,SequenceConf> sequences

Constructor Details

SequenceIdGenerator

public SequenceIdGenerator(BibernateDatabaseSettings bibernateDatabaseSettings,
 List<String> executedQueries)

Constructs an SequenceIdGenerator with the specified Bibernate database settings and a list to store executed queries.

Parameters:

bibernateDatabaseSettings - The database settings for Bibernate.

executedQueries - The list to store executed queries.

Method Details

type

public GenerationType type()

Returns SEQUENCE GenerationType for further understanding of what type of generator we are dealing with

Specified by:

type in interface Generator

Returns:

the generation type

handle

public <T> void handle(Class<T> entityClass,
 Collection<T> entities,
 DataSource dataSource)

Handles the generation of sequence-based primary keys for a collection of entities and inserts the entities into the database using batch processing. Gets generated id from the sequence of database and sets it to the entity. If the method will be performed in transaction then id will be cleaned up from the entity in case of rollback. Can overbook set of sequences (depends on allocation size property) and use it to avoid redundant sql queries to database

Specified by:

handle in interface Generator

Type Parameters:

T - The type of entities in the collection.

Parameters:

entityClass - The class of the entities being handled.

entities - The collection of entities for which primary keys are generated.

dataSource - The data source for obtaining a database connection.

generateId

private Object generateId(Class<?> entityClass,
 String tableName,
 DataSource dataSource)

getNextIdFromDbSeq

private Long getNextIdFromDbSeq(DataSource dataSource,
 String sequenceName)

getSequenceConf

private SequenceConf getSequenceConf(Class<?> entityClass,
 String tableName)