Module litebridge.db.postgres

Package org.litebridge.db.postgres

Class PostgresSequenceColumnValueGenerator

java.lang.Object

org.litebridge.db.spi.generator.SequenceColumnValueGenerator

org.litebridge.db.postgres.PostgresSequenceColumnValueGenerator

All Implemented Interfaces:

ColumnValueGenerator

public class PostgresSequenceColumnValueGenerator
extends SequenceColumnValueGenerator

Implementation of SequenceColumnValueGenerator for PostgreSQL databases.

This class generates SQL fragments to retrieve the next value from a Postgres sequence when used in SQL statements like INSERT or UPDATE.

Field Summary

Fields inherited from class org.litebridge.db.spi.generator.SequenceColumnValueGenerator

sequence

Constructor Summary

Constructors

Constructor	Description
PostgresSequenceColumnValueGenerator(String sequence)	Constructs a new PostgresSequenceColumnValueGenerator with the specified sequence name.

Method Summary

Modifier and Type	Method	Description
String	generate(ColumnMetaData columnMetaData)	Generate a SQL fragment to retrieve the next value from a sequence for direct use in an INSERT or UPDATE statement, e.g. to generate "INSERT INTO LB.ACCOUNT(ACCOUNT_ID, ACCOUNT_NAME) VALUES (nextval('sequence_name'), ?)"

Methods inherited from class java.lang.Object

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

Constructor Details

PostgresSequenceColumnValueGenerator

public PostgresSequenceColumnValueGenerator(String sequence)

Constructs a new PostgresSequenceColumnValueGenerator with the specified sequence name.

Parameters:

sequence - the name of the sequence to use

Method Details

generate

public String generate(ColumnMetaData columnMetaData)

Generate a SQL fragment to retrieve the next value from a sequence for direct use in an INSERT or UPDATE statement, e.g. to generate "INSERT INTO LB.ACCOUNT(ACCOUNT_ID, ACCOUNT_NAME) VALUES (nextval('sequence_name'), ?)", this method returns "nextval('sequence_name')".

Specified by:

generate in interface ColumnValueGenerator

Specified by:

generate in class SequenceColumnValueGenerator

Parameters:

columnMetaData - Column to generate a value for

Returns:

a formatted SQL string representing the next sequence value for direct insertion