org.apache.torque.oid
Class AutoIncrementIdGenerator

java.lang.Object
  org.apache.torque.oid.AutoIncrementIdGenerator

All Implemented Interfaces:

IdGenerator

public class AutoIncrementIdGenerator

extends java.lang.Object

implements IdGenerator

This generator works with databases that have an sql syntax that allows the retrieval of the last id used to insert a row for a Connection.

Version:

$Id: AutoIncrementIdGenerator.java,v 1.5 2002/11/26 23:46:56 mpoeschl Exp $

Author:

John D. McNally

Field Summary

private DB

dbAdapter the adapter that knows the correct sql syntax

Constructor Summary

AutoIncrementIdGenerator(DB adapter)
Creates an IdGenerator which will work with the specified database.

Method Summary

java.math.BigDecimal	getIdAsBigDecimal(java.sql.Connection connection, java.lang.Object keyInfo) Returns the last ID used by this connection.
int	getIdAsInt(java.sql.Connection connection, java.lang.Object keyInfo) Returns the last ID used by this connection.
long	getIdAsLong(java.sql.Connection connection, java.lang.Object keyInfo) Returns the last ID used by this connection.
java.lang.String	getIdAsString(java.sql.Connection connection, java.lang.Object keyInfo) Returns the last ID used by this connection.
private com.workingdogs.village.Value	getIdAsVillageValue(java.sql.Connection connection, java.lang.Object keyInfo) Returns the last ID used by this connection.
boolean	isConnectionRequired() A flag to determine whether a Connection is required to generate an id.
boolean	isPostInsert() A flag to determine the timing of the id generation
boolean	isPriorToInsert() A flag to determine the timing of the id generation

Methods inherited from class java.lang.Object

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

Field Detail

dbAdapter

private DB dbAdapter

the adapter that knows the correct sql syntax

Constructor Detail

AutoIncrementIdGenerator

public AutoIncrementIdGenerator(DB adapter)

Creates an IdGenerator which will work with the specified database.

Parameters:

adapter - the adapter that knows the correct sql syntax.

Method Detail

getIdAsInt

public int getIdAsInt(java.sql.Connection connection,
                      java.lang.Object keyInfo)
               throws java.lang.Exception

Returns the last ID used by this connection.

Specified by:

getIdAsInt in interface IdGenerator

Parameters:

connection - A Connection.

keyInfo - an Object that contains additional info.

Returns:

An int with the value for the id.

Throws:

java.lang.Exception - Database error.

getIdAsLong

public long getIdAsLong(java.sql.Connection connection,
                        java.lang.Object keyInfo)
                 throws java.lang.Exception

Returns the last ID used by this connection.

Specified by:

getIdAsLong in interface IdGenerator

Parameters:

connection - A Connection.

keyInfo - an Object that contains additional info.

Returns:

A long with the value for the id.

Throws:

java.lang.Exception - Database error.

getIdAsBigDecimal

public java.math.BigDecimal getIdAsBigDecimal(java.sql.Connection connection,
                                              java.lang.Object keyInfo)
                                       throws java.lang.Exception

Returns the last ID used by this connection.

Specified by:

getIdAsBigDecimal in interface IdGenerator

Parameters:

connection - A Connection.

keyInfo - an Object that contains additional info.

Returns:

A BigDecimal with the last value auto-incremented as a result of an insert.

Throws:

java.lang.Exception - Database error.

getIdAsString

public java.lang.String getIdAsString(java.sql.Connection connection,
                                      java.lang.Object keyInfo)
                               throws java.lang.Exception

Returns the last ID used by this connection.

Specified by:

getIdAsString in interface IdGenerator

Parameters:

connection - A Connection.

keyInfo - an Object that contains additional info.

Returns:

A String with the last value auto-incremented as a result of an insert.

Throws:

java.lang.Exception - Database error.

isPriorToInsert

public boolean isPriorToInsert()

A flag to determine the timing of the id generation

Specified by:

isPriorToInsert in interface IdGenerator

Returns:

a boolean value

isPostInsert

public boolean isPostInsert()

A flag to determine the timing of the id generation

Specified by:

isPostInsert in interface IdGenerator

Returns:

a boolean value

isConnectionRequired

public final boolean isConnectionRequired()

A flag to determine whether a Connection is required to generate an id.

Specified by:

isConnectionRequired in interface IdGenerator

Returns:

a boolean value

getIdAsVillageValue

private com.workingdogs.village.Value getIdAsVillageValue(java.sql.Connection connection,
                                                          java.lang.Object keyInfo)
                                                   throws java.lang.Exception

Returns the last ID used by this connection.

Parameters:

connection - A Connection.

keyInfo - an Object that contains additional info.

Returns:

A Village Value with the last value auto-incremented as a result of an insert.

Throws:

java.lang.Exception - Database error.