org.apache.openjpa.jdbc.kernel
Class TableJDBCSeq

java.lang.Object
  org.apache.openjpa.jdbc.kernel.AbstractJDBCSeq
      org.apache.openjpa.jdbc.kernel.TableJDBCSeq

All Implemented Interfaces:

JDBCSeq, Seq, Configurable, Closeable

Direct Known Subclasses:

ClassTableJDBCSeq, ValueTableJDBCSeq

public class TableJDBCSeq
extends AbstractJDBCSeq
implements Configurable

JDBCSeq implementation that uses a database table for sequence number generation. This base implementation uses a single row for a global sequence number.

Author:

Abe White

Nested Class Summary

protected static class

TableJDBCSeq.Status Helper struct to hold status information.

Field Summary

static String	ACTION_ADD
static String	ACTION_DROP
static String	ACTION_GET
static String	ACTION_SET

Fields inherited from class org.apache.openjpa.jdbc.kernel.AbstractJDBCSeq

current, type

Fields inherited from interface org.apache.openjpa.kernel.Seq

TYPE_CONTIGUOUS, TYPE_DEFAULT, TYPE_NONTRANSACTIONAL, TYPE_TRANSACTIONAL

Constructor Summary

TableJDBCSeq()

Method Summary

protected Column	addPrimaryKeyColumn(Table table) Add the primary key column to the given table and return it.
void	addSchema(ClassMapping mapping, SchemaGroup group) No-op.
protected void	allocateInternal(int count, JDBCStore store, ClassMapping mapping) Allocate additional sequence values.
protected Object	currentInternal(JDBCStore store, ClassMapping mapping) Return the current sequence object.
void	dropTable() Drops the sequence table in the DB.
void	endConfiguration() Invoked upon completion of bean property configuration for this object.
int	getAllocate() Return the number of sequences to allocate for each update of the sequence table.
JDBCConfiguration	getConfiguration()
protected Object	getPrimaryKey(ClassMapping mapping) Return the primary key value for the given class.
String	getPrimaryKeyColumn() The name of the table's primary key column.
protected long	getSequence(ClassMapping mapping, Connection conn) Return the current sequence value, or -1 if unattainable.
String	getSequenceColumn() The name of the column that holds the sequence value.
protected TableJDBCSeq.Status	getStatus(ClassMapping mapping) Return the appropriate status object for the given class, or null if cannot handle the given class.
String	getTable() The sequence table name.
static void	main(String[] args) Usage: java org.apache.openjpa.jdbc.schema.TableJDBCSequence [option]* -action/-a <add | drop | get | set> [value] Where the following options are recognized.
protected Object	nextInternal(JDBCStore store, ClassMapping mapping) Return the next sequence object.
void	refreshTable() Creates the sequence table in the DB.
static boolean	run(JDBCConfiguration conf, String[] args, Options opts) Run the tool.
static boolean	run(JDBCConfiguration conf, String[] args, String action) Run the tool.
void	setAllocate(int alloc) Return the number of sequences to allocate for each update of the sequence table.
void	setConfiguration(Configuration conf) Invoked prior to setting bean properties.
void	setIncrement(int inc) Deprecated. Use setAllocate(int). Retained for backwards compatibility of auto-configuration.
void	setPrimaryKeyColumn(String primaryKeyColumn) The name of the table's primary key column.
protected boolean	setSequence(ClassMapping mapping, TableJDBCSeq.Status stat, int inc, boolean updateStatSeq, Connection conn) Grabs the next handful of sequence numbers.
void	setSequenceColumn(String sequenceColumn) The name of the column that holds the sequence value.
void	setTable(String name) The sequence table name.
void	setTableName(String name) Deprecated. Use setTable(java.lang.String). Retained for backwards-compatibility with auto-configuration.
void	startConfiguration() Invoked before bean property configuration is begun on this object.

Methods inherited from class org.apache.openjpa.jdbc.kernel.AbstractJDBCSeq

allocate, close, closeConnection, current, getConnection, next, setType

Methods inherited from class java.lang.Object

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

Field Detail

ACTION_DROP

public static final String ACTION_DROP

See Also:

Constant Field Values

ACTION_ADD

public static final String ACTION_ADD

See Also:

Constant Field Values

ACTION_GET

public static final String ACTION_GET

See Also:

Constant Field Values

ACTION_SET

public static final String ACTION_SET

See Also:

Constant Field Values

Constructor Detail

TableJDBCSeq

public TableJDBCSeq()

Method Detail

getTable

public String getTable()

The sequence table name. Defaults to OPENJPA_SEQUENCE_TABLE. By default, the table will be placed in the first schema listed in your openjpa.jdbc.Schemas property, or in the default schema if the property is not given. If you specify a table name in the form <schema>.<table>, then the given schema will be used.

setTable

public void setTable(String name)

The sequence table name. Defaults to OPENJPA_SEQUENCE_TABLE. By default, the table will be placed in the first schema listed in your openjpa.jdbc.Schemas property, or in the default schema if the property is not given. If you specify a table name in the form <schema>.<table>, then the given schema will be used.

setTableName

public void setTableName(String name)

Deprecated. Use setTable(java.lang.String). Retained for backwards-compatibility with auto-configuration.

getSequenceColumn

public String getSequenceColumn()

The name of the column that holds the sequence value. Defaults to SEQUENCE_VALUE.

setSequenceColumn

public void setSequenceColumn(String sequenceColumn)

The name of the column that holds the sequence value. Defaults to SEQUENCE_VALUE.

getPrimaryKeyColumn

public String getPrimaryKeyColumn()

The name of the table's primary key column. Defaults to ID.

setPrimaryKeyColumn

public void setPrimaryKeyColumn(String primaryKeyColumn)

The name of the table's primary key column. Defaults to ID.

getAllocate

public int getAllocate()

Return the number of sequences to allocate for each update of the sequence table. Sequence numbers will be grabbed in blocks of this value to reduce the number of transactions that must be performed on the sequence table.

setAllocate

public void setAllocate(int alloc)

Return the number of sequences to allocate for each update of the sequence table. Sequence numbers will be grabbed in blocks of this value to reduce the number of transactions that must be performed on the sequence table.

setIncrement

public void setIncrement(int inc)

Deprecated. Use setAllocate(int). Retained for backwards compatibility of auto-configuration.

getConfiguration

public JDBCConfiguration getConfiguration()

setConfiguration

public void setConfiguration(Configuration conf)

Description copied from interface: Configurable

Invoked prior to setting bean properties.

Specified by:

setConfiguration in interface Configurable

startConfiguration

public void startConfiguration()

Description copied from interface: Configurable

Invoked before bean property configuration is begun on this object.

Specified by:

startConfiguration in interface Configurable

endConfiguration

public void endConfiguration()

Description copied from interface: Configurable

Invoked upon completion of bean property configuration for this object.

Specified by:

endConfiguration in interface Configurable

addSchema

public void addSchema(ClassMapping mapping,
                      SchemaGroup group)

Description copied from class: AbstractJDBCSeq

No-op.

Specified by:

addSchema in interface JDBCSeq

Overrides:

addSchema in class AbstractJDBCSeq

nextInternal

protected Object nextInternal(JDBCStore store,
                              ClassMapping mapping)
                       throws Exception

Description copied from class: AbstractJDBCSeq

Return the next sequence object.

Specified by:

nextInternal in class AbstractJDBCSeq

Throws:

Exception

currentInternal

protected Object currentInternal(JDBCStore store,
                                 ClassMapping mapping)
                          throws Exception

Description copied from class: AbstractJDBCSeq

Return the current sequence object. By default returns the last sequence value used, or null if no sequence values have been requested yet. Default implementation is not threadsafe.

Overrides:

currentInternal in class AbstractJDBCSeq

Throws:

Exception

allocateInternal

protected void allocateInternal(int count,
                                JDBCStore store,
                                ClassMapping mapping)
                         throws SQLException

Description copied from class: AbstractJDBCSeq

Allocate additional sequence values. Does nothing by default.

Overrides:

allocateInternal in class AbstractJDBCSeq

Throws:

SQLException

getStatus

protected TableJDBCSeq.Status getStatus(ClassMapping mapping)

Return the appropriate status object for the given class, or null if cannot handle the given class. The mapping may be null.

addPrimaryKeyColumn

protected Column addPrimaryKeyColumn(Table table)

Add the primary key column to the given table and return it.

getPrimaryKey

protected Object getPrimaryKey(ClassMapping mapping)

Return the primary key value for the given class.

getSequence

protected long getSequence(ClassMapping mapping,
                           Connection conn)
                    throws SQLException

Return the current sequence value, or -1 if unattainable.

Throws:

SQLException

setSequence

protected boolean setSequence(ClassMapping mapping,
                              TableJDBCSeq.Status stat,
                              int inc,
                              boolean updateStatSeq,
                              Connection conn)
                       throws SQLException

Grabs the next handful of sequence numbers.

Returns:

true if the sequence was updated, false if no sequence row existed for this mapping

Throws:

SQLException

refreshTable

public void refreshTable()
                  throws SQLException

Creates the sequence table in the DB.

Throws:

SQLException

dropTable

public void dropTable()
               throws SQLException

Drops the sequence table in the DB.

Throws:

SQLException

main

public static void main(String[] args)
                 throws Exception

Usage: java org.apache.openjpa.jdbc.schema.TableJDBCSequence [option]* -action/-a <add | drop | get | set> [value] Where the following options are recognized.

• -properties/-p <properties file or resource>: The path or resource name of a OpenJPA properties file containing information such as the license key and connection data as outlined in JDBCConfiguration. Optional.
• -<property name> <property value>: All bean properties of the OpenJPA JDBCConfiguration can be set by using their names and supplying a value. For example: -licenseKey adslfja83r3lkadf

The various actions are as follows.

• add: Create the sequence table.
• drop: Drop the sequence table.
• get: Print the current sequence value.
• set: Set the sequence value.

Throws:

Exception

run

public static boolean run(JDBCConfiguration conf,
                          String[] args,
                          Options opts)
                   throws Exception

Run the tool. Returns false if invalid options were given.

Throws:

Exception

run

public static boolean run(JDBCConfiguration conf,
                          String[] args,
                          String action)
                   throws Exception

Run the tool. Return false if an invalid option was given.

Throws:

Exception