org.h2.mvstore.db

Class MVTable

java.lang.Object

org.h2.engine.DbObjectBase

org.h2.schema.SchemaObjectBase

org.h2.table.Table

org.h2.table.TableBase

org.h2.mvstore.db.MVTable

All Implemented Interfaces:

DbObject, SchemaObject

public class MVTable
extends TableBase

A table stored in a MVStore.

Field Summary

Fields

Modifier and Type	Field and Description
static DebuggingThreadLocal<java.util.ArrayList<java.lang.String>>	EXCLUSIVE_LOCKS The table names this thread has exclusively locked.
static DebuggingThreadLocal<java.util.ArrayList<java.lang.String>>	SHARED_LOCKS The tables names this thread has a shared lock on.
static DebuggingThreadLocal<java.lang.String>	WAITING_FOR_LOCK The table name this thread is waiting to lock.

Fields inherited from class org.h2.table.Table

columns, compareMode, isHidden, TYPE_CACHED, TYPE_MEMORY

Fields inherited from class org.h2.engine.DbObjectBase

comment, database, trace

Fields inherited from interface org.h2.engine.DbObject

AGGREGATE, COMMENT, CONSTANT, CONSTRAINT, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, SYNONYM, TABLE_OR_VIEW, TRIGGER, USER, USER_DATATYPE

Constructor Summary

Constructors

Constructor and Description
MVTable(CreateTableData data, MVTableEngine.Store store)

Method Summary

Modifier and Type	Method and Description
Index	addIndex(Session session, java.lang.String indexName, int indexId, IndexColumn[] cols, IndexType indexType, boolean create, java.lang.String indexComment) Create an index for this table
void	addRow(Session session, Row row) Add a row to the table and all indexes.
boolean	canDrop() Check if this table can be dropped.
boolean	canGetRowCount() Check if the row count can be retrieved quickly.
boolean	canTruncate() Check if this table can be truncated.
java.util.ArrayList<Session>	checkDeadlock(Session session, Session clash, java.util.Set<Session> visited) Check if a deadlock occurred.
void	checkRename() Check if this object can be renamed.
void	checkSupportAlter() Check if this table supports ALTER TABLE.
void	close(Session session) Close the table object and flush changes.
void	commit() Mark the transaction as committed, so that the modification counter of the database is incremented.
boolean	getContainsLargeObject()
long	getDiskSpaceUsed()
java.util.ArrayList<Index>	getIndexes() Get all indexes for this table.
java.lang.String	getMapName()
long	getMaxDataModificationId() Get the last data modification id.
Row	getRow(Session session, long key) Get the given row.
long	getRowCount(Session session) Get the row count for this table.
long	getRowCountApproximation() Get the approximated row count for this table.
Column	getRowIdColumn() Get the row id column if this table has one.
Index	getScanIndex(Session session) Get the scan index to iterate through all rows.
TableType	getTableType() Get the table type name
Index	getUniqueIndex() Get any unique index for this table if one exists.
boolean	isDeterministic() Check if the table is deterministic.
boolean	isLockedExclusively() Check if this table is locked exclusively.
boolean	isLockedExclusivelyBy(Session session) Check if the table is exclusively locked by this session.
boolean	isMVStore()
boolean	lock(Session session, boolean exclusive, boolean forceLockEvenInMvcc) Lock the table for the given session.
void	removeChildrenAndResources(Session session) Remove all dependent objects and free all resources (files, blocks in files) of this object.
void	removeRow(Session session, Row row) Remove a row from the table and all indexes.
java.lang.String	toString()
void	truncate(Session session) Remove all rows from the table and indexes.
void	unlock(Session s) Release the lock for this session.

Methods inherited from class org.h2.table.TableBase

getCreateSQL, getDropSQL, isGlobalTemporary

Methods inherited from class org.h2.table.Table

addConstraint, addDependencies, addDependentView, addSequence, addSynonym, addTrigger, canReference, checkWritingAllowed, commit, compareTypeSafe, doesColumnExist, dropMultipleColumnsConstraintsAndIndexes, findPrimaryKey, fire, fireAfterRow, fireBeforeRow, fireRow, getBestPlanItem, getCheckForeignKeyConstraints, getChildren, getColumn, getColumn, getColumns, getCompareMode, getConstraints, getCreateSQLForCopy, getDefaultValue, getDependentViews, getIndex, getIndexForColumn, getOnCommitDrop, getOnCommitTruncate, getOnUpdateValue, getPrimaryKey, getScanIndex, getTemplateRow, getTemplateSimpleRow, getType, hasSelectTrigger, isHidden, isPersistData, isPersistIndexes, isQueryComparable, isTableExpression, isView, removeConstraint, removeDependentView, removeIndex, removeIndexOrTransferOwnership, removeSequence, removeSynonym, removeTrigger, rename, renameColumn, setCheckForeignKeyConstraints, setColumns, setHidden, setOnCommitDrop, setOnCommitTruncate, setTableExpression, updateRows, validateConvertUpdateSequence

Methods inherited from class org.h2.schema.SchemaObjectBase

getSchema, getSQL, initSchemaObjectBase

Methods inherited from class org.h2.engine.DbObjectBase

getComment, getDatabase, getId, getModificationId, getName, initDbObjectBase, invalidate, isTemporary, isValid, setComment, setModified, setObjectName, setTemporary

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.h2.engine.DbObject

getComment, getDatabase, getId, getName, isTemporary, setComment, setTemporary

Field Detail

WAITING_FOR_LOCK

public static final DebuggingThreadLocal<java.lang.String> WAITING_FOR_LOCK

The table name this thread is waiting to lock.

EXCLUSIVE_LOCKS

public static final DebuggingThreadLocal<java.util.ArrayList<java.lang.String>> EXCLUSIVE_LOCKS

The table names this thread has exclusively locked.

SHARED_LOCKS

public static final DebuggingThreadLocal<java.util.ArrayList<java.lang.String>> SHARED_LOCKS

The tables names this thread has a shared lock on.

Constructor Detail

MVTable

public MVTable(CreateTableData data,
               MVTableEngine.Store store)

Method Detail

getMapName

public java.lang.String getMapName()

lock

public boolean lock(Session session,
                    boolean exclusive,
                    boolean forceLockEvenInMvcc)

Description copied from class: Table

Lock the table for the given session. This method waits until the lock is granted.

Specified by:

lock in class Table

Parameters:

session - the session

exclusive - true for write locks, false for read locks

forceLockEvenInMvcc - lock even in the MVCC mode

Returns:

true if the table was already exclusively locked by this session.

checkDeadlock

public java.util.ArrayList<Session> checkDeadlock(Session session,
                                                  Session clash,
                                                  java.util.Set<Session> visited)

Description copied from class: Table

Check if a deadlock occurred. This method is called recursively. There is a circle if the session to be tested has already being visited. If this session is part of the circle (if it is the clash session), the method must return an empty object array. Once a deadlock has been detected, the methods must add the session to the list. If this session is not part of the circle, or if no deadlock is detected, this method returns null.

Overrides:

checkDeadlock in class Table

Parameters:

session - the session to be tested for

clash - set with sessions already visited, and null when starting verification

visited - set with sessions already visited, and null when starting verification

Returns:

an object array with the sessions involved in the deadlock, or null

isLockedExclusively

public boolean isLockedExclusively()

Description copied from class: Table

Check if this table is locked exclusively.

Specified by:

isLockedExclusively in class Table

Returns:

true if it is.

isLockedExclusivelyBy

public boolean isLockedExclusivelyBy(Session session)

Description copied from class: Table

Check if the table is exclusively locked by this session.

Overrides:

isLockedExclusivelyBy in class Table

Parameters:

session - the session

Returns:

true if it is

unlock

public void unlock(Session s)

Description copied from class: Table

Release the lock for this session.

Specified by:

unlock in class Table

Parameters:

s - the session

canTruncate

public boolean canTruncate()

Description copied from class: Table

Check if this table can be truncated.

Overrides:

canTruncate in class Table

Returns:

true if it can

close

public void close(Session session)

Description copied from class: Table

Close the table object and flush changes.

Specified by:

close in class Table

Parameters:

session - the session

getRow

public Row getRow(Session session,
                  long key)

Description copied from class: Table

Get the given row.

Overrides:

getRow in class Table

Parameters:

session - the session

key - the primary key

Returns:

the row

addIndex

public Index addIndex(Session session,
                      java.lang.String indexName,
                      int indexId,
                      IndexColumn[] cols,
                      IndexType indexType,
                      boolean create,
                      java.lang.String indexComment)

Description copied from class: Table

Create an index for this table

Specified by:

addIndex in class Table

Parameters:

session - the session

indexName - the name of the index

indexId - the id

cols - the index columns

indexType - the index type

create - whether this is a new index

indexComment - the comment

Returns:

the index

removeRow

public void removeRow(Session session,
                      Row row)

Description copied from class: Table

Remove a row from the table and all indexes.

Specified by:

removeRow in class Table

Parameters:

session - the session

row - the row

truncate

public void truncate(Session session)

Description copied from class: Table

Remove all rows from the table and indexes.

Specified by:

truncate in class Table

Parameters:

session - the session

addRow

public void addRow(Session session,
                   Row row)

Description copied from class: Table

Add a row to the table and all indexes.

Specified by:

addRow in class Table

Parameters:

session - the session

row - the row

checkSupportAlter

public void checkSupportAlter()

Description copied from class: Table

Check if this table supports ALTER TABLE.

Specified by:

checkSupportAlter in class Table

getTableType

public TableType getTableType()

Description copied from class: Table

Get the table type name

Specified by:

getTableType in class Table

Returns:

the table type name

getScanIndex

public Index getScanIndex(Session session)

Description copied from class: Table

Get the scan index to iterate through all rows.

Specified by:

getScanIndex in class Table

Parameters:

session - the session

Returns:

the index

getUniqueIndex

public Index getUniqueIndex()

Description copied from class: Table

Get any unique index for this table if one exists.

Specified by:

getUniqueIndex in class Table

Returns:

a unique index

getIndexes

public java.util.ArrayList<Index> getIndexes()

Description copied from class: Table

Get all indexes for this table.

Specified by:

getIndexes in class Table

Returns:

the list of indexes

getMaxDataModificationId

public long getMaxDataModificationId()

Description copied from class: Table

Get the last data modification id.

Specified by:

getMaxDataModificationId in class Table

Returns:

the modification id

getContainsLargeObject

public boolean getContainsLargeObject()

isDeterministic

public boolean isDeterministic()

Description copied from class: Table

Check if the table is deterministic.

Specified by:

isDeterministic in class Table

Returns:

true if it is

canGetRowCount

public boolean canGetRowCount()

Description copied from class: Table

Check if the row count can be retrieved quickly.

Specified by:

canGetRowCount in class Table

Returns:

true if it can

canDrop

public boolean canDrop()

Description copied from class: Table

Check if this table can be dropped.

Specified by:

canDrop in class Table

Returns:

true if it can

removeChildrenAndResources

public void removeChildrenAndResources(Session session)

Description copied from class: DbObjectBase

Remove all dependent objects and free all resources (files, blocks in files) of this object.

Specified by:

removeChildrenAndResources in interface DbObject

Overrides:

removeChildrenAndResources in class Table

Parameters:

session - the session

getRowCount

public long getRowCount(Session session)

Description copied from class: Table

Get the row count for this table.

Specified by:

getRowCount in class Table

Parameters:

session - the session

Returns:

the row count

getRowCountApproximation

public long getRowCountApproximation()

Description copied from class: Table

Get the approximated row count for this table.

Specified by:

getRowCountApproximation in class Table

Returns:

the approximated row count

getDiskSpaceUsed

public long getDiskSpaceUsed()

Specified by:

getDiskSpaceUsed in class Table

checkRename

public void checkRename()

Description copied from class: DbObjectBase

Check if this object can be renamed. System objects may not be renamed.

Specified by:

checkRename in interface DbObject

Specified by:

checkRename in class DbObjectBase

getRowIdColumn

public Column getRowIdColumn()

Description copied from class: Table

Get the row id column if this table has one.

Overrides:

getRowIdColumn in class Table

Returns:

the row id column, or null

toString

public java.lang.String toString()

Overrides:

toString in class DbObjectBase

isMVStore

public boolean isMVStore()

Overrides:

isMVStore in class Table

commit

public void commit()

Mark the transaction as committed, so that the modification counter of the database is incremented.