org.h2.table
Class TableData

java.lang.Object
  org.h2.engine.DbObjectBase
      org.h2.schema.SchemaObjectBase
          org.h2.table.Table
              org.h2.table.TableData

All Implemented Interfaces:

DbObject, SchemaObject, RecordReader

public class TableData
extends Table
implements RecordReader

Most tables are an instance of this class. For this table, the data is stored in the database. The actual data is not kept here, instead it is kept in the indexes. There is at least one index, the scan index.

Field Summary

Fields inherited from class org.h2.table.Table

columns, compareMode, memoryPerRow, SYSTEM_TABLE, TABLE, TABLE_LINK, TYPE_CACHED, TYPE_MEMORY, VIEW

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, TABLE_OR_VIEW, TRIGGER, USER, USER_DATATYPE

Constructor Summary

TableData(CreateTableData data)

Method Summary

Index	addIndex(Session session, java.lang.String indexName, int indexId, IndexColumn[] cols, IndexType indexType, int headPos, 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.
ObjectArray<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.
Row	createRow(Value[] data) Create a row from the values.
boolean	getContainsLargeObject()
java.lang.String	getCreateSQL() Build a SQL statement to re-create this object.
java.lang.String	getDropSQL() Build a SQL statement to drop this object.
int	getHeadPos() Get the position of the head record.
ObjectArray<Index>	getIndexes() Get all indexes for this table.
long	getMaxDataModificationId() Get the last data modification id.
Row	getRow(Session session, long key) Read the given row.
long	getRowCount(Session session) Get the row count for this table.
long	getRowCountApproximation() Get the approximated row count for this table.
Index	getScanIndex(Session session) Get the scan index to iterate through all rows.
java.lang.String	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	isGlobalTemporary()
boolean	isLockedExclusively() Check if this table is locked exclusively.
void	lock(Session session, boolean exclusive, boolean force) Lock the table for the given session.
Record	read(Session session, DataPage s) Read a record from the data page.
Row	readRow(DataPage s) Read a row from the data page.
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.
void	setCompareMode(CompareMode compareMode)
void	setGlobalTemporary(boolean globalTemporary)
void	setRowCount(long count) Set the row count of this table.
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.Table

addConstraint, addDependencies, addSequence, addTrigger, addView, checkColumnIsNotReferenced, checkWritingAllowed, compareTypeSave, findPrimaryKey, fireAfter, fireAfterRow, fireBefore, fireBeforeRow, fireRow, getBestPlanItem, getCheckForeignKeyConstraints, getChildren, getColumn, getColumn, getColumns, getCompareMode, getConstraints, getCreateSQLForCopy, getDefaultValue, getIndexForColumn, getOnCommitDrop, getOnCommitTruncate, getPrimaryKey, getTemplateRow, getTemplateSimpleRow, getType, isPersistData, isPersistIndexes, removeConstraint, removeIndex, removeIndexOrTransferOwnership, removeSequence, removeTrigger, rename, renameColumn, setCheckForeignKeyConstraints, setColumns, setOnCommitDrop, setOnCommitTruncate, 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, 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, getModificationId, getName, isTemporary, setComment, setModified, setTemporary

Constructor Detail

TableData

public TableData(CreateTableData data)
          throws java.sql.SQLException

Throws:

java.sql.SQLException

Method Detail

getHeadPos

public int getHeadPos()

Description copied from interface: DbObject

Get the position of the head record.

Specified by:

getHeadPos in interface DbObject

Overrides:

getHeadPos in class DbObjectBase

Returns:

the head position

close

public void close(Session session)
           throws java.sql.SQLException

Description copied from class: Table

Close the table object and flush changes.

Specified by:

close in class Table

Parameters:

session - the session

Throws:

java.sql.SQLException

getRow

public Row getRow(Session session,
                  long key)
           throws java.sql.SQLException

Read the given row.

Parameters:

session - the session

key - unique key

Returns:

the row

Throws:

java.sql.SQLException

addRow

public void addRow(Session session,
                   Row row)
            throws java.sql.SQLException

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

Throws:

java.sql.SQLException - if a constraint was violated

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 ObjectArray<Index> getIndexes()

Description copied from class: Table

Get all indexes for this table.

Specified by:

getIndexes in class Table

Returns:

the list of indexes

addIndex

public Index addIndex(Session session,
                      java.lang.String indexName,
                      int indexId,
                      IndexColumn[] cols,
                      IndexType indexType,
                      int headPos,
                      java.lang.String indexComment)
               throws java.sql.SQLException

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

headPos - the position of the head (if the index already exists)

indexComment - the comment

Returns:

the index

Throws:

java.sql.SQLException

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

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

removeRow

public void removeRow(Session session,
                      Row row)
               throws java.sql.SQLException

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

Throws:

java.sql.SQLException

truncate

public void truncate(Session session)
              throws java.sql.SQLException

Description copied from class: Table

Remove all rows from the table and indexes.

Specified by:

truncate in class Table

Parameters:

session - the session

Throws:

java.sql.SQLException

lock

public void lock(Session session,
                 boolean exclusive,
                 boolean force)
          throws java.sql.SQLException

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

force - lock even in the MVCC mode

Throws:

java.sql.SQLException - if a lock timeout occurred

checkDeadlock

public ObjectArray<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

getDropSQL

public java.lang.String getDropSQL()

Description copied from class: DbObjectBase

Build a SQL statement to drop this object.

Specified by:

getDropSQL in interface DbObject

Specified by:

getDropSQL in class DbObjectBase

Returns:

the SQL statement

getCreateSQL

public java.lang.String getCreateSQL()

Description copied from class: DbObjectBase

Build a SQL statement to re-create this object.

Specified by:

getCreateSQL in interface DbObject

Specified by:

getCreateSQL in class DbObjectBase

Returns:

the SQL statement

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.

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

read

public Record read(Session session,
                   DataPage s)
            throws java.sql.SQLException

Description copied from interface: RecordReader

Read a record from the data page.

Specified by:

read in interface RecordReader

Parameters:

session - the session

s - the data page

Returns:

the record

Throws:

java.sql.SQLException

readRow

public Row readRow(DataPage s)
            throws java.sql.SQLException

Read a row from the data page.

Parameters:

s - the data page

Returns:

the row

Throws:

java.sql.SQLException

createRow

public Row createRow(Value[] data)

Create a row from the values.

Parameters:

data - the value list

Returns:

the row

setRowCount

public void setRowCount(long count)

Set the row count of this table.

Parameters:

count - the row count

removeChildrenAndResources

public void removeChildrenAndResources(Session session)
                                throws java.sql.SQLException

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

Throws:

java.sql.SQLException

toString

public java.lang.String toString()

Overrides:

toString in class DbObjectBase

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

checkSupportAlter

public void checkSupportAlter()

Description copied from class: Table

Check if this table supports ALTER TABLE.

Specified by:

checkSupportAlter in class Table

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

getTableType

public java.lang.String getTableType()

Description copied from class: Table

Get the table type name

Specified by:

getTableType in class Table

Returns:

the table type name

setGlobalTemporary

public void setGlobalTemporary(boolean globalTemporary)

isGlobalTemporary

public boolean isGlobalTemporary()

Overrides:

isGlobalTemporary in class Table

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()

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

setCompareMode

public void setCompareMode(CompareMode compareMode)

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