org.h2.table

Class RangeTable

java.lang.Object

org.h2.engine.DbObjectBase

org.h2.schema.SchemaObjectBase

org.h2.table.Table

org.h2.table.VirtualTable

org.h2.table.RangeTable

All Implemented Interfaces:

DbObject, SchemaObject

public class RangeTable
extends VirtualTable

The table SYSTEM_RANGE is a virtual table that generates incrementing numbers with a given start end point.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	ALIAS The PostgreSQL alias for the range table.
static java.lang.String	NAME The name of the range table.

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, DOMAIN, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, SYNONYM, TABLE_OR_VIEW, TRIGGER, USER

Constructor Summary

Constructors

Constructor and Description
RangeTable(Schema schema, Expression min, Expression max) Create a new range with the given start and end expressions.
RangeTable(Schema schema, Expression min, Expression max, Expression step)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	canGetRowCount() Check if the row count can be retrieved quickly.
long	getMax(Session session) Calculate and get the end value of this range.
long	getMaxDataModificationId() Get the last data modification id.
long	getMin(Session session) Calculate and get the start value of this range.
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.StringBuilder	getSQL(java.lang.StringBuilder builder, boolean alwaysQuote) Appends the SQL name of this object (may be quoted) to the specified builder.
long	getStep(Session session) Get the increment.
TableType	getTableType() Get the table type name
boolean	isDeterministic() Check if the table is deterministic.

Methods inherited from class org.h2.table.VirtualTable

addIndex, addRow, canDrop, canReference, checkRename, checkSupportAlter, close, getCreateSQL, getDiskSpaceUsed, getDropSQL, getIndexes, getUniqueIndex, isLockedExclusively, lock, removeRow, truncate, unlock

Methods inherited from class org.h2.table.Table

addConstraint, addDependencies, addDependentView, addSequence, addSynonym, addTrigger, canTruncate, checkDeadlock, checkWritingAllowed, compareValues, createRow, doesColumnExist, dropMultipleColumnsConstraintsAndIndexes, findColumn, findPrimaryKey, fire, fireAfterRow, fireBeforeRow, fireRow, getBestPlanItem, getCheckForeignKeyConstraints, getChildren, getColumn, getColumn, getColumn, getColumns, getCompareMode, getConstraints, getCreateSQLForCopy, getDefaultValue, getDependentViews, getIndex, getIndexForColumn, getOnCommitDrop, getOnCommitTruncate, getOnUpdateValue, getPrimaryKey, getRow, getRowIdColumn, getScanIndex, getTemplateRow, getTemplateSimpleRow, getType, hasInsteadOfTrigger, hasSelectTrigger, isGlobalTemporary, isHidden, isLockedExclusivelyBy, isMVStore, isPersistData, isPersistIndexes, isQueryComparable, isTableExpression, isView, lockRow, removeChildrenAndResources, removeColumnExpressionsDependencies, removeConstraint, removeDependentView, removeIndex, removeIndexOrTransferOwnership, removeSequence, removeSynonym, removeTrigger, rename, renameColumn, setCheckForeignKeyConstraints, setColumns, setHidden, setOnCommitDrop, setOnCommitTruncate, setTableExpression, updateRow, updateRows, validateConvertUpdateSequence

Methods inherited from class org.h2.schema.SchemaObjectBase

getSchema, getSQL

Methods inherited from class org.h2.engine.DbObjectBase

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

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

NAME

public static final java.lang.String NAME

The name of the range table.

See Also:

Constant Field Values

ALIAS

public static final java.lang.String ALIAS

The PostgreSQL alias for the range table.

See Also:

Constant Field Values

Constructor Detail

RangeTable

public RangeTable(Schema schema,
          Expression min,
          Expression max)

Create a new range with the given start and end expressions.

Parameters:

schema - the schema (always the main schema)

min - the start expression

max - the end expression

RangeTable

public RangeTable(Schema schema,
          Expression min,
          Expression max,
          Expression step)

Method Detail

getSQL

public java.lang.StringBuilder getSQL(java.lang.StringBuilder builder,
                             boolean alwaysQuote)

Description copied from interface: DbObject

Appends the SQL name of this object (may be quoted) to the specified builder.

Specified by:

getSQL in interface DbObject

Overrides:

getSQL in class SchemaObjectBase

Parameters:

builder - string builder

alwaysQuote - quote all identifiers

Returns:

the specified string builder

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

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

getTableType

public TableType getTableType()

Description copied from class: Table

Get the table type name

Overrides:

getTableType in class VirtualTable

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

getMin

public long getMin(Session session)

Calculate and get the start value of this range.

Parameters:

session - the session

Returns:

the start value

getMax

public long getMax(Session session)

Calculate and get the end value of this range.

Parameters:

session - the session

Returns:

the end value

getStep

public long getStep(Session session)

Get the increment.

Parameters:

session - the session

Returns:

the increment (1 by default)

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

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

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