org.h2.index
Class LinkedIndex

java.lang.Object
  extended by org.h2.engine.DbObjectBase
      extended by org.h2.schema.SchemaObjectBase
          extended by org.h2.index.BaseIndex
              extended by org.h2.index.LinkedIndex
All Implemented Interfaces:
DbObject, Index, SchemaObject

public class LinkedIndex
extends BaseIndex

A linked index is a index for a linked (remote) table. It is backed by an index on the remote table which is accessed over JDBC.


Field Summary
 
Fields inherited from class org.h2.index.BaseIndex
columnIds, columns, indexColumns, indexType, isMultiVersion, table
 
Fields inherited from class org.h2.engine.DbObjectBase
comment, database, trace
 
Fields inherited from interface org.h2.index.Index
EMPTY_HEAD
 
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
LinkedIndex(TableLink table, int id, IndexColumn[] columns, IndexType indexType)
           
 
Method Summary
 void add(Session session, Row row)
          Add a row to this index.
 boolean canGetFirstOrLast()
          Check if this index can quickly find the first or last value.
 void checkRename()
          Check if this object can be renamed.
 void close(Session session)
          Close this index.
 Cursor find(Session session, SearchRow first, SearchRow last)
          Create a cursor to iterate over a number of rows.
 Cursor findFirstOrLast(Session session, boolean first)
          Find the first (or last) value of this index.
 double getCost(Session session, int[] masks)
          Calculate the cost to find rows.
 java.lang.String getCreateSQL()
          Build a SQL statement to re-create this object.
 long getRowCount(Session session)
          Get the row count of this table, for the given session.
 long getRowCountApproximation()
          Get the approximated row count for this table.
 boolean needRebuild()
          Check if this index needs to be re-built.
 void remove(Session session)
          Remove the index.
 void remove(Session session, Row row)
          Remove a row from the index.
 void truncate(Session session)
          Truncate the index.
 void update(Row oldRow, Row newRow)
          Update a row using a UPDATE statement.
 
Methods inherited from class org.h2.index.BaseIndex
canFindNext, commit, compareKeys, compareRows, containsNullAndAllowMultipleNull, findNext, getColumnIndex, getColumnListSQL, getColumns, getCostRangeIndex, getCreateSQLForCopy, getDropSQL, getDuplicateKeyException, getIndexColumns, getIndexType, getLookupCost, getPlanSQL, getRootPageId, getTable, getType, removeChildrenAndResources
 
Methods inherited from class org.h2.schema.SchemaObjectBase
getSchema, getSQL, initSchemaObjectBase
 
Methods inherited from class org.h2.engine.DbObjectBase
getChildren, getComment, getDatabase, getHeadPos, getId, getModificationId, getName, initDbObjectBase, invalidate, isTemporary, rename, 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.schema.SchemaObject
getSchema
 
Methods inherited from interface org.h2.engine.DbObject
getChildren, getComment, getDatabase, getHeadPos, getId, getModificationId, getName, getSQL, isTemporary, rename, setComment, setModified, setTemporary
 

Constructor Detail

LinkedIndex

public LinkedIndex(TableLink table,
                   int id,
                   IndexColumn[] columns,
                   IndexType indexType)
Method Detail

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
Overrides:
getCreateSQL in class BaseIndex
Returns:
the SQL statement

close

public void close(Session session)
Description copied from class: BaseIndex
Close this index.

Specified by:
close in interface Index
Specified by:
close in class BaseIndex
Parameters:
session - the session

add

public void add(Session session,
                Row row)
         throws java.sql.SQLException
Description copied from class: BaseIndex
Add a row to this index.

Specified by:
add in interface Index
Specified by:
add in class BaseIndex
Parameters:
session - the session
row - the row to add
Throws:
java.sql.SQLException

find

public Cursor find(Session session,
                   SearchRow first,
                   SearchRow last)
            throws java.sql.SQLException
Description copied from class: BaseIndex
Create a cursor to iterate over a number of rows.

Specified by:
find in interface Index
Specified by:
find in class BaseIndex
Parameters:
session - the session
first - the first row to return (null if no limit)
last - the last row to return (null if no limit)
Returns:
the cursor to iterate over the results
Throws:
java.sql.SQLException

getCost

public double getCost(Session session,
                      int[] masks)
Description copied from class: BaseIndex
Calculate the cost to find rows.

Specified by:
getCost in interface Index
Specified by:
getCost in class BaseIndex
Parameters:
session - the session
masks - the condition mask
Returns:
the cost

remove

public void remove(Session session)
Description copied from class: BaseIndex
Remove the index.

Specified by:
remove in interface Index
Specified by:
remove in class BaseIndex
Parameters:
session - the session

truncate

public void truncate(Session session)
Description copied from class: BaseIndex
Truncate the index.

Specified by:
truncate in interface Index
Specified by:
truncate in class BaseIndex
Parameters:
session - the session

checkRename

public void checkRename()
                 throws java.sql.SQLException
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
Throws:
java.sql.SQLException - if renaming is not allowed

needRebuild

public boolean needRebuild()
Description copied from class: BaseIndex
Check if this index needs to be re-built.

Specified by:
needRebuild in interface Index
Specified by:
needRebuild in class BaseIndex
Returns:
true if it must be re-built.

canGetFirstOrLast

public boolean canGetFirstOrLast()
Description copied from class: BaseIndex
Check if this index can quickly find the first or last value.

Specified by:
canGetFirstOrLast in interface Index
Specified by:
canGetFirstOrLast in class BaseIndex
Returns:
true if it can

findFirstOrLast

public Cursor findFirstOrLast(Session session,
                              boolean first)
                       throws java.sql.SQLException
Description copied from class: BaseIndex
Find the first (or last) value of this index. The cursor returned is positioned on the correct row, or on null if no row has been found.

Specified by:
findFirstOrLast in interface Index
Specified by:
findFirstOrLast in class BaseIndex
Parameters:
session - the session
first - true for the first value, false for the last
Returns:
a cursor (never null)
Throws:
java.sql.SQLException

remove

public void remove(Session session,
                   Row row)
            throws java.sql.SQLException
Description copied from class: BaseIndex
Remove a row from the index.

Specified by:
remove in interface Index
Specified by:
remove in class BaseIndex
Parameters:
session - the session
row - the row
Throws:
java.sql.SQLException

update

public void update(Row oldRow,
                   Row newRow)
            throws java.sql.SQLException
Update a row using a UPDATE statement. This method is to be called if the emit updates option is enabled.

Parameters:
oldRow - the old data
newRow - the new data
Throws:
java.sql.SQLException

getRowCount

public long getRowCount(Session session)
Description copied from interface: Index
Get the row count of this table, for the given session.

Parameters:
session - the session
Returns:
the row count

getRowCountApproximation

public long getRowCountApproximation()
Description copied from interface: Index
Get the approximated row count for this table.

Returns:
the approximated row count