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java.lang.Objectorg.h2.engine.DbObjectBase
org.h2.schema.SchemaObjectBase
org.h2.index.BaseIndex
org.h2.index.PageIndex
org.h2.index.PageBtreeIndex
public class PageBtreeIndex
This is the most common type of index, a b tree index. Only the data of the indexed columns are stored in the index.
Field Summary |
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Fields inherited from class org.h2.index.PageIndex |
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rootPageId |
Fields inherited from class org.h2.index.BaseIndex |
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columnIds, columns, indexColumns, indexType, isMultiVersion, table |
Fields inherited from class org.h2.engine.DbObjectBase |
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comment, database, trace |
Fields inherited from interface org.h2.engine.DbObject |
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AGGREGATE, COMMENT, CONSTANT, CONSTRAINT, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, TABLE_OR_VIEW, TRIGGER, USER, USER_DATATYPE |
Constructor Summary | |
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PageBtreeIndex(RegularTable table,
int id,
java.lang.String indexName,
IndexColumn[] columns,
IndexType indexType,
boolean create,
Session session)
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Method Summary | |
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void |
add(Session session,
Row row)
Add a row to this index. |
boolean |
canFindNext()
Check if the index can get the next higher value. |
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. |
Cursor |
findNext(Session session,
SearchRow first,
SearchRow last)
Find a row or a list of rows that is larger and create a cursor to iterate over the result. |
double |
getCost(Session session,
int[] masks)
Calculate the cost to find rows. |
Row |
getRow(Session session,
long key)
Get a row from the main index. |
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 |
writeRowCount()
Write back the row count if it has changed. |
Methods inherited from class org.h2.index.PageIndex |
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getRootPageId, setSortedInsertMode |
Methods inherited from class org.h2.index.BaseIndex |
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commit, compareKeys, compareRows, containsNullAndAllowMultipleNull, getColumnIndex, getColumnListSQL, getColumns, getCostRangeIndex, getCreateSQL, getCreateSQLForCopy, getDropSQL, getDuplicateKeyException, getIndexColumns, getIndexType, getLookupCost, getPlanSQL, getTable, getType, initBaseIndex, isHidden, removeChildrenAndResources |
Methods inherited from class org.h2.schema.SchemaObjectBase |
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getSchema, getSQL, initSchemaObjectBase |
Methods inherited from class org.h2.engine.DbObjectBase |
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getChildren, getComment, getDatabase, getId, getModificationId, getName, initDbObjectBase, invalidate, isTemporary, rename, setComment, setModified, setObjectName, setTemporary, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.h2.schema.SchemaObject |
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getSchema |
Methods inherited from interface org.h2.engine.DbObject |
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getChildren, getComment, getDatabase, getId, getModificationId, getName, getSQL, isTemporary, rename, setComment, setModified, setTemporary |
Constructor Detail |
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public PageBtreeIndex(RegularTable table, int id, java.lang.String indexName, IndexColumn[] columns, IndexType indexType, boolean create, Session session)
Method Detail |
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public void add(Session session, Row row)
BaseIndex
add
in interface Index
add
in class BaseIndex
session
- the sessionrow
- the row to addpublic boolean canGetFirstOrLast()
BaseIndex
canGetFirstOrLast
in interface Index
canGetFirstOrLast
in class BaseIndex
public Cursor findNext(Session session, SearchRow first, SearchRow last)
BaseIndex
findNext
in interface Index
findNext
in class BaseIndex
session
- the sessionfirst
- the lower limit (excluding)last
- the last row, or null for no limit
public Cursor find(Session session, SearchRow first, SearchRow last)
BaseIndex
find
in interface Index
find
in class BaseIndex
session
- the sessionfirst
- the first row to return (null if no limit)last
- the last row to return (null if no limit)
public Cursor findFirstOrLast(Session session, boolean first)
BaseIndex
findFirstOrLast
in interface Index
findFirstOrLast
in class BaseIndex
session
- the sessionfirst
- true for the first value, false for the last
public double getCost(Session session, int[] masks)
BaseIndex
getCost
in interface Index
getCost
in class BaseIndex
session
- the sessionmasks
- the condition mask
public boolean needRebuild()
BaseIndex
needRebuild
in interface Index
needRebuild
in class BaseIndex
public void remove(Session session, Row row)
BaseIndex
remove
in interface Index
remove
in class BaseIndex
session
- the sessionrow
- the rowpublic void remove(Session session)
BaseIndex
remove
in interface Index
remove
in class BaseIndex
session
- the sessionpublic void truncate(Session session)
BaseIndex
truncate
in interface Index
truncate
in class BaseIndex
session
- the sessionpublic void checkRename()
DbObjectBase
checkRename
in interface DbObject
checkRename
in class DbObjectBase
public Row getRow(Session session, long key)
getRow
in interface Index
getRow
in class BaseIndex
session
- the sessionkey
- the row key
public long getRowCountApproximation()
Index
public long getRowCount(Session session)
Index
session
- the session
public void close(Session session)
BaseIndex
close
in interface Index
close
in class BaseIndex
session
- the sessionpublic boolean canFindNext()
Index
canFindNext
in interface Index
canFindNext
in class BaseIndex
public void writeRowCount()
PageIndex
writeRowCount
in class PageIndex
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