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java.lang.Objectorg.h2.engine.DbObjectBase
org.h2.schema.SchemaObjectBase
org.h2.index.BaseIndex
org.h2.index.HashIndex
public class HashIndex
An unique index based on an in-memory hash map.
Field Summary | |
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protected int |
indexColumn
The index of the indexed column. |
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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HashIndex(RegularTable table,
int id,
java.lang.String indexName,
IndexColumn[] columns,
IndexType indexType)
|
Method Summary | |
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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. |
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. |
Methods inherited from class org.h2.index.BaseIndex |
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canFindNext, commit, compareKeys, compareRows, containsNullAndAllowMultipleNull, findNext, getColumnIndex, getColumnListSQL, getColumns, getCostRangeIndex, getCreateSQL, getCreateSQLForCopy, getDropSQL, getDuplicateKeyException, getIndexColumns, getIndexType, getLookupCost, getPlanSQL, getRootPageId, getRow, 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 |
Field Detail |
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protected final int indexColumn
Constructor Detail |
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public HashIndex(RegularTable table, int id, java.lang.String indexName, IndexColumn[] columns, IndexType indexType)
Method Detail |
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public void truncate(Session session)
BaseIndex
truncate
in interface Index
truncate
in class BaseIndex
session
- the sessionpublic void add(Session session, Row row)
BaseIndex
add
in interface Index
add
in class BaseIndex
session
- the sessionrow
- the row to addpublic void remove(Session session, Row row)
BaseIndex
remove
in interface Index
remove
in class BaseIndex
session
- the sessionrow
- the rowpublic 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 long getRowCount(Session session)
Index
session
- the session
public long getRowCountApproximation()
Index
public void close(Session session)
BaseIndex
close
in interface Index
close
in class BaseIndex
session
- the sessionpublic void remove(Session session)
BaseIndex
remove
in interface Index
remove
in class BaseIndex
session
- the sessionpublic double getCost(Session session, int[] masks)
BaseIndex
getCost
in interface Index
getCost
in class BaseIndex
session
- the sessionmasks
- the condition mask
public void checkRename()
DbObjectBase
checkRename
in interface DbObject
checkRename
in class DbObjectBase
public boolean needRebuild()
BaseIndex
needRebuild
in interface Index
needRebuild
in class BaseIndex
public boolean canGetFirstOrLast()
BaseIndex
canGetFirstOrLast
in interface Index
canGetFirstOrLast
in class BaseIndex
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
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