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java.lang.Objectorg.h2.engine.DbObjectBase
org.h2.schema.SchemaObjectBase
org.h2.index.BaseIndex
org.h2.index.MetaIndex
public class MetaIndex
The index implementation for meta data tables.
Field Summary |
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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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MetaIndex(MetaTable meta,
IndexColumn[] columns,
boolean scan)
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Method Summary | |
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void |
add(Session session,
Row row)
Add a row to the index. |
boolean |
canGetFirstOrLast()
Check if the index can directly look up the lowest or highest value of a column. |
void |
checkRename()
Check if this object can be renamed. |
void |
close(Session session)
Close this index. |
Cursor |
find(Session session,
SearchRow first,
SearchRow last)
Find a row or a list of rows and create a cursor to iterate over the result. |
Cursor |
findFirstOrLast(Session session,
boolean first)
Find the first (or last) value of this index. |
int |
getColumnIndex(Column col)
Get the index of a column in the list of index columns |
double |
getCost(Session session,
int[] masks)
Estimate the cost to search for rows given the search mask. |
java.lang.String |
getCreateSQL()
Build a SQL statement to re-create this object. |
java.lang.String |
getPlanSQL()
Get the message to show in a EXPLAIN statement. |
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 the index needs to be rebuilt. |
void |
remove(Session session)
Remove the index. |
void |
remove(Session session,
Row row)
Remove a row from the index. |
void |
truncate(Session session)
Remove all rows from the index. |
Methods inherited from class org.h2.index.BaseIndex |
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canFindNext, canScan, commit, compareRows, find, findNext, getColumns, getCreateSQLForCopy, getDropSQL, getIndexColumns, getIndexType, getRow, getTable, getType, initBaseIndex, isHidden, isRowIdIndex, removeChildrenAndResources, setSortedInsertMode |
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, getName, getSQL, isTemporary, rename, setComment, setTemporary |
Constructor Detail |
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public MetaIndex(MetaTable meta, IndexColumn[] columns, boolean scan)
Method Detail |
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public void close(Session session)
Index
session
- the session used to write datapublic void add(Session session, Row row)
Index
session
- the session to userow
- the row to addpublic void remove(Session session, Row row)
Index
session
- the sessionrow
- the rowpublic Cursor find(Session session, SearchRow first, SearchRow last)
Index
session
- the sessionfirst
- the first row, or null for no limitlast
- the last row, or null for no limit
public double getCost(Session session, int[] masks)
Index
session
- the sessionmasks
- the search mask
public void truncate(Session session)
Index
session
- the sessionpublic void remove(Session session)
Index
session
- the sessionpublic int getColumnIndex(Column col)
Index
getColumnIndex
in interface Index
getColumnIndex
in class BaseIndex
col
- the column
public void checkRename()
DbObjectBase
checkRename
in interface DbObject
checkRename
in class DbObjectBase
public boolean needRebuild()
Index
public java.lang.String getCreateSQL()
DbObjectBase
getCreateSQL
in interface DbObject
getCreateSQL
in class BaseIndex
public boolean canGetFirstOrLast()
Index
public Cursor findFirstOrLast(Session session, boolean first)
Index
session
- the sessionfirst
- true if the first (lowest for ascending indexes) or last
value should be returned
public long getRowCount(Session session)
Index
session
- the session
public long getRowCountApproximation()
Index
public java.lang.String getPlanSQL()
Index
getPlanSQL
in interface Index
getPlanSQL
in class BaseIndex
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