org.h2.table

类 MetaTable

java.lang.Object

org.h2.engine.DbObject

org.h2.schema.SchemaObject

org.h2.table.Table

org.h2.table.MetaTable

所有已实现的接口:

HasSQL

直接已知子类:

InformationSchemaTable, InformationSchemaTableLegacy, PgCatalogTable

public abstract class MetaTable
extends Table

This class is responsible to build the database meta data pseudo tables.

字段概要

字段

限定符和类型	字段和说明
protected int	indexColumn The indexed column.
protected MetaIndex	metaIndex The index for this table.
static long	ROW_COUNT_APPROXIMATION The approximate number of rows of a meta table.
protected int	type The table type.

从类继承的字段 org.h2.table.Table

columns, compareMode, EXCLUSIVE_LOCK, isHidden, READ_LOCK, TYPE_CACHED, TYPE_MEMORY, WRITE_LOCK

从类继承的字段 org.h2.engine.DbObject

AGGREGATE, comment, COMMENT, CONSTANT, CONSTRAINT, database, DOMAIN, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, SYNONYM, TABLE_OR_VIEW, trace, TRIGGER, USER

从接口继承的字段 org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

构造器概要

构造器

限定符	构造器和说明
protected	MetaTable(Schema schema, int id, int type) Create a new metadata table.

方法概要

限定符和类型	方法和说明
protected void	add(SessionLocal session, ArrayList<Row> rows, Object... stringsOrValues) Add a row to a list.
Index	addIndex(SessionLocal session, String indexName, int indexId, IndexColumn[] cols, int uniqueColumnCount, IndexType indexType, boolean create, String indexComment) Create an index for this table
void	addRow(SessionLocal session, Row row) Add a row to the table and all indexes.
boolean	canDrop() Check if this table can be dropped.
boolean	canGetRowCount(SessionLocal session) Check if the row count can be retrieved quickly.
boolean	canReference() Check if this table can be referenced.
protected boolean	checkIndex(SessionLocal session, String value, Value indexFrom, Value indexTo) Checks index conditions.
void	checkRename() Check if renaming is allowed.
void	checkSupportAlter() Check if this table supports ALTER TABLE.
void	close(SessionLocal session) Close the table object and flush changes.
protected Column	column(String name, TypeInfo type) Creates a column with the specified name and data type.
abstract ArrayList<Row>	generateRows(SessionLocal session, SearchRow first, SearchRow last) Generate the data for the given metadata table using the given first and last row filters.
String	getCreateSQL() Construct the CREATE ...
ArrayList<Index>	getIndexes() Get all indexes for this table.
long	getRowCount(SessionLocal session) Get the row count for this table.
long	getRowCountApproximation(SessionLocal session) Get the approximated row count for this table.
Index	getScanIndex(SessionLocal session) Get the scan index to iterate through all rows.
TableType	getTableType() Get the table type name
protected boolean	hideTable(Table table, SessionLocal session) Check whether to hide the table.
protected String	identifier(String s) If needed, convert the identifier to lower case.
boolean	isDeterministic() Check if the table is deterministic.
boolean	isInsertable() Returns whether this table is insertable.
void	removeChildrenAndResources(SessionLocal session) Delete all dependent children objects and resources of this object.
void	removeRow(SessionLocal session, Row row) Remove a row from the table and all indexes.
protected void	setMetaTableName(String upperName)
long	truncate(SessionLocal session) Remove all rows from the table and indexes.

从类继承的方法 org.h2.table.Table

addConstraint, addDependencies, addDependentView, addSequence, addSynonym, addTrigger, canTruncate, checkDeadlock, checkWritingAllowed, compareValues, convertInsertRow, convertUpdateRow, createRow, doesColumnExist, dropMultipleColumnsConstraintsAndIndexes, findColumn, findPrimaryKey, fire, fireAfterRow, fireBeforeRow, fireRow, getBestPlanItem, getCheckForeignKeyConstraints, getChildren, getColumn, getColumn, getColumn, getColumns, getCompareMode, getConstraints, getDependentViews, getDiskSpaceUsed, getIdentityColumn, getIndex, getIndexForColumn, getMainIndexColumn, getMaxDataModificationId, getNullRow, getOnCommitDrop, getOnCommitTruncate, getPrimaryKey, getRow, getRowFactory, getRowIdColumn, getScanIndex, getSQLTableType, getTemplateRow, getTemplateSimpleRow, getTriggers, getType, hasSelectTrigger, isGlobalTemporary, isHidden, isLockedExclusively, isLockedExclusivelyBy, isPersistData, isPersistIndexes, isQueryComparable, isRowLockable, isTableExpression, isView, lock, lockRow, removeColumnExpressionsDependencies, removeConstraint, removeDependentView, removeIndex, removeIndexOrTransferOwnership, removeSequence, removeSynonym, removeTrigger, rename, renameColumn, setCheckForeignKeyConstraints, setColumns, setHidden, setOnCommitDrop, setOnCommitTruncate, setTableExpression, unlock, updateRow, updateRows

从类继承的方法 org.h2.schema.SchemaObject

getSchema, getSQL, getSQL

从类继承的方法 org.h2.engine.DbObject

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

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

从接口继承的方法 org.h2.util.HasSQL

getTraceSQL

字段详细资料

ROW_COUNT_APPROXIMATION

public static final long ROW_COUNT_APPROXIMATION

The approximate number of rows of a meta table.

另请参阅:

常量字段值

type

protected final int type

The table type.

indexColumn

protected int indexColumn

The indexed column.

metaIndex

protected MetaIndex metaIndex

The index for this table.

构造器详细资料

MetaTable

protected MetaTable(Schema schema,
                    int id,
                    int type)

Create a new metadata table.

参数:

schema - the schema

id - the object id

type - the meta table type

方法详细资料

setMetaTableName

protected final void setMetaTableName(String upperName)

column

protected final Column column(String name,
                              TypeInfo type)

Creates a column with the specified name and data type.

参数:

name - the uppercase column name

type - the data type

返回:

the column

getCreateSQL

public final String getCreateSQL()

从类复制的说明: DbObject

Construct the CREATE ... SQL statement for this object.

指定者:

getCreateSQL 在类中 DbObject

返回:

the SQL statement

addIndex

public final Index addIndex(SessionLocal session,
                            String indexName,
                            int indexId,
                            IndexColumn[] cols,
                            int uniqueColumnCount,
                            IndexType indexType,
                            boolean create,
                            String indexComment)

从类复制的说明: Table

Create an index for this table

指定者:

addIndex 在类中 Table

参数:

session - the session

indexName - the name of the index

indexId - the id

cols - the index columns

uniqueColumnCount - the count of unique columns

indexType - the index type

create - whether this is a new index

indexComment - the comment

返回:

the index

identifier

protected final String identifier(String s)

If needed, convert the identifier to lower case.

参数:

s - the identifier to convert

返回:

the converted identifier

checkIndex

protected final boolean checkIndex(SessionLocal session,
                                   String value,
                                   Value indexFrom,
                                   Value indexTo)

Checks index conditions.

参数:

session - the session

value - the value

indexFrom - the lower bound of value, or null

indexTo - the higher bound of value, or null

返回:

whether row should be included into result

hideTable

protected final boolean hideTable(Table table,
                                  SessionLocal session)

Check whether to hide the table. Tables are never hidden in the system session.

参数:

table - the table

session - the session

返回:

whether the table is hidden

generateRows

public abstract ArrayList<Row> generateRows(SessionLocal session,
                                            SearchRow first,
                                            SearchRow last)

Generate the data for the given metadata table using the given first and last row filters.

参数:

session - the session

first - the first row to return

last - the last row to return

返回:

the generated rows

isInsertable

public boolean isInsertable()

从类复制的说明: Table

Returns whether this table is insertable.

覆盖:

isInsertable 在类中 Table

返回:

whether this table is insertable

removeRow

public final void removeRow(SessionLocal session,
                            Row row)

从类复制的说明: Table

Remove a row from the table and all indexes.

指定者:

removeRow 在类中 Table

参数:

session - the session

row - the row

addRow

public final void addRow(SessionLocal session,
                         Row row)

从类复制的说明: Table

Add a row to the table and all indexes.

指定者:

addRow 在类中 Table

参数:

session - the session

row - the row

removeChildrenAndResources

public final void removeChildrenAndResources(SessionLocal session)

从类复制的说明: DbObject

Delete all dependent children objects and resources of this object.

覆盖:

removeChildrenAndResources 在类中 Table

参数:

session - the session

close

public final void close(SessionLocal session)

从类复制的说明: Table

Close the table object and flush changes.

指定者:

close 在类中 Table

参数:

session - the session

add

protected final void add(SessionLocal session,
                         ArrayList<Row> rows,
                         Object... stringsOrValues)

Add a row to a list.

参数:

session - the session

rows - the original row list

stringsOrValues - the values, or strings

checkRename

public final void checkRename()

从类复制的说明: DbObject

Check if renaming is allowed. Does nothing when allowed.

覆盖:

checkRename 在类中 DbObject

checkSupportAlter

public final void checkSupportAlter()

从类复制的说明: Table

Check if this table supports ALTER TABLE.

指定者:

checkSupportAlter 在类中 Table

truncate

public final long truncate(SessionLocal session)

从类复制的说明: Table

Remove all rows from the table and indexes.

指定者:

truncate 在类中 Table

参数:

session - the session

返回:

number of removed rows, possibly including uncommitted rows

getRowCount

public long getRowCount(SessionLocal session)

从类复制的说明: Table

Get the row count for this table.

指定者:

getRowCount 在类中 Table

参数:

session - the session

返回:

the row count

canGetRowCount

public boolean canGetRowCount(SessionLocal session)

从类复制的说明: Table

Check if the row count can be retrieved quickly.

指定者:

canGetRowCount 在类中 Table

参数:

session - the session

返回:

true if it can

canDrop

public final boolean canDrop()

从类复制的说明: Table

Check if this table can be dropped.

指定者:

canDrop 在类中 Table

返回:

true if it can

getTableType

public final TableType getTableType()

从类复制的说明: Table

Get the table type name

指定者:

getTableType 在类中 Table

返回:

the table type name

getScanIndex

public final Index getScanIndex(SessionLocal session)

从类复制的说明: Table

Get the scan index to iterate through all rows.

指定者:

getScanIndex 在类中 Table

参数:

session - the session

返回:

the index

getIndexes

public final ArrayList<Index> getIndexes()

从类复制的说明: Table

Get all indexes for this table.

指定者:

getIndexes 在类中 Table

返回:

the list of indexes

getRowCountApproximation

public long getRowCountApproximation(SessionLocal session)

从类复制的说明: Table

Get the approximated row count for this table.

指定者:

getRowCountApproximation 在类中 Table

参数:

session - the session

返回:

the approximated row count

isDeterministic

public final boolean isDeterministic()

从类复制的说明: Table

Check if the table is deterministic.

指定者:

isDeterministic 在类中 Table

返回:

true if it is

canReference

public final boolean canReference()

从类复制的说明: Table

Check if this table can be referenced.

覆盖:

canReference 在类中 Table

返回:

true if it can