MetaTable (H2 Database Engine wt-1.0.1 API)

java.lang.Object
- org.h2.engine.DbObjectBase
- - org.h2.schema.SchemaObjectBase
  - - org.h2.table.Table
    - - org.h2.table.MetaTable

所有已实现的接口:

DbObject, SchemaObject
```
public 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

static long ROW_COUNT_APPROXIMATION
The approximate number of rows of a meta table.
- 从类继承的字段 org.h2.table.Table
  columns, compareMode, isHidden, TYPE_CACHED, TYPE_MEMORY
- 从类继承的字段 org.h2.engine.DbObjectBase
  comment, database, trace
- 从接口继承的字段 org.h2.engine.DbObject
  AGGREGATE, COMMENT, CONSTANT, CONSTRAINT, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, TABLE_OR_VIEW, TRIGGER, USER, USER_DATATYPE

字段
限定符和类型	字段和说明
`static long`	`ROW_COUNT_APPROXIMATION` The approximate number of rows of a meta table.

构造器概要

构造器
构造器和说明

MetaTable(Schema schema, int id, int type)
Create a new metadata table.

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

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法和说明
`Index`	`addIndex(Session session, String indexName, int indexId, IndexColumn[] cols, IndexType indexType, boolean create, String indexComment)` Create an index for this table
`void`	`addRow(Session session, Row row)` Add a row to the table and all indexes.
`boolean`	`canDrop()` Check if this table can be dropped.
`boolean`	`canGetRowCount()` Check if the row count can be retrieved quickly.
`boolean`	`canReference()` Check if this table can be referenced.
`void`	`checkRename()` Check if this object can be renamed.
`void`	`checkSupportAlter()` Check if this table supports ALTER TABLE.
`void`	`close(Session session)` Close the table object and flush changes.
`ArrayList<Row>`	`generateRows(Session session, SearchRow first, SearchRow last)` Generate the data for the given metadata table using the given first and last row filters.
`String`	`getCreateSQL()` Build a SQL statement to re-create this object.
`long`	`getDiskSpaceUsed()`
`String`	`getDropSQL()` Build a SQL statement to drop this object.
`ArrayList<Index>`	`getIndexes()` Get all indexes for this table.
`long`	`getMaxDataModificationId()` Get the last data modification id.
`static int`	`getMetaTableTypeCount()` Get the number of meta table types.
`long`	`getRowCount(Session session)` Get the row count for this table.
`long`	`getRowCountApproximation()` Get the approximated row count for this table.
`Index`	`getScanIndex(Session session)` Get the scan index to iterate through all rows.
`TableType`	`getTableType()` Get the table type name
`Index`	`getUniqueIndex()` Get any unique index for this table if one exists.
`boolean`	`isDeterministic()` Check if the table is deterministic.
`boolean`	`isLockedExclusively()` Check if this table is locked exclusively.
`boolean`	`lock(Session session, boolean exclusive, boolean forceLockEvenInMvcc)` Lock the table for the given session.
`void`	`removeChildrenAndResources(Session session)` Remove all dependent objects and free all resources (files, blocks in files) of this object.
`void`	`removeRow(Session session, Row row)` Remove a row from the table and all indexes.
`void`	`truncate(Session session)` Remove all rows from the table and indexes.
`void`	`unlock(Session s)` Release the lock for this session.

从类继承的方法 org.h2.table.Table
addConstraint, addDependencies, addSequence, addTrigger, addView, canTruncate, checkDeadlock, checkWritingAllowed, commit, compareTypeSafe, doesColumnExist, dropMultipleColumnsConstraintsAndIndexes, findPrimaryKey, fire, fireAfterRow, fireBeforeRow, fireRow, getBestPlanItem, getCheckForeignKeyConstraints, getChildren, getColumn, getColumn, getColumns, getCompareMode, getConstraints, getCreateSQLForCopy, getDefaultValue, getIndexForColumn, getOnCommitDrop, getOnCommitTruncate, getPrimaryKey, getRow, getRowIdColumn, getScanIndex, getTemplateRow, getTemplateSimpleRow, getType, getViews, hasSelectTrigger, isGlobalTemporary, isHidden, isLockedExclusivelyBy, isMVStore, isPersistData, isPersistIndexes, isQueryComparable, isView, removeConstraint, removeIndex, removeIndexOrTransferOwnership, removeSequence, removeTrigger, removeView, rename, renameColumn, setCheckForeignKeyConstraints, setColumns, setHidden, setOnCommitDrop, setOnCommitTruncate, updateRows, validateConvertUpdateSequence

从类继承的方法 org.h2.schema.SchemaObjectBase
getSchema, getSQL, initSchemaObjectBase

从类继承的方法 org.h2.engine.DbObjectBase
getComment, getDatabase, getId, getModificationId, getName, initDbObjectBase, 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.engine.DbObject
getComment, getDatabase, getId, getName, isTemporary, setComment, setTemporary

- 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
- 构造器详细资料
  - MetaTable
```
public 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
  - getDropSQL
```
public String getDropSQL()
```
    从类复制的说明: DbObjectBase
    
    Build a SQL statement to drop this object.
    
    指定者:
    
    getDropSQL 在接口中 DbObject
    
    指定者:
    
    getDropSQL 在类中 DbObjectBase
    
    返回:
    
    the SQL statement
  - getCreateSQL
```
public String getCreateSQL()
```
    从类复制的说明: DbObjectBase
    
    Build a SQL statement to re-create this object.
    
    指定者:
    
    getCreateSQL 在接口中 DbObject
    
    指定者:
    
    getCreateSQL 在类中 DbObjectBase
    
    返回:
    
    the SQL statement
  - addIndex
```
public Index addIndex(Session session,
                      String indexName,
                      int indexId,
                      IndexColumn[] cols,
                      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
    
    indexType - the index type
    
    create - whether this is a new index
    
    indexComment - the comment
    
    返回:
    
    the index
  - lock
```
public boolean lock(Session session,
                    boolean exclusive,
                    boolean forceLockEvenInMvcc)
```
    从类复制的说明: Table
    
    Lock the table for the given session. This method waits until the lock is granted.
    
    指定者:
    
    lock 在类中 Table
    
    参数:
    
    session - the session
    
    exclusive - true for write locks, false for read locks
    
    forceLockEvenInMvcc - lock even in the MVCC mode
    
    返回:
    
    true if the table was already exclusively locked by this session.
  - isLockedExclusively
```
public boolean isLockedExclusively()
```
    从类复制的说明: Table
    
    Check if this table is locked exclusively.
    
    指定者:
    
    isLockedExclusively 在类中 Table
    
    返回:
    
    true if it is.
  - generateRows
```
public ArrayList<Row> generateRows(Session 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
  - removeRow
```
public void removeRow(Session 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 void addRow(Session 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 void removeChildrenAndResources(Session session)
```
    从类复制的说明: DbObjectBase
    
    Remove all dependent objects and free all resources (files, blocks in files) of this object.
    
    指定者:
    
    removeChildrenAndResources 在接口中 DbObject
    
    覆盖:
    
    removeChildrenAndResources 在类中 Table
    
    参数:
    
    session - the session
  - close
```
public void close(Session 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
  - unlock
```
public void unlock(Session s)
```
    从类复制的说明: Table
    
    Release the lock for this session.
    
    指定者:
    
    unlock 在类中 Table
    
    参数:
    
    s - the session
  - checkRename
```
public void checkRename()
```
    从类复制的说明: DbObjectBase
    
    Check if this object can be renamed. System objects may not be renamed.
    
    指定者:
    
    checkRename 在接口中 DbObject
    
    指定者:
    
    checkRename 在类中 DbObjectBase
  - checkSupportAlter
```
public 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 void truncate(Session 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
  - getRowCount
```
public long getRowCount(Session 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()
```
    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
    
    返回:
    
    true if it can
  - canDrop
```
public 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 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 Index getScanIndex(Session 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 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
  - getMaxDataModificationId
```
public long getMaxDataModificationId()
```
    从类复制的说明: Table
    
    Get the last data modification id.
    
    指定者:
    
    getMaxDataModificationId 在类中 Table
    
    返回:
    
    the modification id
  - getUniqueIndex
```
public Index getUniqueIndex()
```
    从类复制的说明: Table
    
    Get any unique index for this table if one exists.
    
    指定者:
    
    getUniqueIndex 在类中 Table
    
    返回:
    
    a unique index
  - getMetaTableTypeCount
```
public static int getMetaTableTypeCount()
```
    Get the number of meta table types. Supported meta table types are 0 .. this value - 1.
    
    返回:
    
    the number of meta table types
  - getRowCountApproximation
```
public long getRowCountApproximation()
```
    从类复制的说明: Table
    
    Get the approximated row count for this table.
    
    指定者:
    
    getRowCountApproximation 在类中 Table
    
    返回:
    
    the approximated row count
  - getDiskSpaceUsed
```
public long getDiskSpaceUsed()
```
    指定者:
    
    getDiskSpaceUsed 在类中 Table
  - isDeterministic
```
public 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 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

类 MetaTable

字段概要

从类继承的字段 org.h2.table.Table

从类继承的字段 org.h2.engine.DbObjectBase

从接口继承的字段 org.h2.engine.DbObject

构造器概要

方法概要

从类继承的方法 org.h2.table.Table

从类继承的方法 org.h2.schema.SchemaObjectBase

从类继承的方法 org.h2.engine.DbObjectBase

从类继承的方法 java.lang.Object

从接口继承的方法 org.h2.engine.DbObject

字段详细资料

ROW_COUNT_APPROXIMATION

构造器详细资料

MetaTable

方法详细资料

getDropSQL

getCreateSQL

addIndex

lock

isLockedExclusively

generateRows

removeRow

addRow

removeChildrenAndResources

close

unlock

checkRename

checkSupportAlter

truncate

getRowCount

canGetRowCount

canDrop

getTableType

getScanIndex

getIndexes

getMaxDataModificationId

getUniqueIndex

getMetaTableTypeCount

getRowCountApproximation

getDiskSpaceUsed

isDeterministic

canReference