org.h2.tools

类 Recover

java.lang.Object

org.h2.util.Tool

org.h2.tools.Recover

所有已实现的接口:

DataHandler

public class Recover
extends Tool
implements DataHandler

Helps recovering a corrupted database.

字段概要

从类继承的字段 org.h2.util.Tool

out

构造器概要

构造器

构造器和说明
Recover()

方法概要

限定符和类型	方法和说明
void	checkPowerOff() INTERNAL
void	checkWritingAllowed() INTERNAL
static void	execute(String dir, String db) Dumps the contents of a database to a SQL script file.
CompareMode	getCompareMode() Return compare mode.
String	getDatabasePath() INTERNAL
SmallLRUCache<String,String[]>	getLobFileListCache() INTERNAL
LobStorageInterface	getLobStorage() INTERNAL
Object	getLobSyncObject() INTERNAL
int	getMaxLengthInplaceLob() INTERNAL
TempFileDeleter	getTempFileDeleter() INTERNAL
static void	main(String... args) Options are case sensitive.
FileStore	openFile(String name, String mode, boolean mustExist) INTERNAL
static InputStream	readBlobMap(Connection conn, long lobId, long precision) INTERNAL
static Reader	readClobMap(Connection conn, long lobId, long precision) INTERNAL
int	readLob(long lobId, byte[] hmac, long offset, byte[] buff, int off, int length) INTERNAL
void	runTool(String... args) Dumps the contents of a database file to a human readable text file.

从类继承的方法 org.h2.util.Tool

isOption, printNoDatabaseFilesFound, setOut, showUsage, showUsageAndThrowUnsupportedOption, throwUnsupportedOption

从类继承的方法 java.lang.Object

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

构造器详细资料

Recover

public Recover()

方法详细资料

main

public static void main(String... args)
                 throws SQLException

Options are case sensitive.

Supported options

[-help] or [-?]	Print the list of options
[-dir <dir>]	The directory (default: .)
[-db <database>]	The database name (all databases if not set)
[-trace]	Print additional trace information
[-transactionLog]	Print the transaction log

Encrypted databases need to be decrypted first.

参数:

args - the command line arguments

抛出:

SQLException - on failure

runTool

public void runTool(String... args)
             throws SQLException

Dumps the contents of a database file to a human readable text file. This text file can be used to recover most of the data. This tool does not open the database and can be used even if the database files are corrupted. A database can get corrupted if there is a bug in the database engine or file system software, or if an application writes into the database file that doesn't understand the file format, or if there is a hardware problem.

指定者:

runTool 在类中 Tool

参数:

args - the command line arguments

抛出:

SQLException - on failure

readBlobMap

public static InputStream readBlobMap(Connection conn,
                                      long lobId,
                                      long precision)
                               throws SQLException

INTERNAL

参数:

conn - to use

lobId - id of the LOB stream

precision - not used

返回:

InputStream to read LOB content from

抛出:

SQLException - on failure

readClobMap

public static Reader readClobMap(Connection conn,
                                 long lobId,
                                 long precision)
                          throws Exception

INTERNAL

参数:

conn - to use

lobId - id of the LOB stream

precision - not used

返回:

Reader to read LOB content from

抛出:

SQLException - on failure

Exception

execute

public static void execute(String dir,
                           String db)
                    throws SQLException

Dumps the contents of a database to a SQL script file.

参数:

dir - the directory

db - the database name (null for all databases)

抛出:

SQLException - on failure

getDatabasePath

public String getDatabasePath()

INTERNAL

指定者:

getDatabasePath 在接口中 DataHandler

返回:

the database path

openFile

public FileStore openFile(String name,
                          String mode,
                          boolean mustExist)

INTERNAL

指定者:

openFile 在接口中 DataHandler

参数:

name - the file name

mode - the mode

mustExist - whether the file must already exist

返回:

the file

checkPowerOff

public void checkPowerOff()

INTERNAL

指定者:

checkPowerOff 在接口中 DataHandler

checkWritingAllowed

public void checkWritingAllowed()

INTERNAL

指定者:

checkWritingAllowed 在接口中 DataHandler

getMaxLengthInplaceLob

public int getMaxLengthInplaceLob()

INTERNAL

指定者:

getMaxLengthInplaceLob 在接口中 DataHandler

返回:

the maximum size

getLobSyncObject

public Object getLobSyncObject()

INTERNAL

指定者:

getLobSyncObject 在接口中 DataHandler

返回:

the synchronization object

getLobFileListCache

public SmallLRUCache<String,String[]> getLobFileListCache()

INTERNAL

指定者:

getLobFileListCache 在接口中 DataHandler

返回:

the cache or null

getTempFileDeleter

public TempFileDeleter getTempFileDeleter()

INTERNAL

指定者:

getTempFileDeleter 在接口中 DataHandler

返回:

the temp file deleter

getLobStorage

public LobStorageInterface getLobStorage()

INTERNAL

指定者:

getLobStorage 在接口中 DataHandler

返回:

the lob storage mechanism

readLob

public int readLob(long lobId,
                   byte[] hmac,
                   long offset,
                   byte[] buff,
                   int off,
                   int length)

INTERNAL

指定者:

readLob 在接口中 DataHandler

参数:

lobId - the lob id

hmac - the message authentication code

offset - the offset within the lob

buff - the target buffer

off - the offset within the target buffer

length - the number of bytes to read

返回:

the number of bytes read

getCompareMode

public CompareMode getCompareMode()

从接口复制的说明: DataHandler

Return compare mode.

指定者:

getCompareMode 在接口中 DataHandler

返回:

Compare mode.