Apache Derby - 工具

Apache Derby 为您提供了 sysinfo、ij 和 dblook 等工具。

sysinfo 工具

使用该工具，您可以获得有关Java和Derby环境的信息。

浏览Derby安装目录的bin文件夹，执行sysinfo命令，如下所示 −

C:UsersMY_USER>cd %DERBY_HOME%/bin
C:Derby\bin>sysinfo

执行时，它会为您提供有关 java 和 derby 的系统信息，如下所示 −

------------------ Java Information ------------------
Java Version: 1.8.0_101
Java Vendor: Oracle Corporation
Java home: C:Program FilesJavajdk1.8.0_101jre
Java classpath: C:UsersTutorialspointGoogle
DriveOfficeDerbyderby_zipNew folderdb-derby-10.12.1.1-
binlib;C:EXAMPLES_Taskjars*;C:EXAMPLESjarsmysql-connector-java-5.1.40-
bin.jar;C:UsersTutorialspointGoogle DriveOffice37.Junit
Updatejars;C:Program FilesApache Software FoundationTomcat
8.5lib*;C:Derbylibderby.jar;C:Derbylibderbyclient.jar;C:Derbylibderb
yLocale_cs.jar;C:DerbylibderbyLocale_de_DE.jar;C:DerbylibderbyLocale_es.j
ar;C:DerbylibderbyLocale_fr.jar;C:DerbylibderbyLocale_hu.jar;C:Derbylib
derbyLocale_it.jar;C:DerbylibderbyLocale_ja_JP.jar;C:DerbylibderbyLocale
_ko_KR.jar;C:DerbylibderbyLocale_pl.jar;C:DerbylibderbyLocale_pt_BR.jar;C
:DerbylibderbyLocale_ru.jar;C:DerbylibderbyLocale_zh_CN.jar;C:Derbylib
derbyLocale_zh_TW.jar;C:Derbylibderbynet.jar;C:Derbylibderbyoptionaltools
.jar;C:Derbylibderbyrun.jar;C:Derbylibderbytools.jar;;C:Derby/lib/derby.
jar;C:Derby/lib/derbynet.jar;C:Derby/lib/derbyclient.jar;C:Derby/lib/derbyto
ols.jar;C:Derby/lib/derbyoptionaltools.jar
OS name: Windows 10
OS architecture: amd64
OS version: 10.0
Java user name: Tutorialspoint
Java user home: C:UsersTutorialspoint
Java user dir: C:Derby\bin
java.specification.name: Java Platform API Specification
java.specification.version: 1.8
java.runtime.version: 1.8.0_101-b13
--------- Derby Information --------
[C:Derbylibderby.jar] 10.14.2.0 - (1828579)
[C:Derbylibderbytools.jar] 10.14.2.0 - (1828579)
[C:Derbylibderbynet.jar] 10.14.2.0 - (1828579)
[C:Derbylibderbyclient.jar] 10.14.2.0 - (1828579)
[C:Derbylibderbyoptionaltools.jar] 10.14.2.0 - (1828579)
------------------------------------------------------
----------------- Locale Information -----------------
Current Locale : [English/United States [en_US]]
Found support for locale: [cs]
 version: 10.14.2.0 - (1828579)
Found support for locale: [de_DE]
 version: 10.14.2.0 - (1828579)
Found support for locale: [es]
 version: 10.14.2.0 - (1828579)
Found support for locale: [fr]
 version: 10.14.2.0 - (1828579)
Found support for locale: [hu]
 version: 10.14.2.0 - (1828579)
Found support for locale: [it]
 version: 10.14.2.0 - (1828579)
Found support for locale: [ja_JP]
 version: 10.14.2.0 - (1828579)
Found support for locale: [ko_KR]
 version: 10.14.2.0 - (1828579)
Found support for locale: [pl]
 version: 10.14.2.0 - (1828579)
Found support for locale: [pt_BR]
 version: 10.14.2.0 - (1828579)
Found support for locale: [ru]
 version: 10.14.2.0 - (1828579)
Found support for locale: [zh_CN]
 version: 10.14.2.0 - (1828579)
Found support for locale: [zh_TW]
 version: 10.14.2.0 - (1828579)
------------------------------------------------------
------------------------------------------------------

ijtool

使用此工具，您可以运行 apache Derby 的脚本和查询。

浏览Derby安装目录的bin文件夹，执行ij命令如下 −

C:UsersMY_USER>cd %DERBY_HOME%/bin
C:Derby\bin>ij

这将为您提供 ij shell，您可以在其中执行 derby 命令和脚本，如下所示 −

ij version 10.14
ij>

使用help命令，您可以获得该shell支持的命令列表。

C:Derby\bin>cd %DERBY_HOME%/bin
C:Derby\bin>ij
ij version 10.14
ij> help;
Supported commands include:
 PROTOCOL 'JDBC protocol' [ AS ident ];
 -- sets a default or named protocol
 DRIVER 'class for driver'; -- loads the named class
 CONNECT 'url for database' [ PROTOCOL namedProtocol ] [ AS connectionName ];
 -- connects to database URL
 -- and may assign identifier
 SET CONNECTION connectionName; -- switches to the specified connection
 SHOW CONNECTIONS; -- lists all connections
 AUTOCOMMIT [ ON | OFF ]; -- sets autocommit mode for the connection
 DISCONNECT [ CURRENT | connectionName | ALL ];
 -- drop current, named, or all connections;
-- the default is CURRENT
 SHOW SCHEMAS; -- lists all schemas in the current database
 SHOW [ TABLES | VIEWS | PROCEDURES | FUNCTIONS | SYNONYMS ] { IN schema };
 -- lists tables, views, procedures, functions or
synonyms
 SHOW INDEXES { IN schema | FROM table };
 -- lists indexes in a schema, or for a table
 SHOW ROLES; -- lists all defined roles in the database,
sorted
 SHOW ENABLED_ROLES; -- lists the enabled roles for the current
 -- connection (to see current role use
 -- VALUES CURRENT_ROLE), sorted
 SHOW SETTABLE_ROLES; -- lists the roles which can be set for the
 -- current connection, sorted
 DESCRIBE name; -- lists columns in the named table
 COMMIT; -- commits the current transaction
 ROLLBACK; -- rolls back the current transaction
 PREPARE name AS 'SQL-J text'; -- prepares the SQL-J text
 EXECUTE { name | 'SQL-J text' } [ USING { name | 'SQL-J text' } ] ;
 -- executes the statement with parameter
-- values from the USING result set row
 REMOVE name; -- removes the named previously prepared
statement
 RUN 'filename'; -- run commands from the named file
 ELAPSEDTIME [ ON | OFF ]; -- sets elapsed time mode for ij
 MAXIMUMDISPLAYWIDTH integerValue;
 -- sets the maximum display width for
-- each column to integerValue
 ASYNC name 'SQL-J text'; -- run the command in another thread
 WAIT FOR name; -- wait for result of ASYNC'd command
 HOLDFORCONNECTION; -- sets holdability for a connection to HOLD
 -- (i.e. ResultSet.HOLD_CURSORS_OVER_COMMIT)
 NOHOLDFORCONNECTION; -- sets holdability for a connection to NO HOLD
 -- (i.e. ResultSet.CLOSE_CURSORS_AT_COMMIT)
 GET [SCROLL INSENSITIVE] [WITH { HOLD | NOHOLD }] CURSOR name AS 'SQL-J
query';
 -- gets a cursor (JDBC result set) on the query
-- the default is a forward-only cursor with
holdability
 NEXT name; -- gets the next row from the named cursor
 FIRST name; -- gets the first row from the named scroll
cursor
 LAST name; -- gets the last row from the named scroll
cursor
 PREVIOUS name; -- gets the previous row from the named scroll
cursor
 ABSOLUTE integer name; -- positions the named scroll cursor at the
absolute row number
 -- (A negative number denotes position from the
last row.)
 RELATIVE integer name; -- positions the named scroll cursor relative to
the current row
 -- (integer is number of rows)
 AFTER LAST name; -- positions the named scroll cursor after the
last row
 BEFORE FIRST name; -- positions the named scroll cursor before the
first row
 GETCURRENTROWNUMBER name; -- returns the row number for the current
position of the named scroll cursor
 -- (0 is returned when the cursor is not
positioned on a row.)
 CLOSE name; -- closes the named cursor
 LOCALIZEDDISPLAY [ ON | OFF ];
 -- controls locale sensitive data representation
 EXIT; -- exits ij
 HELP; -- shows this message
Any unrecognized commands are treated as potential SQL-J commands and executed
directly.

dblooktool

该工具用于生成数据定义语言。

浏览Derby安装目录的bin文件夹，执行dblook命令，如下所示 −

C:UsersMY_USER>cd %DERBY_HOME%/bin
C:Derby\bin>dblook -d myURL

其中，myURL是需要生成DDL的数据库的连接URL。