Database 对现有数据库使用derby ij
虽然我有,但我确实取得了部分成功:Database 对现有数据库使用derby ij,database,ubuntu,command-line-interface,derby,Database,Ubuntu,Command Line Interface,Derby,虽然我有,但我确实取得了部分成功: root@dur:~/apache-james-3.0-beta4/var/store/derby# root@dur:~/apache-james-3.0-beta4/var/store/derby# ll total 36 drwxr-xr-x 5 root root 4096 Aug 23 16:46 ./ drwxr-xr-x 5 501 staff 4096 Aug 23 02:07 ../ -rw-r--r-- 1 root root
root@dur:~/apache-james-3.0-beta4/var/store/derby#
root@dur:~/apache-james-3.0-beta4/var/store/derby# ll
total 36
drwxr-xr-x 5 root root 4096 Aug 23 16:46 ./
drwxr-xr-x 5 501 staff 4096 Aug 23 02:07 ../
-rw-r--r-- 1 root root 4 Aug 23 02:07 dbex.lck
-rw-r--r-- 1 root root 38 Aug 23 02:07 db.lck
-rw-r--r-- 1 root root 187 Aug 23 16:46 derby.log
drwxr-xr-x 2 root root 4096 Aug 23 02:07 log/
drwxr-xr-x 2 root root 4096 Aug 23 02:07 seg0/
-rw-r--r-- 1 root root 868 Aug 23 02:07 service.properties
drwxr-xr-x 2 root root 4096 Aug 23 02:07 tmp/
root@dur:~/apache-james-3.0-beta4/var/store/derby#
root@dur:~/apache-james-3.0-beta4/var/store/derby# java org.apache.derby.tools.ij
ij version 10.9
ij> quit;
root@dur:~/apache-james-3.0-beta4/var/store/derby#
现在如何查询这个特定的数据库?我仍然不知道如何真正查询数据库本身,但连接起来相当简单:
一个完整的示例,使用Derby和Squirrel,假设系统上已经安装了Derby数据库:
$HOME/bin/squirrel
$HOME/bin/db derby
cd$HOME/bin/Squirrel;/squirrelsql.sh
)$DERBY_HOME/lib/DERBY.jar
seg0
的目录)seg0
的目录SELECT*FROM SYS.SYSTABLES
注意:从技术上讲,这并不能回答这个问题,因为这个答案没有解释如何使用交互式命令行界面(
ij
)。答案为使用Squirrel图形界面查询数据库提供了一个可行的替代方案。一个示例查询是:从app.james_邮箱中选择*;
root@dur:~/apache-james-3.0-beta4/var/store/derby#
root@dur:~/apache-james-3.0-beta4/var/store/derby# pwd
/root/apache-james-3.0-beta4/var/store/derby
root@dur:~/apache-james-3.0-beta4/var/store/derby#
root@dur:~/apache-james-3.0-beta4/var/store/derby# ll
total 24
drwxr-xr-x 4 root root 4096 Aug 23 18:24 ./
drwxr-xr-x 5 501 staff 4096 Aug 23 02:07 ../
-rw-r--r-- 1 root root 1092 Aug 23 18:24 derby.log
drwxr-xr-x 2 root root 4096 Aug 23 02:07 log/
drwxr-xr-x 2 root root 4096 Aug 23 02:07 seg0/
-rw-r--r-- 1 root root 868 Aug 23 02:07 service.properties
root@dur:~/apache-james-3.0-beta4/var/store/derby#
root@dur:~/apache-james-3.0-beta4/var/store/derby# java org.apache.derby.tools.ij
ij version 10.9
ij> connect 'jdbc:derby:/root/apache-james-3.0-beta4/var/store/derby';
ij>
;
ij> show schema;
ERROR 42X01: Syntax error: Encountered "show" at line 1, column 1.
Issue the 'help' command for general information on IJ command syntax.
Any unrecognized commands are treated as potential SQL commands and executed directly.
Consult your DBMS server reference documentation for details of the SQL syntax supported by your server.
ij>
;
ij> show schemas;
TABLE_SCHEM
------------------------------
APP
NULLID
SQLJ
SYS
SYSCAT
SYSCS_DIAG
SYSCS_UTIL
SYSFUN
SYSIBM
SYSPROC
SYSSTAT
11 rows selected
ij> show tables;
TABLE_SCHEM |TABLE_NAME |REMARKS
------------------------------------------------------------------------
SYS |SYSALIASES |
SYS |SYSCHECKS |
SYS |SYSCOLPERMS |
SYS |SYSCOLUMNS |
SYS |SYSCONGLOMERATES |
SYS |SYSCONSTRAINTS |
SYS |SYSDEPENDS |
SYS |SYSFILES |
SYS |SYSFOREIGNKEYS |
SYS |SYSKEYS |
SYS |SYSPERMS |
SYS |SYSROLES |
SYS |SYSROUTINEPERMS |
SYS |SYSSCHEMAS |
SYS |SYSSEQUENCES |
SYS |SYSSTATEMENTS |
SYS |SYSSTATISTICS |
SYS |SYSTABLEPERMS |
SYS |SYSTABLES |
SYS |SYSTRIGGERS |
SYS |SYSVIEWS |
SYSIBM |SYSDUMMY1 |
APP |JAMES_DOMAIN |
APP |JAMES_MAIL |
APP |JAMES_MAILBOX |
APP |JAMES_MAIL_PROPERTY |
APP |JAMES_MAIL_USERFLAG |
APP |JAMES_RECIPIENT_REWRITE |
APP |JAMES_SUBSCRIPTION |
APP |JAMES_USER |
APP |OPENJPA_SEQUENCE_TABLE |
31 rows selected
ij> quit;
root@dur:~/apache-james-3.0-beta4/var/store/derby#