How to see all the tables in an HSQLDB database?
Question
I usually use SQLDeveloper to browse the database, but I couldn't make it work with HSQLDB and I don't know which tables are already created… I guess it's a vendor-specific question and not plain SQL, but the point is: how can I see the tables so I can drop/alter them?
Solution
The ANSI SQL92 standard for querying database metadata is contained within the INFORMATION_SCHEMA
data structures.
I have no idea whether your database supports this or not, but try the following:
SELECT *
FROM INFORMATION_SCHEMA.TABLES
On further research, it appears that HSQLDB does support INFORMATION_SCHEMA
, but with slightly non-standard naming.
All of the tables have SYSTEM_*
prepended to them, so the above example would read
SELECT *
FROM INFORMATION_SCHEMA.SYSTEM_TABLES
I have no means of testing this, and the answer was found on sourceforge.
OTHER TIPS
Awesome, thanks! Been scouring the Web for that info. This will fetch only your tables' field info:
SELECT TABLE_NAME, COLUMN_NAME, TYPE_NAME, COLUMN_SIZE, DECIMAL_DIGITS, IS_NULLABLE FROM INFORMATION_SCHEMA.SYSTEM_COLUMNS WHERE TABLE_NAME NOT LIKE 'SYSTEM_%'
You can retrieve indexes, primary key info, all kinds of stuff from INFORMATION_SCHEMA.SYSTEM_TABLES
.
Gotta love oo documentation :p
If you're on the command line, you may want to try the Hsqldb SqlTool, documented in the SqlTool Manual (hsqldb.org).
- Put your database connection information in "
~/sqltool.rc
" and choose any DBNAME you want, substitute correct username and password, if known.urlid DBNAME
url jdbc:hsqldb:/path/to/hsql/database
- username SA
- password
- Install tool with:
apt-get install hsqldb-utils
(on Ubuntu) - Connect with
hsqldb-sqltool DBNAME
# on Ubuntu - Hint for other systems:
java -jar YourHsqlJar.jar DBNAME
- Show tables with:
\dt
- Show columns with: \d TABLENAME
- Standard queries like:
SELECT * FROM …;
- Edit (append) last command with:
:a
- Quit with:
\q
- View special commands with:
\?
OR:?
Good luck!
Use the \dt
command when you hit the >sql
prompt in the command line for HSQLDB.
Check out DBVisualiser and SQuirreL SQL Client. Both of these have support for HSQLDB, and a GUI for editing/modifying/viewing the tables.
You run querying using hsql database manager
, are you?
If you use this, below may give some hints:
Select your connection:
- type:
HSQL DATABASE ENGINE SERVER
- Driver:
jdbc.hsqldb.jdbcDriver
- URL:
jdbc:hsqldb:hsql://localhost/
Then, you will browse the database.