Delete all tables in Derby DB

Question

How do i delete all the tables in the schema on Apache Derby DB using JDBC?

Answer 1

If you're working from the command prompt rather than through JDBC, this should get you started.

SELECT 'DROP TABLE ' || schemaname ||'.' || tablename || ';'
FROM SYS.SYSTABLES
INNER JOIN SYS.SYSSCHEMAS ON SYS.SYSTABLES.SCHEMAID = SYS.SYSSCHEMAS.SCHEMAID
;

Answer 2

I think most db providers don't allow DROP TABLE * (or similar).

I think the best way would be to SHOW TABLES and then go through each deleting in a loop via a resultset.

HTH.

Answer 3

Download Squirrel SQL from http://squirrel-sql.sourceforge.net/

Connect to the database.

Expand the TABLE node.

Select the tables that you want to drop.

Right click and select -> Scripts -> Drop table scripts

Run the generated queries

You can even select delete records to empty the selected tables.

Answer 4

Do a little method in java in which you execute a

DROP TABLE [tablename]

tablename is passed by parameter.

And another method in which you loop over a record set formed by the query

SELECT tablename FROM SYSTABLES

calling the first method.

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