"ij" - Client Tool to Create New Databases

JDBC Tutorials - Herong's Tutorial Examples

∟"ij" - Client Tool to Create New Databases

This section describes how to use the command line tool 'ij' to create a new database with a new table.

"ij" is a command line client tool included in the Derby package. You can use "ij" to run any SQL statements on the Derby server. "ij" uses the JDBC driver to connect to the Derby server with the "connect" command in this format:

connect 'jdbc:derby://<host>:<port>/<database>;create=true';
   Create a new database and connect to that database

connect 'jdbc:derby://<host>:<port>/<database>';
   Connect to an existing database

Here is how I used "ij" to create a new database and a new table. Open another command line window and run the following commands:

(on Windows)
herong> %DERBY_HOME%\bin\ij

(on Linux or macOS)
herong> $DERBY_HOME/bin/ij
ij version 10.17

ij> connect 'jdbc:derby://localhost/TestDB;create=true';

ij> CREATE TABLE TestTable (ID INT, Name VARCHAR(20));
0 rows inserted/updated/deleted

ij> INSERT INTO TestTable VALUES (1, 'Herong');
1 row inserted/updated/deleted

ij> SELECT * FROM TestTable;
ID         |NAME
--------------------------------
1          |Herong

1 row selected
ij> quit;

When I look at my Derby database directory, local\javadb\databases\ or local/javadb/databases, I see a sub-directory called, "TestDB", which represents the database instance I created with the "connect" command.