"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 Java DB package. You can use "ij" to run any SQL statements on the Java DB server. "ij" uses the JDBC driver to connect to the Java DB server with the "connect" command in this format:

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

connect 'jdbc:derby://<host>:<port>/<database>;create=true';
   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 10.15

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, lib\javadb\databases\ or lib/javadb/databases, I see a sub-directory called, "TestDB", which represents the database instance I created with the "connect" command.

Cool. Now I have the Java DB server running, and I know how to run SQL statements to store and query data with the "ij" tool.

Table of Contents

 About This Book

 JDBC (Java Database Connectivity) Introduction

 JDK (Java SE) Installation

Installing and Running Java DB - Derby

 Downloading and Installing Java DB (Derby)

 Java DB (Derby) in the JDK 1.8 Package

 Downloading Java DB (Derby) Documents

 "sysinfo" - Checking Java DB (Derby) Installation

 Setting Up Java DB (Derby) in Network Server

"ij" - Client Tool to Create New Databases

 Derby (Java DB) JDBC Driver

 Derby (Java DB) JDBC DataSource Objects

 Java DB (Derby) - DML Statements

 Java DB (Derby) - ResultSet Objects of Queries

 Java DB (Derby) - PreparedStatement

 Summary of JDBC Drivers and Database Servers

 Using Connection Pool with JDBC

 Archived Tutorials

 References

 Full Version in PDF/EPUB