"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.

Cool. Now I have the Derby 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 Derby (Java DB)

 Downloading and Installing Derby (Java DB)

 Derby (Java DB) in the JDK 1.8 Package

 Downloading Derby (Java DB) Documents

 "sysinfo" - Checking Derby (Java DB) Installation

 Setting Up Derby (Java DB) in Network Server

"ij" - Client Tool to Create New Databases

 Derby (Java DB) JDBC Driver

 Derby (Java DB) JDBC DataSource Objects

 Derby (Java DB) - DML Statements

 Derby (Java DB) - ResultSet Objects of Queries

 Derby (Java DB) - PreparedStatement

 Summary of JDBC Drivers and Database Servers

 Using Connection Pool with JDBC

 Archived Tutorials


 Full Version in PDF/EPUB