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zTable is a mini-DBMS written in Java. It has 2 parts: a back-end DBMS engine and a front-end Eclipse editor plugin. The engine can be embeded in any Java application. The Eclipse editor can be useful as a free DBMS for end-users.
DiskCat is a program designed to help you maintain and organize all the data stored in your removable disks, like CDs and DVDs. It is beeing written in Java, so it is multiplatform and, as it uses JDBC, it can work with your preferred database server.
ViennaSQL is a GUI SQL client written in 100% Java. ViennaSQL can communicate with any database that has a JDBC driver. It should run anywhere Java runs.
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jDBA is database administration tool being written in Java. It will be able to manage multiple instances from a variety of DBMS such as Oracle, Informix, Sybase, MySQL, and others. Development is currently focused solely on Oracle.
Provides a uniform web-based interface to different Relational Database Management Systems. Written in Java with JSP's and servlets. Based on phpMyAdmin's interface.
DISCONTINUED PROJECT (see news) - jConsole is essentially a management console (written in Java) that can have a variety of plugins attached to it. At the moment it is growing as a framework for a cross database maintenance / query tool (SQL).
Transact-SQL Analyzer is a java-based client tool for Microsoft (MS) SQL Server. It is written in Java, so SQL Server client tool provides access to microsoft SQL Server from any platform with a Java VM installed.
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A console-based (Swing gui also in the future ...) interactive db query tool written in Java/JDBC. It goes beyond the typical tools by introducing a SQL-like metadata query language that allows interactive querying of DatabaseMetaData and ResultSetMetaDa
A Java project implementing an application that allows users to search for data on movies and actors. This appliaction is written as a part of a course on database in Tel Aviv university.
SQLMerger is an Open Source visual SQL differencing and merging tool written in Java. It is highly useful for determing what has changed between differents tables, and then merging changes between them.