SQL
Preventing SQL-Injection in a Java application
Sql-Injection is a technique to inject (or execute) SQL commands within an application (database). It is mainly used to gain access to a databases content for which one has no authorization. The method injects SQL commands by providing input to a SQL statement which contains SQL meta-characters.
Example statement: <strong>select * from user where username='input'</strong>
SQL injected input:<strong>user' OR '1'='1</strong>
The final statement:<strong>select * from user where username='user' OR '1'='1'</strong>
Since 1 always equals 1, this statement would return all the users in the database!
Depending on the SQL command, an attacker could insert, modify, extract and delete data in the database.
Easy access to MySQL data on shared hosting service
<p>MySQL databases are often the main data-source of web applications when it comes to shared hosting services with very limited possibilites (no system service support, no scheduling, no in-memory database, ...). Often, management or visualization of such databases is not easily done, since no admin utility is installed, no remote connections to the database are allowed, and access by the sql binary (via SSH) is not user-friendly. A better way to manage databases visually in such cases is the challenge.</p>
Storing OWL Ontologies in SQL Relational Databases
Relational databases are often used as a basis for persistent storage of ontologies to facilitate rapid operations such as search and retrieval, and to utilize the benefits of relational databases management systems such as transaction management, security and integrity control. On the other hand, there appear more and more OWL files that contain ontologies. Therefore, we need extract ontologies from OWL files and then store them in relational databases. A prerequisite for this storing is transformation of ontologies to relational databases.
Work with RDF
RDF (Resource Description Framework) is a set of specifications, designed to provide metadata for your data model (general method of modelling information). RDF-Files are stored in a XML like syntax and are used to additional describe the data contained. There also exist an SQL-Query like query language which allows you to extract data from these files. However it would be nice to store these files into a database and easily update or read the data.
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