EJB QL facts for kids
EJB QL (which stands for Enterprise Java Beans Query Language) is a special computer language. It helps computer programs talk to databases and ask for information. Think of it like asking a librarian for a specific book. EJB QL is used in big computer systems called J2EE applications. It helps these systems find and use data, no matter what kind of database they are connected to.
What is EJB QL?
EJB QL is a type of query language. This means it's a language used to ask questions (or "queries") to a database. It helps computer programs get the exact information they need.
Imagine you have a big collection of digital cards, and each card holds information about something, like a student or a product. EJB QL lets you ask for cards based on what's written on them, or how they are connected to other cards.
How is it Different from SQL?
You might have heard of another query language called SQL. SQL is very common and works directly with tables and columns in a database, like looking at a spreadsheet.
EJB QL is a bit different. Instead of talking about tables, it talks about "enterprise beans." These "beans" are like smart software pieces that hold information and know how they relate to other pieces. So, when you use EJB QL, you're asking about these "beans" and their connections, not directly about the database's rows and columns.
For example, with SQL, you might ask: "Show me all rows from the 'Students' table where the 'Grade' column is 'A'." With EJB QL, you might ask: "Show me all 'Student' beans that have a 'Grade' of 'A'." It's a more object-focused way of asking for data.
Why Use EJB QL?
EJB QL makes it easier for programmers to work with complex systems. It lets them think about the software parts (the "beans") instead of getting caught up in the details of how the database is set up. This helps programs work smoothly across different types of databases.
Related pages
- HQL
- SQL
