What is JDBC?
By: Sun in JDBC Tutorials on 2007-03-15
The JDBC API is a Java API that can access any kind of tabular data, especially data stored in a Relational Database.
JDBC helps you to write java applications that manage these three programming activities:
- Connect to a data source, like a database
- Send queries and update statements to the database
- Retrieve and process the results received from the database in answer to
your query
The following simple code fragment gives a simple example of these three steps:
Connection con = DriverManager.getConnection ( "jdbc:myDriver:wombat", "myLogin","myPassword"); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM Table1"); while (rs.next()) { int x = rs.getInt("a"); String s = rs.getString("b"); float f = rs.getFloat("c"); }
This short code fragment instantiates aDriverManagerobject to connect to a database driver and log into the database, instantiates aStatementobject that carries your SQL language query to the database; instantiates aResultSetobject that retrieves the results of your query, and executes a simplewhileloop, which retrieves and displays those results. It's that simple.
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