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JDBC

JDBC. JDBC Drivers. JDBC is an alternative to ODBC and ADO that provides database access to programs written in Java. Java Servlet and Applet. An applet is a compiled, machine-independent, Java bytecode program that is transmitted to a browser via HTTP and is invoked using the HTTP protocol

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JDBC

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  1. JDBC

  2. JDBC Drivers • JDBC is an alternative to ODBC and ADO that provides database access to programs written in Java

  3. Java Servlet and Applet • An applet is a compiled, machine-independent, Java bytecode program that is transmitted to a browser via HTTP and is invoked using the HTTP protocol • A servlet is a Java program that is invoked on the server to respond to HTTP requests • Type 3 and Type 4 drivers can be used for both applets and servlets • Type 2 drivers can be used only in servlets

  4. JDBC Components

  5. Using JDBC 1. Load the driver • The driver class libraries need to be in the CLASSPATH for the Java compiler and for the Java virtual machine • Class.forName(string).newInstance(); 2. Establish a connection to the database • Connection conn = DriverManager.getConnection(string); • A connection string includes the literal jdbc:, followed by the name of the driver and a URL to the database

  6. Using JDBC (cont.) 3. Create a statement • Statement stmt = conn.createStatement(); 4. Execute the statement • ResultSet rs = stmt.executeQuery(querystring); • Int result = stmt.executeUpdate(updatestring); • ResultSetMetaData rsMeta = rs.getMetaData(); • Both compiled queries and stored procedures can be processed via JDBC using PreparedStatement and CallableStatement objects

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