Java finally key word

使用finally关键词去关闭数据库连接

public void addStudent(Student theStudent) throws Exception {

        Connection myConn = null;
        PreparedStatement myStmt = null;
        
        try {
            // get db connection
            myConn = dataSource.getConnection();
            
            // create sql for insert
            String sql = "insert into student "
                       + "(first_name, last_name, email) "
                       + "values (?, ?, ?)";
            
            myStmt = myConn.prepareStatement(sql);
            
            // set the param values for the student
            myStmt.setString(1, theStudent.getFirstName());
            myStmt.setString(2, theStudent.getLastName());
            myStmt.setString(3, theStudent.getEmail());
            
            // execute sql insert
            myStmt.execute();
        }
        finally {
            // clean up JDBC objects
            close(myConn, myStmt, null);
        }
    }

private void close(Connection myConn, Statement myStmt, ResultSet myRs) {

        try {
            if (myRs != null) {
                myRs.close();
            }
            
            if (myStmt != null) {
                myStmt.close();
            }
            
            if (myConn != null) {
                myConn.close();   // doesn't really close it ... just puts back in connection pool
            }
        }
        catch (Exception exc) {
            exc.printStackTrace();
        }
    }