import java.sql.*;

public class HelloJava {
    public static void main(String[] args) {
        OracleLink();
    }

    public static void OracleLink() {
        Connection con = null; //創建數據庫連接
        PreparedStatement pre = null; //創建預編譯語句對象
        ResultSet result = null; //創建結果集對象
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver"); //加載oracle驅動程序
            System.out.println("正在連接數據庫！");
            String url = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";
            String user = "scott";
            String password = "scott";
            con = DriverManager.getConnection(url, user, password);
            System.out.println("連接成功！");
            // 查詢
            String sql = "SELECT * FROM test where name=?";  //?代表參數
            pre = con.prepareStatement(sql);  //實例化預編譯語句
            pre.setString(1,"張三"); //1表示參數索引
            result = pre.executeQuery();
            while (result.next()) {
                System.out.println("結果為：" + result.getString("NAME"));
            }
            // 插入
            // String sql="insert into ... values()";
            // pre=con.prepareStatement(sql);
            // pre.execute();
            // con.commit();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                                //關閉對象，最后使用的最先關閉
                if (result != null)
                    result.close();
                if (pre != null)
                    pre.close();
                if (con != null)
                    con.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}