Oracle 12c JDBC 连接

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

public class Test {

    private static Connection getConn() {

        String driver = "oracle.jdbc.driver.OracleDriver";

        //String url = "jdbc:oracle:thin:@127.0.0.1:1521:pdbmyoracle";// 设置连接字符串

        String url = "jdbc:oracle:thin:@//127.0.0.1:1521/pdbmyoracle";

        String username = "abc";// 用户名

        String password = "abc";// 密码

        Connection conn = null; // 创建数据库连接对象

        try {

            Class.forName(driver);

            conn = DriverManager.getConnection(url, username, password);

        } catch (ClassNotFoundException e) {

            e.printStackTrace();

        } catch (SQLException e) {

            e.printStackTrace();

        }

        return conn;

    }

    private static void query() {

        Connection conn = getConn();

        String sql = "select * from users";

        PreparedStatement pstmt;

        try {

            pstmt = conn.prepareStatement(sql);

            // 建立一个结果集,用来保存查询出来的结果

            ResultSet rs = pstmt.executeQuery();

            while (rs.next()) {

                String username = rs.getString("USERNAME");

                System.out.println(username);

            }

            rs.close();

            pstmt.close();

            conn.close();

        } catch (SQLException e) {

            e.printStackTrace();

        }

    }

    public static void main(String[] args) {

        query();

    }

}