标准JDBC连接

来源：互联网发布：郑州淘宝衣族加盟骗局编辑：程序博客网时间：2024/06/05 00:38
<pre name="code" class="java">import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;public class Test {/** * @param args */public static void main(String[] args) {String s = getJson();System.out.println(s);}public static String getJson() {    String s="{\"departmentOfRegister\":[";    Connection con = null;// 创建一个数据库连接    PreparedStatement pre = null;// 创建预编译语句对象，一般都是用这个而不用Statement    ResultSet result = null;// 创建一个结果集对象    PreparedStatement pre2 = null;    ResultSet result2 = null;    try {        Class.forName("oracle.jdbc.driver.OracleDriver");// 加载Oracle驱动程序        System.out.println("开始尝试连接数据库！");        String url = "jdbc:oracle:" + "thin:@127.0.0.1:1521:XE";// 127.0.0.1是本机地址，XE是精简版Oracle的默认数据库名        String user = "user";// 用户名,系统默认的账户名        String password = "password";// 你安装时选设置的密码        con = DriverManager.getConnection(url, user, password);// 获取连接        System.out.println("连接成功！");        String sql = "select * from TABLE where DEFINITIONID=? order by code";// 预编译语句，“？”代表参数        pre = con.prepareStatement(sql);// 实例化预编译语句        pre.setString(1, "departmentOfRegister");// 设置参数，前面的1表示参数的索引，而不是表中列名的索引        result = pre.executeQuery();// 执行查询，注意括号中不需要再加参数        while (result.next()) {        s += "{\"code\":\"" + result.getString("code") + "\",\"name\":\"" + result.getString("codename") + "\"},";        }        s = s.substring(0, s.length()-1);        s += "],\"localPoliceStation\":[";                String sql2 = "select * from TABLE where DEFINITIONID=? order by code";        pre2= con.prepareStatement(sql2);        pre2.setString(1, "localPoliceStation");        result2 = pre2.executeQuery();        while (result2.next()) {        s += "{\"code\":\"" + result2.getString("code") + "\",\"name\":\"" + result2.getString("codename") + "\",\"parentCode\":\"" +         result2.getString("parentCode") + "\"},";        }        s = s.substring(0, s.length()-1);        s += "],\"result\":\"success\"}";    } catch (Exception e) {    e.printStackTrace();    }    return s;}}
0 0