JDBC简单连接Oracle，jdbcoracle,JDBC The JDB

JDBC简单连接Oracle，jdbcoracle,JDBC The JDB

JDBC The JDBC API is a Java API that can access any kind of tabular data, especially data stored in a Relational Database.JDBC helps you to write Java applications that manage these three programming activities:Connect to a data source, like a databaseSend queries and update statements to the database。Retrieve and process the results received from the database in answer to your query```javapackage jdbc;

import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;

public class jdbc_exp {

public static void main(String[] args) {    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    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:@10.224.188.188:1521:tonytest";// 127.0.0.1是本机地址，XE是精简版Oracle的默认数据库名        String user = "hr";// 用户名,系统默认的账户名        String password = "CCM%lab123";// 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 dept order by 1";// 预编译语句，“？”代表参数        pre = con.prepareStatement(sql);// 实例化预编译语句        result = pre.executeQuery();// 执行查询，注意括号中不需要再加参数        while (result.next())            // 当结果集不为空时            System.out.println("deptno: " + result.getInt("deptno") + " dname: "                    + result.getString("dname") + " loc: " + result.getString("loc")                    + " create_date: " + result.getString("create_date"));    }    catch (Exception e)    {        e.printStackTrace();    }    finally    {        try        {            // 逐一将上面的几个对象关闭，因为不关闭的话会影响性能、并且占用资源            // 注意关闭的顺序，最后使用的最先关闭            if (result != null)                result.close();            if (pre != null)                pre.close();            if (con != null)                con.close();            System.out.println("数据库连接已关闭！");        }        catch (Exception e)        {            e.printStackTrace();        }    }}

}```