Java-JDBC连接Oracle 数据库

package com.zse.oracle;
import oracle.jdbc.*;
import java.sql.*;

import javax.swing.text.html.HTMLDocument.HTMLReader.PreAction;
public class Test {

    public static void main(String[] args) {

        //载入驱动
        try {
            Class.forName("oracle.jdbc.OracleDriver");
            String url="jdbc:oracle:thin:@127.0.0.1:1521:xe";
            String user="root";
            String pass="111";

            //通过驱动管理器获取 oracle数据库连接
            Connection conn= DriverManager.getConnection(url, user, pass);

            //添加纪录
            Statement  st=conn.createStatement();
            //添加语句
            //String sql="insert into student values(3,‘ccc‘,‘444‘)";//设计执行语句

            //修改语句
            //String sql="update student set pass=‘999‘ where sid=1";

            //删除语句
            //String sql="delete from student where sid=1";

            //st.execute(sql);//执行语句

            //读取所有记录
            //String sql="select * from student  where name=‘aaa‘ and pass=‘111‘  order by sid";
            //通过查询返回一个结果

            //模糊查询
            //String sql="select count(*) as num from student where name like ‘%a%‘";

            //ResultSet rs = st.executeQuery(sql);

            //遍历结果输出记录
//            while(rs.next())//判断是否有下一条记录存在,如果存在则游标往后移动一格
//            {
//                //System.out.println(rs.getString("sid")+";"+rs.getString("name")+";"+rs.getString("pass"));
//                System.out.println(rs.getString("num"));
//            }

            //预编译:记录插入
//            String sql="insert into student values(?,?,?)";
//            PreparedStatement ps=conn.prepareStatement(sql);
//            //输入参数
//            ps.setInt(1,5);
//            ps.setString(2, "eee");
//            ps.setString(3, "888");
//
//            ps.execute();

            //预编译:修改记录
            //String sql="update student set pass=? where name=?";
            //PreparedStatement ps=conn.prepareStatement(sql);
            //ps.setString(1, "666");
            //ps.setString(2, "aaa");

            //ps.execute();

            //预编译：删除记录
//            String sql="delete from student where sid=?";
//            PreparedStatement ps=conn.prepareStatement(sql);
//            ps.setInt(1, 1);
//            ps.execute();

            //预编译：查找
            String sql="select * from student where name like ?";
            PreparedStatement ps=conn.prepareStatement(sql);
            ps.setString(1, "%a%");
            ResultSet rs = ps.executeQuery();

            //输出结果
            while(rs.next())
            {
                System.out.println(rs.getString("sid")+";"+rs.getString("name")+";"+rs.getString("pass"));
            }

            System.out.println("记录添加成功");

            //System.out.println("数据库连接成功");
           // System.out.println("记录添加成功");
        } catch (Exception e) {
            //e.printStackTrace();
            System.out.println("数据库连接失败="+e.getMessage());
        }

    }

}