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());
}

}

}