1 create table student
2 (
3        id number(11) not null primary key,
4        stu_name varchar(16) not null,
5        gender number(11) default null,
6        age number(11) default null,
7        address varchar(128) default null
8 );

insert into student values('1','王小军','1','17','30号102')+

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;public class OperateOracle {// 定义连接所需的字符串// 192.168.0.X是本机地址(要改成自己的IP地址)，1521端口号，XE是精简版Oracle的默认数据库名private static String USERNAMR = "orcl";private static String PASSWORD = "orcl";private static String DRVIER = "oracle.jdbc.OracleDriver";private static String URL = "jdbc:oracle:thin:@192.168.0.X:1521:xe";// 创建一个数据库连接Connection connection = null;// 创建预编译语句对象，一般都是用这个而不用StatementPreparedStatement pstm = null;// 创建一个结果集对象ResultSet rs = null;/*** 向数据库中增加数据* 首先获取表内数据总数,总数+1为新增数据的id值* @param stuName:学生姓名* @param gender:学生性别,1表示男性,2表示女性* @param age:学生年龄* @param address:学生住址*/public void AddData(String stuName, int gender, int age, String address) {connection = getConnection();// String sql =// "insert into student values('1','王小军','1','17','30号楼7门102')";String sql = "select count(*) from student where 1 = 1";String sqlStr = "insert into student values(?,?,?,?,?)";int count = 0;try {// 计算数据库student表中数据总数pstm = connection.prepareStatement(sql);rs = pstm.executeQuery();while (rs.next()) {count = rs.getInt(1) + 1;System.out.println(rs.getInt(1));}// 执行插入数据操作pstm = connection.prepareStatement(sqlStr);pstm.setInt(1, count);pstm.setString(2, stuName);pstm.setInt(3, gender);pstm.setInt(4, age);pstm.setString(5, address);pstm.executeUpdate();} catch (SQLException e) {e.printStackTrace();} finally {ReleaseResource();}}/*** 向数据库中删除数据* @param stuName:根据姓名删除数据*/public void DeleteData(String stuName) {connection = getConnection();String sqlStr = "delete from student where stu_name=?";System.out.println(stuName);try {// 执行删除数据操作pstm = connection.prepareStatement(sqlStr);pstm.setString(1, stuName);pstm.executeUpdate();} catch (SQLException e) {e.printStackTrace();} finally {ReleaseResource();}}/*** 向数据库中修改数据* @param stuName:学生姓名,根据此值查询要修改的某行值* @param gender* @param age* @param address*/public void UpdateData(String stuName, int gender, int age, String address) {connection = getConnection();String sql = "select id from student where 1 = 1 and stu_name = ?";String sqlStr = "update student set stu_name=?,gender=?,age=?,address=? where id=?";int count = 0;try {// 计算数据库student表中数据总数pstm = connection.prepareStatement(sql);pstm.setString(1, stuName);rs = pstm.executeQuery();while (rs.next()) {count = rs.getInt(1);System.out.println(rs.getInt(1));}// 执行插入数据操作pstm = connection.prepareStatement(sqlStr);pstm.setString(1, stuName);pstm.setInt(2, gender);pstm.setInt(3, age);pstm.setString(4, address);pstm.setInt(5, count);pstm.executeUpdate();} catch (SQLException e) {e.printStackTrace();} finally {ReleaseResource();}}/*** 向数据库中查询数据*/public void SelectData() {connection = getConnection();String sql = "select * from student where 1 = 1";try {pstm = connection.prepareStatement(sql);rs = pstm.executeQuery();while (rs.next()) {String id = rs.getString("id");String name = rs.getString("stu_name");String gender = rs.getString("gender");String age = rs.getString("age");String address = rs.getString("address");System.out.println(id + "\t" + name + "\t" + gender + "\t"+ age + "\t" + address);}} catch (SQLException e) {e.printStackTrace();} finally {ReleaseResource();}}/*** 使用ResultSetMetaData计算列数*/public void SelectData2() {connection = getConnection();String sql = "select * from employees where 1 = 1";int count = 0;try {pstm = connection.prepareStatement(sql);rs = pstm.executeQuery();while (rs.next()) {count++;}ResultSetMetaData rsmd = rs.getMetaData();int cols_len = rsmd.getColumnCount();System.out.println("count=" + count + "\tcols_len=" + cols_len);} catch (SQLException e) {e.printStackTrace();} finally {ReleaseResource();}}/*** 获取Connection对象* * @return*/public Connection getConnection() {try {Class.forName(DRVIER);connection = DriverManager.getConnection(URL, USERNAMR, PASSWORD);System.out.println("成功连接数据库");} catch (ClassNotFoundException e) {throw new RuntimeException("class not find !", e);} catch (SQLException e) {throw new RuntimeException("get connection error!", e);}return connection;}/*** 释放资源*/public void ReleaseResource() {if (rs != null) {try {rs.close();} catch (SQLException e) {e.printStackTrace();}}if (pstm != null) {try {pstm.close();} catch (SQLException e) {e.printStackTrace();}}if (connection != null) {try {connection.close();} catch (SQLException e) {e.printStackTrace();}}}
}

public class Test {public static void main(String[] args) {/*** 增删改查完成,但是有一定局限性* 1.增  问题不大* 2.删  要给出一个值去删除(可能值不存在-->没有处理机制,值不唯一怎么处理?)* 3.改  同删的问题* 4.查  问题不大*///创建OperateOracle对象OperateOracle oo=new OperateOracle();//测试增加数据操作//oo.AddData("孙",1,25,"111号");//测试删除数据操作//oo.DeleteData("孙");//测试更新数据操作oo.UpdateData("孙",1,30,"11号");//测试查询数据操作//oo.SelectData();//测试ResultSetMetaData类//oo.SelectData2();}}