news 2026/4/13 16:37:50

SDUT Java---jdbc

作者头像

张小明

前端开发工程师

1.2k 24
文章封面图
SDUT Java---jdbc

8-1 sdut-JDBC-1 实现数据库表的CRUD操作

import java.sql.*; public class Main { public static void main(String[] args) throws ClassNotFoundException, SQLException { Connection con = DriverManager.getConnection( "jdbc:mysql://localhost:3306/school?useunicode=true&characterEncoding=utf-8", "root", "123456"); //数据库服务器名称(地址)、端口号、数据库名称、用户名、密码须根据实际情况改变 Statement st = con.createStatement(); //向表中增加记录并显示所有记录(数据自己指定); String insertSQL1 = "insert into student values(null,'嘿嘿',86);"; String insertSQL2 = "insert into student values(null,'哈哈',99);"; String insertSQL3 = "insert into student values(null,'呼呼',88);"; st.executeUpdate(insertSQL1); st.executeUpdate(insertSQL2); st.executeUpdate(insertSQL3); System.out.println("--1.增加-------"); String selectall = "Select * from student"; ResultSet rs = st.executeQuery(selectall); while(rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); double score = rs.getDouble(3); System.out.println(id + " " + name + " " + score); } //从表中删除id=1的记录,并显示所有记录; String deletSQL = "delete from student where id=1"; st.executeUpdate(deletSQL); System.out.println("--2.删除---"); rs = st.executeQuery(selectall); while(rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); double score = rs.getDouble(3); System.out.println(id + " " + name + " " + score); } //修改表中记录:查询条件id=2,将name修改为:山东理工,修改完毕显示所有记录; System.out.println("\n--3.修改---"); String updateSQL = "update student set name='山东理工' where id=2"; st.executeUpdate(updateSQL); rs = st.executeQuery(selectall); while(rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); double score = rs.getDouble(3); System.out.println(id + " " + name + " " + score); } //查询表中id=3的记录并显示。 System.out.println("\n-4.条件查询-----"); String selectSQL = "select * from student where id=3"; rs = st.executeQuery(selectSQL); if(rs.next()) { int id = rs.getInt("id"); String name = rs.getString("name"); double score = rs.getDouble("score"); System.out.println(id + " " + name + " " + score); } } }

8-2 sdut-JDBC-2 实现数据库表的CRUD操作_中级(PreparedStatement)

import java.sql.*; public class Main { public static void main(String[] args) throws SQLException { Connection con = DriverManager.getConnection( "jdbc:mysql://localhost:3306/school?useunicode=true&characterEncoding=utf-8", "root", "123456"); //数据库服务器名称(地址)、端口号、数据库名称、用户名、密码须根据实际情况改变 PreparedStatement pst = null; //向表中增加记录(id列自增,可只考虑姓名和成绩),并显示所有记录; String insertSQL = "insert into student values(null, ?, ?)"; pst = con.prepareStatement(insertSQL); pst.setString(1, "ANNa"); pst.setDouble(2, 86.5); pst.executeUpdate(); System.out.println("--1.插入------"); String selectall = "Select * from student"; ResultSet rs = pst.executeQuery(selectall); while(rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); double score = rs.getDouble(3); System.out.println(id + " " + name + " " + score); } //从表中删除id=? 的记录,并显示所有记录; String deleteSQL = "delete from student where id=?"; pst = con.prepareStatement(deleteSQL); pst.setInt(1, 1); pst.executeUpdate(); System.out.println("\n--2.删除-----"); rs = pst.executeQuery(selectall); while(rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); double score = rs.getDouble(3); System.out.println(id + " " + name + " " + score); } //修改表中记录:查询条件id=?,将name修改为:?,修改完毕显示所有记录; String updateSQL = "update student set name=? where id=?"; pst = con.prepareStatement(updateSQL); pst.setString(1, "山东理工"); pst.setInt(2, 2); pst.executeUpdate(); System.out.println("\n--3.修改-----"); rs = pst.executeQuery(selectall); while(rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); double score = rs.getDouble(3); System.out.println(id + " " + name + " " + score); } //查询表中id=? 的记录并显示。 String selectSQL = "select * from student where id=?"; pst = con.prepareStatement(selectSQL); pst.setInt(1, 3); rs = pst.executeQuery(); System.out.println("\n--4.查询-----"); if(rs.next()) { int id = rs.getInt("id"); String name = rs.getString("name"); double score = rs.getDouble("score"); System.out.println(id + " " + name + " " + score); } rs.close(); pst.close(); con.close(); } }

8-3 sdut-JDBC-3 实现数据库表的CRUD操作_中级(事务)

import java.sql.*; public class Main { public static void main(String[] args) throws SQLException { Connection con = DriverManager.getConnection( "jdbc:mysql://localhost:3306/school?useunicode=true&characterEncoding=utf-8", "root", "123456"); //数据库服务器名称(地址)、端口号、数据库名称、用户名、密码须根据实际情况改变 con.setAutoCommit(false); PreparedStatement pst = null; //向表中增加1条记录,id列自增,可只考虑姓名和成绩列的数据, String insertSQL = "insert into student values(null, ?, ?)"; pst = con.prepareStatement(insertSQL); pst.setString(1, "CHRISE"); pst.setDouble(2, 86.5); int result1 = pst.executeUpdate(); //从表中删除id=? 的记录; String deleteSQL = "delete from student where id=?"; pst = con.prepareStatement(deleteSQL); pst.setInt(1, 2); int result2 = pst.executeUpdate(); int result = result1*result2; System.out.println(result == 1 ? "增加记录和删除记录成功" : "增加记录和删除记录失败"); if(result == 1) { con.commit(); } else { con.rollback(); } // 显示所有 System.out.println("\n---表中记录为--"); String selectall = "select * from student"; ResultSet rs = pst.executeQuery(selectall); while(rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); double score = rs.getDouble(3); System.out.println(id + " " + name + " " + score); } rs.close(); pst.close(); con.close(); } }
版权声明: 本文来自互联网用户投稿,该文观点仅代表作者本人,不代表本站立场。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如若内容造成侵权/违法违规/事实不符,请联系邮箱:809451989@qq.com进行投诉反馈,一经查实,立即删除!
网站建设 2026/4/6 5:58:45

在Windows上搭建专业级日志管理中心的完整指南

在Windows上搭建专业级日志管理中心的完整指南 【免费下载链接】visualsyslog Syslog Server for Windows with a graphical user interface 项目地址: https://gitcode.com/gh_mirrors/vi/visualsyslog 想要让网络设备日志管理变得简单高效吗?Visual Syslog…

作者头像 李华
网站建设 2026/4/12 0:51:50

Hotkey Detective:精准解决Windows热键冲突的专业利器

Hotkey Detective:精准解决Windows热键冲突的专业利器 【免费下载链接】hotkey-detective A small program for investigating stolen hotkeys under Windows 8 项目地址: https://gitcode.com/gh_mirrors/ho/hotkey-detective 在日常使用Windows系统时&…

作者头像 李华
网站建设 2026/4/6 10:51:14

ZerotierFix终极指南:解锁Android设备上的高级网络配置

你是否厌倦了传统网络连接的限制?想要在Android设备上获得更灵活、更强大的网络连接能力?ZerotierFix正是为你量身打造的解决方案。这个基于官方Zerotier客户端深度定制的Android应用,不仅保留了原版的所有功能,更添加了许多实用特…

作者头像 李华
网站建设 2026/4/6 19:10:29

PiliPlus:解锁B站第三方客户端的终极观影体验

PiliPlus:解锁B站第三方客户端的终极观影体验 【免费下载链接】PiliPlus PiliPlus 项目地址: https://gitcode.com/gh_mirrors/pi/PiliPlus 在众多视频平台中,B站以其独特的社区氛围和丰富的内容生态深受用户喜爱。然而官方客户端的某些限制让不少…

作者头像 李华
网站建设 2026/4/8 11:09:46

暗黑破坏神2单机革命:PlugY插件如何让你重新定义游戏体验

暗黑破坏神2单机革命:PlugY插件如何让你重新定义游戏体验 【免费下载链接】PlugY PlugY, The Survival Kit - Plug-in for Diablo II Lord of Destruction 项目地址: https://gitcode.com/gh_mirrors/pl/PlugY 还在为暗黑2单机模式的种种限制而烦恼吗&#x…

作者头像 李华