import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class Jdbc_mysql03 { public static void main(String [] args){ try{ // 尝试进行SQL注入攻击 System.out.println("尝试SQL注入攻击..."); authenticateUser("123","12345' or '1=1"); }catch (Exception e){ e.printStackTrace(); } } private static void authenticateUser(String name,String password) throws Exception{ Connection connection= DriverManager.getConnection("jdbc:mysql://localhost:3306/xiaolong","root","123456"); Statement statement=connection.createStatement(); String query="SELECT * FROM MYSQLlock WHERE name='" + name + "' AND password= '"+password+"'"; ResultSet resultSet= statement.executeQuery(query); if(resultSet.next()){ System.out.println("身份验证成功，用户名："+resultSet.getString("name")+"，角色"+resultSet.getString(password)); }else{ System.out.println("身份验证失败"); } connection.close(); } }

java-sqlserver-connect.jar包

import java.sql.DriverManager; import java.sql.SQLException; public class SQLServerConnectExample { public static void main(String[] args) { String url = "jdbc:sqlserver://localhost:1433;database...

DOTA_HERO.rar_hero_hero g3 sqlserv_java sqlServer_查询数据库

在JAVA中，我们可以通过Connection对象建立数据库连接，Statement或PreparedStatement对象来执行SQL语句。对于查询操作，我们可以使用SELECT语句，比如获取所有英雄的信息，或者根据特定条件（如英雄ID或名字）筛选...

import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import java.util.ArrayList; import java.util.List; //import Account.java; public class JDBCResultSet<Stu> { public void testResultSet() throws Exception { Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql:///test01?useSSL=false"; String username = "root"; String password = "03928"; Connection conn = DriverManager.getConnection(url, username, password); String sql = "select * from account"; Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery(sql); List<Stu> list = new ArrayList<>(); while (rs.next()){ Stu student = new Stu(); } } }出现Type parameter 'Stu' cannot be instantiated directly这个错误如何处理

public class Student { private int id; private String name; // ... public Student(int id, String name) { this.id = id; this.name = name; } // ... } 2. 在您的方法中，使用ResultSet对象来...

package connectmysql; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import java.util.Scanner; import java.sql.SQLException; import java.sql.Statement; public class text { private final static String url ="jdbc:mysql://localhost:3306/mytextsql?severTimezone=GMT"; private final static String username="root"; private final static String password="yxh9497"; public static void main(String args[]) { try { Class.forName("com.mysql.cj.jdbc.Driver"); }catch(Exception e) { e.printStackTrace(); } try { Connection connect=DriverManager.getConnection(url,username,password); Statement stmt=connect.createStatement(); Scanner a=new Scanner(System.in); System.out.print("删除的是:"+'\n'); String a4=a.next(); String sql="delete from user where name="+a4; int i=stmt.executeUpdate(sql); if(i > 0){ System.out.println("删除成功"); } }catch(Exception e) { e.printStackTrace(); } } }

import java.sql.ResultSet; import java.sql.Statement; import java.util.Scanner; import java.sql.SQLException; public class text { private final static String url ="jdbc:mysql://localhost:3306/...

import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; //导入驱动包 public class Main { public static void main(String[] args) throws SQLException { // TODO Auto-generated method stub String url ="jdbc:mysql://127.0.0.1:3306/biao"; Connection con=DriverManager.getConnection(url,"root","qqww1122"); Statement stmt=con.createStatement();//连接创建语句 ResultSet rs=stmt.executeQuery("select * from Stus"); while(rs.next()){//循环输出结果集各行 System.out.print(rs.getString(1) + " "); System.out.print(rs.getString(2) + "\t"); System.out.print(rs.getString(3) + " "); System.out.print(rs.getString(4) + "\t "); System.out.println(rs.getInt(5)); } } }帮我解释以上代码

import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; 这里导入了Java连接MySQL数据库所需的驱动包。 2. ...

package project; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class jia { public void ad(String sql, String[] objects) throws SQLException { Connection conn = DriverManager.getConnection("jdbc:mysql://192.168.24.224:3306/dorm", "root", "123456"); PreparedStatement pstm = conn.prepareStatement(sql, 1004, 1007); if (objects != null && objects.length > 0) { for (int i = 0; i < objects.length; i++) { pstm.setObject(i + 1, objects[i]); } } Statement stmt=null; try { stmt =conn.createStatement(); int count=stmt.executeUpdate(sql); System.out.println(count==1?"保存成功":"保存失败"); }catch(SQLException e) { e.printStackTrace(); }finally { try{ if(stmt!=null) { } stmt.close(); }catch(SQLException e) { e.printStackTrace(); } try{ if(conn!=null) { } conn.close(); }catch(SQLException e) { e.printStackTrace(); } } pstm.close(); } }

在方法中，首先通过 DriverManager 类的 getConnection 方法获取一个数据库连接对象，然后使用 PreparedStatement 类的 setObject 方法将占位符的值设置进去。接着，使用 Statement 类的 executeUpdate 方法执行 SQL...

package com.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class DBConn { Connection conn; Statement stmt; ResultSet rs; //返回值参数 public void openDB(){ try { Class.forName("com.mysql.cj.jdbc.Driver"); String url="jdbc:mysql://localhost:3306/test?useSSL=fasle&serverTimezone==GMT%2B8"; conn = DriverManager.getConnection(url,"root","123456"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public int execUpdate(String sql){ int n=0; try { stmt = conn.createStatement(); n = stmt.executeUpdate(sql); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return n; } public void closeDB(){ try { stmt.close(); conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }找错误

3. 调用 execUpdate 方法来执行 SQL 语句。 4. 调用 closeDB 方法来关闭数据库连接。如果你已经按照以上步骤来使用 DBConn 类，但仍然出现错误，可以检查以下几个方面： 1. 检查数据库连接字符串是否正确。 2. ...

package data3; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLDataException; import java.sql.SQLException; import java.text.ParseException; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Scanner; import data3.test.classselect; public class main { private static List<tele> telelist=new ArrayList<tele>(); public static void main(String[] args) throws ClassNotFoundException, SQLException { Scanner scanner = new Scanner(System.in); int choice; while (true) { displayMenu(); choice = scanner.nextInt(); scanner.nextLine(); // 清除输入缓冲区中的换行符 switch (choice) { case 1: showUserList(); break; case 2: update(); break; case 3: Insert(); break; case 4: delete(); break; case 0: System.out.println("感谢使用！"); return; default: System.out.println("无效的选项，请重新输入。"); } } } private static void displayMenu() { System.out.println("------------------手机营销充值中心----------------"); System.out.print("1. 查看手机用户列表"); System.out.print(" 2. 充值"); System.out.print(" 3. 新用户注册"); System.out.print(" 4. 老用户注销"); System.out.println(" 0. 退出"); System.out.print("请选择操作："); } private static List<tele> showUserList() throws SQLException { Connection conn=null; PreparedStatement pst =null; ResultSet rs =null; try { conn = classselect.getConnection(); String sql = "select * from phone"; pst = conn.prepareStatement(sql); rs = pst.executeQuery(); List<tele；；这是一串代码，请帮我完善

try { conn = classselect.getConnection(); String sql = "update phone set balance=balance+? where phone=?"; pst = conn.prepareStatement(sql); pst.setInt(1, amount); pst.setString(2, phone); int rows =...

package com.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class SQLConn { static Connection conn;//打开数据库 static Statement stmt;//运行SQL语句 ResultSet rs;//封装 //打开数据库 public static void openDB(){ try { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); String id="sa"; String pwd="ZhongW123"; String url= "jdbc:sqlserver://127.0.0.1:1433;databaseName=ZhongYaoYuanSys"; "jdbc:sqlserver://localhost:1433;" + "databaseName=ZhongYaoYuanSys;integratedSecurity=true;"; try { conn = DriverManager.getConnection(url, id, pwd); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //执行增删改 public static int execUpdate(String sql){ int n = 0; try { stmt = conn.createStatement(); n = stmt.executeUpdate(sql);//n是受影响的行数 } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return n; } //关闭数据库 public static void closeDB(){ try { stmt.close(); conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //执行查询功能 //public ResultSet execQuery(){ //return rs; } }找bug

"jdbc:sqlserver://127.0.0.1:1433;databaseName=ZhongYaoYuanSys"; 而保留了这一行代码： "jdbc:sqlserver://localhost:1433;" + "databaseName=ZhongYaoYuanSys;integratedSecurity=true;"; 这样，...

package db; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties; public class DBCon { Connection con = null; Statement st = null; ResultSet rs = null; String driver=null; String url = null; String username = null; String password = null; public Connection dbCon() { try { InputStream is=DBCon.class.getClassLoader().getResourceAsStream("db.properties"); Properties prop=new Properties(); try { prop.load(is); driver=prop.getProperty("driver"); url=prop.getProperty("url"); username=prop.getProperty("username"); password=prop.getProperty("password"); } catch (IOException e1) { e1.printStackTrace(); } Class.forName(driver); Class.forName("com.mysql.jdbc.Driver"); url = "jdbc:mysql:///sams?useUnicode=true&characterEncoding=utf8"; username = "root"; password = ""; try { con = DriverManager.getConnection(url, username, password); } catch (SQLException e) { e.printStackTrace(); } } catch (ClassNotFoundException e) { e.printStackTrace(); } return con; } /* * 增删改 / public int query(String sql) { int rs = 0; con = dbCon(); try { st = con.createStatement(); rs = st.executeUpdate(sql); } catch (SQLException e) { close(); e.printStackTrace(); } return rs; } / * 查 / public ResultSet find(String sql) { try { con = dbCon(); st = con.createStatement(); rs = st.executeQuery(sql); } catch (SQLException e) { close(); e.printStackTrace(); } return rs; } / * 关闭数据库 */ public void close() { try { if (rs != null) rs.close(); if (st != null) st.close(); if (con != null) con.close(); } catch (SQLException e) { e.printStackTrace(); } } }有错误

InputStream is=DBCon.class.getClassLoader().getResourceAsStream("db.properties"); Properties prop=new Properties(); try { prop.load(is); driver=prop.getProperty("driver"); url=prop.getProperty(...

import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class Login { Admin admin; void setAdmin(Admin admin) { this.admin=admin; //System.out.println(this.admin.getPassword()+" " + this.admin.getID()); } /* * JudgeAdmin()方法 * 判断User的ID和密码是否正确，如果正确，显示登录成功 * 如果错误，弹出一个窗口，显示账号或密码错误 / private String driver = "com.mysql.jdbc.Driver"; private String url = "jdbc:mysql://localhost:3306/qqq?serverTimezone=UTC&characterEncoding=utf-8"; private String user = "root"; private String password = "root"; public boolean login(Admin admin) throws SQLException, ClassNotFoundException { String sql="select from admin where id=? and password=?"; Class.forName(driver); Connection conn = DriverManager.getConnection(url, user, password); PreparedStatement ps = conn.prepareStatement(sql); ps.setString(1, admin.getID()); ps.setString(2, admin.getPassword()); ResultSet rs = ps.executeQuery(); int ans = 0; if(rs.next()) { ans = 1; } rs.close(); ps.close(); conn.close(); if(ans == 1) { return true; } else return false; } int JudgeAdmin() { try { if(login(this.admin)) { System.out.println("登录成功"); return 1; }else { return 0; } }catch(Exception e) { //e.printStackTrace(); //System.out.println("!!!!!!!!!"); } return 0; } }

这段代码是一个 Java 类，名为 Login，其中包含了一个 Admin 类型的属性 admin 和多个方法。其中 setAdmin 方法用于设置 admin 属性的值，login 方法用于判断用户输入的 ID 和密码是否正确，JudgeAdmin 方法用于判断...

根据提示，在右侧编辑器编写代码，使用PreparedStatement 接口完成查询已知数据表的记录，要求根据键盘输入的 ID 找到该记录。package step1; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.io.; public class JdbcTestFour{ public static final String DBDRIVER="com.mysql.jdbc.Driver"; public static final String DBURL="jdbc:mysql://localhost:3306/school"; public static final String DBUSER="root"; public static final String PASSWORD="123123"; public static void main(String[] args) throws Exception{ int id=0; String name=null; int age=0; String note=null; BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); String sql="SELECT id,name,age,note FROM member WHERE id=?"; Connection conn=null; //每一个Connection 对象表示一个数据库连接 PreparedStatement pstmt=null; //数据库操作对象 / begin / //加载驱动程序 //根据参数DBURL、DBUSER、PASSWORD 创建连接对象conn / end / pstmt=conn.prepareStatement(sql); //执行SQL 语句 System.out.println("请输入学号"); id=Integer.parseInt(br.readLine()); pstmt.setInt(1,id); / begin / ResultSet rs; //查询操作 / end / / begin / //显示查询数据 / end / pstmt.close(); //关闭操作，如果不关闭操作，关闭连接也是一样的 conn.close(); //关闭连接 } }package step1; import java.sql.; public class Insert { public void createDatabase() { try { // 加载数据库驱动程序 Class.forName("com.mysql.jdbc.Driver"); // 建立数据库连接 Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/", "root", "123123"); // 创建 Statement 对象 Statement stmt = conn.createStatement(); // 执行 SQL 语句创建数据库 String sql = "CREATE DATABASE school;"; stmt.executeUpdate(sql); // 关闭 Statement 对象和 Connection 对象 stmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } }

import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.Scanner; public class JdbcTestFour { public static final ...

帮我优化这段代码，谢谢package com.neutech.utils; import java.sql.*; import java.util.ArrayList; import java.util.List; public class Jdbcutil { private static final String DRIVERNAME = "org.apache.hive.jdbc.HiveDriver"; private static final String URL = "jdbc:hive2://192.168.44.199:10000/test"; private static final String USERNAME = "root"; private static final String PASSWORD = "200812"; public static Connection getConnection() throws ClassNotFoundException { Class.forName(DRIVERNAME); Connection connection = null; try { connection = DriverManager.getConnection(URL,USERNAME,PASSWORD); } catch (SQLException throwables) { throwables.printStackTrace(); } return connection; } public static <T> List<T> execuetQuery(String sql, RowMap<T> rowMap, Object... objs) throws ClassNotFoundException, SQLException { // 建立连接 Connection connection = getConnection(); PreparedStatement preparedStatement = connection.prepareStatement(sql); // 注入额外条件 if(objs != null){ for(int i = 0;i <= objs.length;i++){ preparedStatement.setObject(i + 1,objs[i]); } } ResultSet resultSet = preparedStatement.executeQuery(); ArrayList<T> list = new ArrayList<>(); while(resultSet.next()){ T t = rowMap.RowMapping(resultSet); list.add(t); } return list; } public static void close(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet) throws SQLException { connection.close(); preparedStatement.close(); resultSet.close(); } }

import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List...

package 软件本科9班小罗; import java.awt.; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.beans.Statement; import java.sql.; import javax.swing.*; public class Java06 extends JFrame implements ActionListener{ JButton Button; JLabel s1; JTextField text; JTextArea ta; Connection conn; java.sql.Statement stat1; java.sql.Statement stat2; ResultSet rs1,rs2; public Java06() { super("中英文查询"); Button=new JButton("查询"); Button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { chazhao(); } }); s1=new JLabel("输入要查询的单词:"); text =new JTextField("word",20); ta = new JTextArea("工作",7,36); JPanel panel=new JPanel(); panel.add(s1); panel.add(text); panel.add(Button); JPanel panel2=new JPanel(); panel2.add(ta); Container con=getContentPane(); con.add(panel,BorderLayout.NORTH); con.add(panel2); setSize(400,200); } public void chazhao() { String i; try { Class.forName("com.mysql.jdbc.Driver");//加载连接驱动; conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/sys?serverTimezone=UTC", "root", "123456"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block System.out.println("加载驱动失败"); } catch (SQLException e) { System.out.println("获取连接失败"); } String sql1="select 中文 from book where 英文="+"\""+text+"\""; String sql2="select 英文 from book where 中文="+"\""+text+"\""; try { stat1=conn.createStatement(); rs1=stat1.executeQuery(sql1); stat2=conn.createStatement(); rs2=stat2.executeQuery(sql2); while(rs1.next()) { System.out.println(rs1.getString("中文")); } while (rs2.next()) { System.out.println(rs2.getString("英文")); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static void main(String[] args) { new Java06().setVisible(true); } @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub if(e.getSource()==Button) { String text=ta.getText(); ta.setText(text);; } } }这个代码中哪里有错呀，运行不了，还连接不成数据库

3. SQL查询语句错误。你的查询语句可能有问题。你需要检查语句是否正确，并且确定你的数据库中是否有名为“book”的表。 4. 代码中的其他潜在错误。在代码中有其他的潜在错误，例如未处理异常或变量命名错误。你...

import java.sql.; public class TableMonitor { public static void main(String[] args) { try { // 加载数据库驱动程序 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); // 连接数据库 Connection conn = DriverManager.getConnection("jdbc:sqlserver://127.0.0.1:1433;databaseName=GD2030", "sa", "root"); // 创建扩展事件会话 Statement stmt = conn.createStatement(); String createSessionSql = "CREATE EVENT SESSION MyTableChanges ON SERVER ADD EVENT sqlserver.sp_statement_completed (WHERE object_name = 'Client')"; stmt.execute(createSessionSql); // 启动扩展事件会话 String startSessionSql = "ALTER EVENT SESSION MyTableChanges ON SERVER STATE = START"; stmt.execute(startSessionSql); // 监听扩展事件会话 String listenSql = "SELECT * FROM sys.fn_xe_file_target_read_file('C:\MyTableChanges.xel', null, null, null)"; PreparedStatement pstmt = conn.prepareStatement(listenSql); ResultSet rs = pstmt.executeQuery(); // 处理扩展事件 while (rs.next()) { String event = rs.getString(1); System.out.println(event); } // 关闭连接 rs.close(); pstmt.close(); stmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } }，这段代码运行就报错错误信息如下，Exception in thread "main" java.lang.UnsupportedClassVersionError: com/microsoft/sqlserver/jdbc/SQLServerDriver has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:468) at java.net.URLClassLoader.access$100(URLClassLoader.java:74) at java.net.URLClassLoader$1.run(URLClassLoader.java:369) at java.net.URLClassLoader$1.run(URLClassLoader.java:363) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:362) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at com.example.demo.TableMonitor.main(TableMonitor.java:8)，怎么结解决

这个错误的原因是你运行代码的 JRE 版本低于编译代码时所使用的 JDK ...javac -source 1.8 -target 1.8 TableMonitor.java 这将使用 JDK 8 编译代码，生成的 class 文件版本为 52，可以在低版本的 JRE 上运行。

package package06; import java.awt.; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.; import javax.swing.*; public class Java6 extends JFrame { JLabel wenzi; JTextField shuru; JButton chaxun; JTextArea fanhui; public Java6(){ super("中英查询软件"); // 窗口添加pNorth 在北面区域 add(getNorthPanel(),BorderLayout.NORTH); } private JPanel getNorthPanel() { JPanel panel = new JPanel(); wenzi = new JLabel("请输入要查询的单词："); shuru=new JTextField(8); chaxun=new JButton("查询"); fanhui =new JTextArea(6,25); panel.add(wenzi,new FlowLayout()); panel.add(shuru,new FlowLayout()); panel.add(chaxun,new FlowLayout()); panel.add(fanhui,new FlowLayout()); return panel; } public static void main(String[] args) throws Exception{ Java6 zy=new Java6(); zy.setBounds(100, 100, 340, 170); zy.setVisible(true); zy.setDefaultCloseOperation(zy.EXIT_ON_CLOSE); Class.forName("com.mysql.cj.jdbc.Driver"); //加载MySQL的驱动类 String ur1="jdbc:mysql://localhost:3306/java实训"; String user="root"; String password="root"; try { Connection Con =DriverManager.getConnection(ur1,user,password); System.out.println("eeeeee"); } catch (Exception e) { // TODO: handle exception System.out.println("ww"); } } }这些代码连接不了数据库，是哪里错误了吗？

public class Java6 extends JFrame { JLabel wenzi; JTextField shuru; JButton chaxun; JTextArea fanhui; public Java6() { super("中英查询软件"); add(getNorthPanel(), BorderLayout.NORTH); } ...

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