resultset

/** * jdbc 查询语句 Student类省略 */ import Day01 . Text03 . Student ; import java . sql . * ; public class Deom { public static void main ( String [ ] args ) { Connection conn = null ; Statement statement = null ; ResultSet resultSet = null ; try { /** * 注册驱动 */ Class . forName ( "com.mysql.jdbc.Driver" ) ; /** * 获得数据库连接对象 */ conn = DriverManager . getConnection ( "jdbc:mysql:///my_db" , "root" , "hao" ) ; /** * 获取执行sql对象 */ statement = conn . createStatement ( ) ; /** * 定义sql */ String sql = "select * from student" ; /** * 执行sql,并返回结果集 */ resultSet = statement . executeQuery ( sql ) ; /** * 处理结果 */

连接了数据库，数据库的增删改查，建用户数据库。 写了住界面和功能界面，拟制公文的界面 package util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import entity.Doc; import entity.Permission; import entity.Users; /** * * @author twj * */ public class DBUtil { private static String db_url = "jdbc:mysql://localhost:3306/test3?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC"; public static String db_user = "root"; public static String db_pass = "123"; public static

package com.official.util; 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 org.apache.catalina.User; import com.official.bean.Doc; import com.official.bean.Permission; import com.official.bean.Users; public class DBUtil { //数据库URL和账号密码 private static final String connectionURL="jdbc:mysql://localhost:3306/doc_system?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT&allowPublicKeyRetrieval=true"; private static final String username=

这个测试对我来言有些难度，短时间内做不了太多。首先是思路的理清，登录后的界面有好几种，而且公文的状态也有好几种。理清思路就花了一些时间 然后大致的框架做了做，然后将用户的增删改查还有公文的增删改查写了写。登录界面也完成了，不过不同角色登陆后的界面还没来得及做。主要就是功能太多，运用不熟练 数据库 bean层的基本信息 package com.bean; public class User { private int id; private String username; private String password; private int permissionId; private int status; public int getStatus() { return status; } public void setStatus(int status) { this.status = status; } public int getId() { return id; } public void setId(int id) { this.id = id; } private String job; public String getUsername() { return username; } public void setUsername(String username)

1、代码 import java.sql.*; public class DBUtil { public static void main(String[] args) throws ClassNotFoundException, SQLException { Class.forName("com.mysql.cj.jdbc.Driver"); Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/imooc", "root", "123"); Statement statement = connection.createStatement(); ResultSet resultSet = statement.executeQuery("select user_name, age from imooc_gaddess"); while (resultSet.next()){ System.out.println(resultSet.getString("user_name") + "年龄：" + resultSet.getInt("age")); } } } 2、依赖 3、数据库 4、运行结果 来源： https://www.cnblogs.com/yanguobin/p