Mysql数据库的增删改查

在运行程序之前需要在mysql数据库中创建test数据库，如下图所示:

下面是具体是实现程序:

　　

 package News;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.Scanner;

 public class News {
     public static void main(String[] args) {
         System.out.println("< < < < < < 使用ArrayList实现新闻管理系统 > > > > > >");

         while (true) {
             Scanner scanner = new Scanner(System.in);
             System.out
                     .println("1. 查询全部新闻\n2. 添加新闻\n3. 删除新闻\n4. 按标题查询新闻\n5. 按标题修改新闻 \n0.退出\n请选择功能（1，2，3，4，5，0）：");
             int selected = scanner.nextInt();

             switch (selected) {
             case 1:
                 reads();
                 break;

             case 2:
                 System.out.println("请输入新闻标题:");
                 String title = scanner.next();
                 System.out.println("请输入新闻内容:");
                 String content = scanner.next();
                 System.out.println("请输入新闻备注:");
                 String remark = scanner.next();

                 add(title, content,remark);
                 break;

             case 3:
                 System.out.println("请输入新闻标题:");
                 String title2 = scanner.next();
                 delete(title2);
                 break;

             case 4:
                 System.out.println("请输入新闻标题:");
                 String title1 = scanner.next();
                 read(title1);
                 break;

             case 5:
                 System.out.println("请输入新闻标题:");
                 String title3 = scanner.next();
                 update(title3);
                 break;

             case 0:
                 scanner.close();
                 System.exit(0);
                 break;

             default:
                 System.out.println("输入错误，请重新输入:");
                 break;
             }
         }
     }

     /**
      * 定义添加新闻方法
      *
      * @param title
      *            标题
      * @param content
      *            内容
      */
     public static void add(String title, String content,String remark) {
         try {
             Class.forName("com.mysql.jdbc.Driver");
             String url = "jdbc:mysql://localhost:3306/test";
             String user = "root";
             String password = "root";
             Connection conn = DriverManager.getConnection(url, user, password);
             Statement st = conn.createStatement();
             String sql = "insert into news values(null,'" + title + "','"
                     + content + "','"+ remark + "')";
             int row = st.executeUpdate(sql);
             System.out.println(row > 0 ? "添加成功" : "添加失败");
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     /**
      * 定义查询全部方法
      */
     public static void reads() {
         try {
             Class.forName("com.mysql.jdbc.Driver");
             String url = "jdbc:mysql://localhost:3306/test";
             String user = "root";
             String password = "root";
             Connection conn = DriverManager.getConnection(url, user, password);
             Statement st = conn.createStatement();
             String sql = "select * from news";
             ResultSet list = st.executeQuery(sql);
             if (list != null) {
                 while (list.next()) {
                     int id = list.getInt(1);
                     String title = list.getString(2);
                     String content = list.getString(3);
                     String remark = list.getString(4);
                     System.out.println(id + "\t" + title + "\t" + content
                             + "\t" + remark);
                 }
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     /**
      * 定义根据标题查询新闻的方法
      *
      * @param title1
      *            新闻标题
      */
     public static void read(String title1) {
         try {
             Class.forName("com.mysql.jdbc.Driver");
             String url = "jdbc:mysql://localhost/test";
             String user = "root";
             String password = "root";
             Connection conn = DriverManager.getConnection(url, user, password);
             Statement st = conn.createStatement();
             String sql = "select * from news where title='" + title1 + "'";
             ResultSet row = st.executeQuery(sql);
             if (row.next()) {
                 int id = row.getInt(1);
                 String title = row.getString(2);
                 String content = row.getString(3);
                 String remark = row.getString(4);
                 System.out.println(id + "\t" + title + "\t" + content + "\t"
                         + remark);
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     /**
      * 定义按标题删除新闻的方法
      *
      * @param title
      *            新闻方法
      */
     public static void delete(String title) {
         try {
             Class.forName("com.mysql.jdbc.Driver");
             String url = "jdbc:mysql://localhost:3306/test";
             String user = "root";
             String password = "root";
             Connection conn = DriverManager.getConnection(url, user, password);
             Statement st = conn.createStatement();
             String sql = "delete from news where title='" + title + "'";
             int row = st.executeUpdate(sql);
             System.out.println(row > 0 ? "删除成功" : "删除失败");
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     /**
      * 定义根据标题修改新闻的方法
      *
      * @param title
      *            新闻标题
      */
     public static void update(String title) {

         try {
             Class.forName("com.mysql.jdbc.Driver");
             String url = "jdbc:mysql://localhost:3306/test";
             String user = "root";
             String password = "root";
             Connection conn = DriverManager.getConnection(url, user, password);
             Statement st = conn.createStatement();
             String sql = "select * from news where title='" + title + "'";
             ResultSet list = st.executeQuery(sql);
             if (list.next()) {
                 Scanner sca = new Scanner(System.in);
                 System.out.println("请输入新的新闻标题:");
                 String title4 = sca.next();
                 System.out.println("请输入新闻内容:");
                 String content = sca.next();
                 System.out.println("请输入备注:");
                 String remark = sca.next();

                 String sql1 = "update news set title='" + title4
                         + "',content='" + content + "',remark='" + remark + "' where title='"+title+"'";
                 System.out.println(sql1);
                 int u = st.executeUpdate(sql1);
                 System.out.println(u > 0 ? "修改成功" : "修改失败");
                 sca.close();
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 }