zoukankan      html  css  js  c++  java
  • SQLite(三)

    //插入数据

            btn3=(Button)findViewById(R.id.btn3);

            btn3.setOnClickListener(new OnClickListener(){

               public void onClick(View v) {

                  // 建立数据对象

                  ContentValues values=new ContentValues();

                  values.put("id", 2);

                  values.put("name", "guoxu");

                  SqlHelper db=new SqlHelper(SqLiteDemoActivity.this, "myhome.db");

                    // 获得可写的表

                   SQLiteDatabase sqlitedb=db.getWritableDatabase();

    // 插入数据

                   sqlitedb.insert("user", null, values);

    // 关闭数据库

                   db.close();

                    System.out.println("data is insert");

               }

            

            });

            //更新数据

            btn4=(Button)findViewById(R.id.btn4);

            btn4.setOnClickListener(new OnClickListener(){

               public void onClick(View v) {

                  // TODO Auto-generated method stub

                  ContentValues values=new ContentValues();

                  values.put("name", "郭旭");

                  SqlHelper db=new SqlHelper(SqLiteDemoActivity.this, "myhome.db");

                   SQLiteDatabase sqlitedb=db.getWritableDatabase();

                   sqlitedb.update("user", values, "id=?", new String[]{"1"});

                   System.out.println("data is update");

                   db.close();

               }

            

            });

            //删除数据

            btn5=(Button)findViewById(R.id.btn5);

            btn5.setOnClickListener(new OnClickListener(){

               public void onClick(View v) {

                  SqlHelper db=new SqlHelper(SqLiteDemoActivity.this, "myhome.db");

                   SQLiteDatabase sqlitedb=db.getWritableDatabase();

                   sqlitedb.delete("user", "id=?", new String[]{"2"});

                   System.out.println("data is update");

                   db.close();

               }

            

            });

            //查询数据

            btn6=(Button)findViewById(R.id.btn6);

            btn6.setOnClickListener(new OnClickListener(){

               public void onClick(View v) {

                  // TODO Auto-generated method stub

                  SqlHelper db=new SqlHelper(SqLiteDemoActivity.this, "myhome.db");

                   SQLiteDatabase sqlitedb=db.getReadableDatabase();

                   Cursor cursor=sqlitedb.query("user", new String[]{"id","name"},

                        nullnullnullnull, "id desc");

                   StringBuffer str=new StringBuffer();

                   while(cursor.moveToNext()){

                   int id=cursor.getInt(cursor.getColumnIndex("id"));

                   String name=cursor.getString(cursor.getColumnIndex("name"));

                   str.append("id="+id);

                   str.append("<br>name="+name+"<br>");

                   }

                   datatxt=(TextView)findViewById(R.id.datatxt);

                   datatxt.setText(Html.fromHtml(str.toString()));

               }

            

            });

        }

    }

  • 相关阅读:
    [转]Intellij IDEA快捷键与使用小技巧
    Swoole来实现实时异步任务队列
    php 异步执行脚本
    Centos 7 systemctl和防火墙firewalld命令
    tgz的解压
    error: C++ preprocessor "/lib/cpp" fails sanity check错误解决方法
    Linux 命令详解(三)./configure、make、make install 命令
    LNMP, CentOS7.0+Nginx+Mysql5.7+PHP7环境安装
    phpmailer使用qq邮箱、163邮箱成功发送邮件实例代码
    Mibew Messenger (also known as Open Web Messenger)
  • 原文地址:https://www.cnblogs.com/itfenqing/p/4429526.html
Copyright © 2011-2022 走看看