Android进阶--第三方插件LitePalFramework/LitePal

含义

安卓图书馆,使开发人员可以使用SQLite数据库极为容易。使用方便

快速设置

使用AndroidStudio

  • 在build.gradle中添加依赖
    在build.gradle中添加查看数据库依赖
    compile 'org.litepal.android:core:1.6.1'
    debugImplementation 'com.amitshekhar.android:debug-db:1.0.3'
  • 配置litepal.xml

    在Project模式下,main根目录下创建文件夹assets,并在此文件夹中创建file,命名为litepal.xml

<litepal>

    <dbname value="demo" />


    <version value="1" />


    <list>

        <mapping class="com.homework.activity.litepaldemo.Album"/>
        <mapping class="com.homework.activity.litepaldemo.Song"/>

    list>


litepal>
  • 配置litepalapplication

    在AndroidManifest中添加


    "org.litepal.LitePalApplication"
        ...
    >
        ...
    

开始

  • 创建表Album
public class Album extends DataSupport {

    @Column(unique = true, defaultValue = "unknown")
    private String name;

    private float price;


    private List songs = new ArrayList<>();

    // generated getters and setters.添加构造方法
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }



    public List getBooks() {
        return songs;
    }

    public void setBooks(List books) {
        this.songs = books;
    }
}
  • 创建表Song
public class Song extends DataSupport{
    @Column(nullable = false)
    private String name;

    private int duration;

    @Column(ignore = true)
    private String uselessField;

    private Album album;

    // generated getters and setters.添加构造方法

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getDuration() {
        return duration;
    }

    public void setDuration(int duration) {
        this.duration = duration;
    }

    public String getUselessField() {
        return uselessField;
    }

    public void setUselessField(String uselessField) {
        this.uselessField = uselessField;
    }

    public Album getAlbum() {
        return album;
    }

    public void setAlbum(Album album) {
        this.album = album;
    }
}
  • 将这两个表映射到在列表litepal.xml
<list>

        <mapping class="com.homework.activity.litepaldemo.Album"/>
        <mapping class="com.homework.activity.litepaldemo.Song"/>

    list>
  • 保存数据

    简单的创建数据库,在Mainactivity添加一行代码

SQLiteDatabase db = LitePal.getDatabase();

做增删修查的操作,屏蔽之前的创建数据库代码

 String albumName=albumEt.getText().toString();
                float price=109.9f;

                Album album=new Album();
                album.setName(albumName);
                album.setPrice(price);
                album.save();//保存至数据库

Album album1= DataSupport.find(Album.class,1);//id为1的数据
                album1.setName("Fantasy");//要修改成的代码
                album1.save();

//直接删除id为2的数据

int row=DataSupport.delete(Album.class,2);

//删除多行数据

int row=DataSupport.deleteAll(Album.class,"id>?","3");
Toast.makeText(this,"您删除了"+row+"行数据",Toast.LENGTH_SHORT).show();


//显示全部

 List albumList=DataSupport.findAll(Album.class);

//按照要求筛选显示

List albumList=DataSupport.where("id>? and name like ?","9","a%").find(Album.class);

//按照name从小到大排列显示

List albumList=DataSupport.where("name like ?","a%").order("name").find(Album.class);

在后面添加foreach循环,打印日志

for (Album a:
     albumList) {
     Log.e("MAIN",a.getName()+"****");
                }

奉上全部完整代码

Mainactivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private EditText albumEt;
    private Button addalbumBtn;
    private Button modifyalbumBtn;
    private Button deletealbumBtn;
    private Button queytalbumBtn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      // SQLiteDatabase db = LitePal.getDatabase();
        bindID();

    }

    private void bindID() {
        albumEt=findViewById(R.id.album_et);
        addalbumBtn=findViewById(R.id.add_album_btn);
        modifyalbumBtn=findViewById(R.id.modify_album_btn);
        deletealbumBtn=findViewById(R.id.delete_album_btn);
        queytalbumBtn=findViewById(R.id.query_album_btn);

        addalbumBtn.setOnClickListener(this);
        modifyalbumBtn.setOnClickListener(this);
        deletealbumBtn.setOnClickListener(this);
        queytalbumBtn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.add_album_btn:

                String albumName=albumEt.getText().toString();
                float price=109.9f;

                Album album=new Album();
                album.setName(albumName);
                album.setPrice(price);
                album.save();//保存至数据库

                break;
            case R.id.modify_album_btn:
                    Album album1= DataSupport.find(Album.class,1);
                    album1.setName("Fantasy");
                    album1.save();
                break;
            case R.id.delete_album_btn:
               // int row=DataSupport.delete(Album.class,2);
                int row=DataSupport.deleteAll(Album.class,"id>?","3");
                Toast.makeText(this,"您删除了"+row+"行数据",Toast.LENGTH_SHORT).show();
                break;
            case R.id.query_album_btn:
        //        List albumList=DataSupport.findAll(Album.class);//显示全部
        //        List albumList=DataSupport.where("id>? and name like ?","9","a%").find(Album.class);//按照要求筛选
                List albumList=DataSupport.where("name like ?","a%").order("name").find(Album.class);//按照name从小到大排列
                for (Album a:
                     albumList) {
                    Log.e("MAIN",a.getName()+"****");
                }
                break;
        }
    }
}

litepal.xml

<litepal>

    <dbname value="demo" />

    <version value="1" />

    <list>

        <mapping class="com.homework.activity.litepaldemo.Album"/>
        <mapping class="com.homework.activity.litepaldemo.Song"/>

    list>

litepal>

activity_main

"http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.homework.activity.litepaldemo.MainActivity">

   id="@+id/album_et"
       android:layout_width="match_parent"
       android:layout_height="50dp" />

    

你可能感兴趣的:(Android进阶--第三方插件LitePalFramework/LitePal)