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LitePal ORM数据库管理指南

1. ORM映射配置

LitePal采用对象关系映射（ORM）模式，需要配置映射模型。具体操作如下：

通过上述配置，指定Book类映射数据库表book。

2. 数据库版本管理

数据库版本号的修改非常简单，只需在版本号字段加1即可：

此时数据库将自动生成新版本，确保迁移稳定。

3. 数据表操作

在LitePal中，进行增删改查操作需要继承DataSupport类：

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button createDatabase = (Button) findViewById(R.id.create_database);        createDatabase.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                LitePal.getDatabase();            }        });        Button addData = (Button) findViewById(R.id.add_data);        addData.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Book book = new Book();                book.setName("java编程思想");                book.setAuthor("dan brown");                book.setPages(500);                book.setPress("unkonw");                book.setPrice(50.2);                book.save();            }        });        Button updateData = (Button) findViewById(R.id.update_data);        updateData.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Book book = new Book();                book.setName("java入门到精通");                book.setAuthor("dan brown");                book.setPages(50);                book.setPress("unkonw");                book.setPrice(55.2);                book.save();                book.setPrice(100.2);                book.save();            }        });        Button deleteData = (Button) findViewById(R.id.delete_data);        deleteData.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                DataSupport.deleteAll(Book.class, "price > ?", "90");            }        });        Button queryData = (Button) findViewById(R.id.query_data);        queryData.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                List
   
     books = DataSupport.findAll(Book.class);                for (Book book : books) {                    Log.d("Mainactivity", "book name is:" + book.getName());                    Log.d("Mainactivity", "book author is:" + book.getAuthor());                    Log.d("Mainactivity", "book pages is:" + book.getPages());                    Log.d("Mainactivity", "book price is:" + book.getPrice());                    Log.d("Mainactivity", "book press is:" + book.getPress());                }            }        });    }}
   

4. 常见操作示例

增加数据

Book book = new Book();book.setName("java编程思想");book.setAuthor("dan brown");book.setPages(500);book.setPress("unkonw");book.setPrice(50.2);book.save();

更新数据

Book book = new Book();book.setPrice(132.5);book.setAuthor("anchor");book.updateAll("name = ? and author = ?", "java入门到精通", "dan brown");

删除数据

DataSupport.deleteAll(Book.class, "price > ?", "90");

查询数据

List
   
     books = DataSupport.findAll(Book.class);for (Book book : books) {    Log.d("Mainactivity", "book name is:" + book.getName());    Log.d("Mainactivity", "book author is:" + book.getAuthor());    Log.d("Mainactivity", "book pages is:" + book.getPages());    Log.d("Mainactivity", "book price is:" + book.getPrice());    Log.d("Mainactivity", "book press is:" + book.getPress());}
   

通过以上方法，轻松管理Android应用中的数据库，充分发挥LitePal ORM的优势。