数据库开源框架之ormlite

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主页: http://ormlite.com/

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配置: 添加以下依赖
* compile 'com.j256.ormlite:ormlite-android:4.48'
* compile 'com.j256.ormlite:ormlite-core:4.48'

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用途: 操作数据库

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使用步骤

1. 创建数据库表结构的实体类.示例代码:

//指定数据库表名
@DatabaseTable(tableName = "user")
public class User {

    创建主键
    @DatabaseField(generatedId = true)
    private int id;

    创建数据库的列
    @DatabaseField(columnName = "name")
    private String name;
    @DatabaseField(columnName = "age")
    private int age;
    @DatabaseField(columnName = "tel")
    private String tel;

    //java.lang.IllegalArgumentException: Can't find a no-arg constructor for class cn.loaderman.ormlite.User
    public User() {}

    public User(String name, int age, String tel) {
        this.name = name;
        this.age = age;
        this.tel = tel;
    }
} 

 2.创建OrmLiteSqliteOpenHelper的实现类.示例代码:

public class UserDBOpenHelper extends OrmLiteSqliteOpenHelper {
    /**
     * 构造方法
     * @param context
     *         上下文
     * @param databaseName
     *         数据库的名称
     * @param factory
     *         游标工厂
     * @param databaseVersion
     *         数据库版本
     */
    public OrmlitOpenHelper(Context context) {
        super(context, "user.db", null,1);
    }
    /**
     * 创建数据库的表
     */
    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource) {
        try {
            TableUtils.createTable(connectionSource,User.class);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    /**
     * 数据库升级调用
     */
    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource, int i, int i1) {
        try {
            TableUtils.dropTable(connectionSource,User.class,true);
            onCreate(sqLiteDatabase,connectionSource);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

 3. 获取数据库的DAO对象, 即可进行增删改查的操作.示例代码:

UserDBOpenHelper helper = new UserDBOpenHelper(this);
     Dao<User, Integer> dao =  helper.getUserDao();
     User user = new User("zhangsan", 12, "13212345678");
         // 增
       dao.create(user);
        // 改
        dao.updateRaw("update user set tel = '18882348888' where name = ?", new String[]{"zhangsan"});
        // 查
        List<User> list = dao.queryForAll();
        for(User user:list){
        System.out.println(user.toString());
        }
        // 删
        dao.deleteById(1);