Android ORMLite框架是开发者在Android平台上进行数据库操作的一个便捷工具,它简化了与SQLite数据库交互的复杂性,使得数据库的增删改查等操作变得简单直观。本教程将通过一个入门实例Demo来介绍ORMLite的基本用法,帮助开发者快速上手。 一、ORMLite简介 ORMLite(Object-Relational Mapping Lite)是一个轻量级的ORM库,它允许开发者通过Java对象直接操作数据库表,避免了手动编写SQL语句的繁琐过程。在Android开发中,ORMLite提供了一套完整的API,包括数据访问对象(DAO)接口、实体类注解以及事务管理等功能。 二、安装与配置 要在项目中使用ORMLite,首先需要在build.gradle文件中添加依赖。目前,ORMLite已不再通过Maven仓库提供,而是直接在项目中引入jar包。将ormlite-android和ormlite-core两个库的jar文件复制到项目的libs目录下,然后在build.gradle文件中添加如下代码: ```groovy dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) } ``` 三、创建实体类 在ORMLite中,每个数据库表对应一个Java实体类。例如,假设我们有一个User表,可以创建一个名为User的Java类,并使用ORMLite的注解进行配置: ```java import com.j256.ormlite.field.DatabaseField; import com.j256.ormlite.table.DatabaseTable; @DatabaseTable(tableName = "User") public class User { @DatabaseField(generatedId = true) private int id; @DatabaseField private String name; @DatabaseField private String email; // 构造函数、getter和setter方法 } ``` 四、配置数据库Helper 创建一个继承自ORMLite提供的`OrmLiteSqliteOpenHelper`的类,用于初始化数据库和版本管理: ```java import com.j256.ormlite.database.DatabaseHelper; import com.j256.ormlite.support.ConnectionSource; import com.j256.ormlite.table.TableUtils; import android.content.Context; import android.database.sqlite.SQLiteDatabase; public class DatabaseHelper extends OrmLiteSqliteOpenHelper { private static final String DATABASE_NAME = "UserDB"; private static final int DATABASE_VERSION = 1; public DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db, ConnectionSource connectionSource) { try { TableUtils.createTable(connectionSource, User.class); } catch (SQLException e) { e.printStackTrace(); } } @Override public void onUpgrade(SQLiteDatabase db, ConnectionSource connectionSource, int oldVersion, int newVersion) { try { TableUtils.dropTable(connectionSource, User.class, true); onCreate(db, connectionSource); } catch (SQLException e) { e.printStackTrace(); } } } ``` 五、使用DAO进行操作 DAO(Data Access Object)是ORMLite的核心,它提供了对数据库表的基本操作。为User类创建一个DAO接口: ```java import com.j256.ormlite.dao.Dao; import com.j256.ormlite.stmt.QueryBuilder; import java.sql.SQLException; import java.util.List; public interface UserDao extends Dao<User, Integer> { List<User> getAllUsers(); User getUserByName(String name); void addUser(User user); void updateUser(User user); void deleteUser(User user); } ``` 接着,在需要使用数据库的地方,获取DAO实例并执行操作: ```java import com.j256.ormlite.dao.CloseableIterator; import com.j256.ormlite.stmt.PreparedQuery; import com.j256.ormlite.stmt.Where; DatabaseHelper dbHelper = new DatabaseHelper(this); UserDao userDao = dbHelper.getUserDao(); // 添加用户 User user = new User("John Doe", "john.doe@example.com"); userDao.add(user); // 查询所有用户 CloseableIterator<User> users = userDao.queryForAllIterator(); while (users.hasNext()) { User user = users.next(); Log.d("User", user.getName()); } // 更新用户 Where<User, Integer> query = userDao.queryBuilder().where().eq("name", "John Doe"); PreparedQuery<User> preparedQuery = query.prepare(); User johnDoe = userDao.queryForFirst(preparedQuery); johnDoe.setEmail("new.email@example.com"); userDao.update(johnDoe); // 删除用户 userDao.delete(johnDoe); // 关闭数据库连接 dbHelper.close(); ``` 六、事务管理 ORMLite还支持事务处理,可以在一组操作中确保数据的一致性: ```java try { dbHelper.getDatabaseConnection().startTransaction(); // 在这里执行一系列操作,如添加、更新或删除 // 如果所有操作都成功,提交事务 dbHelper.getDatabaseConnection().commit(); } catch (SQLException e) { // 如果发生异常,回滚事务 dbHelper.getDatabaseConnection().rollback(); e.printStackTrace(); } ``` 七、总结 Android ORMLite框架通过简化数据库操作,提高了开发效率。通过定义实体类、创建数据库Helper、使用DAO接口,我们可以轻松地完成数据的增删改查。在实际项目中,可以根据需求进一步学习和应用ORMLite的高级特性,如查询构造器、字段映射、自定义SQL等,以实现更复杂的数据库操作。通过OrmliteDemo,开发者可以快速掌握这些基本概念和用法,为实际项目打下坚实基础。
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![pdf](https://img-home.csdnimg.cn/images/20241231044930.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![application/octet-stream](https://img-home.csdnimg.cn/images/20210720083646.png)
![pdf](https://img-home.csdnimg.cn/images/20241231044930.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![zip](https://img-home.csdnimg.cn/images/20241231045053.png)
![rar](https://img-home.csdnimg.cn/images/20241231044955.png)
![package](https://csdnimg.cn/release/downloadcmsfe/public/img/package.f3fc750b.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/JAR.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/JAR.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/JAR.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/TXT.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/TXT.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/JAR.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/JAR.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/JAR.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/PNG.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
- 1
![avatar](https://profile-avatar.csdnimg.cn/907ebd0daa4e484fb9a8b5ef2d284f6e_su_tianbiao.jpg!1)
- 粉丝: 61
- 资源: 22
我的内容管理 展开
我的资源 快来上传第一个资源
我的收益
登录查看自己的收益我的积分 登录查看自己的积分
我的C币 登录后查看C币余额
我的收藏
我的下载
下载帮助
![voice](https://csdnimg.cn/release/downloadcmsfe/public/img/voice.245cc511.png)
![center-task](https://csdnimg.cn/release/downloadcmsfe/public/img/center-task.c2eda91a.png)
最新资源
- Matlab机械臂七次B样条轨迹规划程序:带速度加速度约束的八个点优化解决方案,基于NSGA-II遗传算法的时间、能量、冲击最优策略,Matlab机械臂七次B样条轨迹规划程序:带速度加速度约束的八个点
- 基于MATLAB的交流电机动态分析程序:输入参数预测转速与力矩变化,基于MATLAB的交流电机动态方程分析与模拟程序:输入参数预测转速、力矩变化,基于matlab的交流电机动态方程,用于交流电机动态分
- 21个直播间礼物svga资源
- COMSOL模拟锌离子电池:锌离子沉积浓度场的源文件解析,深入探究COMSOL模拟锌离子电池中锌离子沉积浓度场源文件的技术与应用,comsol模拟锌离子电池锌离子沉积浓度场源文件 ,comsol模拟
- 多策略增强版三角拓扑聚合优化器-基于数学模型的连续优化与工程应用优化器的新发展,基于多策略改进的三角拓扑聚合优化器(ITTAO):一种数学启发式算法,解决连续优化问题与工程应用中的全局与局部最优平衡
- Simulink仿真模型光伏储能VSG与电容融合运行展示:波形完美展现光储一次调频、削峰填谷与直流母线电压控制功能,Simulink仿真模型下的光伏储能VSG运行及功能特点:光储一次调频、削峰填谷、直
- COMSOL电弧模拟与等离子体特性研究,COMSOL电弧模拟技术:探索等离子体行为与物理机制,comsol电弧模拟 等离子体 ,comsol电弧模拟; 等离子体模拟; 仿真建模; 物理现象模拟,COM
- 采用STC89C54RD设计的智能家居控制系统【含系统程序、系统PPT、设计报告、电路图等】
- MATLAB仿真的夫琅禾费衍射强度图:圆孔、圆环、矩形孔定制研究,MATLAB仿真:夫琅禾费衍射强度图的可定制性-以圆孔、圆环及矩形孔为例的研究分析,MATLAB夫琅禾费衍射强度图仿真 圆孔,圆环
- 基于CarSim与Matlab的ABS模糊控制策略联合仿真研究:优化制动效能与滑移率控制,汽车ABS模糊控制策略与逻辑门限值控制的联合仿真研究:提升制动效能与滑移率优化,基于CarSim和Matlab
- matlab实现FFT算法线性调频多目标仿真研究-LFM-FFT-目标识别-matlab
- COMSOL模拟锌离子电池锌负极电场模型教程:初学者友好版,附详细制作过程与多种模型源文件参考,COMSOL模拟锌离子电池锌负极电场模型源文件详解与教程:从初学者的角度出发,掌握电场模型制作全流程及多
- 30KW储能双向变流器PCS逆变器设计方案:高效能量转换与存储技术,优质高效 30KW储能PCS逆变器双向变流器设计方法与解析资料大全,30KW储能PCS逆变器双向变流器设计方案资料, ,核心关键词:
- 无感FOC技术解析:基于磁链观测器的零速带载闭环启动与力矩保持算法资料及MDK项目源码详解,无感FOC算法资料:磁链观测器、零速带载闭环启动、堵转力矩保持与直接正反转控制技术详解-含Cubemx配置
- AC DC DC模拟EV充电仿真系统:前后级交错PFC Boost与移相全桥隔离技术实现与matlab Simulink环境下模拟实践,AC DC转换与DC模拟EV充电仿真:PFC Boost与移相全
- matlab实现FXLMS主动噪声控制算法研究-自适应滤波器-噪声污染-噪音消除-matlab
![feedback](https://img-home.csdnimg.cn/images/20220527035711.png)
![feedback-tip](https://img-home.csdnimg.cn/images/20220527035111.png)
![dialog-icon](https://csdnimg.cn/release/downloadcmsfe/public/img/green-success.6a4acb44.png)
- 1
- 2
前往页