FlexSQL 安卓版，无需写 SQL 语句的 ORM，自动同步表结构
FlexSQL For Android 1.引入Gradle依赖 implementation 'cn.vonce:flexsql-android:1.7.0' annotationProcessor 'cn.vonce:flexsql-android:1.7.0' 2.标注实体类 //实体类基类 @Data public class BaseEntity { @SqlId(type = IdType.SNOWFLAKE_ID_16) @SqlColumn(notNull = true, remarks = "唯一id")//字段不能为null,表字段注释 private Long id; @SqlColumn(remarks = "创建者")//表字段注释 private Long creator; @SqlDefaultValue(with = FillWith.INSERT) @SqlColumn(remarks = "创建时间")//表字段注释 private Date createTime; @SqlColumn(remarks = "更新者")//表字段注释 private Long updater; @SqlDefaultValue(with = FillWith.UPDATE) @SqlColumn(remarks = "更新时间")//表字段注释 private Date updateTime; @SqlLogically @SqlColumn(remarks = "是否删除(0正常 1删除)")//表字段注释 private Boolean deleted; } //构建项目（Rebuild Project）后会根据实体类生成字段常量，例如User类生成的常量类是User$，例如获取id字段是User$.id$ @Data //autoAlter设置为true，实体类有变动时自动同步表结构 @SqlTable(autoAlter = true, value = "t_user", remarks = "用户") public class User extends BaseEntity { @SqlColumn(notNull = true, remarks = "用户名")//字段不能为null,表字段注释 private String userName; @SqlColumn(remarks = "姓名")//表字段注释 private String nickName; @SqlColumn(notNull = true, remarks = "手机号码")//表字段注释 private String mobilePhone; @SqlColumn(notNull = true, remarks = "密码")//表字段注释 private String password; @SqlColumn(notNull = true, remarks = "性别")//表字段注释 private Integer gender; @SqlColumn(remarks = "年龄")//表字段注释 private Integer age; @SqlColumn(remarks = "电子邮箱")//表字段注释 private String email; @SqlColumn(remarks = "头像", oldName = "head_portrait")//表字段注释,修改表字段名称需要在oldName指定旧的名称 private String avatar; @SqlDefaultValue(with = FillWith.INSERT) @SqlColumn(notNull = true, remarks = "状态(0正常 1停用)")//字段不能为null,表字段注释 private UserStatus status; } 3.获取连接（建议在上一步把所有表字段关系建立好，第一次获取连接时会自动创建表结构） public class MainActivity extends AppCompatActivity { private SqlBeanHelper<Essay, String> essaySqlBeanHelper; //private SqlBeanHelper<User, String> userSqlBeanHelper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //方式一，单库模式 SQLiteHelper.init(this, "testdb", 1);//建议放在MainActivity或继承的Application essaySqlBeanHelper = SQLiteHelper.db().get(Essay.class); //方式二，多库模式 //essaySqlBeanHelper = SQLiteHelper.db(this, "testdb1", 1).get(Essay.class); //userSqlBeanHelper = SQLiteHelper.db(this, "testdb2", 1).get(User.class); } } 4.CRUD操作 public class MainActivity extends AppCompatActivity { private SqlBeanHelper<Essay, String> sqlBeanHelper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); SQLiteHelper.init(this, "testdb", 1); sqlBeanHelper = SQLiteHelper.db().get(Essay.class); } //查询 public void select() { //查询列表 List<User> list = userService.select(); list = sqlBeanHelper.selectBy(Wrapper.where(Cond.gt(User$.id$, 10)).and(Cond.lt(User$.id$, 20))); //指定查询 list = sqlBeanHelper.select(new Select().column(User$.id$, User$.user_name$, User$.mobile_phone$).where().gt(User$.id$, 10)); //查询一条 User user = sqlBeanHelper.selectById(1L); user = sqlBeanHelper.selectOneBy(Wrapper.where(eq(User$.id$, 1001))); //sql语义化查询《20岁且是女性的用户根据创建时间倒序，获取前10条》 list = sqlBeanHelper.select(new Select().column(User$.id$, User$.user_name$, User$.mobile_phone$).where().eq(User$.age$, 20).and().eq(User$.gender$, 0).back().orderByDesc(User$.create_time$).page(0, 10)); //联表查询《广州或深圳的18岁的女性用户，根据创建时间倒序，查询前10条用户的信息和地址》 Select select = new Select(); select.column(User$.id$, User$.user_name$, User$.mobile_phone$, UserAddress$.province$, UserAddress$.city$, UserAddress$.area$, UserAddress$.details$); select.innerJoin(UserAddress.class).on().eq(UserAddress$.id$, User$.id$); select.where().eq(User$.age$, 18).and().eq(User$.gender$, 0).and(condition -> condition.eq(UserAddress$.city$, "广州").or().eq(UserAddress$.city$, "深圳")); select.orderByDesc(User$.create_time$); select.page(0, 10); //查询Map Map<String, Object> map = sqlBeanHelper.selectMap(select); List<Map<String, Object>> mapList = sqlBeanHelper.selectMapList(select); } //分页 public void getPageList() { // 查询对象 Select select = new Select(); PageHelper<User> pageHelper = new PageHelper<>(0, 10); pageHelper.paging(select, sqlBeanHelper); ResultData<List<Essay>> data = pageHelper.getResultData(); } //统计（函数使用） public void getStatistics() { Select select = new Select(); select.column(SqlFun.count(User$.id$), "count").column(SqlFun.avg(User$.age$)); select.where().gt(SqlFun.date_format(User$.create_time$, "%Y-%m-%d"), "2024-06-24"); select.groupBy(User$.gender$); select.orderByDesc("count"); List<Map<String, Object>> mapList = sqlBeanHelper.selectMapList(select); } //更新 public void update(Essay essay) { //根据bean内部id更新 long i = sqlBeanHelper.updateByBeanId(essay); //根据外部id更新 //i = sqlBeanHelper.updateById(essay, 20); //根据条件更新 //i = sqlBeanHelper.update(new Update<User>().set(User$.gender$, 1).set(User$.name$, "Jovi").setAdd(User$.age$, User$.age$, 1).where().eq(User$.id$, 111).back()); } //删除 public void deleteById(String[] id) { //根据id删除 long i = sqlBeanHelper.deleteById(id); //根据条件删除 //i = sqlBeanHelper.deleteBy(Wrapper.where(gt(User$.age$, 22)).and(eq(User$.gender$, 1))); } //插入 public void add() { List<Essay> essayList = new ArrayList<>(); for (int i = 0; i < 100; i++) { Essay essay = new Essay(i, "name" + i); essayList.add(essay); } sqlBeanHelper.insert(essayList); } }
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