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);     }  }