Mybatis-Flex 第一个版本发布，一个优雅的 Mybatis 增强框架。
特征
1、很轻量，整个框架只依赖 Mybatis 再无其他第三方依赖
2、Entity 类的基本增删改查、以及分页查询
3、Row 通用映射支持，可以无需实体类对数据库进行增删改查
4、支持多种数据库类型，自由通过方言持续扩展
5、支持联合主键，以及不同的主键内容生成策略
6、极其友好的 SQL 联动查询，IDE 自动提示不再担心出错
7、更多小惊喜
hello world
第一步：编写 Entity 实体类
@Table("tb_account"public class Account { @Id(private Long id;private String userName;private Date birthday;private int sex; //getter setter }
第二步，编写 Mapper 类，并继承 BaseMapper
public interface AccountMapper extends BaseMapper<Account> { //只需定义 Mapper 接口即可，可以无任何内容。 }
第三步：开始查询数据
示例 1：查询 1 条数据
class HelloWorld {public static void main(String... args {HikariDataSource dataSource = new HikariDataSource(; dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex"; dataSource.setUsername("username"; dataSource.setPassword("password";MybatisFlexBootstrap.getInstance( .setDatasource(dataSource .addMapper(AccountMapper.class .start(; //示例1：查询 id=100 条数据Account account = MybatisFlexBootstrap.getInstance( .execute(AccountMapper.class, mapper -> mapper.selectOneById(100 ; } }
示例2：查询列表
class HelloWorld {public static void main(String... args {HikariDataSource dataSource = new HikariDataSource(; dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex"; dataSource.setUsername("username"; dataSource.setPassword("password";MybatisFlexBootstrap.getInstance( .setDatasource(dataSource .addMapper(AccountMapper.class .start(; //示例2：通过 QueryWrapper 构建条件查询数据列表QueryWrapper query = QueryWrapper.create( .select( .from(ACCOUNT .where(ACCOUNT.ID.ge(100 .and(ACCOUNT.USER_NAME.like("张".or(ACCOUNT.USER_NAME.like("李"; // 执行 SQL： // ELECT * FROM `tb_account` // WHERE `tb_account`.`id` >= 100 // AND (`tb_account`.`user_name` LIKE '%张%' OR `tb_account`.`user_name` LIKE '%李%' List<Account> accounts = MybatisFlexBootstrap.getInstance( .execute(AccountMapper.class, mapper -> mapper.selectListByQuery(query ; } }
示例3：分页查询
class HelloWorld {public static void main(String... args {HikariDataSource dataSource = new HikariDataSource(; dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex"; dataSource.setUsername("username"; dataSource.setPassword("password";MybatisFlexBootstrap.getInstance( .setDatasource(dataSource .addMapper(AccountMapper.class .start(; // 示例3：分页查询 // 查询第 5 页，每页 10 条数据，通过 QueryWrapper 构建条件查询QueryWrapper query = QueryWrapper.create( .select( .from(ACCOUNT .where(ACCOUNT.ID.ge(100 .and(ACCOUNT.USER_NAME.like("张".or(ACCOUNT.USER_NAME.like("李" .orderBy(ACCOUNT.ID.desc(; // 执行 SQL： // ELECT * FROM `tb_account` // WHERE `tb_account`.`id` >= 100 // AND (`tb_account`.`user_name` LIKE '%张%' OR `tb_account`.`user_name` LIKE '%李%' // ORDER BY `tb_account`.`id` DESC // LIMIT 40,10Page<Account> accounts = MybatisFlexBootstrap.getInstance( .execute(AccountMapper.class, mapper -> mapper.paginate(5, 10, query ; } }
QueryWrapper 示例
select *
QueryWrapper query=new QueryWrapper(;
query.select(.from(ACCOUNT
// SQL:
// SELECT * FROM tb_accountselect columns
QueryWrapper query=new QueryWrapper(;
query.select(ACCOUNT.ID,ACCOUNT.USER_NAME.from(ACCOUNT
// SQL:
// SELECT tb_account.id, tb_account.user_name
// FROM tb_accountQueryWrapper query=new QueryWrapper(;
query.select(ACCOUNT.ALL_COLUMNS.from(ACCOUNT
// SQL:
// SELECT tb_account.id, tb_account.user_name, tb_account.birthday,
// tb_account.sex, tb_account.is_normal
// FROM tb_accountselect functions
QueryWrapper query=new QueryWrapper(
.select(ACCOUNT.ID
,ACCOUNT.USER_NAME
,max(ACCOUNT.BIRTHDAY
,avg(ACCOUNT.SEX.as("sex_avg"
.from(ACCOUNT;
// SQL:
// SELECT tb_account.id, tb_account.user_name,
// MAX(tb_account.birthday,
// AVG(tb_account.sex AS sex_avg
// FROM tb_accountwhere
QueryWrapper queryWrapper=QueryWrapper.create(
.select(
.from(ACCOUNT
.where(ACCOUNT.ID.ge(100
.and(ACCOUNT.USER_NAME.like("michael";
// SQL:
// SELECT * FROM tb_account
// WHERE tb_account.id >= ?
// AND tb_account.user_name LIKE ?
exists, not exists
QueryWrapper queryWrapper=QueryWrapper.create(
.select(
.from(ACCOUNT
.where(ACCOUNT.ID.ge(100
.and(
exist(
selectOne(.from(ARTICLE.where(ARTICLE.ID.ge(100
;
// SQL:
// SELECT * FROM tb_account
// WHERE tb_account.id >= ?
// AND EXIST (
// SELECT 1 FROM tb_article WHERE tb_article.id >= ?
// and (... or (...
QueryWrapper queryWrapper=QueryWrapper.create(
.select(
.from(ACCOUNT
.where(ACCOUNT.ID.ge(100
.and(ACCOUNT.SEX.eq(1.or(ACCOUNT.SEX.eq(2
.or(ACCOUNT.AGE.in(18,19,20.or(ACCOUNT.USER_NAME.like("michael";
// SQL:
// SELECT * FROM tb_account
// WHERE tb_account.id >= ?
// AND (tb_account.sex = ? OR tb_account.sex = ?
// OR (tb_account.age IN (?,?,? OR tb_account.user_name LIKE ? group by
QueryWrapper queryWrapper=QueryWrapper.create(
.select(
.from(ACCOUNT
.groupBy(ACCOUNT.USER_NAME;
// SQL:
// SELECT * FROM tb_account
// GROUP BY tb_account.user_namehaving
QueryWrapper queryWrapper=QueryWrapper.create(
.select(
.from(ACCOUNT
.groupBy(ACCOUNT.USER_NAME
.having(ACCOUNT.AGE.between(18,25;
// SQL:
// SELECT * FROM tb_account
// GROUP BY tb_account.user_name
// HAVING tb_account.age BETWEEN ? AND ?jion
QueryWrapper queryWrapper = QueryWrapper.create(
.select(
.from(ACCOUNT
.leftJoin(ARTICLE.on(ACCOUNT.ID.eq(ARTICLE.ACCOUNT_ID
.where(ACCOUNT.AGE.ge(10;
// SQL:
// SELECT * FROM tb_account
// LEFT JOIN tb_article
// ON tb_account.id = tb_article.account_id
// WHERE tb_account.age >= ?
可能存在问题
如何通过实体类 Account.java 生成 QueryWrapper 所需要的 "ACCOUNT" 类 ?
答：通过开发工具构建项目（如下图），或者执行 maven 编译命令: mvn clean package
更多示例
1、Mybatis-Flex 原生（无其他依赖）
2、Mybatis-Flex with Spring
3、Mybatis-Flex with Spring boot