一款好的DAO层框架，往往会简化我们操作数据库的方式，开发人员在使用框架时直接调用封装好的API，还可以省去很多代码的编写工作，从而提高工作效率和开发速度。
小编过去已经接触并使用过了Mybatis-Plus和tk-Mapper，最近因为有些契机，想了解下比较轻量的MyBatis 增强框架，看了上面两个在非Spring下场景的用法，有点不太满意，这时候突然就看到了我们今天的主角Mybatis-Flex，仅仅依赖Mybatis的，它非常轻量、同时拥有极高的性能与灵活性。我们可以轻松的使用 Mybaits-Flex 链接任何数据库，其内置的 QueryWrapper亮点 帮助我们极大的减少了 SQL 编写的工作的同时，减少出错的可能性。
特征：
1、很轻量，整个框架只依赖 Mybatis 再无其他第三方依赖
2、只增强，支持 Entity 的增删改查、及分页查询，但不丢失 Mybatis 原有功能
3、Db + Row，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（Mybatis-Plus和tk-Mapper有的功能他基本都有）
对比：
接下来我们来写个小例子（两张一模一样的账户表，使用H2数据库（一款内存数据库，就比如我们这中写demo的场景没必要真的去装一个数据库来建个表，使用H2数据库可以简化非重要步骤））来演示下Mybatis-Flex是多么的轻量（无spring）和易用，以及展示部分功能：
引入pom文件：
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.example</groupId> <artifactId>mybatiesFlex</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> </properties> <dependencies> <dependency> <groupId>com.mybatis-flex</groupId> <artifactId>mybatis-flex-core</artifactId> <version>1.4.3</version> </dependency> <!--这个依赖只是为了使用 h2 数据源--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.3.25</version> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <version>1.4.199</version> </dependency> <dependency> <groupId>com.alibaba.fastjson2</groupId> <artifactId>fastjson2</artifactId> <version>2.0.26</version> </dependency> </dependencies> </project>
初始化表结构及数据的脚本：data.sql
CREATE TABLE IF NOT EXISTS `tb_account` ( `id` INTEGER PRIMARY KEY auto_increment, `user_name` VARCHAR(100), `age` Integer, `birthday` DATETIME, `options` VARCHAR(1024) ); CREATE TABLE IF NOT EXISTS `tb_account2` ( `id` INTEGER PRIMARY KEY auto_increment, `user_name` VARCHAR(100), `age` Integer, `birthday` DATETIME, `options` VARCHAR(1024) ); schema.sql CREATE TABLE IF NOT EXISTS `tb_account` ( `id` INTEGER PRIMARY KEY auto_increment, `user_name` VARCHAR(100), `age` Integer, `birthday` DATETIME, `options` VARCHAR(1024) ); CREATE TABLE IF NOT EXISTS `tb_account2` ( `id` INTEGER PRIMARY KEY auto_increment, `user_name` VARCHAR(100), `age` Integer, `birthday` DATETIME, `options` VARCHAR(1024) ); 配置文件：mybatis-flex.config processor.mappersGenerateEnable = false
表映射对象：Account
package com.mybatisflex.test; import com.mybatisflex.annotation.*; import com.mybatisflex.core.handler.Fastjson2TypeHandler; import com.mybatisflex.core.mask.Masks; import java.util.Date; import java.util.HashMap; import java.util.Map; @Table(value = "tb_account",dataSource = "ds2") public class Account { @Id(keyType = KeyType.Auto) private Long id; @ColumnMask(Masks.CHINESE_NAME) private String userName; private int age; private Date birthday; @Column(typeHandler = Fastjson2TypeHandler.class) private Map<String, Object> options; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Map<String, Object> getOptions() { return options; } public void setOptions(Map<String, Object> options) { this.options = options; } public void addOption(String key, Object value) { if (options == null) { options = new HashMap<>(); } options.put(key, value); } @Override public String toString() { return "{" + "id=" + id + ", userName='" + userName + '\'' + ", age=" + age + ", birthday=" + birthday + ", options=" + options + '}'; } } Account2 package com.mybatisflex.test; import com.mybatisflex.annotation.*; import com.mybatisflex.core.handler.Fastjson2TypeHandler; import com.mybatisflex.core.mask.Masks; import java.util.Date; import java.util.HashMap; import java.util.Map; @Table(value = "tb_account2",dataSource = "ds2") public class Account2 { @Id(keyType = KeyType.Auto) private Long id; @ColumnMask(Masks.CHINESE_NAME) private String userName; private int age; private Date birthday; @Column(typeHandler = Fastjson2TypeHandler.class) private Map<String, Object> options; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Map<String, Object> getOptions() { return options; } public void setOptions(Map<String, Object> options) { this.options = options; } public void addOption(String key, Object value) { if (options == null) { options = new HashMap<>(); } options.put(key, value); } @Override public String toString() { return "{" + "id=" + id + ", userName='" + userName + '\'' + ", age=" + age + ", birthday=" + birthday + ", options=" + options + '}'; } }
例子用到的非表对象Account3：
package com.mybatisflex.test; public class Account3 { private String userName3; private int age; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getUserName3() { return userName3; } public void setUserName3(String userName3) { this.userName3 = userName3; } @Override public String toString() { return "Account3{" + "userName3='" + userName3 + '\'' + ", age=" + age + '}'; } }
表对应的mapper：AccountMapper
package com.mybatisflex.test; import com.mybatisflex.core.BaseMapper; import org.apache.ibatis.annotations.Param; import org.apache.ibatis.annotations.Select; public interface AccountMapper extends BaseMapper<Account> { @Select("select * from tb_account where id = #{id}") Account selectById(@Param("id") Integer id); } Account2Mapper package com.mybatisflex.test; import com.mybatisflex.core.BaseMapper; public interface Account2Mapper extends BaseMapper<Account2>
