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1.单表查询

 SysUser sysUser = QueryChain.of(sysUserMapper) .eq(SysUser::getId, 1) .eq(SysUser::getUserName,'admin') .get(); 

2.VO映射

 @Data @ResultEntity(SysUser.class) public class SysUserVo { private Integer id; private String userName; //字段名字不一样时 @ResultEntityField(property = "password") private String pwd; } 

 SysUserVO sysUserVO = QueryChain.of(sysUserMapper) .eq(SysUser::getId, 1) .eq(SysUser::getUserName,'admin') .returnType(SysUserVO.class) .list(); 

join 查询

 @Data @ResultEntity(SysUser.class) public class SysUserVo { private Integer id; private String userName; //字段名字不一样时 @ResultEntityField(property = "password") private String pwd; //映射一个对象 1对1 @NestedResultEntity(target = SysRole.class) prviate SysRole sysRole; //映射多个对象 1对多 @NestedResultEntity(target = SysRole.class) prviate List<SysRole> sysRoles; } 

 List<SysUserRoleVO> list = QueryChain.of(sysUserMapper) .from(SysUser.class) .join(SysUser.class, SysRole.class) .returnType(SysUserRoleVO.class) .list(); 

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例如

1 .多表join A内嵌B B内嵌C 都可以

2 .不使用join 使用@Fetch注解+fetchFilter方法实现 将A JOIN B 变成 query A + query B

3 .使用@Paging 注解 实现你的xml 自动分页

4 .使用SQL模板，让你ORM 更简单更容易扩展，再也不怕被框架限制了