ForeignKey 外键注解（已不推荐，现有更好的方式表达JOIN）

说明

作用：就是在连表时，可是不用写ON 条件，框架自动添加ON条件

如何用？

@Data
@Table 
public class SysUser {

    @TableId
    private Integer id;

    private String userName;

    private String password;

    @ForeignKey(SysRole.class)
    private Integer roleId;

    private LocalDateTime createTime;
}

public class Demo {
    @Autowired
    private SysUserMapper sysUserMapper;

    public void page() {
        Pager<SysUser> pager= QueryChain.of(sysUserMapper)
                .select(SysUser.class)
                .from(SysUser.class)
                .join(SysUser.class,SysRole.class)
                .like(SysUser::getUserName,"abc")
                .returnType(SysUser.class)
                .paging(Pager.of(1));
    }
}

不加此注解的话 需要 ：

join(SysUser.class,SysRole.class,on -> on.eq(SysUser::getRoleId, SysRole::getId))