游标cursor查询(query cursor) 
Mapper 内置方法 
- cursor(Where):动态条件,游标查询
动态where查询 
java
public class Demo {
    @Autowired
    private SysUserMapper sysUserMapper;
    
    public void cursor() {
        Cursor<SysUser> cursor= sysUserMapper.cursor(where->{
           where.like(SysUser::getUserName,"abc");
       });
    }
}基于QueryChain(强大) 
可构建复杂的场景 链路查询 - QueryChain !
java
public class Demo {
    @Autowired
    private SysUserMapper sysUserMapper;
    public void cursor() {
        Cursor<SysUser> cursor= QueryChain.of(sysUserMapper)
                .like(SysUser::getUserName,"abc")
                .limit(10)
                .cursor();
    }
}