fix #78 use space and gql are executed together incorrect in 3.3.0

[CorvusYe]

@llinzhe
When switch space is required, will execute twice ,
one is USE space , another is normal nGQL

[llinzhe]

@llinzhe When switch space is required, will execute twice , one is USE space , another is normal nGQL

Great feeling for your prompt response and repair！

[CorvusYe]

May need your help with further testing. I'm using 3.2.0 now.

[CorvusYe]

If things go well, the merge will automatically release a snapshot version tomorrow.

[llinzhe]

If things go well, the merge will automatically release a snapshot version tomorrow.
I'll test it with a snapshot version, in the nebula 3.3 environment

[Nicole00]

I prefer to execute USE space after each request. In resultSet of execution's response, there's space name for current session, and we can decide whether need to change the space back.

If execute USE space before request, there will be some useless operations, ge:
Local session's current space is test, and user's request is "use test1; show hosts; use test" , and there is no need to pre-execute a use test1 operation.

[CorvusYe]

In this case, you are right.

And we should consider another situation, for example there are two DAO:

<mapper namespace="Test1Dao" space="test1">

    <select id="useCurrentSpace" >
         RETURN 'useCurrentSpace';
    </select>

    <select id="useTestSpace" space="test">
         RETURN 'useTestSpace';
    </select>

    <select id="useSpaceInner">
         USE test;
         RETURN 'useSpaceInner';
    </select>
    
</mapper>


<mapper namespace="DefaultSpaceInYmlDao"> <!-- default space is `test`-->
    
    <select id="normalInvoke">
         RETURN 'normalInvoke';
    </select>

</mapper>

    @Autowired private Test1Dao test1Dao;
    @Autowired private DefaultSpaceInYmlDao defaultSpaceDao;
    
    public void biz() {
        test1Dao.useCurrentSpace(); // when this session is use in first time, space is null, so need to specify the space
        // USE test1;
        // RETURN 'useCurrentSpace';

        test1Dao.useCurrentSpace(); // local session keep the last space, so this time is unnecessary to switch
        // RETURN 'useCurrentSpace';

        test1Dao.useTestSpace(); // catching the space is difference from local session.
        // USE test;
        // RETURN 'useTestSpace';

        defaultSpaceDao.normalInvoke(); 
        // RETURN 'normalInvoke';

        test1Dao.useTestSpace();
        // RETURN 'useTestSpace';

        test1Dao.useSpaceInner(); // This usage #78 may happend again, because we can not control how ngql will be written
        // USE test; RETURN 'useSpaceInner'; 
    }

Let's assume that only one session is in use.
In this case 6 times invoked, we costs 8 times request. not 12 times.

Ngbatis recommends declaring spaces in xml tags.

And you reminded me that we can get current session space from ResultSet insteads of RegExp.

[llinzhe]

May need your help with further testing. I'm using 3.2.0 now.

I passed the test in 3.3.0 environment

[CorvusYe]

May need your help with further testing. I'm using 3.2.0 now.

I passed the test in 3.3.0 environment

Thanks a lot.