multi-query does not support [use db;] syntax

[irene-coming]

version:5.6.29-dble-2.18.02.4-20180606044319

int status = mysql_query(test_conn,
                          "use mytest ; \
                          DROP TABLE IF EXISTS test_table;\
                          CREATE TABLE test_table(id INT);\
                          INSERT INTO test_table VALUES(10);\
                          INSERT INTO test_table VALUES(20);\
                          INSERT INTO test_table VALUES(30);\
                          UPDATE test_table SET id=20 WHERE id=10;\
                          SELECT * FROM test_table;");

the above query will got err:
Unknown database 'mytest; DROP TABLE IF EXISTS test_table; CREATE TABLE test_table(id INT); INSERT INTO test_table VALUES(10); INSERT INTO test_table VALUES(20); INSERT INTO test_table VALUES(30); UPDATE test_table SET id=20 WHERE id=10; SELECT * FROM test_table'

complete c++ code for testing:

mysql_real_connect.txt
(change name post .txt to .cpp)
compile example:
g++ -g -o multiQuery.o -L/usr/local/mysql/lib -I/usr/local/mysql/include -lmysqlclient mysql_real_connect.cpp

[irene-coming]

dble version:5.6.29-dble-2.18.02.4-20180611104156
前置：

    <schema dataNode="dn1" name="mytest" sqlMaxLimit="100">
        <table dataNode="dn1,dn3" name="test" type="global"/>
    </schema>

steps: execute the following 2 sqls in order

char sqls[] = "use mytest; \
                          DROP TABLE IF EXISTS test_table;\
                          CREATE TABLE test_table(id INT);\
                          begin; \
                          INSERT INTO test_table VALUES(10);\
                          INSERT INTO test_table VALUES(20);\
                          commit;";

    char sqls2[] = "lock tables test_table write; \
                          UPDATE test_table SET id=20 WHERE id=10;\
                          unlock tables; \
                          start transaction; \
                          INSERT INTO test_table VALUES(30);\
                          rollback; \
                          --i am comment; \
                          SELECT * FROM test_table/* comment */";

then dble will get err at "lock tables test_table write;", err msg:Err, can't find table define of test_table in schema:mytest

c++ test file:
mysql_real_connect.txt