[dbstmt] retrieve data when SQLFetch return SQL_SUCCESS_WITH_INFO

[dmabupt]

Signed-off-by: mengxumx mengxumx@cn.ibm.com

Related issue: #68 @jasonclake

• If SQLExecDirect() return SQL_SUCCESS_WITH_INFO, it means the data is not in the query result set, we need to fetch it by ourselves.
• If SQLFetch() return SQL_SUCCESS_WITH_INFO, currently I just treat it the same as SQL_SUCCESS and retrieve the data directly.

Test result seems OK --

-bash-4.4$ node idb-fetch-withinfo.js
This works---------------------------------------------
sql: select name
    , sum(case hasSpecAttr when '1' then 1 else 0 end) cnt
    from xumeng.article
    group by name
result: [
  {
    "NAME": "Article1            ",
    "CNT": "1"
  }
]
error: null
This does NOT work---------------------------------------------
sql: select name
    , count(case hasSpecAttr when '1' then 1 else null end) cnt
    from xumeng.article
    group by name
result: [
  {
    "NAME": "Article1            ",
    "CNT": "1"
  }
]
error: null