trafodion-codereview mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From SuJinpei <...@git.apache.org>
Subject [GitHub] incubator-trafodion pull request #1237: [TRAFODION-2726] odb support to load...
Date Mon, 18 Sep 2017 07:36:05 GMT
GitHub user SuJinpei opened a pull request:

    https://github.com/apache/incubator-trafodion/pull/1237

    [TRAFODION-2726] odb support to load json file

    **1. Why support json?**
        1. custormer needed.
        2. JSON is a data inter-exchange format. When compared to XML, it is very lightweight
and more human-readable.
    
    **2. Why not use existing c json lib?**
        Considered using the json-c and json-glibc, but seems neither them support stream
parse.  For a large file, the memory may not enough.
    
    **3. How odb support json loading function?**
       1. Create table tbjson(id int, name char(20));
       2. cat test.json
           {
              "test":[
                  { "id":1 , "name":"hello" },
                  { "id":2 , "name":"world" },
              ]
          }
       3.
          `./odb64luo -l src=test.json:tgt=tbjson:jsonkey=test
    odb [parseopt(14249)] - Warning: this function is not fully tested "jsonkey"
    odb [2017-09-18 15:28:39]: starting ODBC connection(s)... 0
    Connected to Trafodion
    [0] 2 records inserted [commit]
    [0] odb version 1.1.0 Load(X) statistics:
            [0] Target table: (null).(null).TBJSON
            [0] Source: test.json
            [0] Pre-loading time: 0.308 s (00:00:00.308)
            [0] Loading time: 0.021 s(00:00:00.021)
            [0] Total records read: 0
            [0] Total records inserted: 2
            [0] Total number of columns: 2
            [0] Average input row size: NaN B
            [0] ODBC row size: 31 B (data) + 16 B (len ind)
            [0] Rowset size: 100
            [0] Rowset buffer size: 4.59 KiB
            [0] Load throughput (real data): 0.000 KiB/s
            [0] Load throughput (ODBC): 2.883 KiB/s
    odb [2017-09-18 15:28:39]: exiting. Session Elapsed time 0.338 seconds (00:00:00.338)
    -bash-4.1$ ./odb64luo -x "select * from tbjson"   
    odb [2017-09-18 15:29:28]: starting ODBC connection(s)... 0
    1,hello               
    2,world               
    [0.0.0]--- 2 row(s) selected in 0.025s (prep 0.006s, exec 0.008s, fetch 0.011s/0.006s)
    odb [2017-09-18 15:29:28]: exiting. Session Elapsed time 0.284 seconds (00:00:00.284)`


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/SuJinpei/incubator-trafodion trafodion-2726

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-trafodion/pull/1237.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1237
    
----

----


---

Mime
View raw message