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Posted to issues@trafodion.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/09/18 07:37:00 UTC
[jira] [Commented] (TRAFODION-2726) odb support to load json file
[ https://issues.apache.org/jira/browse/TRAFODION-2726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16169696#comment-16169696 ]
ASF GitHub Bot commented on TRAFODION-2726:
-------------------------------------------
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
----
----
> odb support to load json file
> -----------------------------
>
> Key: TRAFODION-2726
> URL: https://issues.apache.org/jira/browse/TRAFODION-2726
> Project: Apache Trafodion
> Issue Type: New Feature
> Components: db-utility-odb
> Reporter: 苏锦佩
> Priority: Minor
> Fix For: 2.3-incubating
>
>
> json is popular data storage format, so we want to support it on odb.
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