I've an issue defining a query to get some data out of Cassandra in WSO2 DSS. The query (and the operation) itself is working but my problem is when I try to get a timestamp as a result.
I only get the date and the timezone (2017-01-11+0100) the time part is missing. I guess that this is somehow related on the mapping to dateTime xsdType that is not working correctly.
Did you already face this issue, and do you have a solution to get the timestamp?
Here is a query sample
<query id="getDataQuery" useConfig="CassandraDB">
<expression>SELECT ts,value FROM keyspace.ts_tp WHERE name = :name</expression>
<result element="result" rowName="data">
<element column="ts" name="ts" xsdType="dateTime"/>
<element column="value" name="value" xsdType="decimal"/>
</result>
<param name="name" paramType="SCALAR" sqlType="STRING"/>
</query>
Thanks
Seems to be an issue in dss dateTime mapping, I opened a Jira ticket @wso2 to be sure. In order to make my call return the right values I made the following (Warning painful solution :))
The query returns now the unix Timestamp in ms
<query id="getDataQuery" useConfig="CassandraDB">
<expression>SELECT unixTimestampOf(minTimeuuid(ts)) as dt,value FROM keyspace.ts_tp WHERE source = :source and name = :name and bucket = :bucket and ts >= :tsFrom and ts <= :tsTo</expression>
<result element="result" rowName="data">
<element column="dt" name="ts" xsdType="int"/>
<element column="value" name="value" xsdType="decimal"/>
</result>
<param name="source" paramType="SCALAR" sqlType="STRING"/>
<param name="name" paramType="SCALAR" sqlType="STRING"/>
<param name="bucket" paramType="SCALAR" sqlType="INTEGER"/>
<param name="tsFrom" paramType="SCALAR" sqlType="TIMESTAMP"/>
<param name="tsTo" paramType="SCALAR" sqlType="TIMESTAMP"/>
</query>
Once I get the result I apply an XSL transformation to compute the dates
<xsl:stylesheet exclude-result-prefixes="xsl soapenv" version="2.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output encoding="utf-8" indent="yes" method="xml" omit-xml-declaration="yes"/>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="dt">
<xsl:element name="ts">
<xsl:value-of select='xs:dateTime("1970-01-01T00:00:00") + . * xs:dayTimeDuration("PT0.001S")'/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
It needs to be tested with different time zones, and day light savings but it seems to be a working hack, waiting for the official fix.