[news.eclipse.birt] Re: Report parameters in XPath expressions

[Jason Weathersby <jasonweathersby@xxxxxxxxxx>]

Sebastian,

Add a beforeOpen script to the datasource with a value something like:
this.queryText = "table1#-TNAME-#table1#:#[/companies/company[@id='" + 
params["companyid"].value 
+"']/employee]#:#{id;STRING;/@id},{companyid;STRING;../@id}"

See attached example.  Modify the xml source to point at your xml.

Jason

<?xml version="1.0" encoding="UTF-8"?>
<report xmlns="http://www.eclipse.org/birt/2005/design"; version="3.2.17" 
id="1">
    <property name="createdBy">Eclipse BIRT Designer Version 
2.3.1.v20080911 Build &lt;2.3.1.v20080922-1151></property>
    <property name="units">in</property>
    <property name="iconFile">/templates/blank_report.gif</property>
    <property name="bidiLayoutOrientation">ltr</property>
    <parameters>
        <scalar-parameter name="companyid" id="11">
            <property name="valueType">static</property>
            <property name="dataType">string</property>
            <property name="paramType">simple</property>
            <property name="controlType">list-box</property>
            <property name="mustMatch">true</property>
            <property name="fixedOrder">true</property>
            <property name="defaultValue">c2</property>
            <property name="distinct">true</property>
            <structure name="format">
                <property name="category">Unformatted</property>
            </structure>
            <list-property name="selectionList">
                <structure>
                    <property name="value">c1</property>
                    <property name="label">company1</property>
                </structure>
                <structure>
                    <property name="value">c2</property>
                    <property name="label">company2</property>
                </structure>
            </list-property>
        </scalar-parameter>
    </parameters>
    <data-sources>
        <oda-data-source 
extensionID="org.eclipse.datatools.enablement.oda.xml" name="Data 
Source" id="6">
            <property name="FILELIST">C:\xfer\company.xml</property>
        </oda-data-source>
    </data-sources>
    <data-sets>
        <oda-data-set 
extensionID="org.eclipse.datatools.enablement.oda.xml.dataSet" 
name="Data Set1" id="10">
            <structure name="cachedMetaData">
                <list-property name="resultSet">
                    <structure>
                        <property name="position">1</property>
                        <property name="name">id</property>
                        <property name="dataType">string</property>
                    </structure>
                    <structure>
                        <property name="position">2</property>
                        <property name="name">companyid</property>
                        <property name="dataType">string</property>
                    </structure>
                </list-property>
            </structure>
            <property name="dataSource">Data Source</property>
            <method name="beforeOpen"><![CDATA[this.queryText = 
"table1#-TNAME-#table1#:#[/companies/company[@id='" + 
params["companyid"].value 
+"']/employee]#:#{id;STRING;/@id},{companyid;STRING;../@id}"]]></method>
            <list-property name="resultSet">
                <structure>
                    <property name="position">1</property>
                    <property name="name">id</property>
                    <property name="nativeName">id</property>
                    <property name="dataType">string</property>
                    <property name="nativeDataType">12</property>
                </structure>
                <structure>
                    <property name="position">2</property>
                    <property name="name">companyid</property>
                    <property name="nativeName">companyid</property>
                    <property name="dataType">string</property>
                    <property name="nativeDataType">12</property>
                </structure>
            </list-property>
            <property 
name="queryText">table0#-TNAME-#table0#:#[/companies/company/employee]#:#{id;STRING;/@id},{companyid;STRING;../@id}</property>
            <xml-property name="designerValues"><![CDATA[<?xml 
version="1.0" encoding="UTF-8"?>
<model:DesignValues 
xmlns:design="http://www.eclipse.org/datatools/connectivity/oda/design"; 
xmlns:model="http://www.eclipse.org/birt/report/model/adapter/odaModel";>
  <Version>1.0</Version>
  <design:ResultSets derivedMetaData="true">
    <design:resultSetDefinitions>
      <design:resultSetColumns>
        <design:resultColumnDefinitions>
          <design:attributes>
            <design:name>id</design:name>
            <design:position>1</design:position>
            <design:nativeDataTypeCode>12</design:nativeDataTypeCode>
            <design:precision>-1</design:precision>
            <design:scale>-1</design:scale>
            <design:nullability>Unknown</design:nullability>
          </design:attributes>
          <design:usageHints>
            <design:label>id</design:label>
            <design:formattingHints/>
          </design:usageHints>
        </design:resultColumnDefinitions>
      </design:resultSetColumns>
    </design:resultSetDefinitions>
  </design:ResultSets>
</model:DesignValues>]]></xml-property>
            <list-property name="privateDriverProperties">
                <ex-property>
                    <name>MAX_ROW</name>
                    <value>-1</value>
                </ex-property>
                <ex-property>
                    <name>XML_FILE</name>
                </ex-property>
            </list-property>
        </oda-data-set>
    </data-sets>
    <styles>
        <style name="crosstab" id="4">
            <property name="borderBottomColor">#CCCCCC</property>
            <property name="borderBottomStyle">solid</property>
            <property name="borderBottomWidth">1pt</property>
            <property name="borderLeftColor">#CCCCCC</property>
            <property name="borderLeftStyle">solid</property>
            <property name="borderLeftWidth">1pt</property>
            <property name="borderRightColor">#CCCCCC</property>
            <property name="borderRightStyle">solid</property>
            <property name="borderRightWidth">1pt</property>
            <property name="borderTopColor">#CCCCCC</property>
            <property name="borderTopStyle">solid</property>
            <property name="borderTopWidth">1pt</property>
        </style>
        <style name="crosstab-cell" id="5">
            <property name="borderBottomColor">#CCCCCC</property>
            <property name="borderBottomStyle">solid</property>
            <property name="borderBottomWidth">1pt</property>
            <property name="borderLeftColor">#CCCCCC</property>
            <property name="borderLeftStyle">solid</property>
            <property name="borderLeftWidth">1pt</property>
            <property name="borderRightColor">#CCCCCC</property>
            <property name="borderRightStyle">solid</property>
            <property name="borderRightWidth">1pt</property>
            <property name="borderTopColor">#CCCCCC</property>
            <property name="borderTopStyle">solid</property>
            <property name="borderTopWidth">1pt</property>
        </style>
    </styles>
    <page-setup>
        <simple-master-page name="Simple MasterPage" id="2">
            <page-footer>
                <text id="3">
                    <property name="contentType">html</property>
                    <text-property 
name="content"><![CDATA[<value-of>new Date()</value-of>]]></text-property>
                </text>
            </page-footer>
        </simple-master-page>
    </page-setup>
    <body>
        <table id="12">
            <property name="width">100%</property>
            <property name="dataSet">Data Set1</property>
            <list-property name="boundDataColumns">
                <structure>
                    <property name="name">id</property>
                    <property name="displayName">id</property>
                    <expression 
name="expression">dataSetRow["id"]</expression>
                    <property name="dataType">string</property>
                </structure>
                <structure>
                    <property name="name">companyid</property>
                    <property name="displayName">companyid</property>
                    <expression 
name="expression">dataSetRow["companyid"]</expression>
                    <property name="dataType">string</property>
                </structure>
            </list-property>
            <column id="26"/>
            <column id="27"/>
            <header>
                <row id="13">
                    <cell id="14">
                        <label id="15">
                            <text-property name="text">id</text-property>
                        </label>
                    </cell>
                    <cell id="16">
                        <label id="17">
                            <text-property 
name="text">companyid</text-property>
                        </label>
                    </cell>
                </row>
            </header>
            <detail>
                <row id="18">
                    <cell id="19">
                        <data id="20">
                            <property name="resultSetColumn">id</property>
                        </data>
                    </cell>
                    <cell id="21">
                        <data id="22">
                            <property 
name="resultSetColumn">companyid</property>
                        </data>
                    </cell>
                </row>
            </detail>
            <footer>
                <row id="23">
                    <cell id="24"/>
                    <cell id="25"/>
                </row>
            </footer>
        </table>
    </body>
</report>


Sebastian Pogorzelski wrote:
> Hello,
>
> I have the following example XML doc as a data source:
>
> <companies>
>     <company id="c1">
>         <employee id="e1"/>
>         <employee id="e2"/>
>     </company>
>     <company id="c2">
>         <employee id="e1"/>
>         <employee id="e2"/>
>         <employee id="e3"/>
>     </company>
> </companies>
>
> I have created a dynamic combo box report parameter called 'cid' of type 
> string, populated from a simple /companies/company/@id dataset.
> I am trying to create an 'employees' dataset with the following row 
> mapping:
>
> /companies/company[@id={?cid?}]/employee
>
> the result is empty.
>
> Other times i get unpredictable behavior, e.g. error:
> A BIRT exception occurred.
> Plug-in Provider:Eclipse.org
> Plug-in Name:BIRT Data Engine
> Plug-in ID:org.eclipse.birt.data
> Version:2.3.1.v20080829
> Error Code:odaconsumer.CannotPrepareStatement
> Error Message:Failed to prepare the following query for the data set 
> type org.eclipse.datatools.enablement.oda.xml.dataSet.
> The filter definition is invalid.
>
> Sometimes the error doesn't show up, but the row mapping field contents 
> dissappear.
>
>
> how do i insert a report parameter into an XPath expression in row 
> mapping when creating a dataset from XML file?
>
> Do i have to escape inverted commas?
>
> Thanks
> Sp