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Accessing data in previous row [message #639258]

Mon, 15 November 2010 13:47

Don Wood
Messages: 32
Registered: February 2010
Location: Pennsylvania

Member

Is there a way in script that I can access data in previous rows? In other tools that I've used, I could do some thing like item_nbr[-1] to determine the item_nbr in the previous row. But I don't see how to do this in BIRT.

Also, if this is possible, what event would it be on?

I am using BIRT 2.3.2. Also, I'm a new user so I apologize if this has already been answered in previous posts. I've searched and found nothing definitive.

Thanks much.
-Don

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Re: Accessing data in previous row [message #639479 is a reply to message #639258]

Tue, 16 November 2010 12:21

Jason Weathersby
Messages: 9167
Registered: July 2009

Senior Member

Don

There are a couple of ways you can do this. One way would be to develop
your own aggregate extension as described in this example:
http://www.birt-exchange.org/org/devshare/designing-birt-rep orts/1103-aggregate-function-to-subtract-previous-row-value/
This approach is best used if you want to reuse the same method later
or to share with others. The other way to do this is with script. Just
store the value when the data element is created by using an oncreate
script and calling this.getValue. Take a look at this thread:
http://dev.eclipse.org/newslists/news.eclipse.birt/msg22011. html

If you want to store all values just create a js array in the onPrepare
of the table.
myjsarray = [] ;

Then in the onCreate of the row use this script:
var col1 = this.getRowData().getColumnValue(0);
var col2 = this.getRowData().getColumnValue(1);
var col3 = this.getRowData().getColumnValue(2);
var col4 = this.getRowData().getColumnValue(3);
var col5 = this.getRowData().getColumnValue(4);
myjsarray.push(new Array(col1, col2, col3, col4, col5));

This makes a double array that I can reference after the table like:
myjsarray[1][4];

If you use the js approaches make sure to use a text element instead of
a data element to present the value. This is because data elements
using bindings that can be calculated before your scripts run. The text
element circumvents this process when using a value-of tag. For example

//type set to html - not Auto
<VALUE-OF>myjsarray[3][1]</VALUE-OF>

See attached example of this last approach.

Jason

<?xml version="1.0" encoding="UTF-8"?>
<report xmlns="http://www.eclipse.org/birt/2005/design" version="3.2.22"
id="1">
<property name="createdBy">Eclipse BIRT Designer Version
2.6.1.v20100902 Build <2.6.1.v20100915-1750></property>
<property name="units">in</property>
<property name="iconFile">/templates/blank_report.gif</property>
<property name="bidiLayoutOrientation">ltr</property>
<property name="imageDPI">96</property>
<data-sources>
<oda-data-source
extensionID="org.eclipse.birt.report.data.oda.jdbc" name="Data Source"
id="7">
<list-property name="privateDriverProperties">
<ex-property>
<name>contentBidiFormatStr</name>
<value>ILYNN</value>
</ex-property>
<ex-property>
<name>metadataBidiFormatStr</name>
<value>ILYNN</value>
</ex-property>
</list-property>
<property
name="odaDriverClass">org.eclipse.birt.report.data.oda.sampledb.Driver </property>
<property name="odaURL">jdbc:classicmodels:sampledb</property>
<property name="odaUser">ClassicModels</property>
</oda-data-source>
</data-sources>
<data-sets>
<oda-data-set
extensionID="org.eclipse.birt.report.data.oda.jdbc.JdbcSelectDataSet "
name="Data Set" id="8">
<list-property name="columnHints">
<structure>
<property name="columnName">ORDERNUMBER</property>
<text-property
name="displayName">ORDERNUMBER</text-property>
<text-property
name="heading">ORDERNUMBER</text-property>
</structure>
<structure>
<property name="columnName">PRODUCTCODE</property>
<text-property
name="displayName">PRODUCTCODE</text-property>
<text-property
name="heading">PRODUCTCODE</text-property>
</structure>
<structure>
<property name="columnName">QUANTITYORDERED</property>
<text-property
name="displayName">QUANTITYORDERED</text-property>
<text-property
name="heading">QUANTITYORDERED</text-property>
</structure>
<structure>
<property name="columnName">PRICEEACH</property>
<text-property
name="displayName">PRICEEACH</text-property>
<text-property name="heading">PRICEEACH</text-property>
</structure>
<structure>
<property name="columnName">ORDERLINENUMBER</property>
<text-property
name="displayName">ORDERLINENUMBER</text-property>
<text-property
name="heading">ORDERLINENUMBER</text-property>
</structure>
</list-property>
<structure name="cachedMetaData">
<list-property name="resultSet">
<structure>
<property name="position">1</property>
<property name="name">ORDERNUMBER</property>
<property name="dataType">integer</property>
</structure>
<structure>
<property name="position">2</property>
<property name="name">PRODUCTCODE</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">3</property>
<property name="name">QUANTITYORDERED</property>
<property name="dataType">integer</property>
</structure>
<structure>
<property name="position">4</property>
<property name="name">PRICEEACH</property>
<property name="dataType">float</property>
</structure>
<structure>
<property name="position">5</property>
<property name="name">ORDERLINENUMBER</property>
<property name="dataType">integer</property>
</structure>
</list-property>
</structure>
<property name="dataSource">Data Source</property>
<list-property name="resultSet">
<structure>
<property name="position">1</property>
<property name="name">ORDERNUMBER</property>
<property name="nativeName">ORDERNUMBER</property>
<property name="dataType">integer</property>
<property name="nativeDataType">4</property>
</structure>
<structure>
<property name="position">2</property>
<property name="name">PRODUCTCODE</property>
<property name="nativeName">PRODUCTCODE</property>
<property name="dataType">string</property>
<property name="nativeDataType">12</property>
</structure>
<structure>
<property name="position">3</property>
<property name="name">QUANTITYORDERED</property>
<property name="nativeName">QUANTITYORDERED</property>
<property name="dataType">integer</property>
<property name="nativeDataType">4</property>
</structure>
<structure>
<property name="position">4</property>
<property name="name">PRICEEACH</property>
<property name="nativeName">PRICEEACH</property>
<property name="dataType">float</property>
<property name="nativeDataType">8</property>
</structure>
<structure>
<property name="position">5</property>
<property name="name">ORDERLINENUMBER</property>
<property name="nativeName">ORDERLINENUMBER</property>
<property name="dataType">integer</property>
<property name="nativeDataType">5</property>
</structure>
</list-property>
<xml-property name="queryText"><![CDATA[select *
from orderdetails
where ordernumber < 10103]]></xml-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>ORDERNUMBER</design:name>
<design:position>1</design:position>
<design:nativeDataTypeCode>4</design:nativeDataTypeCode>
<design:precision>10</design:precision>
<design:scale>0</design:scale>
<design:nullability>Nullable</design:nullability>
<design:uiHints>
<design:displayName>ORDERNUMBER</design:displayName>
</design:uiHints>
</design:attributes>
<design:usageHints>
<design:label>ORDERNUMBER</design:label>
<design:formattingHints>
<design:displaySize>11</design:displaySize>
</design:formattingHints>
</design:usageHints>
</design:resultColumnDefinitions>
<design:resultColumnDefinitions>
<design:attributes>
<design:name>PRODUCTCODE</design:name>
<design:position>2</design:position>
<design:nativeDataTypeCode>12</design:nativeDataTypeCode>
<design:precision>15</design:precision>
<design:scale>0</design:scale>
<design:nullability>Nullable</design:nullability>
<design:uiHints>
<design:displayName>PRODUCTCODE</design:displayName>
</design:uiHints>
</design:attributes>
<design:usageHints>
<design:label>PRODUCTCODE</design:label>
<design:formattingHints>
<design:displaySize>15</design:displaySize>
</design:formattingHints>
</design:usageHints>
</design:resultColumnDefinitions>
<design:resultColumnDefinitions>
<design:attributes>
<design:name>QUANTITYORDERED</design:name>
<design:position>3</design:position>
<design:nativeDataTypeCode>4</design:nativeDataTypeCode>
<design:precision>10</design:precision>
<design:scale>0</design:scale>
<design:nullability>Nullable</design:nullability>
<design:uiHints>
<design:displayName>QUANTITYORDERED</design:displayName>
</design:uiHints>
</design:attributes>
<design:usageHints>
<design:label>QUANTITYORDERED</design:label>
<design:formattingHints>
<design:displaySize>11</design:displaySize>
</design:formattingHints>
</design:usageHints>
</design:resultColumnDefinitions>
<design:resultColumnDefinitions>
<design:attributes>
<design:name>PRICEEACH</design:name>
<design:position>4</design:position>
<design:nativeDataTypeCode>8</design:nativeDataTypeCode>
<design:precision>15</design:precision>
<design:scale>0</design:scale>
<design:nullability>Nullable</design:nullability>
<design:uiHints>
<design:displayName>PRICEEACH</design:displayName>
</design:uiHints>
</design:attributes>
<design:usageHints>
<design:label>PRICEEACH</design:label>
<design:formattingHints>
<design:displaySize>22</design:displaySize>
</design:formattingHints>
</design:usageHints>
</design:resultColumnDefinitions>
<design:resultColumnDefinitions>
<design:attributes>
<design:name>ORDERLINENUMBER</design:name>
<design:position>5</design:position>
<design:nativeDataTypeCode>5</design:nativeDataTypeCode>
<design:precision>5</design:precision>
<design:scale>0</design:scale>
<design:nullability>Nullable</design:nullability>
<design:uiHints>
<design:displayName>ORDERLINENUMBER</design:displayName>
</design:uiHints>
</design:attributes>
<design:usageHints>
<design:label>ORDERLINENUMBER</design:label>
<design:formattingHints>
<design:displaySize>6</design:displaySize>
</design:formattingHints>
</design:usageHints>
</design:resultColumnDefinitions>
</design:resultSetColumns>
<design:criteria/>
</design:resultSetDefinitions>
</design:ResultSets>
</model:DesignValues>
]]></xml-property>
</oda-data-set>
</data-sets>
<styles>
<style name="report" id="4">
<property name="fontFamily">sans-serif</property>
<property name="fontSize">10pt</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>
<style name="crosstab" id="6">
<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="9">
<property name="dataSet">Data Set</property>
<list-property name="boundDataColumns">
<structure>
<property name="name">ORDERNUMBER</property>
<text-property
name="displayName">ORDERNUMBER</text-property>
<expression name="expression"
type="javascript">dataSetRow["ORDERNUMBER"]</expression >
<property name="dataType">integer</property>
</structure>
<structure>
<property name="name">PRODUCTCODE</property>
<text-property
name="displayName">PRODUCTCODE</text-property>
<expression name="expression"
type="javascript">dataSetRow["PRODUCTCODE"]</expression >
<property name="dataType">string</property>
</structure>
<structure>
<property name="name">QUANTITYORDERED</property>
<text-property
name="displayName">QUANTITYORDERED</text-property>
<expression name="expression"
type="javascript">dataSetRow["QUANTITYORDERED"]</expression >
<property name="dataType">integer</property>
</structure>
<structure>
<property name="name">PRICEEACH</property>
<text-property
name="displayName">PRICEEACH</text-property>
<expression name="expression"
type="javascript">dataSetRow["PRICEEACH"]</expression>
<property name="dataType">float</property>
</structure>
<structure>
<property name="name">ORDERLINENUMBER</property>
<text-property
name="displayName">ORDERLINENUMBER</text-property>
<expression name="expression"
type="javascript">dataSetRow["ORDERLINENUMBER"]</expression >
<property name="dataType">integer</property>
</structure>
</list-property>
<method name="onPrepare"><![CDATA[myjsarray = [] ; ]]></method>
<column id="38"/>
<column id="39"/>
<column id="40"/>
<column id="41"/>
<column id="42"/>
<header>
<row id="10">
<cell id="11">
<label id="12">
<text-property
name="text">ORDERNUMBER</text-property>
</label>
</cell>
<cell id="13">
<label id="14">
<text-property
name="text">PRODUCTCODE</text-property>
</label>
</cell>
<cell id="15">
<label id="16">
<text-property
name="text">QUANTITYORDERED</text-property>
</label>
</cell>
<cell id="17">
<label id="18">
<text-property
name="text">PRICEEACH</text-property>
</label>
</cell>
<cell id="19">
<label id="20">
<text-property
name="text">ORDERLINENUMBER</text-property>
</label>
</cell>
</row>
</header>
<detail>
<row id="21">
<method name="onCreate"><![CDATA[var col1 =
this.getRowData().getColumnValue(0);
var col2 = this.getRowData().getColumnValue(1);
var col3 = this.getRowData().getColumnValue(2);
var col4 = this.getRowData().getColumnValue(3);
var col5 = this.getRowData().getColumnValue(4);
myjsarray.push(new Array(col1, col2, col3, col4, col5));]]></method>
<cell id="22">
<data id="23">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">ORDERNUMBER</property>
</data>
</cell>
<cell id="24">
<data id="25">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">PRODUCTCODE</property>
</data>
</cell>
<cell id="26">
<data id="27">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">QUANTITYORDERED</property>
</data>
</cell>
<cell id="28">
<data id="29">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">PRICEEACH</property>
</data>
</cell>
<cell id="30">
<data id="31">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">ORDERLINENUMBER</property>
</data>
</cell>
</row>
</detail>
<footer>
<row id="32">
<cell id="33"/>
<cell id="34">
<text id="45">
<property name="contentType">html</property>
<text-property
name="content"><![CDATA[<VALUE-OF>myjsarray[3][1]</VALUE-OF >]]></text-property>
</text>
</cell>
<cell id="35"/>
<cell id="36"/>
<cell id="37"/>
</row>
</footer>
</table>
</body>
</report>

On 11/15/2010 1:47 PM, Don wrote:
> Is there a way in script that I can access data in previous rows? In
> other tools that I've used, I could do some thing like item_nbr[-1] to
> determine the item_nbr in the previous row. But I don't see how to do
> this in BIRT.
>
> Also, if this is possible, what event would it be on?
> I am using BIRT 2.3.2. Also, I'm a new user so I apologize if this has
> already been answered in previous posts. I've searched and found nothing
> definitive.
>
> Thanks much.
> -Don
>

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