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| Re: Using variables in tables [message #502552 is a reply to message #502517] |
Tue, 08 December 2009 19:09  |
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Jett,
There are a lot of ways of doing this.
1 - you could use reportContext.setGlobalVariable
2 - Just use JavaScript variables without the keyword var
3 - Write your own aggregation extension
1 and 2 are pretty much the same and can be used to store a js array of
the previous values. For example in a table if I want a column that
references the previous rows value you could do this:
in OnPrepare for the table:
//setup js array
prev=[];
i=0;
Then in the oncreate for the row
prev[i] = this.getRowData().getColumnValue("QUANTITYORDERED");
i++;
Now to display it you are better off using a text element as opposed to
a data element bound to a column. The reason for this is that the
evaluation of all bound columns for a row occurs before the on create of
a row. So if you use a text element that uses a value-of statement it
will be evaluated at the time of its creation.
<VALUE-OF>if( row.__rownum > 0 ){
prev[row.__rownum-1];
}else{
0;
}</VALUE-OF>
Obviously you will want to change how the value gets calculated but this
mechanism should work for it.
Number 3 allows you to create your own aggregation element that could do
what you want. This give the advantage of write once and use many
times. For details on this approach see:
http://www.birt-exchange.org/devshare/designing-birt-reports /1103-aggregate-function-to-subtract-previous-row-value/#des cription
Attached is a sample that uses number 2.
Jason
<?xml version="1.0" encoding="UTF-8"?>
<report xmlns="http://www.eclipse.org/birt/2005/design" version="3.2.20"
id="1">
<property name="createdBy">Eclipse BIRT Designer Version
2.5.1.v20090903 Build <2.5.1.v20090917-1447></property>
<property name="units">in</property>
<property name="iconFile">/templates/blank_report.gif</property>
<property name="bidiLayoutOrientation">ltr</property>
<data-sources>
<oda-data-source
extensionID="org.eclipse.birt.report.data.oda.jdbc" name="Data Source"
id="7">
<text-property name="displayName"></text-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>
</structure>
<structure>
<property name="columnName">PRODUCTCODE</property>
<text-property
name="displayName">PRODUCTCODE</text-property>
</structure>
<structure>
<property name="columnName">QUANTITYORDERED</property>
<text-property
name="displayName">QUANTITYORDERED</text-property>
</structure>
<structure>
<property name="columnName">PRICEEACH</property>
<text-property
name="displayName">PRICEEACH</text-property>
</structure>
<structure>
<property name="columnName">ORDERLINENUMBER</property>
<text-property
name="displayName">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 = 10101]]></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: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" 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-cell" 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>
<label id="50">
<text-property name="text">Look at onPrepare for table and
onCreate fro the row</text-property>
</label>
<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">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">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">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">dataSetRow["ORDERLINENUMBER"]</expression >
<property name="dataType">integer</property>
</structure>
<structure>
<property name="name">Aggregation</property>
<property name="dataType">float</property>
<property name="aggregateFunction">SUM</property>
<list-property name="arguments">
<structure>
<property name="name">Expression</property>
<expression name="value"
type="javascript">row["QUANTITYORDERED"]</expression>
</structure>
</list-property>
</structure>
</list-property>
<method name="onPrepare"><![CDATA[prev=[];
i=0;]]></method>
<column id="38"/>
<column id="40"/>
<column id="46"/>
<column id="42"/>
<header>
<row id="10">
<cell id="11">
<label id="12">
<text-property
name="text">ORDERNUMBER</text-property>
</label>
</cell>
<cell id="15">
<label id="16">
<text-property
name="text">QUANTITYORDERED</text-property>
</label>
</cell>
<cell id="43">
<label id="49">
<text-property name="text">Previous
Row</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[prev[i] =
this.getRowData().getColumnValue("QUANTITYORDERED");
i++;
]]></method>
<cell id="22">
<data id="23">
<property
name="resultSetColumn">ORDERNUMBER</property>
</data>
</cell>
<cell id="26">
<data id="27">
<property
name="resultSetColumn">QUANTITYORDERED</property>
</data>
</cell>
<cell id="44">
<text id="48">
<property name="contentType">html</property>
<text-property
name="content"><![CDATA[<VALUE-OF>if( row.__rownum > 0 ){
prev[row.__rownum-1];
}else{
0;
}</VALUE-OF>]]></text-property>
</text>
</cell>
<cell id="30">
<data id="31">
<property
name="resultSetColumn">ORDERLINENUMBER</property>
</data>
</cell>
</row>
</detail>
<footer>
<row id="32">
<cell id="33"/>
<cell id="35">
<data id="56">
<property
name="resultSetColumn">Aggregation</property>
</data>
</cell>
<cell id="45"/>
<cell id="37"/>
</row>
</footer>
</table>
</body>
</report>
Jett Hanna wrote:
> I am writing a report where I need to use a balance computed in a
> previous row of a grouped table.
>
> On the first row, I have an initial balance supplied by the database. I
> then calculate interest to the time period since the previous payment
> (usually zero days on the first one, but not always), and then calculate
> the new balance by subtracting the payment made.
>
> On the next and succeeding rows, I need to calculate the interest based
> on the balance from the preceeding rows.
>
> Can I set a variable with the previous balance on the next row of the
> table detail? If so, how do I get it into the data field? Should the
> variable be created in the onCreate script, or onPrepare? Of which
> object=the group in the table, or the individual data field? What code
> will get the info from the prior balance?
>
> Thanks- Jett Hanna
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