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JSON String Field into a table


innovate

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In Jaspersoft Studio, I am using JSONQL to read a JSON file and all is working. However, one of my fields is itself encoded as a JSON String differently from the other fields - see below field employee.state.N.Values. Therefore this field in Jasper is always returned as a string. No matter what I have tried I am unable to get Jasper to interpretemployee.state.N.Values as JSON. I have tried various options in the Dataset & Query as well as trying to use Java on the string itself.

The requirement is to display employee.state.N.Values as a table. Any help appreciated on how I could do this?

{ "employee": { "352": { "name"  : "Jimmy",                        "email" : "Jimmy@co",                        "mobile": "0700 1234569",                        "state" : { "N": { "Values": "{"A": {"GP": "1700.00", "Er": "137.72", "Ee": "119.76", "GP-YTD": "6800.00"}}"                                         }                                  }                      }             }}[/code]
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You need to convert the String value to a JsonQLDataSource like so:

<?xml version="1.0" encoding="UTF-8"?><!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0  --><jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Report" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="4c53fb8c-7bb8-4faa-a219-05712dd54a30">    <style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">        <box>            <pen lineWidth="0.5" lineColor="#000000"/>            <topPen lineWidth="0.5" lineColor="#000000"/>            <leftPen lineWidth="0.5" lineColor="#000000"/>            <bottomPen lineWidth="0.5" lineColor="#000000"/>            <rightPen lineWidth="0.5" lineColor="#000000"/>        </box>    </style>    <style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">        <box>            <pen lineWidth="0.5" lineColor="#000000"/>            <topPen lineWidth="0.5" lineColor="#000000"/>            <leftPen lineWidth="0.5" lineColor="#000000"/>            <bottomPen lineWidth="0.5" lineColor="#000000"/>            <rightPen lineWidth="0.5" lineColor="#000000"/>        </box>    </style>    <style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">        <box>            <pen lineWidth="0.5" lineColor="#000000"/>            <topPen lineWidth="0.5" lineColor="#000000"/>            <leftPen lineWidth="0.5" lineColor="#000000"/>            <bottomPen lineWidth="0.5" lineColor="#000000"/>            <rightPen lineWidth="0.5" lineColor="#000000"/>        </box>    </style>    <subDataset name="TableDataset" uuid="70d9d3c4-af50-48fc-a8a9-205697b62f0c">        <field name="GP" class="java.lang.String">            <property name="net.sf.jasperreports.jsonql.field.expression" value="GP"/>        </field>        <field name="Er" class="java.lang.String">            <property name="net.sf.jasperreports.jsonql.field.expression" value="Er"/>        </field>        <field name="Ee" class="java.lang.String">            <property name="net.sf.jasperreports.jsonql.field.expression" value="Ee"/>        </field>        <field name="GP-YTD" class="java.lang.String">            <propertyExpression name="net.sf.jasperreports.jsonql.field.expression"><![CDATA["["GP-YTD"]"]]></propertyExpression>        </field>    </subDataset>    <queryString language="jsonql">        <![CDATA[employee..state.N]]>    </queryString>    <field name="Values" class="java.lang.String">        <property name="net.sf.jasperreports.jsonql.field.expression" value="Values"/>    </field>    <background>        <band splitType="Stretch"/>    </background>    <title>        <band height="79" splitType="Stretch">            <staticText>                <reportElement x="130" y="10" width="300" height="30" uuid="bd4b0bab-1996-4952-884b-5e508abc8af3"/>                <textElement textAlignment="Center" verticalAlignment="Middle">                    <font size="16"/>                </textElement>                <text><![CDATA[JSON String to JsonQLDataSource Example]]></text>            </staticText>        </band>    </title>    <pageHeader>        <band height="35" splitType="Stretch"/>    </pageHeader>    <columnHeader>        <band height="30" splitType="Stretch"/>    </columnHeader>    <detail>        <band height="64" splitType="Stretch">            <componentElement>                <reportElement x="0" y="0" width="200" height="64" uuid="d521af5c-22ab-4e28-a8ef-7bbeedd122ef">                    <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>                    <property name="com.jaspersoft.studio.table.style.table_header" value="Table_TH"/>                    <property name="com.jaspersoft.studio.table.style.column_header" value="Table_CH"/>                    <property name="com.jaspersoft.studio.table.style.detail" value="Table_TD"/>                </reportElement>                <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">                    <datasetRun subDataset="TableDataset" uuid="318415a6-a046-4886-b04a-f13c3e9bf6f0">                        <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JsonQLDataSource(new ByteArrayInputStream($F{Values}.getBytes("UTF-8")), "A")]]></dataSourceExpression>                    </datasetRun>                    <jr:column width="50" uuid="21fbea93-d2e3-4572-b730-2dfba3eab448">                        <jr:columnHeader style="Table_CH" height="30">                            <staticText>                                <reportElement x="0" y="0" width="50" height="30" uuid="b54c30af-fb8f-42cc-81d3-a7423ca9b329"/>                                <text><![CDATA[GP]]></text>                            </staticText>                        </jr:columnHeader>                        <jr:detailCell style="Table_TD" height="30">                            <textField>                                <reportElement x="0" y="0" width="50" height="30" uuid="6646c3f5-5074-4e24-85ae-9b0b39d04a30"/>                                <textFieldExpression><![CDATA[$F{GP}]]></textFieldExpression>                            </textField>                        </jr:detailCell>                    </jr:column>                    <jr:column width="50" uuid="996ba5ec-f669-42b5-9bdb-dae2605e4dee">                        <jr:columnHeader style="Table_CH" height="30">                            <staticText>                                <reportElement x="0" y="0" width="50" height="30" uuid="e2093fd3-158b-45e2-ac59-44c79b2a2ba2"/>                                <text><![CDATA[Er]]></text>                            </staticText>                        </jr:columnHeader>                        <jr:detailCell style="Table_TD" height="30">                            <textField>                                <reportElement x="0" y="0" width="50" height="30" uuid="133cdcd6-1b61-4d47-816c-1e68a9aa71a8"/>                                <textFieldExpression><![CDATA[$F{Er}]]></textFieldExpression>                            </textField>                        </jr:detailCell>                    </jr:column>                    <jr:column width="50" uuid="1e059e33-1821-49bc-b4a9-7f08edcbd979">                        <jr:columnHeader style="Table_CH" height="30">                            <staticText>                                <reportElement x="0" y="0" width="50" height="30" uuid="7338cd27-5d1b-4a79-a64a-eea0878565f1"/>                                <text><![CDATA[Ee]]></text>                            </staticText>                        </jr:columnHeader>                        <jr:detailCell style="Table_TD" height="30">                            <textField>                                <reportElement x="0" y="0" width="50" height="30" uuid="c9352309-2ded-4e3a-9e4d-f158e2af1b8e"/>                                <textFieldExpression><![CDATA[$F{Ee}]]></textFieldExpression>                            </textField>                        </jr:detailCell>                    </jr:column>                    <jr:column width="50" uuid="e63302fb-4fbb-4685-a0ca-3a6933aa5b3a">                        <jr:columnHeader style="Table_CH" height="30">                            <staticText>                                <reportElement x="0" y="0" width="50" height="30" uuid="fa704777-82d1-46bd-8dfe-b33b50ed36f6"/>                                <text><![CDATA[GP-YTD]]></text>                            </staticText>                        </jr:columnHeader>                        <jr:detailCell style="Table_TD" height="30">                            <textField>                                <reportElement x="0" y="0" width="50" height="30" uuid="8ffd553e-3e7b-4d45-a932-8bf5a99d7a28"/>                                <textFieldExpression><![CDATA[$F{GP-YTD}]]></textFieldExpression>                            </textField>                        </jr:detailCell>                    </jr:column>                </jr:table>            </componentElement>        </band>    </detail></jasperReport>[/code]

 

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Excellent- thankyou so much!
This was the part i was missing: 
new net.sf.jasperreports.engine.data.JsonQLDataSource(new ByteArrayInputStream($F{Values}.getBytes("UTF-8")), "A")

Now, my application is a slightly more complex in that the JSON string may have more than one KEY- see below.
Furthermore, I dont know the names of the keys (e.g. one is called "A" and the other "Z".).

I wish to create a table with the first column being the KEY, and the Values in each of the subsequent columns.

KEYGPErEeGP-YTD
A1700137.72119.766800.00
Z200.0011.7212.7613.00

I assume there are 2 parts to solve this: (1) identify the KEYs? and (2) return each KEY dict. 
I tried the modify/ remove the SelectionExpression in order to try and return return , but was unsuccessfull.

Any help appreciated on how the report below could be enhanced to achieve this. Many thanks in advance.

{ "employee": { "352": { "name"  : "Jimmy",                        "email" : "Jimmy@co",                        "mobile": "0700 1234569",                        "state" : { "N": { "Values": "{"A": {"GP": "1700.00", "Er": "137.72", "Ee": "119.76", "GP-YTD": "6800.00"},                  "Z": {"GP": "200.00", "Er": "11.72", "Ee": "12.76", "GP-YTD": "13.00"}}"                                         }                                  }                      }             }}[/code]
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Unfortunately there's no JSONQL operation to pick up an object key(s) right now. A future enhancement may address this. You could get everything else just by modifying the JsonQLDatasource query:

new net.sf.jasperreports.engine.data.JsonQLDataSource(new ByteArrayInputStream($F{Values}.getBytes("UTF-8")), ".*")

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Thankyou so much for the pointer to: 

new net.sf.jasperreports.engine.data.JsonQLDataSource(new ByteArrayInputStream($F{Values}.getBytes("UTF-8")), ".*")

That worked perfectly to retreive all the dicts.

Regarding the ability to pick up object keys, that is a shame, but appreciate the clarification.

I was in fact able to work around this by defining a couple of keys in the subdataset:

  • ^{2}.A.GP
  • ^{2}.Z.GP

and then using an expression like this to figure out which dict was in each row:

  • T(IF(EQUALS($F{A_key}, $F{GP}),"A","")) +
        T(IF(EQUALS($F{Z_key},$F{GP}),"Z",""))

Thanks a lot.

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