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我有一個碧玉報告2子報告。當我從一個Java程序執行報告時，它顯示出來但是有空的子報告。這裏是我的報告：賈斯珀報告子報表不顯示數據
<?xml version="1.0" encoding="UTF-8"?>
<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="report3" pageWidth="595" pageHeight="842" columnWidth="535" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="b0b596c0-43c5-4c85-8e81-e92b916f7bb5">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<style name="Title" fontName="Arial" fontSize="26" isBold="true" pdfFontName="Helvetica-Bold"/>
<style name="SubTitle" forecolor="#666666" fontName="Arial" fontSize="18"/>
<style name="Column header" forecolor="#666666" fontName="Arial" fontSize="12" isBold="true"/>
<style name="Detail" fontName="Arial" fontSize="12"/>
<parameter name="customer_id" class="java.lang.Integer">
<defaultValueExpression><![CDATA[]]></defaultValueExpression>
</parameter>
<parameter name="SUBREPORT_DIR" class="java.lang.String" isForPrompting="false">
<defaultValueExpression><![CDATA["reports/"]]></defaultValueExpression>
</parameter>
<parameter name="order_date" class="java.util.Date">
<defaultValueExpression><![CDATA[]]></defaultValueExpression>
</parameter>
<parameter name="title" class="java.lang.String"/>
<queryString>
<![CDATA[SELECT
customer.`name` AS customer_name
FROM
`customer` customer
where id=$P{customer_id}]]>
</queryString>
<field name="customer_name" class="java.lang.String"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="95" splitType="Stretch">
<staticText>
<reportElement style="SubTitle" x="102" y="65" width="54" height="20" uuid="57dccf10-55f0-4d62-b391-c0a835ea062b"/>
<textElement textAlignment="Right">
<font fontName="Serif" size="14"/>
</textElement>
<text><![CDATA[التاريخ:]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="478" y="65" width="77" height="20" uuid="cc412a3e-0e4f-4868-9ea3-75c9e2f08bd3"/>
<textElement textAlignment="Right">
<font fontName="Serif" size="14" isBold="true"/>
</textElement>
<text><![CDATA[المطلوب من:]]></text>
</staticText>
<textField>
<reportElement style="Detail" x="229" y="65" width="249" height="20" uuid="28bb50ef-8818-45d6-97c5-6608cc747060"/>
<textElement textAlignment="Right">
<font fontName="Serif" size="14"/>
</textElement>
<textFieldExpression><![CDATA[$F{customer_name}]]></textFieldExpression>
</textField>
<textField isBlankWhenNull="true">
<reportElement x="3" y="65" width="100" height="20" uuid="32a97ac4-8aab-4167-99d6-1c3489f83db2"/>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font fontName="Serif" size="14"/>
</textElement>
<textFieldExpression><![CDATA[$P{order_date}]]></textFieldExpression>
</textField>
<textField>
<reportElement style="Title" x="142" y="16" width="265" height="33" uuid="dc9fed5e-e03c-475c-bd2b-1b351c318192"/>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font fontName="Serif" size="26" isBold="true"/>
</textElement>
<textFieldExpression><![CDATA[$P{title}]]></textFieldExpression>
</textField>
</band>
</title>
<pageHeader>
<band splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band splitType="Stretch"/>
</columnHeader>
<detail>
<band height="195" splitType="Stretch">
<subreport>
<reportElement x="2" y="1" width="553" height="109" isRemoveLineWhenBlank="true" isPrintInFirstWholeBand="true" uuid="e9c0b556-6457-4dc8-9064-b9bf8a280490"/>
<subreportParameter name="title">
<subreportParameterExpression><![CDATA[$P{title}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="REPORT_CONNECTION">
<subreportParameterExpression><![CDATA[$P{REPORT_CONNECTION}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="order_date">
<subreportParameterExpression><![CDATA[$P{order_date}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="cust_id">
<subreportParameterExpression><![CDATA[$P{customer_id}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="customer_id">
<subreportParameterExpression><![CDATA[$P{customer_id}]]></subreportParameterExpression>
</subreportParameter>
<connectionExpression><![CDATA[java.sql.DriverManager.getConnection("jdbc:mysql://localhost:3306/metal?useUnicode=yes&characterEncoding=UTF-8","root", "")]]></connectionExpression>
<subreportExpression><![CDATA[$P{SUBREPORT_DIR} + "orders.jasper"]]></subreportExpression>
</subreport>
<subreport>
<reportElement positionType="Float" x="2" y="109" width="554" height="86" isRemoveLineWhenBlank="true" isPrintInFirstWholeBand="true" uuid="bca2d802-6eee-43c3-adb9-443cb2b11cd9"/>
<subreportParameter name="SUBREPORT_DIR">
<subreportParameterExpression><![CDATA[$P{SUBREPORT_DIR}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="title">
<subreportParameterExpression><![CDATA[$P{title}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="order_date">
<subreportParameterExpression><![CDATA[$P{order_date}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="cust_id">
<subreportParameterExpression><![CDATA[$P{customer_id}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="customer_id">
<subreportParameterExpression><![CDATA[$P{customer_id}]]></subreportParameterExpression>
</subreportParameter>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<subreportExpression><![CDATA[$P{SUBREPORT_DIR} + "order_additions.jasper"]]></subreportExpression>
</subreport>
</band>
</detail>
<columnFooter>
<band splitType="Stretch"/>
</columnFooter>
<pageFooter>
<band height="30" splitType="Stretch">
<textField>
<reportElement style="Column header" x="435" y="9" width="80" height="20" uuid="aba41e81-e785-4bdf-bbaa-1d8c3be8b391"/>
<textElement textAlignment="Right">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA["Page "+$V{PAGE_NUMBER}+" of"]]></textFieldExpression>
</textField>
<textField evaluationTime="Report">
<reportElement style="Column header" x="515" y="9" width="40" height="20" uuid="ef8ba53a-7da2-4fb1-a438-d1b0e2eb3a25"/>
<textElement>
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[" " + $V{PAGE_NUMBER}]]></textFieldExpression>
</textField>
<textField pattern="EEEEE dd MMMMM yyyy">
<reportElement style="Column header" x="2" y="9" width="197" height="20" uuid="84337f90-d94a-4f7a-a376-18bf89cc1de9"/>
<textElement>
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[new java.util.Date()]]></textFieldExpression>
</textField>
</band>
</pageFooter>
<summary>
<band splitType="Stretch"/>
</summary>
</jasperReport>
我想我的報表不會得到父報表的連接。如何解決這個問題？