Question

我的jasper报告中有一个查询，用户给定输入生成的结果集之一可能是下面列出的数据：

memberId stockNo refineryCode constantSerialNo  serialNo
45       1       IAR          A-                98729
45       1       IAR          A-                98730
45       1       IAR          A-                98731
45       1       IAR          A-                98733
45       1       IAR          A-                98734
45       1       IAR          A-                98736
45       1       IAR          A-                98737
45       1       IAR          A-                98738
45       1       IAR          A-                98739

如果serialNo是连续的，我想在一行显示这些数据。因此，如果我想在报告中显示上述数据，我必须以下面所述的方式显示它们：

memberId stockNo refineryCode constantSerialNo  serialNo
45       1       IAR          A-                98729 - 98731
45       1       IAR          A-                98733 - 98734
45       1       IAR          A-                98736 - 98739

我知道可能有一些解决方案在sql上使用游标或在像OOP这样的OOP语言中使用ORM并发送到jasper报告。然而，出于好奇，我想问一下是否可能有使用iReport的表达式或组的动态解决方案，或者现在没有出现在我脑海中的任何其他可以让我的生活更轻松的事情。

Answer 1

这是一种方法，假设serialNo是某种数值而不是字符串。

sql查询结果的数据集必须由serialNo排序，如上所示。
使用以下组表达式创建Report Group：$V{GroupCount} == new BigDecimal(0) ? $F{serialNo}:$F{serialNo}.subtract($V{GroupCount})。每当serialNo序列中存在间隙时，这将创建一个新组。
创建一个变量GroupCount，用于计算当前组中连续serialNo个值的数量。此变量用于跟踪下一个预期的serialNo值。
创建一个变量StartRange，它将保存给定范围的连续serialNo值的起始值。该值应在新组的开头重置，并具有以下值：$V{GroupCount}.intValue() == 1 ? $F{ID}:$V{StartRange}。
将Evaluation Time字段的serialNo值设置为ReportGroup。将以下值放入其中：$V{StartRange}+" - " + $F{serialNo}。
将Print When Expression频段的Detail更改为以下内容：new Boolean($V{GroupCount}.intValue() == 1)。

我在下面发布了完整的jrxml代码。

<?xml version="1.0" encoding="utf-8"?>
<!-- Created with iReport - A designer for JasperReports -->
<!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN"
"http://jasperreports.sourceforge.net/dtds/jasperreport.dtd">
<jasperReport name="Group_By_Consecutive" columnCount="1" printOrder="Vertical" orientation="Portrait" pageWidth="595" pageHeight="842" columnWidth="535" columnSpacing="0" leftMargin="30" rightMargin="30" topMargin="20" bottomMargin="20" whenNoDataType="NoPages" isTitleNewPage="false" isSummaryNewPage="false">
  <property name="ireport.scriptlethandling" value="0" />
  <property name="ireport.encoding" value="UTF-8" />
  <import value="java.util.*" />
  <import value="net.sf.jasperreports.engine.*" />
  <import value="net.sf.jasperreports.engine.data.*" />
  <queryString>
    <![CDATA[select 1 as id, 'Name 1' as name from dual union all
select 2 as id, 'Name 2' as name from dual union all
select 3 as id, 'Name 3' as name from dual union all
select 4 as id, 'Name 4' as name from dual union all
select 6 as id, 'Name 6' as name from dual union all
select 7 as id, 'Name 7' as name from dual union all
select 8 as id, 'Name 8' as name from dual union all
select 9 as id, 'Name 9' as name from dual union all
select 10 as id, 'Name 10' as name from dual union all
select 11 as id, 'Name 11' as name from dual union all
select 14 as id, 'Name 14' as name from dual union all
select 15 as id, 'Name 15' as name from dual union all
select 16 as id, 'Name 16' as name from dual union all
select 17 as id, 'Name 17' as name from dual union all
select 23 as id, 'Name 23' as name from dual union all
select 24 as id, 'Name 24' as name from dual union all
select 25 as id, 'Name 25' as name from dual union all
select 26 as id, 'Name 26' as name from dual union all
select 27 as id, 'Name 27' as name from dual union all
select 28 as id, 'Name 28' as name from dual]]>
</queryString>
  <field name="ID" class="java.math.BigDecimal" />
  <field name="NAME" class="java.lang.String" />
  <variable name="GroupCount" class="java.math.BigDecimal" resetType="Group" resetGroup="Consecutive" calculation="Count">
    <variableExpression>
      <![CDATA[$F{ID}]]>
</variableExpression>
    <initialValueExpression>
      <![CDATA[new BigDecimal(0)]]>
</initialValueExpression>
  </variable>
  <variable name="StartRange" class="java.math.BigDecimal" resetType="Report" calculation="Nothing">
    <variableExpression>
      <![CDATA[$V{GroupCount}.intValue() == 1 ? $F{ID}:$V{StartRange}]]>
</variableExpression>
  </variable>
  <group name="Consecutive">
    <groupExpression>
      <![CDATA[$V{GroupCount} == new BigDecimal(0) ? $F{ID}:$F{ID}.subtract($V{GroupCount})]]>
</groupExpression>
    <groupHeader>
      <band height="0" isSplitAllowed="true"></band>
    </groupHeader>
    <groupFooter>
      <band height="0" isSplitAllowed="true"></band>
    </groupFooter>
  </group>
  <background>
    <band height="0" isSplitAllowed="true"></band>
  </background>
  <title>
    <band height="0" isSplitAllowed="true"></band>
  </title>
  <pageHeader>
    <band height="0" isSplitAllowed="true"></band>
  </pageHeader>
  <columnHeader>
    <band height="18" isSplitAllowed="true">
      <staticText>
        <reportElement x="0" y="0" width="200" height="18" key="staticText-1" />
        <box></box>
        <textElement>
          <font />
        </textElement>
        <text>
          <![CDATA[serialNo]]>
</text>
      </staticText>
      <staticText>
        <reportElement x="200" y="0" width="100" height="18" key="staticText-3" />
        <box></box>
        <textElement>
          <font />
        </textElement>
        <text>
          <![CDATA[Name]]>
</text>
      </staticText>
      <staticText>
        <reportElement x="300" y="0" width="100" height="18" key="staticText-4" />
        <box></box>
        <textElement>
          <font />
        </textElement>
        <text>
          <![CDATA[MetaData(Ignore)]]>
</text>
      </staticText>
    </band>
  </columnHeader>
  <detail>
    <band height="18" isSplitAllowed="true">
      <printWhenExpression>
        <![CDATA[new Boolean($V{GroupCount}.intValue() == 1)]]>
</printWhenExpression>
      <textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self">
        <reportElement x="200" y="0" width="100" height="18" key="textField" />
        <box></box>
        <textElement>
          <font />
        </textElement>
        <textFieldExpression class="java.lang.String">
          <![CDATA[$F{NAME}]]>
</textFieldExpression>
      </textField>
      <textField isStretchWithOverflow="false" pattern="##0.00" isBlankWhenNull="false" evaluationTime="Group" evaluationGroup="Consecutive" hyperlinkType="None" hyperlinkTarget="Self">
        <reportElement x="0" y="0" width="200" height="18" key="textField" />
        <box></box>
        <textElement>
          <font />
        </textElement>
        <textFieldExpression class="java.lang.String">
          <![CDATA[$V{StartRange}+" - " + $F{ID}]]>
</textFieldExpression>
      </textField>
      <textField isStretchWithOverflow="false" pattern="##0.00" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self">
        <reportElement x="300" y="0" width="100" height="18" key="textField" />
        <box></box>
        <textElement>
          <font />
        </textElement>
        <textFieldExpression class="java.math.BigDecimal">
          <![CDATA[$V{GroupCount}]]>
</textFieldExpression>
      </textField>
    </band>
  </detail>
  <columnFooter>
    <band height="0" isSplitAllowed="true"></band>
  </columnFooter>
  <pageFooter>
    <band height="0" isSplitAllowed="true"></band>
  </pageFooter>
  <summary>
    <band height="0" isSplitAllowed="true"></band>
  </summary>
</jasperReport>

在JasperReports（iReport）中对数据集上的连续数字进行分组

1 个答案: