将子字符串转换为数字 SSIS

Question

我有一个固定宽度的文本文件，我通过 SSIS 引入。作为 SQL Server 输入的一部分，我正在抓取一串字符并尝试将它们转换为派生列中的数字。
数据如下所示：

02 PR000000000000017943 0287801709

我需要获取 17943 并将其转换为 179.43

我尝试过的表达方式是：

(DT_NUMERIC,18,2)(SUBSTRING(EntireRow,10,18)
(DT_NUMERIC,18,2)TRIM(SUBSTRING(EntireRow,10,18))            

我不断收到以下错误：

组件“派生列”(2) 上的 ProcessInput 方法在处理输入“派生列输入”时失败，错误代码为 0xC0209029。

我已经看过了，但无法找到解决方案。

Answer 1

将字符串转换000000000000017943为十进制(18,2) 将导致值17943源没有小数位，那么为什么转换会知道您需要小数点呢？

此外，鉴于您的源数据，您的子字符串公式已关闭。这导致了一个源字符串R00000000000001794

也就是说，我采取了两种方法之一。我要么使用字符串操作插入小数位，要么使用数学除以 100。如果我已经在处理字符串，我通常会坚持使用这种方法，因为我讨厌不断地转换值。

去吃午饭，但这是我用来生成包的 Biml。抢bidshelper并用它来生成相同的SSIS包的我。

<Biml xmlns="http://schemas.varigence.com/biml.xsd">
    <FileFormats>
        <FlatFileFormat Name="FFF" IsUnicode="false" FlatFileType="Delimited">
            <Columns>
                <Column Name="EntireRow" DataType="AnsiString" Delimiter="CRLF" Length="58" />
            </Columns>
        </FlatFileFormat>
    </FileFormats>
    <Connections>
        <FlatFileConnection FilePath="C:\ssisdata\dba_89464.txt" FileFormat="FFF" Name="CM_FF" />
    </Connections>
    <Packages>
        <Package ConstraintMode="Linear" Name="dba_89464">
            <Tasks>
                <Dataflow Name="DFT Source">
                    <Transformations>
                        <FlatFileSource ConnectionName="CM_FF" Name="FF Source" />
                        <DerivedColumns Name="DER Split to row type">
                            <Columns>
                                <Column DataType="AnsiString" Name="Header" Length="2">SUBSTRING([EntireRow],1,2)</Column>
                            </Columns>
                        </DerivedColumns>
                        <ConditionalSplit Name="CSPL - Split on Header">
                            <OutputPaths>
                                <OutputPath Name="Type 2">
                                    <Expression>[Header] == "02"</Expression>
                                </OutputPath>
                            </OutputPaths>
                        </ConditionalSplit>
                        <Multicast Name="MC Demo approaches">
                            <InputPath OutputPathName="CSPL - Split on Header.Type 2" />
                            <OutputPaths>
                                <OutputPath Name="String Approach" />
                                <OutputPath Name="Math Approach" />
                            </OutputPaths>
                        </Multicast>
                        <!--
                        Generate our value as string and one without the decimal place but of a numeric type
                        -->
                        <DerivedColumns Name="DER Type 2 processing">
                            <InputPath OutputPathName="MC Demo approaches.String Approach" />
                            <Columns>
                                <Column DataType="AnsiString" Name="strTemporaryMyValue" Length="18">TRIM(SUBSTRING(EntireRow,11,18))</Column>
                            </Columns>
                        </DerivedColumns>
                        <!--
                            Add our decimal place, string operations
                            This is not concerned with empty strings, etc
                        -->
                        <DerivedColumns Name="DER Add decimal place">
                            <Columns>
                                <Column DataType="AnsiString" Name="withDecimalPlace"  Length="19">SUBSTRING([strTemporaryMyValue], 1, LEN([strTemporaryMyValue]) -2) + "." + RIGHT([strTemporaryMyValue], 2)</Column>
                            </Columns>
                        </DerivedColumns>

                        <DerivedColumns Name="DER Make string to decimal">
                            <Columns>
                                <Column DataType="Decimal" Name="MyValueViaString" Precision="18" Scale="2">(DT_NUMERIC, 18, 2)[withDecimalPlace]</Column>
                            </Columns>
                        </DerivedColumns>

                        <DerivedColumns Name="DER Dataviewer connector String" />


                        <DerivedColumns Name="DER slice string into numeric type">
                            <InputPath OutputPathName="MC Demo approaches.Math Approach" />
                            <Columns>
                                <Column DataType="Decimal" Name="decTemporaryMyValue" Precision="20" Scale="0">(DT_NUMERIC, 20, 0) TRIM(SUBSTRING(EntireRow,11,18))</Column>
                            </Columns>
                        </DerivedColumns>
                        <!--
                            Behold, the power of math
                        -->
                        <DerivedColumns Name="DER Divide approach">
                            <Columns>
                                <Column DataType="Decimal" Name="MyValue" Precision="18" Scale="2">(DT_NUMERIC, 18, 2)decTemporaryMyValue/100.0</Column>
                            </Columns>
                        </DerivedColumns>

                        <DerivedColumns Name="DER Dataviewer connector Math" />
                    </Transformations>
                </Dataflow>
            </Tasks>
        </Package>
    </Packages>
</Biml>