Question

我试图弄清楚如何从Datatable获取我需要的数据。我是数据表的新手，无法通过阅读文档来了解如何正确构建所需的查询。

我在PowerShell中制作了一个测试脚本，我发布在下面：

# clear the screen:
CLS

# Create the Datatable:
$dt1 = New-Object System.Data.Datatable

# Name the datatable:
$dt1.TableName = "MyTable"

# Add collumns to the table:
[void]$dt1.Columns.Add("datacolumnone")
[void]$dt1.Columns.Add("datacolumntwo")
[void]$dt1.Columns.Add("datacolumnthree")

# Add data:
[void]$dt1.Rows.Add([string]"id 1", [string]"fact 1", [string]"purple")
[void]$dt1.Rows.Add([string]"id 1", [string]"fact 2", [string]"black")
[void]$dt1.Rows.Add([string]"id 1", [string]"fact 3", [string]"green")
[void]$dt1.Rows.Add([string]"id 1", [string]"fact 4", [string]"green")
[void]$dt1.Rows.Add([string]"id 2", [string]"fact 1", [string]"blue")
[void]$dt1.Rows.Add([string]"id 2", [string]"fact 2", [string]"yellow")
[void]$dt1.Rows.Add([string]"id 2", [string]"fact 3", [string]"purple")
[void]$dt1.Rows.Add([string]"id 2", [string]"fact 4", [string]"yellow")
[void]$dt1.Rows.Add([string]"id 3", [string]"fact 1", [string]"purple")
[void]$dt1.Rows.Add([string]"id 3", [string]"fact 2", [string]"black")
[void]$dt1.Rows.Add([string]"id 3", [string]"fact 3", [string]"green")
[void]$dt1.Rows.Add([string]"id 3", [string]"fact 4", [string]"yellow")
[void]$dt1.Rows.Add([string]"id 4", [string]"fact 1", [string]"purple")
[void]$dt1.Rows.Add([string]"id 4", [string]"fact 2", [string]"yellow")
[void]$dt1.Rows.Add([string]"id 4", [string]"fact 3", [string]"purple")
[void]$dt1.Rows.Add([string]"id 4", [string]"fact 4", [string]"yellow")

# Write the data to a xml and data file:
$dt1.WriteXmlSchema('.\CacheSchema.xsd')
$dt1.WriteXml(".\CacheData.xml")

##############################
# End of this script         #
# Going on with the next one #
##############################

# Set the search criteria:
$column1 = ""
$column2 = "fact 1"
$column3 = "purple"

# build the query:
$qquery1 = "
        datacolumnone like '%"+$column1+"%' 
    AND datacolumntwo like '%"+$column2+"%'
    AND datacolumnthree like '%"+$column3+"%'
";

# Create the Datatable:
$dt2 = New-Object System.Data.Datatable

# Load the data:
[void]$dt2.ReadXmlSchema(".\CacheSchema.xsd")
[void]$dt2.ReadXml(".\CacheData.xml")

# Run the query:
$dt2.Select($qquery1)

现在我想要实现的是：

从具有以下值的行中查找所有ID（datacolumnone）：＆＃34; fact 1＆＃34; in＆＃34; datacolumntwo＆＃34;和＆＃34;紫色＆＃34;在＆＃34; datacolumnthree＆＃34;

然后进一步过滤id＆＃34; datacolumnone＆＃34;在上面的查询结果中，＆＃34; datacolumntwo＆＃34;是＆＃34;事实4＆＃34;和   ＆＃34; datacolumnthree＆＃34;是＆＃34;黄＆＃34;

然后，当我们有过滤后的ID时，显示在＆＃34; datacolumnone＆＃34;中的行。来自上面和之后的过滤查询的id   ＆＃34; datacolumntwo＆＃34;价值＆＃34;事实2＆＃34;

https://msdn.microsoft.com/en-us/library/system.data.datatable.select%28v=vs.110%29.aspx

从PowerShell中的数据表中选择数据

0 个答案: