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ここでは、関数ReadXML（）を作成しました。この関数はXMLファイルを読み込み、文字列を返します。文字列には、SQLクエリを動的に生成するXMLファイルノードの値がすべて含まれています。どのように私のコードが動作しています。これは正しい方法ですか？この関数で不要なコード（ループ...）を提案してください。より良い方法でコードを実行できるようにしてください。（How to）XDocumentを使用してXMLファイルを読み取り、動的SQLクエリをビルドしますか？
ここに関数があります。
Public Function ReadXML(ByVal tblName As String) As String
Dim strBuil As New StringBuilder
Dim listSource As New List(Of String)
Dim listTarget As New List(Of String)
Dim dictionary As New Dictionary(Of String, String)
Dim xmlDoc As XDocument = XDocument.Load("C:\\MappingFile.xml")
Dim q = (From c In xmlDoc.Descendants("Entity") Where c.Attribute("Source").Value = tblName
Select New With {
.EntityTarget = c.Attribute("Target").Value,
.PropertySource = c.Elements("Property").Attributes("Source"),
.PropertyTarget = c.Elements("Property").Attributes("Target")
})
For Each itm In q
Dim entitytarget As String = itm.EntityTarget
For Each propertysrce In itm.PropertySource
Dim prpsource As String = propertysrce.ToString().Remove(0, 8) //Here propertytrgt value is like Source="...". So I am removing unnecessary part and adding value to list.
prpsource = prpsource.Remove(prpsource.Length - 1)
listSource.Add(prpsource)
Next
listSource.Add(entitytarget)
For Each propertytrgt In itm.PropertyTarget //Here propertytrgt value is like Target="...". So I am removing unnecessary part and adding value to list.
Dim prptarget As String = propertytrgt.ToString().Remove(0, 8)
prptarget = prptarget.Remove(prptarget.Length - 1)
listTarget.Add(prptarget)
Next
listTarget.Add(entitytarget)
Next
// HERE adding two lists(listTarget and listSource) to Dictionary
For Each sourceValue In listSource
Dim Source As String = sourceValue
Dim count As Int32 = listTarget.Count
If I <> count Then
Dim Target As String = listTarget.Item(I)
dictionary.Add(Source, Target)
I = I + 1
End If
Next
'===============STRING BUILDER
strBuil.Append("select ")
For Each itm In dictionary
If n <= dictionary.Count - 2 Then
strBuil.Append(itm.Value.ToString + " " + "as " + itm.Key.ToString + ",")
n = n + 1
ElseIf n = dictionary.Count - 1 Then
strBuil = strBuil.Remove(strBuil.Length - 1, 1)
strBuil.Append(" from " + itm.Value.ToString)
Else
Exit For
End If
Next
Return strBuil.ToString()
End Function
Here is the XML file.
<?xml version="1.0" encoding="utf-8" ?>
<Entities>
<Entity Source="E_cdclient" Target="cd_client">
<Property Source="Name" Target="client_name"/>
<Property Source="Client_ShortDesc" Target="client_name_short"/>
<Property Source="PeriodStart" Target="client_period_start"/>
<Property Source="PeriodEnd" Target="client_period_end"/>
<Property Source="Comments" Target="client_remark"/>
</Entity>
<Entity Source="E_cdclient_cdclientcontact" Target="cd_client_contact">
<Property Source="Surname" Target="Surname"/>
<Property Source="Familyname" Target="Familyname"/>
<Property Source="Phone" Target="Phone"/>
<Property Source="EMail" Target="EMail"/>
<Property Source="Street" Target="Street"/>
<Property Source="City" Target="City"/>
<Property Source="ZIP" Target="ZIP"/>
<Property Source="Responsibility" Target="Responsibility"/>
</Entity>
</Entities>
おかげ&よろしく、 JN最初