回答編集履歴
2
【追記２】追加
answer
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@@ -7,7 +7,7 @@
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左外部結合の実行
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[https://docs.microsoft.com/ja-jp/dotnet/csharp/linq/perform-left-outer-joins](https://docs.microsoft.com/ja-jp/dotnet/csharp/linq/perform-left-outer-joins)
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【追記】
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**【追記】**
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上記案でのサンプルを書いておきます。Oracle の方は Entity Framework を使えれば簡単に、CSV の方も DataSet / DataTable を作るのよりは多分少ない労力で List<T> 型のオブジェクトを作れると思います。
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@@ -87,4 +87,174 @@
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</form>
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</body>
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</html>
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```
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**【追記２】**
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VB.NET に直したサンプルを下にアップしておきます。変換サービスで変換して動くように手直ししただけです。なので、VB.NET の書き方としてはアレかもしれませんが、期待通りの結果になることは確認済みです。
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```
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<%@ Page Language="VB" %>
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<!DOCTYPE html>
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102
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<script runat="server">
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104
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Public Class Employee
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Public Property Id() As String
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Get
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Return m_Id
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End Get
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Set
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m_Id = Value
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End Set
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End Property
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Private m_Id As String
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Public Property Dept() As String
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Get
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Return m_Dept
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End Get
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Set
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m_Dept = Value
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End Set
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End Property
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Private m_Dept As String
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Public Property Name() As String
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Get
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Return m_Name
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End Get
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Set
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m_Name = Value
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End Set
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End Property
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Private m_Name As String
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End Class
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Public Class Role
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Public Property Id() As String
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Get
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Return m_Id
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End Get
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Set
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m_Id = Value
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End Set
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End Property
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Private m_Id As String
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Public Property Right() As String
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Get
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Return m_Right
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End Get
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Set
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m_Right = Value
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End Set
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End Property
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Private m_Right As String
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End Class
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Public Class JoinedTable
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Public Property Id() As String
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Get
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Return m_Id
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End Get
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Set
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m_Id = Value
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End Set
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End Property
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Private m_Id As String
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Public Property Dept() As String
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Get
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Return m_Dept
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End Get
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Set
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m_Dept = Value
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End Set
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End Property
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Private m_Dept As String
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Public Property Name() As String
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Get
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Return m_Name
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End Get
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Set
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m_Name = Value
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End Set
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End Property
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Private m_Name As String
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Public Property Right() As String
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Get
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Return m_Right
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End Get
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Set
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m_Right = Value
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End Set
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End Property
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Private m_Right As String
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End Class
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Protected Sub Page_Load(sender As Object, erg As EventArgs)
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If Not IsPostBack Then
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Dim employees As New List(Of Employee)() From {
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New Employee() With {
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.Id = "ID0001",
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.Dept = "部署A",
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.Name = "鈴木太郎"
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},
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New Employee() With {
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.Id = "ID0002",
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.Dept = "部署A",
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.Name = "山田一郎"
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},
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New Employee() With {
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.Id = "ID0003",
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.Dept = "部署B",
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.Name = "佐藤花子"
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}
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}
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Dim roles As New List(Of Role)() From {
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New Role() With {
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.Id = "ID0001",
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.Right = "〇"
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},
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New Role() With {
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.Id = "ID0003",
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.Right = "×"
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},
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New Role() With {
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.Id = "ID0004",
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.Right = "〇"
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}
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}
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Dim query = From e In employees
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Group Join r In roles
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On e.Id Equals r.Id Into Group
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From subrole In Group.DefaultIfEmpty()
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Select New JoinedTable() With {
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.Id = e.Id,
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.Dept = e.Dept,
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.Name = e.Name,
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.Right = If(subrole Is Nothing, String.Empty, subrole.Right)
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}
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GridView1.DataSource = query
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GridView1.DataBind()
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End If
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End Sub
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</script>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<title></title>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<asp:GridView ID="GridView1" runat="server"></asp:GridView>
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</div>
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</form>
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</body>
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</html>
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```
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1
サンプル追記
answer
CHANGED
|
@@ -5,4 +5,86 @@
|
|
|
5
5
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DataSet / DataTable を作ってそれを操作しようとするより、以下のように List<T> 型として「テーブル１」と「テーブル２」のレコードを取得し、Linq を使って結合した方がよさそうです。
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6
6
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7
7
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左外部結合の実行
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8
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-
[https://docs.microsoft.com/ja-jp/dotnet/csharp/linq/perform-left-outer-joins](https://docs.microsoft.com/ja-jp/dotnet/csharp/linq/perform-left-outer-joins)
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[https://docs.microsoft.com/ja-jp/dotnet/csharp/linq/perform-left-outer-joins](https://docs.microsoft.com/ja-jp/dotnet/csharp/linq/perform-left-outer-joins)
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9
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+
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10
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+
【追記】
|
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11
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+
|
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12
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+
上記案でのサンプルを書いておきます。Oracle の方は Entity Framework を使えれば簡単に、CSV の方も DataSet / DataTable を作るのよりは多分少ない労力で List<T> 型のオブジェクトを作れると思います。
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```
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<%@ Page Language="C#" %>
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<!DOCTYPE html>
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<script runat="server">
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public class Employee
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{
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public string Id { get; set; }
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public string Dept { get; set; }
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public string Name { get; set; }
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}
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public class Role
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{
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public string Id { get; set; }
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public string Right { get; set; }
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}
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public class JoinedTable
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{
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public string Id { get; set; }
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public string Dept { get; set; }
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public string Name { get; set; }
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public string Right { get; set; }
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}
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protected void Page_Load(object sender, EventArgs erg)
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{
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if (!IsPostBack)
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{
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List<Employee> employees = new List<Employee>()
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{
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new Employee() { Id = "ID0001", Dept = "部署A", Name = "鈴木太郎" },
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new Employee() { Id = "ID0002", Dept = "部署A", Name = "山田一郎" },
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new Employee() { Id = "ID0003", Dept = "部署B", Name = "佐藤花子" }
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};
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List<Role> roles = new List<Role>()
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{
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new Role() { Id = "ID0001", Right ="〇" },
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new Role() { Id = "ID0003", Right ="×" },
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new Role() { Id = "ID0004", Right ="〇" }
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};
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var query = from e in employees
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join r in roles on e.Id equals r.Id into gj
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from sub in gj.DefaultIfEmpty()
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select new JoinedTable
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{
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Id = e.Id,
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Dept = e.Dept,
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Name = e.Name,
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Right = sub?.Right ?? string.Empty
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};
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GridView1.DataSource = query;
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GridView1.DataBind();
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}
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}
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</script>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<title></title>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<asp:GridView ID="GridView1" runat="server"></asp:GridView>
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</div>
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</form>
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</body>
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</html>
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90
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```
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