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QueryWindow: Allow users to export query result to csv file
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This commit is contained in:
Lorenz Stechauner
2025-12-16 16:50:15 +01:00
parent 9af498287d
commit 5cec5b3556
4 changed files with 98 additions and 27 deletions
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22
Elwig/Helpers/Export/Csv.cs
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@@ -15,7 +15,9 @@ namespace Elwig.Helpers.Export {
protected readonly char Separator;
protected string? Header;
public Csv(string filename, char separator = ';') : this(filename, separator, Utils.UTF8) { }
public Csv(string filename, char separator = ';') :
this(filename, separator, Utils.UTF8) {
}
public Csv(string filename, char separator, Encoding encoding) {
_writer = new StreamWriter(filename, false, encoding);
@@ -58,4 +60,22 @@ namespace Elwig.Helpers.Export {
public abstract string FormatRow(T row);
}
public class CsvSimple : Csv<IEnumerable<object?>> {
public CsvSimple(string filename, char separator, Encoding encoding) :
base(filename, separator, encoding) {
}
public CsvSimple(string filename, char separator = ';') :
base(filename, separator) {
}
public override string FormatRow(IEnumerable<object?> row) {
return string.Join(Separator, row.Select(i => {
var str = $"{i}";
return str.Contains(Separator) || str.Contains('\n') ? $"\"{str.Replace("\"", "\"\"")}\"" : str;
}));
}
}
}

1
Elwig/Helpers/Utils.cs
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@@ -36,6 +36,7 @@ namespace Elwig.Helpers {
public static partial class Utils {
public static readonly Encoding UTF8 = new UTF8Encoding(false, true);
public static readonly Encoding UTF8BOM = new UTF8Encoding(true, true);
public static readonly JsonSerializerOptions JsonOpts = new() { Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping };
public static int CurrentYear => DateTime.Now.Year;

26
Elwig/Windows/QueryWindow.xaml
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@@ -5,27 +5,35 @@
Title="Datenbankabfragen - Elwig" Height="450" Width="800" MinWidth="400" MinHeight="300">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="1*" MinHeight="100"/>
<RowDefinition Height="5"/>
<RowDefinition Height="3*" MinHeight="100"/>
<RowDefinition Height="1*" MinHeight="50"/>
<RowDefinition Height="5"/>
<RowDefinition Height="1*" MinHeight="50"/>
<RowDefinition Height="5"/>
<RowDefinition Height="6*" MinHeight="100"/>
</Grid.RowDefinitions>
<TextBox x:Name="QueryInput" Text="SELECT * FROM v_delivery"
<TextBox x:Name="QueryInput" Text="SELECT * FROM v_member" Grid.Row="1" Grid.RowSpan="3"
AcceptsReturn="True" VerticalScrollBarVisibility="Visible" TextWrapping="Wrap"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,10,120,5"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,5,120,5"
FontFamily="Cascadia Code Light" FontSize="13">
<TextBox.InputBindings>
<KeyBinding Key="Return" Modifiers="Control" Command="{Binding EnterCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:QueryWindow}}}" />
<KeyBinding Key="Return" Modifiers="Control" Command="{Binding EnterCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:QueryWindow}}}" />
<KeyBinding Key="S" Modifiers="Control" Command="{Binding SaveCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:QueryWindow}}}" />
</TextBox.InputBindings>
</TextBox>
<Button x:Name="QueryButton" Content="Abfragen"
HorizontalAlignment="Right" VerticalAlignment="Stretch" Margin="10,10,10,5"
<Button x:Name="QueryButton" Content="Abfragen" Grid.Row="1"
HorizontalAlignment="Right" VerticalAlignment="Stretch" Margin="10,5,10,0"
Click="QueryButton_Click" Width="100"
FontSize="14"/>
<Button x:Name="SaveButton" Content="Speichern" Grid.Row="3"
HorizontalAlignment="Right" VerticalAlignment="Stretch" Margin="10,0,10,5"
Click="SaveButton_Click" Width="100"
FontSize="14"/>
<GridSplitter Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
<GridSplitter Grid.Row="4" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
<DataGrid x:Name="DataList" Grid.Row="2"
<DataGrid x:Name="DataList" Grid.Row="5"
AutoGenerateColumns="False" HeadersVisibility="Column" IsReadOnly="True" GridLinesVisibility="None" SelectionMode="Extended"
CanUserDeleteRows="False" CanUserResizeRows="False" CanUserAddRows="False"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,5,10,10"/>

76
Elwig/Windows/QueryWindow.xaml.cs
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@@ -1,7 +1,10 @@
using Elwig.Helpers;
using Elwig.Helpers.Export;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
@@ -13,7 +16,12 @@ namespace Elwig.Windows {
private ICommand? _enterCommand;
public ICommand EnterCommand => _enterCommand ??= new ActionCommand(async () => {
await ExecuteQuery();
await DisplayQuery();
});
private ICommand? _saveCommand;
public ICommand SaveCommand => _saveCommand ??= new ActionCommand(async () => {
await SaveQuery();
});
@@ -22,33 +30,45 @@ namespace Elwig.Windows {
}
private async void QueryButton_Click(object sender, RoutedEventArgs evt) {
await ExecuteQuery();
await DisplayQuery();
}
private async Task ExecuteQuery() {
private async void SaveButton_Click(object sender, RoutedEventArgs evt) {
await SaveQuery();
}
private async Task DisplayQuery() {
try {
await ExecuteQuery(QueryInput.Text);
Mouse.OverrideCursor = Cursors.Wait;
await DisplayQuery(QueryInput.Text);
Mouse.OverrideCursor = null;
} catch (Exception e) {
Mouse.OverrideCursor = null;
MessageBox.Show(e.Message, "Fehler beim Ausführen", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
private async Task ExecuteQuery(string sqlQuery) {
private async Task SaveQuery() {
await SaveQuery(QueryInput.Text);
}
private static async Task<(IList<DbColumn>, IEnumerable<object[]>)> ExecuteQuery(string sqlQuery) {
var rows = new List<object[]>();
IList<DbColumn> header;
using (var cnx = await AppDbContext.ConnectAsync()) {
using var cmd = cnx.CreateCommand();
cmd.CommandText = sqlQuery;
using var reader = await cmd.ExecuteReaderAsync();
header = await reader.GetColumnSchemaAsync();
while (await reader.ReadAsync()) {
var values = new object[reader.FieldCount];
reader.GetValues(values);
rows.Add(values);
}
using var cnx = await AppDbContext.ConnectAsync();
using var cmd = cnx.CreateCommand();
cmd.CommandText = sqlQuery;
using var reader = await cmd.ExecuteReaderAsync();
var header = await reader.GetColumnSchemaAsync();
while (await reader.ReadAsync()) {
var values = new object[reader.FieldCount];
reader.GetValues(values);
rows.Add(values);
}
return (header, rows);
}
private async Task DisplayQuery(string sqlQuery) {
var (header, rows) = await ExecuteQuery(sqlQuery);
var styleRight = new Style();
styleRight.Setters.Add(new Setter(TextBlock.TextAlignmentProperty, TextAlignment.Right));
@@ -63,5 +83,27 @@ namespace Elwig.Windows {
}
DataList.ItemsSource = rows;
}
private static async Task SaveQuery(string sqlQuery) {
var d = new SaveFileDialog() {
FileName = $"Abfrage.csv",
DefaultExt = "csv",
Filter = "CSV-Datei (*.csv)|*.csv",
Title = $"Datenbank Abfrage speichern unter - Elwig"
};
if (d.ShowDialog() == true) {
Mouse.OverrideCursor = Cursors.Wait;
await Task.Run(async () => {
try {
var (header, rows) = await ExecuteQuery(sqlQuery);
using var csv = new CsvSimple(d.FileName, ';', Utils.UTF8BOM);
await csv.ExportAsync(rows.Prepend([.. header.Select(h => h.ColumnName)]));
} catch (Exception exc) {
MessageBox.Show(exc.Message, "Fehler beim Ausführen", MessageBoxButton.OK, MessageBoxImage.Error);
}
});
Mouse.OverrideCursor = null;
}
}
}
}