Question

我正在尝试使用以下代码在SQLite数据库上插入值：

var ImageIndex = 0;

function swipe(event){
    var touch = event.targetTouches[0];
    var midpoint = Math.floor(screen.width/2);
    var px = touch.pageX;
    var items = document.getElementsByClassName('image-wrapper');
    var itemActive = items[ImageIndex]; 
    if(px < midpoint){
        itemActive.style.marginLeft = '-100%';
        itemActive.style.transition = '1s';
        if (ImageIndex < (items.length - 1)) {
            ImageIndex = ImageIndex + 1;
        }else{
            ImageIndex = 0;
        }
    }else{
        itemActive.style.marginLeft = '0px';
        itemActive.style.transition = '1s';
        if (ImageIndex >= 1 ) {
            ImageIndex = ImageIndex - 1;
        }else{
            ImageIndex = items.length - 1;
        }
    }
}

这是xaml代码：

private void btnAdd_Click(object sender, RoutedEventArgs e)
{
     string database_connection = "Data Source=database.db;Version=3;";
     SQLiteConnection connection = new SQLiteConnection(database_connection);
     connection.Open();

     string query = String.Format("INSERT INTO `database`.`airports`(`id`, `airportName`, `airportCity`, `active`) VALUES ('"+txtAirportId+"','"+txtAirportName+"','"+txtAirportCity+"','"+1+"')");
     SQLiteCommand command = new SQLiteCommand(query, connection);
     SQLiteDataAdapter dataAdapter = new SQLiteDataAdapter(command);
     connection.Close();

     txtAirportId.Clear();
     txtAirportName.Clear();
     txtAirportCity.Clear();

}

因此，当我单击<DataGrid x:Name="dgAirports" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Height="100" Width="272" ItemsSource="{Binding}" AutoGenerateColumns="False" CanUserAddRows="false" VerticalScrollBarVisibility="Hidden"> <DataGrid.Columns> <DataGridTextColumn Header="Шифра" Binding="{Binding Path = id}" Width="*"/> <DataGridTextColumn Header="Назив" Binding="{Binding Path = airportName}" Width="*"/> <DataGridTextColumn Header="Град" Binding="{Binding Path = airportCity}" Width="*"/> </DataGrid.Columns> </DataGrid> <Label x:Name="lblAirportId" Content="ИД" HorizontalAlignment="Left" Margin="123,115,0,0" VerticalAlignment="Top"/> <TextBox x:Name="txtAirportId" Text="{Binding ElementName=dgAirports, Path=SelectedValue.id}" HorizontalAlignment="Left" Height="23" Margin="157,115,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="125"/> <Label x:Name="lblAirportName" Content="Назив" HorizontalAlignment="Left" Margin="109,142,0,0" VerticalAlignment="Top"/> <TextBox x:Name="txtAirportName" Text="{Binding ElementName=dgAirports, Path=SelectedValue.airportName}" HorizontalAlignment="Left" Height="23" Margin="157,143,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="125"/> <Label x:Name="lblAirportCity" Content="Град" HorizontalAlignment="Left" Margin="115,168,0,0" VerticalAlignment="Top"/> <TextBox x:Name="txtAirportCity" Text="{Binding ElementName=dgAirports, Path=SelectedValue.airportCity}" HorizontalAlignment="Left" Height="23" Margin="157,171,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="125"/> <Button x:Name="btnShow" Content="Прикажи" HorizontalAlignment="Left" Margin="10,115,0,0" VerticalAlignment="Top" Width="75" Click="btnShow_Click"/> <Button x:Name="btnAdd" Content="Додај" HorizontalAlignment="Left" Margin="10,142,0,0" VerticalAlignment="Top" Width="75" Click="btnAdd_Click"/> </Grid>时，什么也没有发生，但没有任何错误。那么，我所缺少的以及如何将这些值插入“机场”表中？

Answer 1

只需像这样更改您的功能：

private void btnAdd_Click(object sender, RoutedEventArgs e)
{
    string database_connection = "Data Source=database.db;Version=3;";
    SQLiteConnection connection = new SQLiteConnection(database_connection);
    connection.Open();

    string query = String.Format($"INSERT INTO `database`.`airports`(`id`, `airportName`, `airportCity`, `active`) VALUES ('{txtAirportId }','{txtAirportName }','{txtAirportCity}','1')");
    SQLiteCommand command = new SQLiteCommand(query, connection);
    command.ExecuteNonQuery();

    txtAirportId.Clear();
    txtAirportName.Clear();
    txtAirportCity.Clear();
}

顺便说一句：您的代码仍然不好。如果仅联系字符串，至少您将具有SQL Injection漏洞。使用参数或阅读有关Entity Framework Core技术的信息。

如何在按钮单击（WPF）时将值插入SQLite

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