Question

我试图进行迁移，但仍然有同样的错误：

 public function up()
{
    Schema::create('user_class', function (Blueprint $table) {

        $table->increments('id');
        $table->integer('user_id')->length(10)->unsigned();
        $table->foreign('user_id')->references('id')->on('users');
        $table->integer('class_id')->length(10)->unsigned();
        $table->foreign('class_id')->references('id')->on('classes');
    });
}

public function down()
{

    DB::statement('SET FOREIGN_KEY_CHECKS = 0');
    Schema::drop('user_class');
    DB::statement('SET FOREIGN_KEY_CHECKS = 1');

}

我的数据库迁移是：

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>                
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="150" />                    
    </Grid.ColumnDefinitions>

<!-- other controls in grid -->

<DockPanel Grid.Row="1" Grid.Column="1">
    <Grid>
        <Rectangle Width="120" Height="80" Fill="LightYellow" Stroke="Orange" StrokeThickness="2" RadiusX="8" RadiusY="8"/>
        <Rectangle Width="120" Height="80" Fill="Transparent" Stroke="Orange" StrokeThickness="2" RadiusX="8" RadiusY="8">
            <Rectangle.Effect>
                <DropShadowEffect ShadowDepth="0" BlurRadius="15" Color="Orange"/>
            </Rectangle.Effect>
            <Rectangle.Clip>
                <RectangleGeometry Rect="0,0,400,80" RadiusX="8" RadiusY="8"/>
            </Rectangle.Clip>
        </Rectangle>
        <Grid>
            <Label Content="Legend:"/>
            <BulletDecorator Margin="5,20,0,0" VerticalAlignment="Top"  >
                <BulletDecorator.Bullet>
                    <Ellipse Height="8" Width="8" Fill="Blue"/>
                </BulletDecorator.Bullet>
                <TextBox TextWrapping="Wrap"  Background="Transparent" Text="100 : Manager" BorderThickness="0" />
            </BulletDecorator>
            <BulletDecorator Margin="5,40,0,0" VerticalAlignment="Top" >
                <BulletDecorator.Bullet>
                    <Ellipse Height="8" Width="8" Fill="Blue"/>
                </BulletDecorator.Bullet>
                <TextBox TextWrapping="Wrap" Background="Transparent" Text="200: Others" BorderThickness="0" />
            </BulletDecorator>
        </Grid>
    </Grid>
</DockPanel>
</Grid>

我认为我有这个错误，因为user_classes先于我的数据库文件然后是类？这可能是我的问题吗？

当我制作：php artisan make：rollback - 这个表：user_class没有从我的phpAdmin中删除...只有这个

Answer 1

我认为长度方法是问题，我检查了Laravel文档并且它不存在。

Laravel migrate无法添加foregin密钥

1 个答案: