单击删除按钮时,出现此错误。
SqlException:DELETE语句与REFERENCE约束“ FK_Reserva_Quarto”冲突。在数据库“GestãoHotel”的表“ dbo.Reserva”的“ ID_Quarto”列中发生了冲突。
有人知道原因吗?
控制器:
// GET: Quartos/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Quarto quarto = db.Quarto.Find(id);
if (quarto == null)
{
return HttpNotFound();
}
return View(quarto);
}
// POST: Quartos/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
Quarto quarto = db.Quarto.Find(id);
db.Quarto.Remove(quarto);
db.SaveChanges();
return RedirectToAction("Index");
}
查看:
<div class="table-responsive panel">
<table class="table">
<tbody>
<tr>
<td class="text-success"><i class="fa fa-list-ol"></i> Nº Quarto</td>
<td>@Model.ID_Quarto</td>
</tr>
<tr>
<td class="text-success"><i class="fa fa-bed"></i> Tipo de Quarto</td>
<td>@Model.TipoQuarto</td>
</tr>
</tbody>
</table>
</div>
<table class="table">
<tbody>
<tr>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<td class="text-center">
<button type="submit" class="btn btn-danger btn-circle btn-xl" data-toggle="tooltip" title="Eliminar"> <i class="glyphicon glyphicon-ok"></i></button>
<button type="button" onclick="location.href='@Url.Action("Index", "Quartos")'" class="btn btn-primary btn-circle btn-xl" data-toggle="tooltip" title="Voltar"><i class="glyphicon glyphicon-arrow-left"></i></button>
</td>
}
</tr>
</tbody>
</table>
连接字符串:
<connectionStrings>
<add name="Hotel"
connectionString="Data Source=DESKTOP-BC284NS\SQLEXPRESS;initial catalog=GestãoHotel;integrated security=True;"
providerName="System.Data.EntityClient" />
<add name="HotelEntities"
connectionString="metadata=res://*/Models.BaseDados.GestãoHotel.csdl|res://*/Models.BaseDados.GestãoHotel.ssdl|res://*/Models.BaseDados.GestãoHotel.msl;provider=System.Data.SqlClient;provider connection string="Data Source=DESKTOP-BC284NS\SQLEXPRESS;initial catalog=GestãoHotel;integrated security=True;App=EntityFramework""
providerName="System.Data.EntityClient" />
</connectionStrings>
答案 0 :(得分:1)
您必须先删除Reservas
,然后才能删除Quarto
,如下所示:
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
List<Reserva> Reservas = db.Reserva.Where(r => r.ID_Quarto == id).ToList();
db.Reserva.RemoveRange(Reservas);
Quarto quarto = db.Quarto.Find(id);
db.Quarto.Remove(quarto);
db.SaveChanges();
return RedirectToAction("Index");
}
此外,作为永久解决方案,请在DbContext
中添加以下配置,然后运行迁移并相应地更新数据库:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<Reserva>().HasRequired(j => j.Quarto)
.WithMany(c => c.Reservas)
.HasForeignKey(j => j.ID_Quarto).WillCascadeOnDelete(true);
}
希望您的问题得到解决!
答案 1 :(得分:0)
我认为您对此有选择。 -选项1:使用ON DELETE CASCADE -选项2:按正确顺序删除。这意味着您应该先从Reserva中删除行,然后再从Quarto中删除行。
您可以关注此示例。希望对您有帮助,我的朋友:))
//选项1:
ALTER TABLE <child_table> WITH CHECK
ADD CONSTRAINT <fk_name> FOREIGN KEY(<column(s)>)
REFERENCES <parent_table> (<column(s)>)
ON DELETE CASCADE
选项2:
// POST: Quartos/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
//Delete the rows from Reserva first
var reservaObj = db.Reserva.Where(t => t.ID_Quarto == id).ToList();
db.Reserva.RemoveRange(reservaObj);
Quarto quarto = db.Quarto.Find(id);
db.Quarto.Remove(quarto);
db.SaveChanges();
return RedirectToAction("Index");
}