db.savechanges() is not working
14,151
Solution 1
Unable to update the EntitySet because it has a DefiningQuery and no element exists in the element to support the current operation.
Make sure that your table has a primary key !
If not add the primary key and update the Entity Framework model and run again.
Solution 2
Try this instead of your method
Product_D obj= db.Product_D.FirtOrDefault(t => t.PCode == pCodeTextBox.Text);
if(obj==null){
obj=new Product_D();
db.Product_D.AddObject(obj);
}
obj.PCode = pCodeTextBox.Text;
obj.Name = nameTextBox.Text;
obj.Batch = batchTextBox.Text;
obj.Expiry = expiryTextBox.Text;
obj.Price = priceTextBox.Text;
db.SaveChanges();
Comments
-
Haris almost 2 years
I'm following this tutorial Creating Master-Details Windows Forms with the Entity Framework but the
db.Savechanges()isn't working if I modified some column or add a new row. According to this video tutorial it will work but it doesn't.Product_Form.cs
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace RemoteSynchronizer { public partial class Product : Form { ProductsEntities db = new ProductsEntities(); public Product() { InitializeComponent(); } private void Product_Form_Load(object sender, EventArgs e) { product_DBindingSource.DataSource = db.Product_D.ToList(); } private void bindingNavigatorAddNewItem_Click(object sender, EventArgs e) { } private void product_DBindingNavigatorSaveItem_Click(object sender, EventArgs e) { // Product_D obj = new Product_D(); // obj.PCode = pCodeTextBox.Text; // obj.Name = nameTextBox.Text; // obj.Batch = batchTextBox.Text; // obj.Expiry = expiryTextBox.Text; // obj.Price = priceTextBox.Text; //try // { // Product_D temp = db.Product_D.Single(t => t.PCode == pCodeTextBox.Text); // MessageBox.Show("Product Exists"); // } // catch // { // db.Product_D.Add(obj); db.SaveChanges(); //} } private void bindingNavigatorDeleteItem_Click(object sender, EventArgs e) { } } }When I try to use comment method in code it gives an error
Error
************** Exception Text ************** System.Data.Entity.Infrastructure.DbUpdateException: Unable to update the EntitySet 'Product_D' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation. ---> System.Data.UpdateException: Unable to update the EntitySet 'Product_D' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation. at System.Data.SqlClient.SqlGen.DmlSqlGenerator.ExpressionTranslator.Visit(DbScanExpression expression) at System.Data.Common.CommandTrees.DbScanExpression.Accept(DbExpressionVisitor visitor) at System.Data.SqlClient.SqlGen.DmlSqlGenerator.GenerateInsertSql(DbInsertCommandTree tree, SqlVersion sqlVersion, List`1& parameters) at System.Data.SqlClient.SqlGen.SqlGenerator.GenerateSql(DbCommandTree tree, SqlVersion sqlVersion, List`1& parameters, CommandType& commandType, HashSet`1& paramsToForceNonUnicode) at System.Data.SqlClient.SqlProviderServices.CreateCommand(DbProviderManifest providerManifest, DbCommandTree commandTree) at System.Data.SqlClient.SqlProviderServices.CreateCommand(DbCommandTree commandTree) at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree) at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(UpdateTranslator translator, Dictionary`2 identifierValues) at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues) at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) at System.Data.Entity.Internal.InternalContext.SaveChanges() --- End of inner exception stack trace --- at System.Data.Entity.Internal.InternalContext.SaveChanges() at System.Data.Entity.Internal.LazyInternalContext.SaveChanges() at System.Data.Entity.DbContext.SaveChanges() at RemoteSynchronizer.Product.product_DBindingNavigatorSaveItem_Click(Object sender, EventArgs e) in e:\Study\Project\RemoteSynchronizer\RemoteSynchronizer\Product_Form.cs:line 50 at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e) at System.Windows.Forms.ToolStripButton.OnClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e) at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met) at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met) at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ToolStrip.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) ************** Loaded Assemblies ************** mscorlib Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.18010 built by: FX45RTMGDR CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll ---------------------------------------- RemoteSynchronizer Assembly Version: 1.0.0.0 Win32 Version: 1.0.0.0 CodeBase: file:///E:/Study/Project/RemoteSynchronizer/RemoteSynchronizer/bin/Debug/RemoteSynchronizer.exe ---------------------------------------- System.Windows.Forms Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll ---------------------------------------- System.Drawing Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll ---------------------------------------- System Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.18016 built by: FX45RTMGDR CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll ---------------------------------------- System.Configuration Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll ---------------------------------------- System.Xml Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll ---------------------------------------- System.Web Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.Web/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Web.dll ---------------------------------------- System.Core Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll ---------------------------------------- EntityFramework Assembly Version: 5.0.0.0 Win32 Version: 5.0.20627.0 CodeBase: file:///E:/Study/Project/RemoteSynchronizer/RemoteSynchronizer/bin/Debug/EntityFramework.DLL ---------------------------------------- System.Data.Entity Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Data.Entity/v4.0_4.0.0.0__b77a5c561934e089/System.Data.Entity.dll ---------------------------------------- Anonymously Hosted DynamicMethods Assembly Assembly Version: 0.0.0.0 Win32 Version: 4.0.30319.18010 built by: FX45RTMGDR CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/mscorlib/v4.0_4.0.0.0__b77a5c561934e089/mscorlib.dll ---------------------------------------- Accessibility Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Accessibility/v4.0_4.0.0.0__b03f5f7f11d50a3a/Accessibility.dll ---------------------------------------- System.Data Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.Data/v4.0_4.0.0.0__b77a5c561934e089/System.Data.dll ---------------------------------------- System.Transactions Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.Transactions/v4.0_4.0.0.0__b77a5c561934e089/System.Transactions.dll ---------------------------------------- System.Numerics Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Numerics/v4.0_4.0.0.0__b77a5c561934e089/System.Numerics.dll ---------------------------------------- System.Data.OracleClient Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.Data.OracleClient/v4.0_4.0.0.0__b77a5c561934e089/System.Data.OracleClient.dll ---------------------------------------- System.Xml.Linq Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml.Linq/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.Linq.dll ---------------------------------------- System.EnterpriseServices Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.EnterpriseServices/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.EnterpriseServices.dll ---------------------------------------- EntityFrameworkDynamicProxies-RemoteSynchronizer Assembly Version: 1.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Data.Entity/v4.0_4.0.0.0__b77a5c561934e089/System.Data.Entity.dll ---------------------------------------- System.Runtime.Serialization Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 built by: FX45RTMREL CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Serialization/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Serialization.dll ---------------------------------------- System.ComponentModel.DataAnnotations Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.17929 CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.ComponentModel.DataAnnotations/v4.0_4.0.0.0__31bf3856ad364e35/System.ComponentModel.DataAnnotations.dll ---------------------------------------- Microsoft.SqlServer.Types Assembly Version: 11.0.0.0 Win32 Version: 2011.0110.2100.060 ((SQL11_RTM).120210-1917 ) CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.SqlServer.Types/11.0.0.0__89845dcd8080cc91/Microsoft.SqlServer.Types.dll ---------------------------------------- ************** JIT Debugging ************** To enable just-in-time (JIT) debugging, the .config file for this application or computer (machine.config) must have the jitDebugging value set in the system.windows.forms section. The application must also be compiled with debugging enabled. For example: <configuration> <system.windows.forms jitDebugging="true" /> </configuration> When JIT debugging is enabled, any unhandled exception will be sent to the JIT debugger registered on the computer rather than be handled by this dialog box.How to get rid of this problem? I'm trying to solve this by simple method
db.savechanges()but it won't work.