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POMango SQL CE: DeleteRule="Cascade" not working
 

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  1. POMango SQL CE: DeleteRule="Cascade" not working
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    <p>I'm trying to setup a FK relationship between two columns that will delete all children in the Db when a parent row is deleted. My definitions look like:</p> <pre><code> [Table] public class Parent { [Column(IsPrimaryKey = true, IsDbGenerated = true, DbType = "INT NOT NULL Identity", CanBeNull = false, AutoSync = AutoSync.OnInsert)] public int Id { get; set; } [Column] public string Dummy { get { return "dummy"; } set { } } private EntitySet&lt;Child&gt; _children; [Association(Name = "FK_Parent_Child", DeleteRule = "CASCADE", OtherKey = "ParentId", ThisKey="Id", Storage="_children")] public EntitySet&lt;Child&gt; Children { get { return _children; } set { _children.Assign(value); } } public Parent() { _children = new EntitySet&lt;Child&gt;( item =&gt; item.Parent = this, item =&gt; item.Parent = null); } } [Table] public class Child { [Column(IsPrimaryKey = true, IsDbGenerated = true, DbType = "INT NOT NULL Identity", CanBeNull = false, AutoSync = AutoSync.OnInsert)] public int Id { get; set; } [Column] public int? ParentId { get; set; } private EntityRef&lt;Parent&gt; _parent; [Association(Name="FK_Child_Parent", ThisKey = "ParentId", Storage = "_parent", OtherKey = "Id", IsForeignKey = true, DeleteRule="CASCADE")] public Parent Parent { get { return _parent.Entity; } set { var previousValue = _parent.Entity; if (previousValue != value || !this._parent.HasLoadedOrAssignedValue) { if (previousValue != null) _parent.Entity = null; _parent.Entity = value; if (value != null) ParentId = value.Id; else ParentId = null; } } } } </code></pre> <p>From what I can tell this seems implementation of FKs seems to work. Adding a parent row to the Db will automatically add child rows; selecting a parent row properly fills in the Children property with all related children. </p> <p>I would also like to be able to delete a parent row in the database and have that delete also remove all related children. With this setup, when I delete a parent I get the error "The primary key value cannot be deleted because references to this key still exist. [ Foreign key constraint name = FK_Child_Parent ]".</p> <p>It appears the DeleteRule="Cascade" isn't being honored, but I'm not sure why.</p>
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    1. USJames Cadd
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    1. COExtract the database file from the emulator, and script the constraints to check if the CASCADE rule has been created
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      1. POMango SQL CE: DeleteRule="Cascade" not working
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    2. COI ran into a similar problem. After attaching a log listener to DataContext.Log i saw that there was no ON CASCADE DELETE constraint created. After playing with different combinations of the attribute properties, i gave up. With Linq2SQL for Windows Phone DeleteRule="CASCADE" is NOT creating the constraint inside the DB! :/
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      1. USrObiwahn
 

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