Prevent DELETE And/or UPDATE

Jul 23, 2005

Hi all!
Are there any other way than using rights or Triggers to prevent a
DELETE or an UPDATE on a specific column.

The "problem" with rights is that they dont apply to all DB-users

The "problem" with triggers is that they generate lots of extra
SQL-code

I would like a solution something like below. If there are any
primitives like this or other more neat solutions I would be glad to
know



CREATE TABLE some_table NO DELETE
/* ^^^^^^^^^*/
(
some_column SOME_TYPE NO UPDATE
/* ^^^^^^^^^*/

)


For clarity, here is a trigger that currently solves the problem

CREATE TRIGGER check_updateable_columns ON some_table
FOR UPDATE
AS
IF UPDATE(some_column)
RAISERROR(...)
GO

or

CREATE TRIGGER delete_not_allowed ON some_table
INSTEAD OF DELETE
AS
RAISERROR(...)
GO

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Prevent Single Row Delete With Trigger

Jan 16, 2015

I have this table:

CREATE TABLE Workspaces (
AreaNr CHAR(2)
CONSTRAINT ck_a_areanr REFERENCES Areas(AreaNr)
ON DELETE CASCADE

[Code] ....

Now I want to create a trigger that prevents a delete on a single row (randomly chosen) from the table Workspaces. At the moment I have the following trigger, but this trigger still allows removal of single rows.

Current trigger:

CREATE TRIGGER deleteWorkspace ON Workspaces
FOR DELETE AS

BEGIN
DECLARE @Count int
SET @Count = @@ROWCOUNT;

[Code] ....

Desired result: I want to be able to prevent a delete on a single row on the table above.

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Apr 15, 2007

Hello
I noticed a spelling mistake in the data in a column of several tables, I used the following syntax to alter the spelling:
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The above code correctly updated the spelling error, but it also inserted a new row with the corrected data. 
So I found myself with two Identical rows containing the corrected information. I had to manually delete the extra row. Because if I had put in a DELETE statement, I would have then lost both rows.
What do I need to do to prevent this happening next time.  As I find that I need to update the names of some products, but I don't want to duplicate them.
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Jul 10, 2013

Is it possible to create a trigger to prevent update of a row if no signifiant colums are updated

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I'm trying to find a way to maintain the data that was UPDATEd in a table from being overwritten.

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My update works fine, but is there a way I can use the statement in my query so that it updates each time it is run to maintain the user email address? This will solve the problem of not having to change the original table that I do not have access to.

if exists (select * test..dbo.Employee)
truncate TABLE
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Is it possible to created a constraint, to prevent the row to be updated if ARCHIVED=true ? How can i do it ?

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Mar 6, 2007

Hi All,I have a Access front-end,the tables are from SQL server 2000 andlinked via ODBC using DSN.I have a Main table and several related tables.The Main table has aOne -to- Many relationship with the related tables.When I try to delete a record from the front-end,I get a error msg "the table is locked,you and another user are attempting to delete/update the same record".I am the single user and I am at a loss tounderstand what the problem is.I have to explain that I never had a problem when i was using Accessas the backend too.Is it because of linking?Any suggestions?Roy

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Jul 11, 2006

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If we want to maintain the data in relationships.
There are two ways to do it.
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I read an intresting article
http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=419
In this article Imar has choosen the second way (Manually).
And when I talk to Imar.
He said, "Cascading deletes would have worked equally well in this situation. However, I personally don't like them too much. I am much rather in control, enabling me to delete what I want and when I want it. I could, for example, keep certain data for "time travelling scenarios" (e.g. the state things were in some time ago) or I might want to keep it for other purposes."
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Waiting for helpful replies.

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Dec 13, 2007

Hi All,
I have this project I'm working on it's Product Content Management System rewrite. I got to the point of updating the Product By Sku and not sure if I should use UPDATE statement or I should DELETE sections assosiated with the ProductContentID and then re-insert them again? I'm not sure which is more afficient?
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We use SQL Server 2000 and we have about 4 bound tables where we keep the data. The one I'm talking about is the sections table where we keep the actual types of product content like a BoxShot, Description, Key Features and so on...
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Mar 21, 2008

I have two buttons on my page, one which will update content the other which will delete content from my slq database.
I get this error "CS1501: No overload for method 'updateBlockContent' takes '2' arguments" when I click on my update button.
I get this error "CS1501: No overload for method 'deleteBlockContent' takes '2' arguments" when I click on my delete button.
This is my method for updating - UPDATE [CMS] SET [BlockName] = @BlockName, [BlockContent] = @BlockContent WHERE (([BlockID] = @Original_BlockID))
This is my C# code behind the update button:protected void btnUpdateBlock_Click(object sender, EventArgs e)
{CMSTableAdapter ta = new CMSTableAdapter();
try
{
ta.updateBlockContent(txtBlockName.Text, txtBlockContent.Text);lblFeedback.Text = "Block Updated.";txtBlockName.Text = txtBlockContent.Text = "";
}
catch (Exception ex) { lblFeedback.Text = ex.ToString(); }
finally
{lblFeedback.Visible = true;
ta.Dispose();
}
}
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This is my C# code behind the delete button:protected void btnDeleteBlock_Click(object sender, EventArgs e)
{CMSTableAdapter ta = new CMSTableAdapter();
try
{
ta.deleteBlockContent(txtBlockName.Text, txtBlockContent.Text);lblFeedback.Text = "Block Deleted.";txtBlockName.Text = txtBlockContent.Text = "";
}
catch (Exception ex) { lblFeedback.Text = ex.ToString(); }
finally
{lblFeedback.Visible = true;
ta.Dispose();
}
}
Can somebody please explain why this is happening and how to remedy this problem.
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hi,

I have a dataadaptor which i use to fill a dataset. I can do this no problems. But if I delete a row from the dataset and update the adaptor again, nothing gets changed in my source database. Does anyone know why this is?

here's my code for my dataadaptor:
SqlConnection conn = new SqlConnection(connectionString);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = new SqlCommand("select * from tblExtRef", conn);
adapter.SelectCommand.Connection = conn;

SqlParameter parm;
SqlCommand cmd;
cmd = new SqlCommand("DELETE FROM tblextref WHERE extrefid = @extrefid",conn);
parm = cmd.Parameters.Add("@extrefid", SqlDbType.Int , 40, "extrefid");
parm.SourceColumn = "ExtRefid";
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//parm.Direction = ParameterDirection.InputOutput;
//SourceVersion = DataRowVersion.Original;
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I was able to get the UPDATE and DELETE to work but I have not figured out how to insert new records at the same time? Can I use an IF statement? I will apreciate any help or sample code, Thanks.

UPDATE MemberList
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INSERT ?

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Feb 16, 2007

I know how to do this in MySQL; but I was hoping there was a way to do it in MS SQL.

I want to be able to limit the number of rows an UPDATE or DELETE will effect regardless of the WHERE clause. I want to do this as a stop gap in the event that there is a logical error in the WHERE clause that would make it effect more rows than is humanly intended.

If I write a complex query that I know should drill down to only affecting one row, I just want to lock it in before I run it on database and take the risk of damaging some data.

In MySQL you would just do something like this:

Code:

DELETE FROM table_name WHERE ... LIMIT 1;



The only thing close to LIMIT I could come up with for MS SQL was TOP but it seems to only work for SELECT.

Any ideas would be greatly appreciated.

I ask this because if you screw up; manually saving 1, 2 or even 5 rows is a lot easier than having to rescue a whole table of data (even if it on a development server).

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Hi,
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Jan 22, 2008

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begin

INSERT INTO QBInvoicesQue(100s of feilds)

end


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2 DeleteCommand="DELETE FROM [tblSubRegions] WHERE [SubRegionID] = ?"
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7
8 <DeleteParameters>
9 <asp:Parameter Name="SubRegionID" Type="Int32" />
10 </DeleteParameters>
11
12 <UpdateParameters>
13 <asp:Parameter Name="RegionID" Type="Int32" />
14 <asp:Parameter Name="SubRegionName" Type="String" />
15 <asp:Parameter Name="SubRegionID" Type="Int32" />
16 </UpdateParameters>
17
18 <SelectParameters>
19 <asp:ControlParameter ControlID="dropRegions" Name="RegionID" PropertyName="SelectedValue" Type="Int32" />
20 </SelectParameters>
21
22 <InsertParameters>
23 <asp:Parameter Name="SubRegionID" Type="Int32" />
24 <asp:Parameter Name="RegionID" Type="Int32" />
25 <asp:Parameter Name="SubRegionName" Type="String" />
26 </InsertParameters>
27
28 </asp:SqlDataSource>
29
30
31
32 <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ehlConnectionString %>"
33 ProviderName="<%$ ConnectionStrings:ehlConnectionString.ProviderName %>"
34 SelectCommand="SELECT [RegionID], [RegionName] FROM [tblRegions]">
35
36 </asp:SqlDataSource>
37
38
39
40 <asp:DropDownList id="dropStates" runat="server" OnSelectedIndexChanged="dropStates_SelectedIndexChanged" AutoPostBack="True">
41 </asp:DropDownList>
42
43 <asp:DropDownList id="dropRegions" runat="server" OnSelectedIndexChanged="dropRegions_SelectedIndexChanged" AutoPostBack="True">
44 </asp:DropDownList>
45
46
47
48 <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
49 AutoGenerateColumns="False" EnableViewState=false Width="100%" DataSourceID="SqlDataSource1">
50 <Columns>
51 <asp:TemplateField HeaderText="SubRegionName" SortExpression="SubRegionName">
52 <EditItemTemplate>
53 <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource2"
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55 </asp:DropDownList>
56 </EditItemTemplate>
57 <ItemTemplate>
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59 </ItemTemplate>
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61 <asp:BoundField DataField="RegionName" HeaderText="RegionName" SortExpression="RegionName" />
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&nbsp;<br />
&nbsp;<br />
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
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<Columns>
<asp:CommandField ShowEditButton="True" />
<asp:BoundField DataField="BuyID" HeaderText="BuyID" InsertVisible="False" ReadOnly="True"
SortExpression="BuyID" />
<asp:BoundField DataField="BuyNL" HeaderText="BuyNL" SortExpression="BuyNL" />
<asp:BoundField DataField="BuyFR" HeaderText="BuyFR" SortExpression="BuyFR" />
<asp:BoundField DataField="Lastupdated" HeaderText="Lastupdated" SortExpression="Lastupdated" />
</Columns>
</asp:GridView>Can someone help me with this ? What is wrong with the Update command ?Thanks to all,Bart

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Server Error in '/CrystalReportsWebSite1' Application.


The data types text and nvarchar are incompatible in the equal to operator.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: The data types text and nvarchar are incompatible in the equal to operator.Source Error:



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[SqlException (0x80131904): The data types text and nvarchar are incompatible in the equal to operator.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +95
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +82
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +346
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +3244
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +186
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +1121
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +334
System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) +407
System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +149
System.Web.UI.WebControls.SqlDataSourceView.ExecuteDbCommand(DbCommand command, DataSourceOperation operation) +493
System.Web.UI.WebControls.SqlDataSourceView.ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) +915
System.Web.UI.DataSourceView.Update(IDictionary keys, IDictionary values, IDictionary oldValues, DataSourceViewOperationCallback callback) +179
System.Web.UI.WebControls.GridView.HandleUpdate(GridViewRow row, Int32 rowIndex, Boolean causesValidation) +1140

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I've got four pages with in the first page a insert, in the second a select, in the thirth a update and in the fourth a delete statement. First the values of a textbox will be inserted in the database, then the values will be shown in labels and than it is possible to edit or delete the values inserted. Every inserted item belonging to each other has one ID. The follwing values has a second ID etc.
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