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  • Is the ruby operator ||= intelligent?

    - by brad
    I have a question regarding the ||= statement in ruby and this is of particular interest to me as I'm using it to write to memcache. What I'm wondering is, does ||= check the receiver first to see if it's set before calling that setter, or is it literally an alias to x = x || y This wouldn't really matter in the case of a normal variable but using something like: CACHE[:some_key] ||= "Some String" could possibly do a memcache write which is more expensive than a simple variable set. I couldn't find anything about ||= in the ruby api oddly enough so I haven't been able to answer this myself. Of course I know that: CACHE[:some_key] = "Some String" if CACHE[:some_key].nil? would achieve this, I'm just looking for the most terse syntax.

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  • How to delete from table if count is greater than 20

    - by joseph
    Hi, I have a mysql table that I need to only contain 20 newest records before adding additional records. New rows are added daily so I would like it first delete any records that are greater than the 20 allowed starting with the earliest. The table contains an auto increment "id" column so I can easily determine which is the earliest records. Thanks for any help.

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  • Providing *implicit* conversion operator for template specialization

    - by Neil G
    I have a templated sparse_vector<T> class, and I am also using Boost UBLAS. How would I provide implicit conversions between sparse_vector<double> and boost::numeric::ublas::compressed_vector<double>? I would also like to provide similar conversions between std::vector<double> and boost::numeric::ublas::vector<double>. (I am using gcc 4.4 with C++0x enabled.)

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  • ASP.NET - programmatically generated delete button

    - by WedTM
    I'm trying to create a simple button that deletes a row from the database. I would like to set the ID of the control to something like delete_MATERIALID_button however, when I do this: <asp:Button ID='delete_<%# Eval("MatID") %>_button' runat="server" Text="Delete" /> I get an error that the name can't be generated like that. I know that there must be a simple solution, I just can't figure it out.

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  • Cannot delete a remote branch created unintentionally

    - by Himel
    $ git branch -a * SocialAct master remotes/origin/HEAD -> origin/master remotes/origin/SocialAct remotes/origin/social I want to delete the remote branch "remotes/origin/social", and applied folloing command: $ git branch -d -r origin/social Deleted remote branch origin/social (was 26f6f61). But I have no idea how to bring these changes remotely so that the branches are deleted from origin and everyone can see the changes. I tried git push but that does not work Any help.

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  • Delete my application programmatically (Android)

    - by Vaghela M.R - Android Devloper
    I want to uninstall my application on button click. For this I am using following code. Uri packageURI = Uri.parse("package:"+packageName); Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI); startActivity(uninstallIntent); It gives me result, but I want to delete directly without click on "Ok" button of dialog with message "This application will be Uninstalled". I just want uninstalling application directly.

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  • Array increment operator

    - by Stardust
    Could any one please tell me the meaning of "++" with array in the following code in Java: int [ ] arr = new int[ 4 ]; for(int i = 0; i < arr.length; i++){ arr[ i ] = i + 1; System.out.println(arr[ i ]++); } what is arr[ i ]++ meaning in above code, and why we can't do like: arr[ i ]++ = i + 1;

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  • DBConcurrencyException happening on second delete

    - by Malfist
    My code keeps throwing a DBConcurrencyException ("Concurrency violation: the DeleteCommand affected 0 of the expected 1 records.) when I make a second update to the data table. The problem actually happens on a table that is linked to a parent table. The two tables, CashReceipts and CashReceiptsApplyTo are displayed on the same winform, and when I delete two cash receipts the update on cash receipt apply to's table fails with the dbconcurrencyexception (the table is updated everytime the binding source [linked to a binding navigator] changes position). Here is my code: protected override void saveToDatabase() { tblCashReceiptsBindingSource.EndEdit(); tblCashReceiptsTableAdapter.Update(rentalEaseDataSet.tblCashReceipts); //update the datatable foreach (DataGridViewRow viewRow in viewApplications.Rows) { if (viewRow.Cells[colAppID.Index].Value == null || viewRow.Cells[colApplyTo.Index].Value == null) { continue; } else if ((int)viewRow.Cells[colAppID.Index].Value == -1) { insertNewRow(viewRow); } else { updateRow(viewRow); } } try { tblCashReceiptsApplyToTableAdapter.Update(rentalEaseDataSet.tblCashReceiptsApplyTo); //tblCashReceiptsApplyToTableAdapter.Fill(rentalEaseDataSet.tblCashReceiptsApplyTo); ); } catch (Exception e) { Bitmap bitmap = new Bitmap(this.Width, this.Height); this.DrawToBitmap(bitmap, new Rectangle(0, 0, this.Width, this.Height)); saveScreenshot(this.GetType().FullName, e.Message, bitmap); MessageBox.Show("There was an error saving your changes. This means that you should close the form, and re-enter the last Receipt you entered.\n\nPlease report this."); } } The insertNewRow, and updateRow are simple: private void updateRow(DataGridViewRow viewRow) { //be forgiving if ((int)viewRow.Cells[colAppID.Index].Value == -1) { insertNewRow(viewRow); return; } //find row in table, if it's not there, crash and burn RentalEaseDataSet.tblCashReceiptsApplyToRow updateRow = rentalEaseDataSet.tblCashReceiptsApplyTo.Select("ID = " + viewRow.Cells[colAppID.Index].Value.ToString())[0] as RentalEaseDataSet.tblCashReceiptsApplyToRow; updateRow.BeginEdit(); updateRow.CashReceiptsID = (int)viewRow.Cells[colCashReceipt.Index].Value; updateRow.ApplyTo = (int)viewRow.Cells[colApplyTo.Index].Value; updateRow.Paid = CurrencyToDecimal(viewRow.Cells[colPaid.Index].Value); if (viewRow.Cells[colMemo.Index].Value != null) { updateRow.Memo = viewRow.Cells[colMemo.Index].Value.ToString(); } else { updateRow.SetMemoNull(); } updateRow.EndEdit(); } private void insertNewRow(DataGridViewRow viewRow) { //be forgiving if ((int)viewRow.Cells[colAppID.Index].Value != -1) { updateRow(viewRow); return; } RentalEaseDataSet.tblCashReceiptsApplyToRow newRow = rentalEaseDataSet.tblCashReceiptsApplyTo.NewRow() as RentalEaseDataSet.tblCashReceiptsApplyToRow; newRow.CashReceiptsID = (int) viewRow.Cells[colCashReceipt.Index].Value; newRow.ApplyTo = (int) viewRow.Cells[colApplyTo.Index].Value; newRow.Paid = CurrencyToDecimal(viewRow.Cells[colPaid.Index].Value); if (viewRow.Cells[colMemo.Index].Value != null) { newRow.Memo = viewRow.Cells[colMemo.Index].Value.ToString(); } rentalEaseDataSet.tblCashReceiptsApplyTo.Rows.Add(newRow); //update the ID viewRow.Cells[colAppID.Index].Value = newRow.ID; } Any idea why it would throw that error on the second delete?

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  • Wordpress Query Compare operator not working?

    - by Liam
    I have the following wordpress query... $args = array('orderby' => 'meta_value_num', 'meta_key' => 'order', 'order' => 'ASC', 'meta_query' => array( array( 'key' => $customkey, 'value' => $customvalue, 'compare' => '=' ), array( 'key' => $customkey1, 'value' => $customvalue1, 'compare' => '=' ), array( 'key' => 'coverageRegion', 'value' => 'national', 'compare' => '=' ), array( 'key' => 'vehicleType', 'value' => 'psv', 'compare' => '!=' ) ) ); I want to return posts where there custom field 'Vechicle Type' is not PSV, The above however returns posts with exactly that, has anybody come across this before? Seems im not the only one neither... http://wordpress.org/support/topic/meta_query-without-key-results-in-compare-of-not-like-not-working

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