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How are virtual functions and vtable implemented?
...he difference should be neglible. For a class which just contains a single char member, or no members at all, the difference might be notable.
Apart from that, it is important to note that not every call to a virtual function is a virtual function call. If you have an object of a known type, the co...
What do I have to do to get Core Data to automatically migrate models?
...oordinator: %@",error);
}
Then you need to do a little trick in xCode:
Select your xcdatamodel file
Select the Design Menu at the top - then Data Model - then choose Add Model Version
Your xcdatamodel file will then get moved into a new directory with the same name as your xcdatamodel file but w...
Create unique constraint with null columns
...houtMenu row first and then link it to a menu if necessary. It also makes selecting all the favorites in one query very difficult: I'd have to do something weird like select all the menu links first, and then select all the Favorites whose IDs don't exist within the first query. I'm not sure if I ...
How do I install and use curl on Windows?
...s window will popup. Click the Environment Variables button at the bottom.
Select the "Path" variable under "System variables" (the lower box). Click the Edit button.
Click the Add button and paste in the folder path where curl.exe lives.
Click OK as needed. Close open console windows and reopen, so...
OrderBy descending in Lambda expression?
... orderby person.Name descending, person.Age descending
select person.Name;
is equivalent to:
var query = people.OrderByDescending(person => person.Name)
.ThenByDescending(person => person.Age)
.Select(person => person.Name);
...
How does a PreparedStatement avoid or prevent SQL injection?
...o in detail.
Compilation Phase:
In this phase, keywords used in query like select, from, where etc are converted into format
understandable by machine.
This is the phase where query is interpreted and corresponding action to be taken is decided.
It also has many other tasks to do, but let's not go ...
Java JDBC - How to connect to Oracle using Service Name instead of SID
...ment = myConnection.createStatement();
String readRecordSQL = "select * from sa_work_order where WORK_ORDER_NO = '1503090' ";
ResultSet myResultSet = sqlStatement.executeQuery(readRecordSQL);
while (myResultSet.next()) {
System.out.println("Recor...
Getting “Lock wait timeout exceeded; try restarting transaction” even though I'm not using a transac
...heck your database transaction isolation level in the mysql cli:
mysql> SELECT @@GLOBAL.tx_isolation, @@tx_isolation, @@session.tx_isolation;
+-----------------------+-----------------+------------------------+
| @@GLOBAL.tx_isolation | @@tx_isolation | @@session.tx_isolation |
+----------------...
ASP.NET MVC Yes/No Radio Buttons with Strongly Bound Model MVC
...
The second parameter is selected, so use the ! to select the no value when the boolean is false.
<%= Html.RadioButton("blah", !Model.blah) %> Yes
<%= Html.RadioButton("blah", Model.blah) %> No
...
How to fix “Referenced assembly does not have a strong name” error?
...at does not "have a strong name key", do
Right click on the project file
Select Properties
Select "Signing tab" (on the left)
Click the check box "Sign the assembly"
Then <Browse> to the .snk file you found earlier
That should do the trick. This solved a problem for me for one project usin...