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JPA EntityManager: Why use persist() over merge()?
..., the difference is in what you do with the entity afterwards.
Persist takes an entity instance, adds it to the context and makes that instance managed (ie future updates to the entity will be tracked).
Merge returns the managed instance that the state was merged to. It does return something what...
Use of Application.DoEvents()
...he enduring mystique of DoEvents(). There's been an enormous amount of backlash against it, but nobody ever really explains why it is "bad". The same kind of wisdom as "don't mutate a struct". Erm, why does the runtime and the language supports mutating a struct if that's so bad? Same reason: yo...
How to create a DataTable in C# and how to add rows?
...= new DataTable();
dt.Clear();
dt.Columns.Add("Name");
dt.Columns.Add("Marks");
DataRow _ravi = dt.NewRow();
_ravi["Name"] = "ravi";
_ravi["Marks"] = "500";
dt.Rows.Add(_ravi);
To see the structure, or rather I'd rephrase it as schema, you can export it to an XML file by doing the following.
To ...
Get child node index
...
you can use the previousSibling property to iterate back through the siblings until you get back null and count how many siblings you've encountered:
var i = 0;
while( (child = child.previousSibling) != null )
i++;
//at the end i will contain the index.
Please note that in ...
jQuery checkbox change and click event
...
Tested in JSFiddle and does what you're asking for.This approach has the added benefit of firing when a label associated with a checkbox is clicked.
Updated Answer:
$(document).ready(function() {
//set initial state.
$('#textbox1').val(this.checked);
...
How do I use the CONCAT function in SQL Server 2008 R2?
I was looking for a CONCAT function in SQL Server 2008 R2. I found the link for this function . But when I use this function, it gives the following error:
...
Is it possible for a computer to “learn” a regular expression by user-provided examples?
...
The book An Introduction to Computational Learning Theory contains an algorithm for learning a finite automaton. As every regular language is equivalent to a finite automaton, it is possible to learn some regular expressions by a pr...
Why should a function have only one exit-point? [closed]
...ly a single exit point - you have a single path through the method and you know where to look for the exit. On the minus side if you use indentation to represent nesting, your code ends up massively indented to the right, and it becomes very difficult to follow all the nested scopes.
Another is tha...
How do I make CMake output into a 'bin' dir?
I'm currently constructing a project with a plugin structure. I'm using CMake to compile the project. The plugins are compiled in separate directories. My problem is that CMake compiles and saves the binaries and plugins, dynamic libraries, in the directory structure of the source. How do I make CMa...
possibly undefined macro: AC_MSG_ERROR
...
I had this same issue and found that pkg-config package was missing.
After installing the package, everything generated correctly.
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