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JPA EntityManager: Why use persist() over merge()?
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I noticed that when I used em.merge, I got a SELECT statement for every INSERT, even when there was no field that JPA was generating for me--the primary key field was a UUID that I set myself. I switched to em.persist(myEntityObject) and got just INSERT statements then...
XSLT getting last element
...put the last() indexing on the nodelist result, rather than as part of the selection criteria. Try:
(//element[@name='D'])[last()]
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stdlib and colored output in C
...Color_end)
foo()
{
LOG_RED("This is in Red Color");
}
Like wise you can select different color codes and make this more generic.
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How to reset AUTO_INCREMENT in MySQL?
... it will set NULL auto-inc value on information_schema; check SELECT AUTO_INCREMENT FROM information_schema.tables WHERE table_name = 'my_table' AND table_schema = DATABASE( ) ;
– K-Gun
Dec 5 '15 at 0:42
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How to edit a JavaScript alert box title?
...rite("<script language=JavaScript> myAlert('Message Header Here','Hi select a valid date'); </script>");
Hope that helps you, or someone else!
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mongo group query how to keep fields
...t suggestions]
I came here looking for an answer but wasn't happy with the selected answer (especially given it's age). I found this answer that is a better solution (adapted):
db.test.aggregate({
$group: {
_id: '$name',
person: { "$first": "$$ROOT" },
count: { $sum: 1 }
},
{
"$r...
Remove duplicates from a List in C#
....GroupBy(s => s.City)
.Select(grp => grp.FirstOrDefault())
.OrderBy(s => s.City)
.ToList();
I have these fields in my list: Id, StoreName, Cit...
Filtering Pandas DataFrames on dates
...ils here http://pandas.pydata.org/pandas-docs/stable/dsintro.html#indexing-selection
If the column is not the index you have two choices:
Make it the index (either temporarily or permanently if it's time-series data)
df[(df['date'] > '2013-01-01') & (df['date'] < '2013-02-01')]
See he...
How to get the entire document HTML as a string?
...l the OP actually asks for "the entire HTML within the html tags". And the selected best answer by Colin Burnett does achieve this. This particular answer (Erik's) will include the html tags and the doctype. That said, this was totally a diamond in the rough for me and exactly what I was looking fo...
What is the tilde (~) in the enum definition?
...he UI
[] Cash
[] Check
[] CreditCard
and sum their values, and the user selects them all, you would see All in the resulting enum.
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