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Persistence unit as RESOURCE_LOCAL or JTA?
...he application server's JTA implementation.
In most cases, RESOURCE_LOCAL is fine. This would use basic JDBC-level transactions. The downside is that the transaction is local to the JPA persistence unit, so if you want a transaction that spans multiple persistence units (or other databases), then R...
How can I exclude directories from grep -R?
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SOLUTION 1 (combine find and grep)
The purpose of this solution is not to deal with grep performance but to show a portable solution : should also work with busybox or GNU version older than 2.5.
Use find, for excluding directories foo and bar :
find /dir \( -name foo -prune \...
Manually map column names with class properties
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This works fine:
var sql = @"select top 1 person_id PersonId, first_name FirstName, last_name LastName from Person";
using (var conn = ConnectionFactory.GetConnection())
{
var person = conn.Query<Person>(sql).ToList(...
How to estimate how much memory a Pandas' DataFrame will need?
..., a 400MB csv file into a pandas dataframe (using read_csv or read_table), is there any way to guesstimate how much memory this will need? Just trying to get a better feel of data frames and memory...
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How to read a text-file resource into Java unit test? [duplicate]
... needs to work with XML file located in src/test/resources/abc.xml . What is the easiest way just to get the content of the file into String ?
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Django Admin - change header 'Django administration' text
How does one change the 'Django administration' text in the django admin header?
18 Answers
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Insert an element at a specific index in a list and return the updated list
I have this:
5 Answers
5
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What does the arrow operator, '->', do in Java?
...plementation (right side).
The general syntax for using lambda expressions is
(Parameters) -> { Body } where the -> separates parameters and lambda expression body.
The parameters are enclosed in parentheses which is the same way as for methods and the lambda expression body is a block of code...
How exactly does a generator comprehension work?
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Do you understand list comprehensions? If so, a generator expression is like a list comprehension, but instead of finding all the items you're interested and packing them into list, it waits, and yields each item out of the expression, one by o...
Linux how to copy but not overwrite? [closed]
I want to cp a directory but I do not want to overwrite any existing files even it they are older than the copied files. And I want to do it completely noninteractive as this will be a part of a Crontab Bash script. Any ideas?
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