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Quickly reading very large tables as dataframes
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# sqldf as on SO
f <- file("test.csv")
system.time(SQLf <- sqldf("select * from f", dbname = tempfile(), file.format = list(header = T, row.names = F)))
## user system elapsed
## 10.21 0.47 10.73
ff / ffdf
require(ff)
system.time(FFDF <- read.csv.ffdf(file="test.csv",nro...
Work on a remote project with Eclipse via SSH
...pective in Eclipse:
Define a new connection and choose SSH Only from the Select Remote System Type screen in the New Connection dialog.
Enter the connection information then choose Finish.
Connect to the new host. (Assumes SSH keys are already setup.)
Once connected, drill down into the host's Sft...
What's the difference between session.persist() and session.save() in Hibernate?
...st(entity);
session.getTransaction().commit();
session.close();
Result:
select nextval ('hibernate_sequence') // This is for vehicle Id generated : 36
insert into Employee_Vehicle ( Vehicle_Name, Vehicle_Id) values ( Honda, 36)
Note the result is same when you get an already persisted object an...
Why does find -exec mv {} ./target/ + not work?
... +
This variant of the -exec action runs the specified command on the selected files, but the command line is built by appending each selected file name at the end; the total number of invocations of the command will be much less than the number of matched files. The command line is built in...
Blocks and yields in Ruby
...y:
days = ["monday", "tuesday", "wednesday", "thursday", "friday"]
# select those which start with 't'
days.select do | item |
item.match /^t/
end
=> ["tuesday", "thursday"]
Or, we can also provide a custom sort algorithm, for instance based on the string size:
days.sort do |x,...
Two submit buttons in one form
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For i18n purposes it might be better to use the selected answer.
– Robin Green
Nov 29 '12 at 16:08
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When should std::move be used on a function return value? [duplicate]
...e object to be copied is designated by an lvalue, overload
resolution to select the constructor for the copy is first performed as
if the object were designated by an rvalue.
return foo; is a case of NRVO, so copy elision is permitted. foo is an lvalue. So the constructor selected for the "co...
Paused in debugger in chrome?
...caught exceptions" is active.
In your case, if you don't want to pause, select Don't pause on exceptions. To select, toggle the pause button till it become grey.
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How do you migrate an IIS 7 site to another server?
...ng the tool:
Right click your server or website in IIS Management Console, select 'Deploy', 'Export Application...' and run through the export.
On the new server, import the exported zip archive in the same way.
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Why does Hibernate require no argument constructor?
...please look at my problem How to write HQL JOIN query for multiple table's selected Columns using Constructor In The Select Clause
– Shantaram Tupe
Dec 9 '17 at 9:33
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