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How to execute a raw update sql with dynamic binding in rails
... f1=? where f2=? and f3=?")
st.execute(f1, f2, f3)
st.close
I'm not sure if there are other ramifications to doing this (connections left open, etc). I would trace the Rails code for a normal update to see what it's doing aside from the actual query.
Using prepared queries can save you a small am...
Django - how to create a file and save it to a model's FileField?
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In addition to this, I got an error if I don't specify the file mode while opening the file. So, f = open('/path/to/file', 'r') For ZIP kind of file, f = open('/path/to/file.zip', 'rb')
– rajagopalx
Dec 14 '17 at 19:43
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No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
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Set the JAVA_HOME environment variable to the JDK root folder - required if you run command line or maven (mvn).
(Search google for JAVA_HOME for more info)
In project properties in section Java Compiler select required JDK - if you run directly from eclipse
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Count how many records are in a CSV Python?
...akes for an efficient counter, avoiding storing the whole file in memory.
If you already read 2 rows to start with, then you need to add those 2 rows to your total; rows that have already been read are not being counted.
sh...
How to set default values in Rails?
...angerous word in Ruby. There's usually more than one way to do anything. If you know you'll always want that default value for that column on that table, setting them in a DB migration file is the easiest way:
class SetDefault < ActiveRecord::Migration
def self.up
change_column :people, ...
Editing legend (text) labels in ggplot
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@Sathish I bit late, but fixed the typo now :-)
– Jaap
Jun 4 '19 at 5:34
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MySQL vs MySQLi when using PHP [closed]
...QL Improved Extension Overview, it should tell you everything you need to know about the differences between the two.
The main useful features are:
an Object-oriented interface
support for prepared statements
support for multiple statements
support for transactions
enhanced debugging capabiliti...
Regex (grep) for multi-line search needed [duplicate]
...ine at the end of line, substituting it for null character. That is, grep knows where end of line is, but sees the input as one big line.
-o print only matching. Because we're using -z, the whole file is like a single big line, so if there is a match, the entire file would be printed; this way it w...
How to update npm
...nload/
For historical understanding: Chis Lea was maintaining his PPA but now joined forces with nodesource.
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How to fix a locale setting warning from Perl?
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Your OS doesn't know about en_US.UTF-8.
You didn't mention a specific platform, but I can reproduce your problem:
% uname -a
OSF1 hunter2 V5.1 2650 alpha
% perl -e exit
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LC_ALL = (unset),
L...