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The 'json' native gem requires installed build tools
...n to the problem at hand, you should be able to install JSON (or otherwise test that your DevKit successfully installed) by running the following commands which will perform an install of the JSON gem and then use it:
gem install json --platform=ruby
ruby -rubygems -e "require 'json'; puts JSON.loa...
JOIN queries vs multiple queries
...
Did a quick test selecting one row from a 50,000 row table and joining with one row from a 100,000 row table. Basically looked like:
$id = mt_rand(1, 50000);
$row = $db->fetchOne("SELECT * FROM table1 WHERE id = " . $id);
$row = $db-...
How to do joins in LINQ on multiple fields in single join
...y introducing the second join parameter. I do like the idea of ordering to test if I can get efficiency gains
– johnc
Dec 17 '08 at 12:55
...
Setting up maven dependency for SQL Server
...ndency>
Answer for the "old" Microsoft:
For my use-case (integration testing) it was sufficient to use a system scope for the JDBC driver's dependency as such:
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
&...
Return all enumerables with yield return at once; without looping through
...at exactly do you mean that it will call the methods immediately? I ran a test and it looks like it's deferring the method calls completely until something is actually iterated. Code here: pastebin.com/0kj5QtfD
– Steven Oxley
Aug 9 '10 at 23:20
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How can I write a heredoc to a file in Bash script?
..., use <<- (followed by a dash) to disable leading tabs (Note that to test this you will need to replace the leading whitespace with a tab character, since I cannot print actual tab characters here.)
#!/usr/bin/env bash
if true ; then
cat <<- EOF > /tmp/yourfilehere
The leadi...
How to use conditional breakpoint in Eclipse?
...
The latest Eclipse includes these options directly in the Breakpoints View as well.
– Michael Brewer-Davis
Aug 25 '11 at 17:58
...
URL to load resources from the classpath in Java
...tThread().getContextClassLoader(). I'll even give you my modifications and test classes.
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MySQL - Rows to Columns
...parameter before running it
SET SESSION group_concat_max_len = 1000000;
Test:
DROP TABLE IF EXISTS history;
CREATE TABLE history
(hostid INT,
itemname VARCHAR(5),
itemvalue INT);
INSERT INTO history VALUES(1,'A',10),(1,'B',3),(2,'A',9),
(2,'C',40),(2,'D',5),
(3,'A',14),(3,'B',67),(3,'D',8);
...
What is the meaning of #XXX in code comments?
...ed to as codetags. These codetags
may show up in application code, unit tests, scripts, general
documentation, or wherever suitable.
The PEP is an interesting read.
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