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Postgres unique constraint vs index
... master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key value violates unique constraint "master_con_id_key"
DETAIL: Key (con_id)=(0) already exists.
test=# insert into master values (1, 0);
ERROR: duplicate key value violates unique constraint "master_uniq...
Ruby 'require' error: cannot load such file
I've one file, main.rb with the following content:
13 Answers
13
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Writing outputs to log file and console
... running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc ) which redirects all the outputs ( echo messages ) and errors to the log file from the executed script using the following code:
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Difference between 'struct' and 'typedef struct' in C++?
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If you just said:
struct Foo { ... };
Foo x;
you would get a compiler error, because Foo is only defined in the tag namespace.
You'd have to declare it as:
struct Foo x;
Any time you want to refer to a Foo, you'd always have to call it a struct Foo. This gets annoying fast, so you can add...
JUnit: how to avoid “no runnable methods” in test utils classes
... run successfully but test utility classes fail with "No runnable methods" error. The pattern I am using is to include all classes with name *Test* under test folder.
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Most useful NLog configurations [closed]
...bug" writeTo="f1" />
<logger name="Name.Space.Class1" levels="Debug,Error" writeTo="f1" />
<logger name="Name.Space.*" writeTo="f3,f4" />
<logger name="Name.Space.*" minlevel="Debug" maxlevel="Error" final="true" />
See the NLog help for more info on exactly what each of th...
CKEditor instance already exists
...elow is not a good solution as it is an internal API that can also produce errors, it is always better to use instance.destroy(true)
– Bala Clark
May 14 '12 at 12:43
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An example of how to use getopts in bash
...f expected arguments,
h - check for option -h without parameters; gives error on unsupported options;
h: - check for option -h with parameter; gives errors on unsupported options;
abc - check for options -a, -b, -c; gives errors on unsupported options;
:abc - check for options -a, -b, -c; silence...
How do you force Visual Studio to regenerate the .designer files for aspx/ascx files?
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Just wanted to say that I was having the same error and tried everything on this page, with nothing working. Turned out I was missing a ">" close tag on a div that had runat="server". Running VS-2008.
– Ber53rker
May 16 '12 at 14...
Eclipse - no Java (JRE) / (JDK) … no virtual machine
...ter - I have run it before with no problems, but now I keep getting this error:
34 Answers
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