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SQL error “ORA-01722: invalid number”
... to a number, and the spaces that delimit it are throwing this error. But based on the information you've given us, it could be happening on any field (other than the first one).
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deny direct access to a folder and file by htaccess
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This is pure mod_rewrite based solution:
RewriteRule ^(includes/|submit\.php) - [F,L,NC]
This will show forbidden error to use if URI contains either /includes/ or /submit.php
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OSGi, Java Modularity and Jigsaw
...ou cannot simply sprinkle modularity on top of an existing non-modular codebase. Making a non-modular codebase into a modular one inevitably requires some refactoring: moving classes into the correct package, replacing direct instantiation with the use of decoupled services, and so on.
This makes i...
How to change the default charset of a MySQL table?
...t to apply this change for all tables that are not encoded in ut8 in a database, you can use this query and execute the resulted queries : SELECT concat('alter table ', table_name, ' CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;') FROM information_schema.tables WHERE table_schema='<yo...
Access to the path is denied
...e me too! In my case I should add that I am annoyed that an HttpPostedFileBase object's SaveAs method required a name in addition to the path, considering the name is another property on the object. Of course I guess you could give it a different name this way.
– Ralph
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Compiling problems: cannot find crt1.o
... to know which architecture you're building for. Are you building an AMD64 based application? If so, you'll need to tell 'ld' where the AMD64 based shared object files are, i.e. the .o files you need. If you're working on an AMD64 they should be in /usr/lib64
– jeremiah
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python pandas: Remove duplicates by columns A, keeping the row with the highest value in column B
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Simplest solution:
To drop duplicates based on one column:
df = df.drop_duplicates('column_name', keep='last')
To drop duplicates based on multiple columns:
df = df.drop_duplicates(['col_name1','col_name2','col_name3'], keep='last')
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Display filename before matching line
... search.
-n, --line-number
Prefix each line of output with the 1-based line number within its
input file. (-n is
specified by POSIX.)
-H is a GNU extension, but -n is specified by POSIX
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How many threads is too many?
...he request is received. I do this because almost every request makes a database query. I am using a threadpool library to cut down on construction/destruction of threads.
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What is “2's Complement”?
... 22 + 1 × 21 + 1 × 20and if you work it out, that turns out to equal 15 (base 10). That's because it is 8+4+2+1 = 15.
This is all well and good for positive numbers. It even works for negative numbers if you're willing to just stick a minus sign in front of them, as humans do with decimal nu...