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Can I grep only the first n lines of a file?
...s -l option? I'd like to list all the files who's first 5 characters are RIFFD.
– James M. Lay
May 23 '17 at 19:20
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When I catch an exception, how do I get the type, file, and line number?
...ould be careful about unpacking sys.exc_info() into local variables, since if you get an exception in the except handler, the local vars could get kept in a circular reference and not GC'd. Best practice is to always just use slices off of sys.exc_info() instead. Or use other modules like tracebac...
Hibernate throws org.hibernate.AnnotationException: No identifier specified for entity: com..domain.
...Id. Each @Entity needs an @Id - this is the primary key in the database.
If you don't want your entity to be persisted in a separate table, but rather be a part of other entities, you can use @Embeddable instead of @Entity.
If you want simply a data transfer object to hold some data from the hibe...
How to check if a word is an English word with Python?
I want to check in a Python program if a word is in the English dictionary.
9 Answers
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How to debug PDO database queries?
...fore moving to PDO, I created SQL queries in PHP by concatenating strings. If I got database syntax error, I could just echo the final SQL query string, try it myself on the database, and tweak it until I fixed the error, then put that back into the code.
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In JPA 2, using a CriteriaQuery, how to count results
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@Barett if it's a rather large count you probably don't want to load a list of hundreds or thousands of entities into memory just to find out how many there are!
– Affe
Dec 10 '12 at 6:31
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How to send an object from one Android Activity to another using Intents?
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If you're just passing objects around then Parcelable was designed for this. It requires a little more effort to use than using Java's native serialization, but it's way faster (and I mean way, WAY faster).
From the docs, a ...
How do I vertically align something inside a span tag?
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if your text wraps try my answer @NorbertoYoan
– Hashbrown
Oct 1 '13 at 2:18
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How to convert std::string to LPCWSTR in C++ (Unicode)
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If you use std::vector<wchar_t> to create storage for buf, then if anything throws an exception your temporary buffer will be freed.
– Jason Harrison
Jan 6 '10 at 19:01
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How to send a stacktrace to log4j?
...tion and get the following on the standard output (like, say, the console) if you do a e.printStackTrace() :
11 Answers
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