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When is CRC more appropriate to use than MD5/SHA1?
...
I found a study that shows how inappropriate CRC hashes are for hash tables. It also explains the actual characteristics of the algorithm. The study also includes evaluation of other hash algorithms and is a good reference to keep.
The relevant conclusion on CRC for hashes:
CRC32 was neve...
How do I pass JavaScript variables to PHP?
...; tags you can output something more human-friendly (like $row['name'], if table "salaried" have one)
}
?>
</select>
<?php endif ?>
</p>
<p>
<input type="submit" value="Sumbit my choice"/>
</p>
...
ManyRelatedManager object is not iterable
...}
{% empty %}
empty list!
{% endfor %}
UPDATE
If you have a through table, you can access the elements in that table (as detailed here) like so (note, you use the through table name, in lowercase, suffixing _set):
{% for roominfo in participant.roomchoicethru_set.all %}
{{ roominfo.room}} ...
Differences in auto-unboxing between Java 6 vs Java 7
...ve type by unboxing conversion (§5.1.8).
The Java 7 JLS also contains a table (table 5.1) of allowed conversions (this table is not included in the Java 5/6 JLS) from reference types to primitives. This explicitly lists casts from Object to primitives as a narrowing reference conversion with unbo...
Sync data between Android App and webserver [closed]
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For example, you want to sync table todoTable from MySql to Sqlite
First, create one column name version (type INT) in todoTable for both Sqlite and MySql
Second, create a table name database_version with one column name currentVersion(INT)
In MySql,...
Differences between Perl and PHP [closed]
...han @foo or %foo.
(related to the previous point) Perl has separate symbol table entries for scalars, arrays, hashes, code, file/directory handles and formats. Each has its own namespace.
Perl gives access to the symbol table, though manipulating it isn't for the faint of heart. In PHP, symbol table...
Is it safe to push_back an element from the same vector?
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@MatthieuM. No: Table 100 says: "pre: i and j are not iterators into a".
– Sebastian Redl
Sep 13 '13 at 14:34
2
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Subset of rows containing NA (missing) values in a chosen column of a data frame
...t "NA" strings to NA values, and let "NULL" strings as is).
If using read.table() or read.csv(), you should consider the "na.strings" argument to do clean data import, and always work with real R NA values.
An example, working in both cases "NULL" and "NA" cells :
DF <- read.csv("file.csv", na...
What is this: [Ljava.lang.Object;?
...[I@xxxxx
System.out.println(Arrays.toString(nums));
// [1, 2, 3]
int[][] table = {
{ 1, },
{ 2, 3, },
{ 4, 5, 6, },
};
System.out.println(Arrays.toString(table));
// [[I@xxxxx, [I@yyyyy, [I@zzzzz]
System.out.println(Arrays.deepToString(table));
// [[1], [2, 3], [4, 5, 6]]...
What is the difference between SQL, PL-SQL and T-SQL?
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Correction: SQL is a language to operate on tables for which SQL itself provides the definition. The SQL Standard avoids the words 'set' and 'relation' and their derivatives. SQL tables are not sets.
– onedaywhen
Nov 25 '11 at 12:...