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What does the 'b' character do in front of a string literal?
... last):
File "<stdin>", line 1, in <module>
TypeError: can't concat bytes to str
The b'...' notation is somewhat confusing in that it allows the bytes 0x01-0x7F to be specified with ASCII characters instead of hex numbers.
>>> b'A' == b'\x41'
True
But I must emphasize, a cha...
Rails 4 LIKE query - ActiveRecord adds quotes
...xpose you to SQL-injection (which is bad). I would suggest you use the SQL CONCAT() function to prepare the string like so:
"name LIKE CONCAT('%',?,'%') OR postal_code LIKE CONCAT('%',?,'%')", search, search)
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Ant: How to execute a command for each file in directory?
...esource property="element" unless:blank="@{list}" >
<concat>@{list}</concat>
<filterchain>
<replaceregex pattern="([^;]*).*" replace="\1" />
</filterchain>
</loadresource>
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Detect if value is number in MySQL
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This should work in most cases.
SELECT * FROM myTable WHERE concat('',col1 * 1) = col1
It doesn't work for non-standard numbers like
1e4
1.2e5
123. (trailing decimal)
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How to create a MySQL hierarchical recursive query
...) initialisation
where find_in_set(parent_id, @pv)
and length(@pv := concat(@pv, ',', id))
Here is a fiddle.
Here, the value specified in @pv := '19' should be set to the id of the parent you want to select all the descendants of.
This will work also if a parent has multiple children. Howe...
Can I “multiply” a string (in C#)?
...
In .NET 4 you can do this:
String.Concat(Enumerable.Repeat("Hello", 4))
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Is there any haskell function to concatenate list with separator?
Is there a function to concatenate elements of a list with a separator?
For example:
5 Answers
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How to combine paths in Java?
...oes have a class FilenameUtils that can do this kind of thing, such as the concat() method.
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JavaScript variable number of arguments to function
...rty. This includes the arguments object. Knowing this, and that the method concat returns a copy of the 'array' it's called on, we can easily convert the arguments object to a real array like this: var args = [].concat.call(arguments). Some people prefer to use Array.prototype.concat.call instead, b...
Convert array of integers to comma-separated string
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I am using .NET 4.5. I tried to concat the comma separated numbers with a string. I got an error saying "cannot convert string[] to char". So the earlier version worked flawlessly.
– Prasanth G
Jan 30 at 12:49
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