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typecast string to integer - Postgres
...ur value is an empty string, you can use NULLIF to replace it for a NULL:
SELECT
NULLIF(your_value, '')::int
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Can I protect against SQL injection by escaping single-quote and surrounding user input with single-
...aping quote will be trimmed (in the 21st character). Then the SQL
sSQL = "select * from USERS where username = '" + username + "' and password = '" + password + "'"
combined with the aforementioned malformed username will result in the password already being outside the quotes, and will just con...
How to change package name of Android Project in Eclipse?
...can rename or change the package name, and also by right-clicking and then select Rename option, you can change or rename the package name.
When you press F2, it will show you the dialog box as:
In this dialog, don't forget to check the "Update references" checkbox because by making "check" to t...
What is size_t in C?
...array index.
Depending on the implementation, it can be any of:
unsigned char
unsigned short
unsigned int
unsigned long
unsigned long long
Here's how size_t is defined in stddef.h of my machine:
typedef unsigned long size_t;
...
How to use index in select statement?
...
If you want to test the index to see if it works, here is the syntax:
SELECT *
FROM Table WITH(INDEX(Index_Name))
The WITH statement will force the index to be used.
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LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method ca
... where p.Serial == strItem
select p;
The problem arises because ToString() isn't really executed, it is turned into a MethodGroup and then parsed and translated to SQL. Since there is no ToString() equivalent, the expression fails.
Note:
Make sure ...
E11000 duplicate key error index in mongodb mongoose
...find the index that you are not using anymore (in OP's case 'email'). Then select Drop Index
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Enabling auto layout in iOS 6 while remaining backwards compatible with iOS 5
...tolayout can be enabled or disabled on each .storyboard or .xib file. Just select the particular file and modify the "Use Autolayout" property using the File inspector in Xcode:
Using autolayout enabled interface files with the deployment target set to an iOS version prior to 6.0 results in compi...
CSS Child vs Descendant selectors
I am a bit confused between these 2 selectors.
8 Answers
8
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How dangerous is it to compare floating point values?
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[The 'right answer' glosses over selecting K. Selecting K ends up being just as ad-hoc as selecting VISIBLE_SHIFT but selecting K is less obvious because unlike VISIBLE_SHIFT it is not grounded on any display property. Thus pick your poison - select K or s...