null
How to know if a PHP variable exists, even if its value is NULL?
$a = NULL; $c = 1; var_dump(isset($a)); // bool(false) var_dump(isset($b)); // bool(false) var_dump(isset($c)); // bool(true)[详细]
2023-04-10 22:55 分类：问答How to check for Is Not Null in VBA?
Hi I have the following expression. I\'m trying to say \"if the second field Is Not 开发者_如何学PythonNull\". Can you help.[详细]
2023-04-10 12:46 分类：问答Null Exception - don't know why
well i don\'t understand why i\'m getting a Null Exception in my code: public View getView(int position, View convertView, ViewGroup parent) {[详细]
2023-04-10 10:26 分类：问答How do I get SUM function in MySQL to return '0' if no values are found?
Say I have a simple function in MySQL: SELECT SUM(Column_1) FROM Table WHERE Column_2 = \'Test\' If no entries in Column_2 contain the text \'Test\' then this function returns NULL, while I would l[详细]
2023-04-10 02:17 分类：问答Java null char in string
I\'m trying to build a string in Java which will be at maximum 3 long and at minimum 1 long. I\'m building the string depending on the contents of a integer array and want to output a null character[详细]
2023-04-09 20:32 分类：问答Easier way of writing null or empty?
开发者_Go百科I\'m sure I\'ve missed something here. With a certain project I need to check if a string is empty or null.[详细]
2023-04-09 18:37 分类：问答Null Processing in MS SQL Server 2008
I’m not a SQL DBA and I’m having an issue.We run MS SQL 2008 server and just upgraded it from MS SQL 2000.I’m trying to run a query created for the DB in MS SQL 2000 and use the results for our mai[详细]
2023-04-09 16:04 分类：问答How to catch the exception caused by an absence of an object in Java?
I have a very simp开发者_Go百科le method: public int getScore() { return game.gameWindow.userBestScore;[详细]
2023-04-09 07:57 分类：问答Binary Zero, NULL Byte and ASCII [closed]
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical andcannot be reasonably answered in its current for开发者_运维技巧m.[详细]
2023-04-09 07:32 分类：问答Cannot get context to launch intent
I\'ve made a separate class to launch and intent as the class I would like to launch the intent from is a thread and does not inherit from activity and would not launch startActivity. Every time I lau[详细]
2023-04-09 03:30 分类：问答
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