Check if a string is null or empty in XSLT 多条件查询 string.Format("/root/deviceList//item/guid[{0}]", strBuilder.ToString()) "/root/deviceList//item/guid[text()=\"h\" or text()=\"a\" or text()=\"c\"]"谓词嵌套var nodes = xmlDoc.SelectNodes(string.Format("/root/device...
Checking if a string is NULL or EMPTY is very common requirement in Powershell script. If we don’t do that we will end up with run time errors if we try to perform some operation on that string variable which is empty or null. So the question now is, how to check it? Well, belo...
Java String isEmpty() Java String trim() Example 1: Check if String is Empty or Null class Main { public static void main(String[] args) { // create null, empty, and regular strings String str1 = null; String str2 = ""; String str3 = " "; // check if str1 is null or emp...
check if object is $null Check if OS is 32bit or 64bit check If Process Is Running in another computer Check if SMB1 is enabled on the AD servers Check if string contains invalid characters Check if string starts with letter/character. check installed memory with physical memory Check networ...
Right now I have an error if f.ParentID is null:DataSet1.TreeItemRow[] TreeItemRows = (from f in tidt where (f.ParentID == TreeItemId) select f).ToArray();I must continue if f.ParentID is null, I don't want to include null fileds in the array. What is the right synta...
In continuation of this post (Check String is NULL or EMPTY), I managed to successfully write up the if and else logic. However, my third logic does not work. My third logic is something like checking both empty fields at the same time and if they are empty, the error icon would pop...
log("%o is bad", num); } }); /* * check if value is not empty-or-whitespace string */ [null, "", " ", "hello"].forEach(str => { if (str && /\S/.test(str)) { console.log("%o is truthy and has non-whitespace characters", str); } else { conso...
@overrideRotatableStringgetcurrent {if(_currentTextRun==null) {throwStateError('Current is undefined before moveNext is called or after last element.'); }return_currentTextRun!; } The ! operator is required even though_currentTextRuncan't possibly be null. ...
-n is one of the supported bash string comparison operators used for checking null strings in a bash script. When -n operator is used, it returns true for every case, but that’s if the string contains characters. On the other hand, if the string is empty, it won’t return true. ...
IF l_UserID IS NULL SELECT FirstName, LastName, EMail FROM Users WHERE UserID = l_UserID; END The problem is in how to acheive the same as IF UserID <> NULL in MYSQL? Thanks in advance? --- NC Subject Written By Posted