wildcard

问题 No doubt this has been answered already :/ I'm not certain how to word this. I just want the file one.txt to return by what I thought would be dir *.txt Here are some examples to show that it doesn't behave like I had thought. dir *.txt one.txt one.txtf dir *txt one.txt one.txtf dir *txtf one.txtf dir *tx? one.txt one.txtf dir *.??? one.txt one.txtf dir one.??? one.txt dir *"."??? one.txt one.txtf 回答1: EDITED In short - by definition the DIR command works as you're implying so it's one of

问题 The offending code was: <console>:47: error: wrong number of parameters; expected = 2 terms.foldLeft(r.unitA)(r.add(_, _.eval(x))) I solved my problem by writing: terms.foldLeft(r.unitA)((a,b) => r.add(a, b.eval(x))) But I'd still like to know what prevented my initial attempt? 回答1: From what I've read on this type of issue, when you use "_" as a place holder for an anonymous parameter of a function, the scope of that function is the innermost parenthesis containing it. So when you wrapped

问题 I am attempting to create a script that checks for the existence of archived eventlog files and, if any files exist, moves them to another folder. Running this script does nothing and gives no errors. I believe the wildcard in the If statement is what is giving me issues. I am new to vbscript, and scripting in general, and would appreciate some advice. Set fso = CreateObject("Scripting.FileSystemObject") If (fso.FileExists("d:\eventlogs\Archive*.evtx")) Then FSO.CopyFile "d:\eventlogs\Archive

问题 I was not able to find any reference about syntax of the PowerShell -like operator. Windows PowerShell reference on comparison operators states only: -Like Description: Match using the wildcard character (*). Though by experimenting I've found that it also supports the ? and the [] (set). Is there any other syntax supported? Is there any definitive reference to the -like operator? 回答1: The help for about_Comparison_Operators indeed claims wildcard support. It fails to specify what, exactly, a

问题 In Java, the Collections class contains the following method: public static <T extends Object & Comparable<? super T>> T min(Collection<? extends T> c) Its signature is well-known for its advanced use of generics, so much that it is mentioned in the Java in a Nutshell book and in the official Sun Generics Tutorial. However, I could not find a convincing answer to the following question: Why is the formal parameter of type Collection<? extends T> , rather than Collection<T> ? What's the added

问题 tl;dr: To be able to use wildcards (globs) in the listed paths, one simply has to use globStatus(...) instead of listStatus(...). Context Files on my HDFS cluster are organized in partitions, with the date being the "root" partition. A simplified example of the files structure would look like this: /schemas_folder ├── date=20140101 │ ├── A-schema.avsc │ ├── B-schema.avsc ├── date=20140102 │ ├── A-schema.avsc │ ├── B-schema.avsc │ ├── C-schema.avsc └── date=20140103 ├── B-schema.avsc └── C

问题 Is there any way to select columns with wild cards. like to select columns with names having type could be ' SELECT %type% from table_name ' ? 回答1: Not really. You can use the * column wildcard to select all columns. If you're joining multiple tables, you can select all columns from specific table by prefixing * with the table name or alias: SELECT a.id, a.title, b.* FROM articles AS a JOIN blurbs AS b ON a.id = b.article However, you shouldn't use * unless you're writing a DB administration

问题 What is the difference in '%' and '%%', when used in mysql where clause with 'LIKE' ? select * from `wp_users` u where u.user_nicename like "%lastuser%" VS select * from `wp_users` u where u.user_nicename like "%%lastuser%%" 回答1: There is no difference between %% and % when it comes to pattern matching in mysql. I've seen developers get confused over this when they try to match a literal % and therefor write %% . This is most often because of the fact that format-strings often use a double %

问题 I have a method that returns a map defined as: public Map<String, ?> getData(); The actual implementation of this method is not clear to me, but, when I try to do: obj.getData().put("key","value") I get following compile time error message: The method put(String, capture#9-of ?) in the type Map is not applicable for the arguments (String, String) What is the problem? Is String not of type anything? Thanks in advance. 回答1: The wildcard means "the value type parameter could be anything" - it

问题 I have the following query to search patients by full name, for an specific medical center: MustJunction mj = qb.bool().must(qb.keyword() .onField("medicalCenter.id") .matching(medicalCenter.getId()) .createQuery()); for(String term: terms) if(!term.equals("")) mj.must(qb.keyword() .onField("fullName") .matching(term+"*") .createQuery()); And it is working perfectly, but only if the user types the full firstname and/or lastname of the patient. However I would like to make if work even if the