exist exists

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Determine if file exists, does not exist create file && determine if folder exists, does not exist create folder

1, determine whether the file exists, does not exist to create a file[Java]View Plaincopyprint? File file=new file ("c:\\users\\qping\\desktop\\javascript\\2.htm"); if (!file.exists ()) { try { File.createnewfile (); } catch

Php traverses the array to find whether the array element exists with the current string. if it does not exist, the current string is output. if it exists, the key value of the array is output.

{Code...} What I want to do is to traverse the array to find whether the array element exists with the current string. if it does not exist, the current string is output. if it exists, the key value of the array is output. Is the translation

"Reprint" A shell script to monitor whether a process exists or does not exist the instance started

Use the shell script to monitor if the process has an instance that does not exist, starting with code dry:#!/bin/shPs-fe|grep processstring |grep-v grepIf [$?-ne 0]Thenecho "START process ..."Elseecho "Runing ..."Fi#####Processstring represents a

MySQL insert when the record does not exist and update when the record exists

When the MySQL record does not exist, insert. When the record exists, there are basically three solutions to update the internet. First: Example 1: insert multiple records. Suppose There Is A client_id table with the primary key, you can use the

Determine whether an XML file exists. If it does not exist, create an XML file. If it exists, add it to it.

If (file. exists (xmlpath + "\" + xmlname) // checks whether the file is in the {// state. xmldocument xmldoc = new xmldocument (); xmldoc. load (xmlpath + "\" + xmlname); // The xmlnode root = xmldoc file exists. selectsinglenode ("History");

Oracle exists and not exist

Let's take a look at the following example: Two system tables in Oracle. emp, dept. example: 1: not exists (not in) Not exists: This statement returns the result set that the select * from scott. dept d where e. deptno = d. deptno and d. deptno = 10

C # Compares two list sets, two sets exist at the same time or a set exists in the B set without

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading;usingSystem.Threading.Tasks;namespacesample3{classProgram {Static voidMain (string[] args) { varStudent1 =NewList(); Student1. ADD

If mysql exists, it is updated. if mysql does not exist, it is inserted. how can this problem be written?

If mysql exists, it is updated. if it does not exist, it is inserted. how can I write it? if mysql exists, it is updated. if it does not exist, it is inserted, how can I write a table like friend_idcomment_num, which records comments on Friends?

Use shell script to monitor if a process exists that does not exist the instance that is started

Use shell script to monitor whether a process exists without a startup instance, first on the code dry: #!/bin/shPs-fe|grep processstring |grep-v grepIf [$?-ne 0]Thenecho "START process ..."Elseecho "Runing ..."Fi#####Processstring represents a

Insert when record does not exist and update method when record exists

MySQL inserts a record when the record does not exist. When the record exists, there are three solutions to update the online. Example 1: INSERT multiple records. Suppose There Is A client_id table with the primary key. You can use the following

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