database-connection

问题 I am developing NodeJS + MySQL web API. I am using mysql npm module. I want know connection is release or not is there any function or variable. Like if(!connection.isRelease() OR !connection.isClose() OR !connection.end()) { connection.release(); } Is there any specific function to know connection is release or not? I am getting error like "connection already release" 回答1: You can check if the connection is in the pool to see if it was released. The index in the free connections will be -1

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 days ago . I created two apps with Symfony. For these 2 apps, I can't connect to the databases with the same symptoms (timed out connection). Information common to both apps Host : OVH subscription : gold created in octobre 2016 Datacenter : Gravelines 1 Version php 7.1 (but same in 7.2, I

问题 i'm newbie,i want change my DB data from jquery-ui dialog. What code should I add to the dialog script that can make me connecting to process page before connecting to DB? 回答1: In your jquery-ui dialog you should have let say a button, and when you press it, it would update a row in a database table. In order to do it: -Create a button, and when pressed it would trigger an ajax request to a php file: $('#MyButton').click(function() { $.ajax({ type: "GET", url: "MyPage.php", data: "id=3",

问题 If connecting to a database consumes a lot of resources, why should a database connection always be closed in your application if you have to open it again? Can I just make this connection available globally throughout my application so that other classes and methods can reuse it? For example (in pseudo code): public class PopulateGridViews() { public SqlConnection conn = new SqlConnection(@"Database:DATABASE"); conn.Open(); void PopulateGrid1() { SqlCommand cmd = new SqlCommand("SELECT *

问题 I'm trying to connect java project to my mongodb database. But I keep recieving this error although I imported the mongodb driver to the project: Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/internal/connection/ServerAddressHelper and that's my connection code: MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://localhost:27017")); MongoDatabase database = mongoClient.getDatabase("Etudiant"); MongoCollection collection = database.getCollection(

问题 Is it possible to make ODBC connection without system-wide driver installed? Can I just point a DLL that contains the driver? I use it in C++, 32bit, currently testing on Windows, and connect to the Firebird Database. I tried following connection string, that doesn't work : constexpr auto DatabaseConnection = //"DRIVER=Firebird/InterBase(r) driver;" //this works when driver installed "UID=SYSDBA;" "PWD=masterkey;" "DBNAME=C:\\some\\path\\to\\database\\DB.FDB;" "Client=C:\\Windows\\System32\

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 days ago . I have two android devices suppose "A" and "B". "A" host SQLite database or in another words, database is located at "A". Now my question is, Is it possible to access database hosted by device "A" from device "B"?(Using Socket or anything else but Without use of internet, router

问题 I have MySQL installed on a Windows 2003 server on our domain. I cannot connect to it from other machines on the domain. I open up the MySQL Administrator panel and try to change the server name from localhost to the machine name it does not recognize it. I have tried fully qualifying the name also. Any ideas what I need to change? 回答1: What sort of error, a total inability to connect? Windows Firewall is the first place I'd look, to make sure port 3306 is open. 回答2: have you double checked

问题 I created a database in MAMP called "project". In my .env file I added this line: DATABASE_URL=mysql://root:root@localhost:3306/project Now I want to run php bin/console doctrine:database:create But I get an error message: SQLSTATE[HY000] [2002] No such file or directory my doctrine configurations: parameters: # Adds a fallback DATABASE_URL if the env var is not set. # This allows you to run cache:warmup even if your # environment variables are not available yet. # You should not need to

问题 I'm using HikariCP 2.4.7 for connection pool. Everything is fine just after starting the application but after some time without invoking getConnection() I get this error when I'm trying to getConnection() : java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 42734ms. at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:555) at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:188) at com.zaxxer