connection

问题 I have looked around, but can't seem to find the answer to my question. Here is the context : I have to connect to a Database in my Java program and execute a SQL request that I have no control over and don't know in advance. To do that I use the code below. public Collection<HashMap<String, String>> runQuery(String request, int maxRows) { List<HashMap<String, String>> resultList = new ArrayList<>(); DataSource datasource = null; try { Context initContext = new InitialContext(); datasource =

问题 I'm using Socket.io to communicate between my Node.js server and the client website. Everything works great! Except one thing. I'm allowing the user to disconnect from Socket.io and reconnect later, or at least I'm trying to. Keeping in mind that my socket from calling io() is stored in mySocket, disconnecting works fine using mySocket.io.disconnect() . The server catches it, the client knows it's disconnected, it's great. The issue is when I try to reconnect later... So at first I just tried

问题 i've been trying to query a moodle database and need to use DB::raw(). but it keeps trying to use the default mysql connection. here's the query i'd like to run. SELECT mdl_course.id, mdl_course.category, mdl_course.fullname, mdl_course_categories.name, mdl_enrol.cost, FROM_UNIXTIME(mdl_course.startdate, '%m/%d/%y') AS startdate FROM mdl_course LEFT JOIN mdl_course_categories ON mdl_course_categories.id = mdl_course.category LEFT JOIN mdl_enrol ON mdl_enrol.courseid = mdl_course.id AND mdl

问题 i've been trying to query a moodle database and need to use DB::raw(). but it keeps trying to use the default mysql connection. here's the query i'd like to run. SELECT mdl_course.id, mdl_course.category, mdl_course.fullname, mdl_course_categories.name, mdl_enrol.cost, FROM_UNIXTIME(mdl_course.startdate, '%m/%d/%y') AS startdate FROM mdl_course LEFT JOIN mdl_course_categories ON mdl_course_categories.id = mdl_course.category LEFT JOIN mdl_enrol ON mdl_enrol.courseid = mdl_course.id AND mdl

问题 I'm working for weeks to try to solve this problem. I need to manage a connection between PHP and Microsoft Access Database .mdb. My goal is to create a web page that contain a table with the fields of a database table. But my table has about 30 columns, I would like to insert only 6 of these. Example: Database name: DinamicoWeb Table name: Orders Fields name: Id Ord, Ord Date, Name, Surname, Price, Total This is the code that I managed to write(put inside ALL columns). config.php <?php

问题 Sheesh talk about limited information! I'm trying to get my Android application to connect to an online database to access information. There's quite a bit of info including geotags and these are going to be mapped on my app. The developer site has the very informative piece of information: You can use the network (when it's available) to store and retrieve data on your own web-based services. To do network operations, use classes in the following packages: java.net.* android.net.* Like I

问题 With regards to handling a TCP/IP connection using the TcpClient class, is there an alternative for checking whether the remote host has closed the connection other than waiting for the NetworkStream.Read method to return a 0? 回答1: You can use IOControlCode.KeepAliveValues on the TcpClient.Client to guarantee that a keep-alive check is made at least on the specified interval and then check the TcpClient.Client.Connected property. An example how to use it: struct tcp_keepalive { public int

问题 With regards to handling a TCP/IP connection using the TcpClient class, is there an alternative for checking whether the remote host has closed the connection other than waiting for the NetworkStream.Read method to return a 0? 回答1: You can use IOControlCode.KeepAliveValues on the TcpClient.Client to guarantee that a keep-alive check is made at least on the specified interval and then check the TcpClient.Client.Connected property. An example how to use it: struct tcp_keepalive { public int

问题 I have a PHP script that keeps stopping at the same place every time and my browser reports: The connection to the server was reset while the page was loading. I have tested this on Firefox and IE, same thing happens. So, I am guessing this is an Apache/PHP config problem. Here are few things I have set. PHP.ini max_execution_time = 300000 max_input_time = 300000 memory_limit = 256M Apache (httpd.conf) Timeout 300000 KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 0 Are the above

问题 I'm using rabbitmq/rabbitmq-objc-client. Is there a way how to check if connection was opened successfully? I see there is RMQConnectionDelegate but there are only methods that are called when an error appears. I'm looking for something like RMQConnection *conn = [[RMQConnection alloc] /*...*/]; if ([conn isOpen]) { /* ... */ } 回答1: You can do this: [conn start:^{ // code to execute when connection established }]; But note that the client is async and all channel operations are placed onto a