conns con

Event_handler, the core part of which is drive_machine, which is consistent with the worker thread, and then puts the conn into the listening queue (conn *listen_conn). The conn of the client connection received on the listener will be placed in the connection queue Conn **conns. Finally, start the Libevent event loop in the main function. Or is the diagram intuitive, as follows:static int server_sockets (int port, enum Network_transport Transport,FI

need to filter out the results of the Connect row that contain the database name I defined. Of course, you need to format the SELECT statement.My awk script:Begin {Mydb = "default_database ";If (argc = 2 substr (argv [1], 0, 3) = "DB = "){Mydb = substr (argv [1], 4 );Printf ("My dB % s/n", mydb );}}/[0-9] * connect /{If (index ($0, mydb) = 0 ){# Printf ("not using % s/n", $0 );} Else {If ($2 = "Connect "){What = $1;} Else {What = $3;}Print;Conns [wh

connection pool for broadcast message Conns: = Make (map[string]net. Conn)//Message Channel Messagechan: = Make (Chan string, 10)//Broadcast message Go broadmessages (conns, Messagechan)//Start for {fmt. Printf ("Listening port%s ... \ n", port) conn, err: = Listener. ACCEPTTCP () if err! = Nil {log. Printf ("Accept failed:%v\n", err) continue}//throws each client connection into the connection pool

This article illustrates a simple chat room based on the websocket implementation of Golang. Share to everyone for your reference, specific as follows: First of all, it is irrelevant, recently busy work did not update the blog, today rest by the way Golang WebSocket studied a bit, quite fun, wrote a chat room, to share with you. WebSocket Bag: Code.google.com/p/go.net/websocket Documents: Http://go.pkgdoc.org/code.google.com/p/go.net/websocket First install the WebSocket package Copy C

The previous article describes the processing of the request, the first face LIGHTTPD will return the results of processing to the client. The state machine enters the Con_state_responst_start. In this state, the main work of the server is in the function Connection_handle_write_prepare. This function is not complex, mainly based on the client request method to set the response headers, in fact, is to set the value of "Content-length". Here is the function code, which makes some limitations:Stat

is the browser client, and what is non-browser client, the author of this study is not deep, just found in the development, in the go Web programming, because go itself can use template templates to push the page to the user, such as the user input 127.0.0.1 on the client : 9000, the server receives this request, will send the homepage of the website to the user (here assumes 127.0.0.1:9000/, this route corresponds to a homepage of GET request). The author thinks that the Web server program whi

connection pool for broadcast message Conns: = Make (map[string]net. Conn)//Message Channel Messagechan: = Make (Chan string, 10)//Broadcast message Go broadmessages (conns, Messagechan)//Start for {fmt. Printf ("Listening port%s ... \ n", port) conn, err: = Listener. ACCEPTTCP () if err! = Nil {log. Printf ("Accept failed:%v\n", err) continue}//throws each client connection into the connection pool

Most of the applications need to be supported by the database interaction, then the relative database access is very important, the most basic is through the way of ADO, there are some relative ORM framework, such as Ef,nhibernate, and so on, follow-up, the corresponding namespace corresponding to the import can beProvide a connection string or app. config in Web. configConfigure the connection string to be placed behind #region Several other ways to connectstatic string conner = @ "Data source=

= null;}Public static void close (ResultSet rs ){Try {If (rs! = Null ){Rs. close ();}} Catch (SQLException e ){E. printStackTrace ();}Rs = null;}Public static void closeAll (Connection conn, Statement stmt ){DB. close (conn );DB. close (stmt );}Public static void closeAll (Connection conn, Statement stmt, ResultSet rs ){DB. close (conn );DB. close (stmt );DB. close (rs );}} ConnPool. java [Java]Package wkx. db;Import java. SQL. Connection;Import java. SQL. DriverManager;Import java. SQL. SQLExc

is actually very troublesome, there is no need to be so troublesome. From the above functions, we can also see that the trouble is mainly on the busi pool. The free pool processing is actually quite simple, so we have the following design: The connection pool only stores idle connections, rather than the State of the saved connections. Instead, the status should be handed over to the management function. The following uses the connection pool as an example. I redesigned the connection pool stru

Memory information/meminfo Return dict #!/usr/bin/env pythondef memory_stat(): mem = {} f = open("/proc/meminfo") lines = f.readlines() f.close() for line in lines: if len(line) CPU information/cpuinfoReturns a list with a dict per core. #!/usr/bin/env pythondef cpu_stat(): cpu = [] cpuinfo = {} f = open("/proc/cpuinfo") lines = f.readlines() f.close() for line in lines: if line == '\n': cpu.append(cpuinfo) cpuinfo = {}

Java JDBC uses a configuration file to connect to the database:Create a file with a suffix named:. Properties, including, database driver, connected database address, user name, password ...Take MySQL as an example to create a config.properties configuration file whose contents are as follows:Driver_class=com.mysql.jdbc.driverConnection_url=jdbc:mysql://localhost:3306/testConnection_username=rootConnection_password=rootTo create a connection database class:For example:public class ConnectionFact

/config.php ';Class Db_adapter{Const MASTER = 0;Const SLAVE = 1;private static $instances = Array ();Private $conf = Array ();Private $conns = Array ();Private $conn = NULL;private $stmt = NULL;Public function __construct ($conf){$this->conf = $conf;}Public function Execute ($sql, $params){$cmd = substr (Strtolower (Trim ($sql)), 0, 6);if ($cmd = = ' select ') {$conn = $this->getconn (self::slave);} else {$conn = $this->getconn (self::master);}$conn->

Use threadlocal in service to complete transactions and lay the groundwork for future learning of spring transactions!1 transactions in DAOpublic void xxx () { Connection con = null; try { con = jdbcutils.getconnection (); Con.setautocommitted (false); Queryrunner qr = new Queryrunner (); String sql = ...; object[] params = ...; Qr.update (

Simulation and handling of ORA-8102 ProblemsSQL> SELECT NAME, TYPE # FROM OBJ $ WHERE OBJ # = 49;Name type #----------------------------------------I _CON2 1SQL> SELECT TABLE_NAME FROM DBA_INDEXES WHERE INDEX_NAME = 'I _ con2 ';TABLE_NAME------------------------------CON $Select owner #, NAME, CON # from con $ where name = '_ NEXT_CONSTRAINT ';SQL> SELECT OWNER #