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Calling SQL Server more than one at same time and same connection


Calling SQL Server more than one at same time and same connection

By : user2952491
Date : November 19 2020, 01:01 AM
Hope that helps The generally accepted Best Practice for dealing with connections and commands on a "raw" ADO.NET level is to always create those objects as needed, as late as possible, and free them again as soon as possible. ADO.NET already has a very sophisticated connection pooling mechanism built-in - no point in trying to outsmart that well-proven mechanism.
In order to ensure proper disposal of the objects, it is also generally accepted to put them into using(...) { ... } blocks - something like this:
code :
// define query as a string
string query = "SELECT ..... FROM ... WHERE ......";

// create connection and command in "using" blocks
using (SqlConnection conn = new SqlConnection(-your-connection-string-here-))
using (SqlCommand cmd = new SqlCommand(conn, query))
{
    // set up e.g. parameters for your SqlCommand

    // open the connection, execute the query, close the connnection again
    conn.Open();

    // for a SELECT, use ExecuteReader and handle the reader (or use SqlDataAdapter to fill a DataTable)
    // for UPDATE, INSERT, DELETE just use a ExecuteNonQuery() to run the command
    using (SqlDataReader rdr = cmd.ExecuteReader())
    {
        while (rdr.Read())
        {
           // handle the data from the reader
        }

        // close reader
        rdr.Close();
    }

    conn.Close();
}


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2nd time calling PreparedStatement is not working after closing connection

2nd time calling PreparedStatement is not working after closing connection


By : user3535290
Date : March 29 2020, 07:55 AM
wish helps you PreparedStatement instances are tied to the connection used to prepare them, as far as I'm aware. You can't use the PreparedStatement after closing the connection, even if you open another one later.
how can i check if there is a connection internet connection by calling a gif from a server?

how can i check if there is a connection internet connection by calling a gif from a server?


By : Gautham Sharma
Date : March 29 2020, 07:55 AM
Hope that helps There are other ways to check for internet access with cordova/phonegap using plugins, but if you want to check if an image is available or not, then you can always check its size in the cache.
Either of these solutions should steer you forward:
Error on calling a function with connection to SQL server

Error on calling a function with connection to SQL server


By : Rovshan Arn
Date : November 01 2020, 03:01 PM
hop of those help? This would be better encapsulated without the global $pdo; part. Instead return the PDO object from your connect method, and pass it to the others, to be used.
N.B. I've deliberately given the variables different names in different places, to illustrate that the name doesn't have to be the same when it's passed from one scope to another, it's the object that's passed which is important. You might perhaps consider using consistent names though, to make it easier to comprehend the code later, and trace the object through the flow.
code :
<?php
$dbConn = dbConnect();
callQuery1($dbConn);
callQuery2($dbConn);

function callQuery1($db){
    // SQL query
    $q = "SELECT * FROM table1 WHERE name like 'john%' ";

    // Execute query
    $data1 = exeQuery($q, $db);
}

function callQuery2($db){
    // SQL query
    $q = "SELECT * FROM table2 WHERE event = 'holiday' ";

    // Execute query
    $data2 = exeQuery($q, $db);
}

// Execute SQL Query
function exeQuery($qry, $pdo) {

####### LINE 27 #######
    $stmt = $pdo->query($qry);

    if($stmt = $pdo->prepare($qry)) {
        $stmt->execute();
        $data = $stmt->fetchAll(PDO::FETCH_ASSOC);
        $stmt->closeCursor();       
        return $data;
    }
}

// database connection
function dbConnect(){

    $DBSERVER = "***";
    $DBUSER   = "***";
    $DBPASS   = "***";
    $DBNAME   = "***";

    // OBDC
    try {       
        $pdo = new PDO("odbc:DRIVER={SQL Server};Server={$DBSERVER};Database={$DBNAME}", $DBUSER, $DBPASS);
        // set the PDO error mode to exception
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        return $pdo;
    }
    catch(PDOException $ex) {
        //die(json_decode(array('outcome' => false, 'message' => 'Unable to connect')));
    }       
}
?>
When is physically a BLE connection is establishing? by calling establish connection() ? or calling the first characteri

When is physically a BLE connection is establishing? by calling establish connection() ? or calling the first characteri


By : praveen
Date : March 29 2020, 07:55 AM
it fixes the issue There are several ways to find out when the exact moment of connection happens. This may be done on several levels:
Android default logs
code :
Context context = /* your Context */;
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED);
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        final BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        Log.d("Connected", "BluetoothDevice[macAddress=" + bluetoothDevice.getAddress() + ']');
    }
};
context.registerReceiver(broadcastReceiver, intentFilter);
Given one established tcp connection from client to server, is a second one resolved without server explicitly calling a

Given one established tcp connection from client to server, is a second one resolved without server explicitly calling a


By : Deepika
Date : March 29 2020, 07:55 AM
This might help you Every connect() needs a corresponding accept() in order for client and server to communicate with each other.
However, it is possible/likely that the 3-way TCP handshake maybe/is completed while the connection is still in the server's backlog, before accept() creates a new socket for it. Once the handshake is complete, the connection is "established", and that will complete the connect() operation on the client's side, even if the connection has not been accept()ed yet on the server side.
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