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Opens a connection to a Microsoft SQL Server database


sqlsrv_connect

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sqlsrv_connectOpens a connection to a Microsoft SQL Server database

Description

resource sqlsrv_connect ( string $serverName [, array $connectionInfo ] )

Opens a connection to a Microsoft SQL Server database. By default, the connection is attempted using Windows Authentication. To connect using SQL Server Authentication, include "UID" and "PWD" in the connection options array.

Parameters

serverName

The name of the server to which a connection is established. To connect to a specific instance, follow the server name with a forward slash and the instance name (e.g. serverName\sqlexpress).

connectionInfo

An associative array that specifies options for connecting to the server. If values for the UID and PWD keys are not specified, the connection will be attempted using Windows Authentication. For a complete list of supported keys, see » SQLSRV Connection Options.

Return Values

A connection resource. If a connection cannot be successfully opened, FALSE is returned.

Examples

Example #1 Connect using Windows Authentication.

<?php
$serverName 
"serverName\sqlexpress"//serverName\instanceName

// Since UID and PWD are not specified in the $connectionInfo array,
// The connection will be attempted using Windows Authentication.
$connectionInfo = array( "Database"=>"dbName");
$conn sqlsrv_connect$serverName$connectionInfo);

if( 
$conn ) {
     echo 
"Connection established.<br />";
}else{
     echo 
"Connection could not be established.<br />";
     die( 
print_rsqlsrv_errors(), true));
}
?>

Example #2 Connect by specifying a user name and password.

<?php
$serverName 
"serverName\sqlexpress"//serverName\instanceName
$connectionInfo = array( "Database"=>"dbName""UID"=>"userName""PWD"=>"password");
$conn sqlsrv_connect$serverName$connectionInfo);

if( 
$conn ) {
     echo 
"Connection established.<br />";
}else{
     echo 
"Connection could not be established.<br />";
     die( 
print_rsqlsrv_errors(), true));
}
?>

Example #3 Connect on a specifed port.

<?php
$serverName 
"serverName\sqlexpress, 1542"//serverName\instanceName, portNumber (default is 1433)
$connectionInfo = array( "Database"=>"dbName""UID"=>"userName""PWD"=>"password");
$conn sqlsrv_connect$serverName$connectionInfo);

if( 
$conn ) {
     echo 
"Connection established.<br />";
}else{
     echo 
"Connection could not be established.<br />";
     die( 
print_rsqlsrv_errors(), true));
}
?>

Notes

By default, the sqlsrv_connect() uses connection pooling to improve connection performance. To turn off connection pooling (i.e. force a new connection on each call), set the "ConnectionPooling" option in the $connectionOptions array to 0 (or FALSE). For more information, see » SQLSRV Connection Pooling.

The SQLSRV extension does not have a dedicated function for changing which database is connected to. The target database is specified in the $connectionOptions array that is passed to sqlsrv_connect. To change the database on an open connection, execute the following query "USE dbName" (e.g. sqlsrv_query($conn, "USE dbName")).

See Also

  • sqlsrv_close() - Closes an open connection and releases resourses associated with the connection
  • sqlsrv_errors() - Returns error and warning information about the last SQLSRV operation performed
  • sqlsrv_query() - Prepares and executes a query.



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