Connecting to Oracle database using PHP_PHP tutorial

With PHP you can easily connect to the database, request data and display it on your web site, and even modify data in the database. MySQL is a very popular database, and there are many tutorials on PHP and MySQL on the Internet. MySQL is free, which may attract many people. Due to its wide application, I don't want to go into details about the use of MySQL here. Oracle is widely used in enterprise applications, so we will use Oracle to introduce the connection between PHP and database. We will certainly not mention the design principles of the Oracle database, as this is beyond the scope of our discussion.

PHP provides two sets of functions to connect to Oracle, namely ORA_ and OCI functions. The ORA_ function is slightly outdated. The OCI function update is said to be better. The usage syntax of the two is almost the same. Your PHP installation options should support the use of both.

Connection

< ? if ($conn=Ora_Logon("user@TNSNAME","password"))
{ echo "SUCCESS ! Connected to databasen";
}else
{echo "Failed :-( Could not connect to databasen";}
Ora_Logoff($conn);
phpinfo();
?>

above code Connect to the database using the Oracle database name, username and password defined by TNSNAME (specified in your tnsnames.ora file). On a successful connection, the ora_logon function returns a non-zero connection ID and stores it in the variable $conn.

Query

Assuming that the connection to the database is ready, let’s actually apply the query to the database.The following code demonstrates a typical example of connecting and querying:

function printoraerr($in_cur)
{
// Check if Oracle has an error
// Display if there is an error
//When the pointer is activated, this function is called after each request to Oracle
if(ora_errorcode($in_cur))
echo "Oracle code - ".ora_error($in_cur)."n";
return;
}
if (!($conn=ora_logon("user@TNSNAME","password")))
{echo "Connection to database failedn";
exit;
}
echo "Connected as connection - $conn n";
echo "Opening cursor ... n";
$cursor=ora_open($conn); printoraerr($cursor);
echo "Opened cursor - $cursor n";
$qry="select user,sysdate from dual";
echo "Parsing the query $qry ... n";
ora_parse($cursor,$qry ,0); printoraerr($cursor);
echo "Query parsed n";
echo "Executing cursor ... n";
ora_exec($cursor); printoraerr($cursor);
echo "Executed cursor n";
echo "Fetching cursor ... n";
while(ora_fetch($cursor))
{
$user=ora_getcolumn($cursor,0); printoraerr($cursor);
$sysdate=ora_getcolumn($cursor,1); printoraerr($cursor);
echo " row = $user, $sysdate n";
}
echo " Fetched all records n";
echo "Closing cursor ... n";
ora_close($cursor);
echo "Closed cursor n";
echo "Logging off from oracle... n";
ora_logoff($conn);
echo "Logged off from oracle n";
?>

Display results

The following code demonstrates how to query Database and output the result:

function printoraerr($in_cur, $conn)
{
// Check whether Oracle has an error
// If there is an error, it will be displayed
// When This function is called after each request to Oracle when the pointer is activated
// If it encountered an error, we exit immediately
if(ora_errorcode($in_cur))
{echo "Oracle code - ".ora_error( $in_cur)." n";
ora_logoff($conn);
exit;
}
return;
}

function exequery($w_qry,$conn)
{
$cursor=ora_open($conn); printoraerr($cursor,$conn);
ora_parse($cursor,$w_qry,0); printoraerr($cursor,$conn);
ora_exec($cursor); printoraerr($cursor,$conn);
$numrows=0;
$w_numcols=ora_numcols($cursor);
// Display header
echo " n ";
for ($i=0;$i<$w_numcols;$i++)
{
$align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT" :"LEFT";
echo "t ".ora_columnname($cursor,$i)." n";
}
echo " n";
while(ora_fetch($cursor))
{
echo " n";
for ($i=0;$i<$w_numcols;$i++)
{
$align=(ora_columntype($cursor,$i)= ="NUMBER")?"RIGHT":"LEFT";
if(ora_columntype($cursor,$i)=="LONG")
echo " ".
ora_getcolumn($cursor,$i) )." n";
else
echo " ".ora_getcolumn($cursor,$i)." n";
printoraerr($cursor,$conn);
}
$ numrows++;
echo " n";
}
if ($numrows==0) ​​
echo " Query returned no records n";
else
{
echo " n";
echo " Count n";
echo " $numrows n";
echo " n";
}
echo " n";
ora_close($cursor) ;
return;
}
// Main program
if(!($conn=ora_logon("user@SID","password")))
{
echo " Error: Cannot connect to databasen";
exit;
}
$qry="SELECT
deptno "Dept"
,empno "Emp"
,empnm "Name"
,salary "Salary"
FROM
employee
ORDER BY 1,2";
exequery($qry);
ora_logoff($conn);
?>


HTTP-based Oracle login

Add the following code before the PHP page code to confirm Oracle login. Note that you must set $SID correctly.

if(!isset($PHP_AUTH_USER))
{
Header("WWW-authenticate: basic realm="$SID"");
Header("HTTP/1.0 401 Unauthorized ");
$title="Login Instructions";
echo "
You are not authorized to enter the site
n";
exit;
}
else
{
if (!($conn=ora_logon("$PHP_AUTH_USER@$SID",$PHP_AUTH_PW)))
{Header("WWW-authenticate: basic realm="$SID"");
Header("HTTP/1.0 401 Unauthorized");
$title="Login Instructions";
echo "
You are not authorized to enter the site
n";
exit ;
}}
?>

http://www.bkjia.com/PHPjc/315259.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/315259.htmlTechArticleThrough PHP you can easily connect to the database, request data and display it in your web site, and even Modify data in the database. MySQL is a very popular database and is used on the Internet...