pg_query

A quick note for novice users: when gathering input from fields on a web form that maintains a database connection, *never* use pg_query to do queries from the field. Always sanitize input using pg_prepare and pg_execute.

It would be better this way:<?php  $result=pg_query($conn, "SELECT COUNT(*) AS rows FROM x WHERE a=b;");  if  (!$result) {   echo "query did not execute";  }  if ($line = pg_fetch_assoc($result)) {    if ($line['rows'] == 0) {     echo "0 records"    }  }  else {   while ($row = pg_fetch_array($result)) {     //do stuff with $row   }  }?> This solution doesn't raise the load of the system with the move of matching rows (perhaps 0,1, perhaps 100, 1000, ... rows)

expanding on the note left by "cmoore" -To check to see if the recordset returned no records,<?php  $result=pg_query($conn, "SELECT * FROM x WHERE a=b;");  if  (!$result) {    echo "query did not execute";  }  $rs = pg_fetch_assoc($result);  if (!$rs) {    echo "0 records"  }?>-jack

$GLOBALS["PG_CONNECT"]=pg_connect(...);....function query ($sqlQuery,$var=0) {   if (!$GLOBALS["PG_CONNECT"]) return 0;   $lev=error_reporting (8); //NO WARRING!!   $result=pg_query ($sqlQuery);   error_reporting ($lev); //DEFAULT!!   if (strlen ($r=pg_last_error ($GLOBALS["PG_CONNECT"]))) {      if ($var) {        echo "<p color=\"red\">ERROR:<pre>";        echo $sqlQuery;        echo "</pre>";        echo $r;        echo "&lt/p>";      }      close_db ();      return 0;   }   return $result;}

One thing to note that wasn't obvious to me at first.  If your query returns zero rows, that is not a "failed" query.  So the following is wrong:  $result=pg_query($conn, "SELECT * FROM x WHERE a=b;");  if  (!$result) {    echo "No a=b in x\n";  }pg_query returns FALSE if the query can not be executed for some reason.  If the query is executed but returns zero rows then you get back a resul with no rows.

There was a typo in the code that I posted:<?php  $result=pg_query($conn, "SELECT * FROM x WHERE a=b;");  if  (!$result) {   echo "query did not execute";  }  if (pg_num_rows($result) == 0) {   echo "0 records"  }  else {   while ($row = pg_fetch_array($result)) {     //do stuff with $row   }  }?>

Use pg_query to call your stored procedures, and use pg_fetch_result when getting a value (like a smallint as in this example) returned by your stored procedure.<?php$pgConnection = pg_connect("dbname=users user=me");$userNameToCheckFor = "metal";$result = pg_query($pgConnection, "SELECT howManyUsersHaveThisName('$userNameToCheckFor')");$count = pg_fetch_result($result, 0, 'howManyUsersHaveThisName');?>

Improving upon what jsuzuki said:It's probably better to use pg_num_rows() to see if no rows were returned, as that leaves the resultset cursor pointed to the first row so you can use it in a loop.Example:<?php  $result=pg_query($conn, "SELECT * FROM x WHERE a=b;");  if  (!$result) {   echo "query did not execute";  }  if (pg_num_rows($result) == 0) {   echo "0 records"  }  else {    while ($row = pg_fetch_array($result) {      //do stuff with $row    }  }?>I, personally, also find it more readable.

Here is my small function to make it easier for me to use data from select queries (attention, it is sensitive to sql injection)<?phpfunction requestToDB($connection,$request){     if(!$result=pg_query($connection,$request)){        return False;    }    $combined=array();    while ($row = pg_fetch_assoc($result)) {        $combined[]=$row;    }    return $combined;}?>Example:<?php$conn = pg_pconnect("dbname=mydatabase");$results=requestToDB($connect,"select * from mytable");//You can now access a "cell" of your table like this:$rownumber=0;$columname="mycolumn";$mycell=$results[$rownumber][$columname];var_dump($mycell);