mysql_info

(PHP 4 >= 4.3.0, PHP 5)

mysql_info — Ottiene le informazioni relative alla query più recente.

Descrizione

string mysql_info ([ resource

$
        identificativo_connessione

] )

mysql_info() restituisce informazioni dettagliate relative all'ultima query usando lo specifico identificativo_connessione. Se identificativo_connessione non è specificato, viene considerata l'ultima connessione aperta.

mysql_info() restituisce una stringa per tutte le istruzioni elencate di seguito. Per tutte le altre restituisce FALSE. Il formato della stringa dipende dall'istruzione data.

Example #1 Istruzioni MySQL significative

INSERT INTO ... SELECT ...
String format: Records: 23 Duplicates: 0 Warnings: 0
INSERT INTO ... VALUES (...),(...),(...)...
String format: Records: 37 Duplicates: 0 Warnings: 0
LOAD DATA INFILE ...
String format: Records: 42 Deleted: 0 Skipped: 0 Warnings: 0
ALTER TABLE
String format: Records: 60 Duplicates: 0 Warnings: 0 
UPDATE
String format: Rows matched: 65 Changed: 65 Warnings: 0

I numeri sono indicati solo a titolo esemplificativo; i loro valori corrispondono alla query.

Nota:
mysql_info() restituisce un valore non FALSE per le istruzioni INSERT ... VALUES solo se nell'istruzione sono specificate liste di valori multipli.

Vedere anche: mysql_affected_rows()

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User Contributed Notes 5 notes

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eric at projectsatellite dot com ¶

14 years ago


I agree that this is a useful function to use when trying to check on whether an update query matched a particular row. I created a simple function that returns an associative array with the values delineated in the returned string.

function get_mysql_info($linkid = null){
    $linkid? $strInfo = mysql_info($linkid) : $strInfo = mysql_info();
    
    $return = array();
    ereg("Records: ([0-9]*)", $strInfo, $records);
    ereg("Duplicates: ([0-9]*)", $strInfo, $dupes);
    ereg("Warnings: ([0-9]*)", $strInfo, $warnings);
    ereg("Deleted: ([0-9]*)", $strInfo, $deleted);
    ereg("Skipped: ([0-9]*)", $strInfo, $skipped);
    ereg("Rows matched: ([0-9]*)", $strInfo, $rows_matched);
    ereg("Changed: ([0-9]*)", $strInfo, $changed);
    
    $return['records'] = $records[1];
    $return['duplicates'] = $dupes[1];
    $return['warnings'] = $warnings[1];
    $return['deleted'] = $deleted[1];
    $return['skipped'] = $skipped[1];
    $return['rows_matched'] = $rows_matched[1];
    $return['changed'] = $changed[1];
    
    return $return;
}

After trying to update a row that may or may not exist, you can use the above function like so:

$vals = get_mysql_info($linkid);
if($vals['rows_matched'] == 0){
     mysql_query("INSERT INTO table values('val1','val2', 'valetc')", $linkid);
}

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tomas at matfyz dot cz ¶

9 years ago


Please note that the information on warning count cannot be taken from the mysql_info() due to mysql bugs #41283 and #41285:

http://bugs.mysql.com/?id=41283
http://bugs.mysql.com/?id=41285

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info at granville dot nl ¶

12 years ago


Imade a quick conversion of eric's function just to count matched or affected rows from a query.

/**GD gdf_db_count_query_v1: returns the amount of rows matched or affected by the last query. Must be used immediately after the concerned query.
*/

function gdf_db_count_query($link = 'dbh') {
       
    $info_str = mysql_info($$link);

       if (ereg("Records: ([0-9]*)", $info_str, $count) == false) {
        ereg("Rows matched: ([0-9]*)", $info_str, $count);
    }
    
    return $count;

}

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bdobrica at gmail dot com ¶

12 years ago


As a solution to the problem pointed in the post reffering to mysql_affected_rows() returning 0 when you are making an update query and the fields are not modified although the query is valid, i'm posting the following function. It is very simple and based on a previous post.

function mysql_modified_rows () {
        $info_str = mysql_info();
        $a_rows = mysql_affected_rows();
        ereg("Rows matched: ([0-9]*)", $info_str, $r_matched);
        return ($a_rows < 1)?($r_matched[1]?$r_matched[1]:0):$a_rows;
        }

Hope you'll find it usefull.

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-7

carl at NOSPAMthep dot lu dot se ¶

15 years ago


This function can be used as a workaround for a misfeature of MySQL: on an UPDATE, rows that aren't updated _solely because they looked the same before_ will not be seen in mysql_affected_rows(). This causes problems when you want to use the result of the update to determine if there's need to do an INSERT. With MySQL you can do an INSERT IGNORE if there's no risk of if failing because of a duplicate key other than the one used in the UPDATE. However, if this isn't the case or you want a bit of RDBMS independence, there's no easy/pretty workaround. I think I'll resort to doing a SELECT to determine the primary key before doing the update/insert, as using the CVS version of PHP isn't an option for me.

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