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    mysql_info

    (PHP 4 >= 4.3.0, PHP 5)

    mysql_info — Get information about the most recent query

    Avviso

    Questa enstensione deprecata da PHP 5.5.0, e sarà rimossa in futuro. Al suo posto, usare l'estensione MySQLi o PDO_MySQL. Vedere anche la guida MySQL: scelta dell'API e le FAQ relative per ulteriori informazioni. Le alternative a questa funzione includono:

    Descrizione

    mysql_info(resource $link_identifier = NULL): string

    Returns detailed information about the last query.

    Elenco dei parametri

    link_identifier

    La connessione MySQL. Se l'identificativo di connessione non è specificato, l'ultima connessione aperta da mysql_connect() viene assunta. Se questa connessione non è trovata, si cercherà di crearne una come se mysql_connect() fosse stata chiamata senza argomenti. Se una connessione non è trovata oppure non viene stabilita, un avviso di livello E_WARNING viene generato.

    Valori restituiti

    Returns information about the statement on success, or false on failure. See the example below for which statements provide information, and what the returned value may look like. Statements that are not listed will return false.

    Esempi

    Example #1 Relevant MySQL Statements

    Statements that return string values. The numbers are only for illustrating purpose; their values will correspond to the query. 

    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

    Note

    Nota:

    mysql_info() returns a non-false value for the INSERT ... VALUES statement only if multiple value lists are specified in the statement.

    Vedere anche:

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    User Contributed Notes 5 notes

    up
    7
    info at granville dot nl
    19 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;

    }
    up
    5
    eric at projectsatellite dot com
    21 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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    4
    tomas at matfyz dot cz
    15 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
    up
    1
    bdobrica at gmail dot com
    18 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.
    up
    -8
    carl at NOSPAMthep dot lu dot se
    22 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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