mysql_field_flags

(PHP 4, PHP 5)

mysql_field_flags결과로부터 특정 필드와 관련된 플래그를 반환

설명

string mysql_field_flags ( resource $result , int $field_offset )

mysql_field_flags()는 지정된 필드의 플래그를 반환한다. 플래그는 공백문자로 구분된 하나의 플래그당 하나의 단어로 구성되며, explode()를 사용하여 반환되는 값을 분리할 수 있다.

인수

result

mysql_query() 호출을 통한 결과 resource.

field_offset

The numerical field offset. The field_offset starts at 0. If field_offset does not exist, an error of level E_WARNING is also issued.

반환값

결과와 연관된 플래그 문자열을 반환하고, 실패하면 FALSE를 반환한다.

MySQL의 버전이 이들을 지원한다면, 다음 플래그들을 볼 수 있다: "not_null", "primary_key", "unique_key", "multiple_key", "blob", "unsigned", "zerofill", "binary", "enum", "auto_increment", "timestamp".

예제

Example #1 mysql_field_flags() 예제

<?php
$result 
mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!
$result) {
    echo 
'Could not run query: ' mysql_error();
    exit;
}
$flags mysql_field_flags($result0);

echo 
$flags;
print_r(explode(' '$flags));
?>

위 예제의 출력 예시:

not_null primary_key auto_increment
Array
(
    [0] => not_null
    [1] => primary_key
    [2] => auto_increment
)

주의

Note:

하위 호환을 위하여, 다음의 권장하지 않는 별칭을 사용할 수 있습니다: mysql_fieldflags()

참고

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User Contributed Notes 10 notes

up
3
cufarley at nirvanet dot net
19 years ago
Using the "DESC TableName" command may also do the trick and is a bit shorter.
up
4
amir at scrounch dot com
16 years ago
returns primary keys of a table using 'show keys'
although it is possible to use desc, show keys offers possible enhancements such a getting sequence in index along with it

function getPrimaryKeyOf($table, $link) {
  $pk = Array();

  $sql = 'SHOW KEYS FROM `'.$table.'`';
  $res = mysql_query($table, $link) or die(mysql_error());
  while ($row = mysql_fetch_assoc($res)) {
    if ($row['Key_name']=='PRIMARY')
      array_push($pk, $row['Column_name']);
  }
  return $pk;
}
up
1
play at arcadevillage dot com
11 years ago
To really backup the database values, I made a little changement :

My code really looks like bomas 's code, but there is an important diffence :

<?php
$nbc
= mysql_num_fields($req_table);
while (
$ligne = mysql_fetch_array($req_table))
  {
   
$insertions = "INSERT INTO $table VALUES(";
     for (
$i=0; $i<$nbc; $i++)
        {
          if (
$i > 0 ) $insertions .= ", ";
          if ( !isset(
$ligne[$i]))
           
$insertions .= "NULL";
          else
           
$insertions .= "'" . mysql_real_escape_string($ligne[$i]). "'";
        }
    
$insertions .= ");";
    
$dumpsql[] = $insertions;
   }
?>

$dumpslq is the variable where I put the insertion orders before writting them in a text file.

Before, I test that the values if not NULL into the field because it is the only way to make the difference, for example for string text fields, between NULL values and empty strings.

If you don't make this test, you should find empty string instead of NULL values when you do the backup.
up
1
pike-php at kw dot nl
15 years ago
ok, sorry for the code bloat :) but this is how I
get the full power of mysql's DESCRIBE table statement, in
an associative array, including defaults, enum values, float radix et all.

it assumes mysql returns the type as
   "type[(arg[,arg..])] [ add]"
like
   "float(20,6) unsigned"
   "enum('yes','no')"
etc

<?

function getFields($tablename) {
   
        $fields = array();
        $fullmatch         = "/^([^(]+)(\([^)]+\))?(\s(.+))?$/";
        $charlistmatch     = "/,?'([^']*)'/";
        $numlistmatch     = "/,?(\d+)/";
       
        $fieldsquery .= "DESCRIBE $tablename";
        $result_fieldsquery = mysql_query($fieldsquery) or die(mysql_error());
        while ($row_fieldsquery = mysql_fetch_assoc($result_fieldsquery)) {
           
            $name     = $row_fieldsquery['Field'];
            $fields[$name] = array();
            $fields[$name]["type"]         = "";
            $fields[$name]["args"]         = array();
            $fields[$name]["add"]          = "";
            $fields[$name]["null"]        = $row_fieldsquery['Null'];
            $fields[$name]["key"]        = $row_fieldsquery['Key'];
            $fields[$name]["default"]    = $row_fieldsquery['Default'];
            $fields[$name]["extra"]        = $row_fieldsquery['Extra'];
           
            $fulltype     = $row_fieldsquery['Type'];
            $typeregs = array();
           
            if (preg_match($fullmatch, $fulltype, $typeregs)) {
                $fields[$name]["type"] = $typeregs[1];
                if ($typeregs[4]) $fields[$name]["add"] = $typeregs[4];
                $fullargs = $typeregs[2];
                $argsreg = array();
                if (preg_match_all($charlistmatch, $fullargs, $argsreg)) {
                    $fields[$name]["args"] = $argsreg[1];
                } else {
                    $argsreg = array();
                    if (preg_match_all($numlistmatch, $fullargs, $argsreg)) {
                        $fields[$name]["args"] = $argsreg[1];
                    } else die("cant parse type args: $fullargs");
                }
            } else die("cant parse type: $fulltype");

        }
        return $fields;
           
    }

?>
up
0
simone dot t at betisgroup dot com
17 years ago
Another examples :

####################################

function field_keys($host, $user, $password, $database, $field ) {
   $db_link = mysql_connect($host, $user, $password) or die ("error connect");
   mysql_select_db($database,$db_link);
   $query="DESC $field";
   $results=mysql_query($query);
   $i=0;
   while ($row=mysql_fetch_array($results)) {
         if ($row[Key]=="PRI") {
            $array_keys[$i]=$row[Field];
         }
         $i++;
  }
   return $array_keys;
}

####################################

//Example of Main...
$tmp = field_keys("localhost", "myuser", "mypassword", "mydb", "field_name" );

// ...loop through array...
foreach ( $tmp as $array_tmp){
    print "<br>";
    print $array_tmp;
    print "<br>";
}
up
0
jakemsr at jakemsr dot com
17 years ago
I didn't find anything to get the valid values for
ENUM or SET column types, so I came up with the
following

function mysql_enum_values($table, $field)
{
    $sql = "SHOW COLUMNS FROM $table LIKE '$field'";
    $sql_res = mysql_query($sql)
        or die("Could not query:\n$sql");
    $row = mysql_fetch_assoc($sql_res);
    mysql_free_result($sql_res);
    return(explode("','",
        preg_replace("/.*\('(.*)'\)/", "\\1",
            $row["Type"])));
}
up
-1
bomas at cities-of-faith dot com
14 years ago
well, to make a complete backup of your database, i suggest this code:

//open database here
$tab_status = mysql_query("SHOW TABLE STATUS");
while($all = mysql_fetch_assoc($tab_status)):
    $tbl_stat[$all[Name]] = $all[Auto_increment];
endwhile;
unset($backup);
$tables = mysql_list_tables('cofadmin');
while($tabs = mysql_fetch_row($tables)):
    $backup .= "--\n--Tabel structuur voor `$tabs[0]`\n--\n\nDROP IF EXISTS TABLE `$tabs[0]`\nCREATE TABLE IF NOT EXISTS `$tabs[0]` (&nbsp;";
    $res = mysql_query("SHOW CREATE TABLE $tabs[0]");
    while($all = mysql_fetch_assoc($res)):
        $str = str_replace("CREATE TABLE `$tabs[0]` (", "", $all['Create Table']);
        $str = str_replace(",", ",&nbsp;", $str);
        $str2 = str_replace("`) ) TYPE=MyISAM ", "`)\n ) TYPE=MyISAM ", $str);
        $backup .= $str2." AUTO_INCREMENT=".$tbl_stat[$tabs[0]].";\n\n";
    endwhile;
    $backup .= "--\n--Gegevens worden uitgevoerd voor tabel `$tabs[0]`\n--\n\n";
    $data = mysql_query("SELECT * FROM $tabs[0]");
    while($dt = mysql_fetch_row($data)):
        $backup .= "INSERT INTO `$tabs[0]` VALUES('$dt[0]'";
        for($i=1; $i<sizeof($dt); $i++):
            $backup .= ", '$dt[$i]'";
        endfor;
        $backup .= ");\n";
    endwhile;
    $backup .= "\n-- --------------------------------------------------------\n\n";
endwhile;
echo $backup;

this displayes your data the same way as phpmyadmin does.

hope it helps some of you guys
Greetz
up
-1
buttrose at unimelb dot edu dot au
15 years ago
This function is essential for writing a generic table editor (ie one that just takes the name of the table and works out what fields it has, types, sizes etc.). Unfortunately, I am using psotgreSQL not mySql. Postgres has field_type and field_size functions  but not as far as I can tell an equivalent of the mysql_field_flags() function. Without it, there is no way I can do generic ADDs and INSERTs.

Anyone know a workaround to get this information (eg is the field a primary key? Can it be NULL? Is it auto_increment?) in Postgres?

Cheers

Rob Buttrose
up
-2
justin DOT flavin AT ntlworld DOT com
17 years ago
Sometimes, when writing a generic function or class, you want your script to be able to determine what the primary key of a table is.
/* usual MySQL stuff */
$query="DESC UsersTable";
$results=mysql_query($query);

while ($row=mysql_fetch_array($results))
{
if ($row[Type]="PRI")
    {
print "I found the primary key! <br>";
$UserKey=$row[Field];
print $row[Field];
/* drop out , as we've found the key */   
exit;
    }
}

..... later on we might have something like

< some sort of loop through records >

print "<a href='View_User_record.php?userkey=$UserKey'> Users Name </a>";

<end loop>

What's also interesting is the useful data you can get from
a DESC query.

The following prints out the array values grabbed by mysql_fetch_array on a DESC query - VERY useful stuff!!!

/* usual MySQL stuff */
$query="DESC UsersTable";
$results=mysql_query($query);

while ($row=mysql_fetch_array($results))
{
print "<pre>";
print_r ($row);
print "</pre>";
}
up
-3
jurgen at alienguitar dot com
19 years ago
The previous problem to get the default values of a column:
Use the following query and parse the 'Default' column:

"SHOW COLUMNS FROM TableName"

or for a single entry:

"SHOW COLUMNS FROM TableName LIKE 'column'"

It will give you also values for Type,  Null, Key and Extra (check with mysql program first, so you see what you get ;-)
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