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php-manual-en-4.3.0-2mdk.noarch.rpm

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>mysql_fetch_field</H1
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>    (PHP 3, PHP 4 )</P
>mysql_fetch_field&nbsp;--&nbsp;
     Get column information from a result and return as an object
    </DIV
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><H2
>Description</H2
>object <B
CLASS="methodname"
>mysql_fetch_field</B
> ( resource result [, int field_offset])<BR
></BR
><P
>&#13;     Returns an object containing field information.
    </P
><P
>&#13;     <B
CLASS="function"
>mysql_fetch_field()</B
> can be used in order to
     obtain information about fields in a certain query result.  If
     the field offset isn't specified, the next field that wasn't yet
     retrieved by <B
CLASS="function"
>mysql_fetch_field()</B
> is retrieved.
    </P
><P
>&#13;     The properties of the object are:
     <P
></P
><UL
><LI
><P
>&#13;        name - column name
       </P
></LI
><LI
><P
>&#13;        table - name of the table the column belongs to
       </P
></LI
><LI
><P
>&#13;        max_length - maximum length of the column
       </P
></LI
><LI
><P
>&#13;        not_null - 1 if the column cannot be <TT
CLASS="constant"
><B
>NULL</B
></TT
>
       </P
></LI
><LI
><P
>&#13;        primary_key - 1 if the column is a primary key
       </P
></LI
><LI
><P
>&#13;        unique_key - 1 if the column is a unique key
       </P
></LI
><LI
><P
>&#13;        multiple_key - 1 if the column is a non-unique key
       </P
></LI
><LI
><P
>&#13;        numeric - 1 if the column is numeric
       </P
></LI
><LI
><P
>&#13;        blob - 1 if the column is a BLOB
       </P
></LI
><LI
><P
>&#13;        type - the type of the column
       </P
></LI
><LI
><P
>&#13;        unsigned - 1 if the column is unsigned
       </P
></LI
><LI
><P
>&#13;        zerofill - 1 if the column is zero-filled
       </P
></LI
></UL
>
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><B
>Example 1. <B
CLASS="function"
>mysql_fetch_field()</B
></B
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><PRE
CLASS="php"
>&#60;?php
mysql_connect('localhost:3306', $user, $password)
    or die("Could not connect: " . mysql_error());
mysql_select_db("database");
$result = mysql_query("select * from table")
    or die("Query failed: " . mysql_error());
/* get column metadata */
$i = 0;
while ($i &#60; mysql_num_fields($result)) {
    echo "Information for column $i:&#60;br /&#62;\n";
    $meta = mysql_fetch_field($result);
    if (!$meta) {
        echo "No information available&#60;br /&#62;\n";
    }
    echo "&#60;pre&#62;
blob:         $meta-&#62;blob
max_length:   $meta-&#62;max_length
multiple_key: $meta-&#62;multiple_key
name:         $meta-&#62;name
not_null:     $meta-&#62;not_null
numeric:      $meta-&#62;numeric
primary_key:  $meta-&#62;primary_key
table:        $meta-&#62;table
type:         $meta-&#62;type
unique_key:   $meta-&#62;unique_key
unsigned:     $meta-&#62;unsigned
zerofill:     $meta-&#62;zerofill
&#60;/pre&#62;";
    $i++;
}
mysql_free_result($result);
?&#62;</PRE
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><P
>&#13;     See also <A
HREF="function.mysql-field-seek.html"
><B
CLASS="function"
>mysql_field_seek()</B
></A
>.
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