File: function.mysql-fetch-field.html

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<HTML
><HEAD
><TITLE
>mysql_fetch_field</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"><LINK
REL="HOME"
TITLE="PHP Manual"
HREF="manual.html"><LINK
REL="UP"
TITLE="MySQL functions"
HREF="ref.mysql.html"><LINK
REL="PREVIOUS"
TITLE="mysql_fetch_assoc"
HREF="function.mysql-fetch-assoc.html"><LINK
REL="NEXT"
TITLE="mysql_fetch_lengths"
HREF="function.mysql-fetch-lengths.html"><META
NAME="HTTP_EQUIV"
CONTENT="text/html; charset=ISO-8859-1"></HEAD
><BODY
CLASS="refentry"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>PHP Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="function.mysql-fetch-assoc.html"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="function.mysql-fetch-lengths.html"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.mysql-fetch-field"
>mysql_fetch_field</A
></H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN24281"
></A
><P
>    (PHP3 , PHP4 )</P
>mysql_fetch_field&nbsp;--&nbsp;
     Get column information from a result and return as an object
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN24284"
></A
><H2
>Description</H2
><DIV
CLASS="funcsynopsis"
><A
NAME="AEN24286"
></A
><P
></P
><P
><CODE
><CODE
CLASS="FUNCDEF"
>object <B
CLASS="function"
>mysql_fetch_field</B
></CODE
> (int result [, int 
       field_offset])</CODE
></P
><P
></P
></DIV
><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 null
       </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
>
    </P
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN24325"
></A
><P
><B
>Example 1. <B
CLASS="function"
>Mysql_fetch_field()</B
></B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>&#13;&#60;?php 
mysql_connect ($host, $user, $password)
    or die ("Could not connect");
$result = mysql_db_query ("database", "select * from table")
    or die ("Query failed");
# 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
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
><P
>&#13;     See also <A
HREF="function.mysql-field-seek.html"
><B
CLASS="function"
>mysql_field_seek()</B
></A
>.
    </P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="function.mysql-fetch-assoc.html"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="manual.html"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.mysql-fetch-lengths.html"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>mysql_fetch_assoc</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ref.mysql.html"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>mysql_fetch_lengths</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>