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>fbsql_fetch_field</H1
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NAME="AEN59268"
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><P
>    (PHP 4 &#62;= 4.0.6, PHP 5)</P
>fbsql_fetch_field&nbsp;--&nbsp;Get column information from a result and return as an object</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN59271"
></A
><H2
>说明</H2
>object <B
CLASS="methodname"
>fbsql_fetch_field</B
> ( resource result [, int field_offset] )<BR
></BR
><P
>&#13;   Used in order to obtain information about fields in a certain query result.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN59283"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>&#13;result</CODE
></DT
><DD
><P
>A result identifier
returned by <A
HREF="function.fbsql-query.html"
><B
CLASS="function"
>fbsql_query()</B
></A
> or 
<A
HREF="function.fbsql-db-query.html"
><B
CLASS="function"
>fbsql_db_query()</B
></A
>.</P
></DD
><DT
><CODE
CLASS="parameter"
>field_offset</CODE
></DT
><DD
><P
>&#13;       The numerical offset of the field. The field index starts at 0.
       If not specified, the next field that wasn't yet retrieved by 
       <B
CLASS="function"
>fbsql_fetch_field()</B
> is retrieved.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN59300"
></A
><H2
>返回值</H2
><P
>&#13;   Returns an object containing field information, or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on errors.
  </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;      type - the type of the column
     </P
></LI
></UL
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN59317"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><P
><B
>例 1. <B
CLASS="function"
>fbsql_fetch_field()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />fbsql_connect</font><font color="#007700">(</font><font color="#0000BB">$host</font><font color="#007700">, </font><font color="#0000BB">$user</font><font color="#007700">, </font><font color="#0000BB">$password</font><font color="#007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;or die(</font><font color="#DD0000">"Could not connect"</font><font color="#007700">);<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">fbsql_db_query</font><font color="#007700">(</font><font color="#DD0000">"database"</font><font color="#007700">, </font><font color="#DD0000">"select * from table"</font><font color="#007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;or die(</font><font color="#DD0000">"Query failed"</font><font color="#007700">);<br /></font><font color="#FF8000"># get column metadata<br /></font><font color="#0000BB">$i </font><font color="#007700">= </font><font color="#0000BB">0</font><font color="#007700">;<br />while (</font><font color="#0000BB">$i </font><font color="#007700">&lt; </font><font color="#0000BB">fbsql_num_fields</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Information for column $i:&lt;br /&gt;</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$meta </font><font color="#007700">= </font><font color="#0000BB">fbsql_fetch_field</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;if (!</font><font color="#0000BB">$meta</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"No information available&lt;br /&gt;\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"&lt;pre&gt;<br />max_length:&nbsp;&nbsp;&nbsp;$meta</font><font color="#007700">-&gt;</font><font color="#DD0000">max_length<br />name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$meta</font><font color="#007700">-&gt;</font><font color="#DD0000">name<br />not_null:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$meta</font><font color="#007700">-&gt;</font><font color="#DD0000">not_null<br />table:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$meta</font><font color="#007700">-&gt;</font><font color="#DD0000">table<br />type:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$meta</font><font color="#007700">-&gt;</font><font color="#DD0000">type<br />&lt;/pre&gt;"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$i</font><font color="#007700">++;<br />}<br /></font><font color="#0000BB">fbsql_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
  </P
></DIV
><DIV
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></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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