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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.mysqli-field-count"
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>mysqli_field_count</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN139194"
></A
><P
>    (PHP 5)</P
>mysqli_field_count<P
>    (no version information, might be only in CVS)</P
>mysqli-&#62;field_count()&nbsp;--&nbsp;Returns the number of columns for the most recent query</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN139198"
></A
><H2
>说明</H2
><P
>Procedural style:</P
>int <B
CLASS="methodname"
>mysqli_field_count</B
> ( mysqli link )<BR
></BR
><P
>Object oriented style (method):</P
>class <B
CLASS="classname"
>mysqli_result</B
> { <BR
></BR
>int <B
CLASS="methodname"
>field_count</B
> ( void  )<BR
></BR
>}<P
>&#13;   Returns the number of columns for the most recent query on the connection
   represented by the <CODE
CLASS="parameter"
>link</CODE
> parameter. This function
   can be useful when using the <A
HREF="function.mysqli-store-result.html"
><B
CLASS="function"
>mysqli_store_result()</B
></A
>
   function to determine if the query should have produced a non-empty result
   set or not without knowing the nature of the query.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN139218"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>&#13;link</CODE
></DT
><DD
><P
>Procedural style only: A link identifier
returned by <A
HREF="function.mysqli-connect.html"
><B
CLASS="function"
>mysqli_connect()</B
></A
> or <A
HREF="function.mysqli-init.html"
><B
CLASS="function"
>mysqli_init()</B
></A
>
</P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN139229"
></A
><H2
>返回值</H2
><P
>&#13;   An integer representing the number of fields in a result set.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN139232"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN139235"
></A
><P
><B
>例 1. Object oriented style</B
></P
><TABLE
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BGCOLOR="#E0E0E0"
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><TR
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$mysqli </font><font color="#007700">= new </font><font color="#0000BB">mysqli</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"test"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">( </font><font color="#DD0000">"DROP TABLE IF EXISTS friends"</font><font color="#007700">);<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">( </font><font color="#DD0000">"CREATE TABLE friends (id int, name varchar(20))"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">( </font><font color="#DD0000">"INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"</font><font color="#007700">);<br /><br /><br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">real_query</font><font color="#007700">(</font><font color="#0000BB">$HTTP_POST_VARS</font><font color="#007700">[</font><font color="#DD0000">'query'</font><font color="#007700">]);<br /><br />if (</font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">field_count</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* this was a select/show or describe query */<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">store_result</font><font color="#007700">();<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* process resultset */<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-&gt;</font><font color="#0000BB">fetch_row</font><font color="#007700">();<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* free resultset */<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$result</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
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><DIV
CLASS="example"
><A
NAME="AEN139238"
></A
><P
><B
>例 2. Procedural style</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">mysqli_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"test"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"DROP TABLE IF EXISTS friends"</font><font color="#007700">);<br /></font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"CREATE TABLE friends (id int, name varchar(20))"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">mysqli_real_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#0000BB">$HTTP_POST_VARS</font><font color="#007700">[</font><font color="#DD0000">'query'</font><font color="#007700">]);<br /><br />if (</font><font color="#0000BB">mysqli_field_count</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* this was a select/show or describe query */<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysqli_store_result</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* process resultset */<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">mysqli_fetch_row</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* free resultset */<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">mysqli_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">mysqli_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
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