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

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><H1
><A
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>maxdb_num_rows</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN111741"
></A
><P
>    (PECL)</P
>maxdb_num_rows&nbsp;--&nbsp;Gets the number of rows in a result</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111744"
></A
><H2
>Description</H2
><P
>Procedural style:</P
>int <B
CLASS="methodname"
>maxdb_num_rows</B
> ( resource result )<BR
></BR
><P
>Object oriented style (property):</P
>class <B
CLASS="classname"
>maxdb</B
> { <BR
></BR
>int num_rows<BR
></BR
>}<P
>&#13;   Returns the number of rows in the result set.
  </P
><P
>&#13;   The use of <B
CLASS="function"
>maxdb_num_rows()</B
> depends on whether you use
   buffered or unbuffered result sets.
   In case you use unbuffered resultsets <B
CLASS="function"
>maxdb_num_rows()</B
>
   will not correct the correct number of rows until all the rows in the result
   have been retrieved.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111764"
></A
><H2
>返回值</H2
><P
>&#13;   Returns number of rows in the result set.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    If the number of rows is greater than maximal int value, the number
    will be returned as a string.
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111769"
></A
><H2
>参见</H2
><P
>&#13;   <A
HREF="function.maxdb-affected-rows.html"
><B
CLASS="function"
>maxdb_affected_rows()</B
></A
>
   <A
HREF="function.maxdb-store-result.html"
><B
CLASS="function"
>maxdb_store_result()</B
></A
>
   <A
HREF="function.maxdb-use-result.html"
><B
CLASS="function"
>maxdb_use_result()</B
></A
>
   <A
HREF="function.maxdb-query.html"
><B
CLASS="function"
>maxdb_query()</B
></A
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111776"
></A
><H2
>Example</H2
><TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN111778"
></A
><P
><B
>例 1. Object oriented style</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$maxdb </font><font color="#007700">= new </font><font color="#0000BB">maxdb</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"MONA"</font><font color="#007700">, </font><font color="#DD0000">"RED"</font><font color="#007700">, </font><font color="#DD0000">"DEMODB"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">maxdb_connect_errno</font><font color="#007700">()) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">maxdb_connect_error</font><font color="#007700">());<br />&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"SELECT cno, name FROM hotel.customer ORDER BY name"</font><font color="#007700">)) {<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* determine number of rows result set */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$row_cnt </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-&gt;</font><font color="#0000BB">num_rows</font><font color="#007700">;<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Result set has %d rows.\n"</font><font color="#007700">, </font><font color="#0000BB">$row_cnt</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* close result set */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$result</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$maxdb</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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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN111781"
></A
><P
><B
>例 2. Procedural style</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">maxdb_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"MONA"</font><font color="#007700">, </font><font color="#DD0000">"RED"</font><font color="#007700">, </font><font color="#DD0000">"DEMODB"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">maxdb_connect_errno</font><font color="#007700">()) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">maxdb_connect_error</font><font color="#007700">());<br />&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">maxdb_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"SELECT cno, name FROM hotel.customer ORDER BY name"</font><font color="#007700">)) {<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* determine number of rows result set */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$row_cnt </font><font color="#007700">= </font><font color="#0000BB">maxdb_num_rows</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Result set has %d rows.\n"</font><font color="#007700">, </font><font color="#0000BB">$row_cnt</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* close result set */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">maxdb_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></DIV
></TD
></TR
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><P
>&#13;   The above examples would produce the following output:
  </P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
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><TR
><TD
><PRE
CLASS="screen"
>Result set has 15 rows.</PRE
></TD
></TR
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