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><H1
><A
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>mysql_data_seek</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN135133"
></A
><P
> (PHP 3, PHP 4, PHP 5)</P
>mysql_data_seek -- 移动内部结果的指针</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN135136"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>mysql_data_seek</B
> ( resource result, int row_number )<BR
></BR
><P
> <B
CLASS="function"
>mysql_data_seek()</B
> 将指定的结果标识所关联的
MySQL 结果内部的行指针移动到指定的行号。接着调用
<A
HREF="function.mysql-fetch-row.html"
><B
CLASS="function"
>mysql_fetch_row()</B
></A
> 将返回那一行。
</P
><P
> <CODE
CLASS="parameter"
>row_number</CODE
> 从 0 开始。<CODE
CLASS="parameter"
>row_number</CODE
>
的取值范围应该从 0 到 mysql_num_rows - 1。但是如果结果集为空（<A
HREF="function.mysql-num-rows.html"
><B
CLASS="function"
>mysql_num_rows()</B
></A
>
== 0），要将指针移动到 0 会失败并发出 <A
HREF="ref.errorfunc.html#e-warning"
>E_WARNING</A
>
级的错误，<B
CLASS="function"
>mysql_data_seek()</B
> 将返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN135157"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
> result</CODE
></DT
><DD
><P
>返回类型为 <A
HREF="language.types.resource.html"
><B
CLASS="type"
>resource</B
></A
> 的结果集。该结果集从
<A
HREF="function.mysql-query.html"
><B
CLASS="function"
>mysql_query()</B
></A
> 的调用中得到。</P
></DD
><DT
><CODE
CLASS="parameter"
>row_number</CODE
></DT
><DD
><P
> 想要设定的新的结果集指针的行数。
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN135173"
></A
><H2
>返回值</H2
><P
> 如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN135178"
></A
><H2
>范例</H2
><P
> <TABLE
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><DIV
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NAME="AEN135181"
></A
><P
><B
>例 1. <B
CLASS="function"
>mysql_data_seek()</B
> 例子</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">mysql_connect</font><font color="#007700">(</font><font color="#DD0000">'localhost'</font><font color="#007700">, </font><font color="#DD0000">'mysql_user'</font><font color="#007700">, </font><font color="#DD0000">'mysql_password'</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$link</font><font color="#007700">) {<br /> die(</font><font color="#DD0000">'Could not connect: ' </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">());<br />}<br /></font><font color="#0000BB">$db_selected </font><font color="#007700">= </font><font color="#0000BB">mysql_select_db</font><font color="#007700">(</font><font color="#DD0000">'sample_db'</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$db_selected</font><font color="#007700">) {<br /> die(</font><font color="#DD0000">'Could not select database: ' </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">());<br />}<br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">'SELECT last_name, first_name FROM friends'</font><font color="#007700">;<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysql_query</font><font color="#007700">(</font><font color="#0000BB">$query</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$result</font><font color="#007700">) {<br /> die(</font><font color="#DD0000">'Query failed: ' </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">());<br />}<br /></font><font color="#FF8000">/* fetch rows in reverse order */<br /></font><font color="#007700">for (</font><font color="#0000BB">$i </font><font color="#007700">= </font><font color="#0000BB">mysql_num_rows</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">) - </font><font color="#0000BB">1</font><font color="#007700">; </font><font color="#0000BB">$i </font><font color="#007700">>= </font><font color="#0000BB">0</font><font color="#007700">; </font><font color="#0000BB">$i</font><font color="#007700">--) {<br /> if (!</font><font color="#0000BB">mysql_data_seek</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">, </font><font color="#0000BB">$i</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"Cannot seek to row $i: " </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">() . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /> continue;<br /> }<br /><br /> if (!(</font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">mysql_fetch_assoc</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">))) {<br /> continue;<br /> }<br /><br /> echo </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">'last_name'</font><font color="#007700">] . </font><font color="#DD0000">' ' </font><font color="#007700">. </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">'first_name'</font><font color="#007700">] . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br />}<br /><br /></font><font color="#0000BB">mysql_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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></TD
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>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN135185"
></A
><H2
>注释</H2
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
<B
CLASS="function"
>mysql_data_seek()</B
> 只能和
<A
HREF="function.mysql-query.html"
><B
CLASS="function"
>mysql_query()</B
></A
> 结合起来使用，而不能用于
<A
HREF="function.mysql-unbuffered-query.html"
><B
CLASS="function"
>mysql_unbuffered_query()</B
></A
>。
</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN135192"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
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><TR
><TD
><A
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><B
CLASS="function"
>mysql_query()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysql-num-rows.html"
><B
CLASS="function"
>mysql_num_rows()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysql-fetch-row.html"
><B
CLASS="function"
>mysql_fetch_row()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysql-fetch-assoc.html"
><B
CLASS="function"
>mysql_fetch_assoc()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysql-fetch-array.html"
><B
CLASS="function"
>mysql_fetch_array()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysql-fetch-object.html"
><B
CLASS="function"
>mysql_fetch_object()</B
></A
></TD
></TR
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></P
>
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