Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

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

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><H1
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>maxdb_rollback</H1
><DIV
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><A
NAME="AEN112270"
></A
><P
>    (PECL)</P
>maxdb_rollback<P
>    (no version information, might be only in CVS)</P
>maxdb-&#62;rollback&nbsp;--&nbsp;Rolls back current transaction</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN112274"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>maxdb_rollback</B
> ( resource link )<BR
></BR
>class <B
CLASS="classname"
>maxdb</B
> { <BR
></BR
>bool <B
CLASS="methodname"
>rollback</B
> ( void  )<BR
></BR
>}<P
>&#13;   Rollbacks the current transaction for the database specified by the
   <CODE
CLASS="parameter"
>link</CODE
> parameter.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN112291"
></A
><H2
>Return values</H2
><P
>&#13;   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="AEN112296"
></A
><H2
>See also</H2
><P
>&#13;   <A
HREF="function.maxdb-commit.html"
><B
CLASS="function"
>maxdb_commit()</B
></A
>
   <A
HREF="function.maxdb-autocommit.html"
><B
CLASS="function"
>maxdb_autocommit()</B
></A
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN112301"
></A
><H2
>Example</H2
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><P
><B
>例 1. Object oriented style</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$maxdb </font><font color="#007700">= new </font><font color="#0000BB">maxdb</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"MONA"</font><font color="#007700">, </font><font color="#DD0000">"RED"</font><font color="#007700">, </font><font color="#DD0000">"DEMODB"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">maxdb_connect_errno</font><font color="#007700">()) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">maxdb_connect_error</font><font color="#007700">());<br />&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></font><font color="#FF8000">/* disable autocommit */<br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">autocommit</font><font color="#007700">(</font><font color="#0000BB">FALSE</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"CREATE TABLE temp.mycity LIKE hotel.city"</font><font color="#007700">);<br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"INSERT INTO temp.mycity SELECT * FROM hotel.city"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* commit insert */<br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">commit</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* delete all rows */<br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"DELETE FROM temp.mycity"</font><font color="#007700">);<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 COUNT(*) FROM temp.mycity"</font><font color="#007700">)) {<br />&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 />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"%d rows in table mycity.\n"</font><font color="#007700">, </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">]);<br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* Free result */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$result</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* Rollback */<br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">rollback</font><font color="#007700">();<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"SELECT COUNT(*) FROM temp.mycity"</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-&gt;</font><font color="#0000BB">fetch_row</font><font color="#007700">();<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"%d rows in table mycity (after rollback).\n"</font><font color="#007700">, </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">]);<br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* Free result */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$result</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* Drop table myCity */<br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"DROP TABLE temp.mycity"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?&gt;</font>
</font>
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><P
><B
>例 2. Procedural style</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">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 /></font><font color="#FF8000">/* disable autocommit */<br /></font><font color="#0000BB">maxdb_autocommit</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#0000BB">FALSE</font><font color="#007700">);<br /><br /></font><font color="#0000BB">maxdb_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"CREATE TABLE temp.mycity LIKE hotel.city"</font><font color="#007700">);<br /></font><font color="#0000BB">maxdb_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"INSERT INTO temp.mycity SELECT * FROM hotel.city"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* commit insert */<br /></font><font color="#0000BB">maxdb_commit</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* delete all rows */<br /></font><font color="#0000BB">maxdb_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"DELETE FROM temp.mycity"</font><font color="#007700">);<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">maxdb_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"SELECT COUNT(*) FROM temp.mycity"</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">maxdb_fetch_row</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"%d rows in table mycity.\n"</font><font color="#007700">, </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">]);<br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* Free result */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* Rollback */<br /></font><font color="#0000BB">maxdb_rollback</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<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 COUNT(*) FROM temp.mycity"</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">maxdb_fetch_row</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"%d rows in table mycity (after rollback).\n"</font><font color="#007700">, </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">]);<br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* Free result */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* Drop table myCity */<br /></font><font color="#0000BB">maxdb_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"DROP TABLE temp.mycity"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">maxdb_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></TD
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><P
>&#13;   The above examples would produce the following output:
  </P
><TABLE
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><TD
><PRE
CLASS="screen"
>0 rows in table mycity.
25 rows in table mycity (after rollback).</PRE
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