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Updating mysqli: data_seek

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* Simplified examples
* Add mysqli_stmt_get_result
* Fix example tags
* Added a secondary example
* Fix code comments

Closes GH-887.
This commit is contained in:
Kamil Tekiela 2021-09-14 14:25:19 +01:00 committed by GitHub
parent fd6629b1ac
commit 67c340d029
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1 changed files with 74 additions and 48 deletions
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122
reference/mysqli/mysqli_result/data-seek.xml
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@ -55,79 +55,105 @@
<refsect1 role="examples">
&reftitle.examples;
<example>
<title>&style.oop;</title>
<title><methodname>mysqli::data_seek</methodname> example</title>
<para>&style.oop;</para>
<programlisting role="php">
<![CDATA[
<?php
/* Open a connection */
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT Name, CountryCode FROM City ORDER BY Name";
if ($result = $mysqli->query($query)) {
$result = $mysqli->query($query);
/* seek to row no. 400 */
$result->data_seek(399);
/* Seek to row no. 401 */
$result->data_seek(400);
/* fetch row */
$row = $result->fetch_row();
/* Fetch single row */
$row = $result->fetch_row();
printf ("City: %s Countrycode: %s\n", $row[0], $row[1]);
/* free result set*/
$result->close();
}
/* close connection */
$mysqli->close();
?>
printf("City: %s Countrycode: %s\n", $row[0], $row[1]);
]]>
</programlisting>
</example>
<example>
<title>&style.procedural;</title>
<para>&style.procedural;</para>
<programlisting role="php">
<![CDATA[
<?php
/* Open a connection */
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
$query = "SELECT Name, CountryCode FROM City ORDER BY Name";
if ($result = mysqli_query($link, $query)) {
$result = mysqli_query($link, $query);
/* seek to row no. 400 */
mysqli_data_seek($result, 399);
/* Seek to row no. 401 */
mysqli_data_seek($result, 400);
/* fetch row */
$row = mysqli_fetch_row($result);
/* Fetch single row */
$row = mysqli_fetch_row($result);
printf ("City: %s Countrycode: %s\n", $row[0], $row[1]);
/* free result set*/
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>
printf ("City: %s Countrycode: %s\n", $row[0], $row[1]);
]]>
</programlisting>
&examples.outputs;
<screen>
<![CDATA[
City: Benin City Countrycode: NGA
]]>
</screen>
</example>
<example>
<title>Adjusting the result pointer when iterating</title>
<para>
This function can be useful when iterating over the result set to impose
a custom order or rewind the result set when iterating multiple times.
</para>
<programlisting role="php">
<![CDATA[
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 15,4";
$result = $mysqli->query($query);
/* Iterate the result set in reverse order */
for ($row_no = $result->num_rows - 1; $row_no >= 0; $row_no--) {
$result->data_seek($row_no);
/* Fetch single row */
$row = $result->fetch_row();
printf("City: %s Countrycode: %s\n", $row[0], $row[1]);
}
/* Reset pointer to the beginning of the result set */
$result->data_seek(0);
print "\n";
/* Iterate the same result set again */
while ($row = $result->fetch_row()) {
printf("City: %s Countrycode: %s\n", $row[0], $row[1]);
}
]]>
</programlisting>
&examples.outputs;
<screen>
<![CDATA[
City: Acmbaro Countrycode: MEX
City: Abuja Countrycode: NGA
City: Abu Dhabi Countrycode: ARE
City: Abottabad Countrycode: PAK
City: Abottabad Countrycode: PAK
City: Abu Dhabi Countrycode: ARE
City: Abuja Countrycode: NGA
City: Acmbaro Countrycode: MEX
]]>
</screen>
</example>
@ -138,8 +164,8 @@ City: Benin City Countrycode: NGA
<note>
<para>
This function can only be used with buffered results attained from the
use of the <function>mysqli_store_result</function> or
<function>mysqli_query</function> functions.
use of the <function>mysqli_store_result</function>,
<function>mysqli_query</function> or <function>mysqli_stmt_get_result</function> functions.
</para>
</note>
</refsect1>