《MYSQL數(shù)據(jù)庫PHP中ORDER BY子句的詳細(xì)用法教程》要點(diǎn)：
本文介紹了MYSQL數(shù)據(jù)庫PHP中ORDER BY子句的詳細(xì)用法教程，希望對您有用。如果有疑問，可以聯(lián)系我們。
我們已經(jīng)看到SQL SELECT命令來獲取數(shù)據(jù)從MySQL表.當(dāng)選擇行,MySQL服務(wù)器是自由返回,除非指示說如何排序結(jié)果否則它會自由返回.指定需要結(jié)果集增加一個ORDER BY子句要作為排序依據(jù)的列或列名進(jìn)行排序.
語法:MYSQL應(yīng)用
SELECT field1, field2,...fieldN table_name1, table_name2... ORDER BY field1, [field2...] [ASC [DESC]]
這里是通用的SQL的SELECT命令的語法,ORDER BY子句從MySQL表中的數(shù)據(jù)進(jìn)行排序：MYSQL應(yīng)用
在命令提示符下使用ORDER BY子句：MYSQL應(yīng)用
這將使用SQL SELECT命令來從MySQL表tutorials_tbl表中獲取數(shù)據(jù)ORDER BY子句
實(shí)例:MYSQL應(yīng)用
試試下面的示例升序返回結(jié)果.MYSQL應(yīng)用
root@host# mysql -u root -p password; Enter password:******* mysql> use TUTORIALS; Database changed mysql> SELECT * from tutorials_tbl ORDER BY tutorial_author ASC +-------------+----------------+-----------------+-----------------+ | tutorial_id | tutorial_title | tutorial_author | submission_date | +-------------+----------------+-----------------+-----------------+ | 2 | Learn MySQL | Abdul S | 2007-05-24 | | 1 | Learn PHP | John Poul | 2007-05-24 | | 3 | JAVA Tutorial | Sanjay | 2007-05-06 | +-------------+----------------+-----------------+-----------------+ 3 rows in set (0.42 sec) mysql>
所有作者的名字列按升序排列.
PHP腳本使用ORDER BY子句:MYSQL應(yīng)用
可以使用類似的語法的ORDER BY子句到PHP函數(shù)mysql_query().這個函數(shù)是用來執(zhí)行SQL命令后,另一個PHP函數(shù)mysql_fetch_array()可以用來獲取所有選定的數(shù)據(jù).
例子:MYSQL應(yīng)用
試試下面的示例教程作者降序返回結(jié)果.MYSQL應(yīng)用
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
$sql = 'SELECT tutorial_id, tutorial_title,
tutorial_author, submission_date
FROM tutorials_tbl
ORDER BY tutorial_author DESC';
mysql_select_db('TUTORIALS');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
die('Could not get data: ' . mysql_error());
}
while($row = mysql_fetch_array($retval, MYSQL_ASSOC))
{
echo "Tutorial ID :{$row['tutorial_id']} <br> ".
"Title: {$row['tutorial_title']} <br> ".
"Author: {$row['tutorial_author']} <br> ".
"Submission Date : {$row['submission_date']} <br> ".
"--------------------------------<br>";
}
echo "Fetched data successfully\n";
mysql_close($conn);
?>
?MYSQL應(yīng)用
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