Papa Kuhikuhi ʻatikala
MySQLʻO ka hoʻokaʻawale ʻana i nā kūlana he nui?MySQL kauoha ma ka iho ʻana i ka ʻōlelo nīnau nīnau/hana
ʻano MySQL
ʻIke mākou e hoʻohana i ka ʻōlelo SQL SELECT e heluhelu i ka ʻikepili mai ka papa MySQL.
Inā pono mākou e hoʻokaʻawale i ka ʻikepili heluhelu, hiki iā mākou ke hoʻohana i ka MySQL KAUOHA E pauku e hoʻonohonoho i kahi kahua āu e makemake ai e hoʻokaʻawale ma ke ala hea, a laila e hoʻihoʻi i nā hopena hulina.
ʻōlelo ʻōlelo
ʻO kēia ka ʻōlelo SQL SELECT e hoʻohana ana i ka paukū ORDER BY e hoʻokaʻawale i ka ʻikepili nīnau ma mua o ka hoʻihoʻi ʻana i ka ʻikepili:
SELECT field1, field2,...fieldN table_name1, table_name2... ORDER BY field1, [field2...] [ASC [DESC]]
- Hiki iā ʻoe ke hoʻohana i kekahi kahua ma ke ʻano he ʻano ʻano e hoʻihoʻi i nā hopena hulina i koho ʻia.
- Hiki iā ʻoe ke hoʻonohonoho i nā mahina he nui e hoʻokaʻawale.
- Hiki iā ʻoe ke hoʻohana i nā huaʻōlelo ASC a i ʻole DESC e hoʻonohonoho i nā hopena hulina e hoʻokaʻawale ʻia ma ke kaʻina piʻi a iho.ʻO ka mea maʻamau, aia ma ka papa piʻi.
- Hiki iā ʻoe ke hoʻohui i nā māhele WHERE...LIKE e hoʻonohonoho i nā kūlana.
Ke hoʻohana nei i ka paukū ORDER BY ma ke kauoha kauoha
E hoʻohana kēia i ka paukū ORDER BY i ka ʻōlelo SQL SELECT e heluhelu i ka ʻikepili ma ka papa ʻikepili MySQL chenweiliang_tbl:
laʻana
E ho'āʻo i nā laʻana ma lalo nei a e hoʻokaʻawale ʻia nā hopena ma ke ʻano piʻi a me ka iho.
ʻano SQL
mysql> use chenweiliang; Database changed mysql> SELECT * from chenweiliang_tbl ORDER BY submission_date ASC; +-----------+---------------+---------------+-----------------+ | chenweiliang_id | chenweiliang_title | chenweiliang_author | submission_date | +-----------+---------------+---------------+-----------------+ | 3 | 学习 Java | chenweiliang.com | 2015-05-01 | | 4 | 学习 Python | chenweiliang.com | 2016-03-06 | | 1 | 学习 PHP | 陈沩亮博客 | 2017-04-12 | | 2 | 学习 MySQL | 陈沩亮博客 | 2017-04-12 | +-----------+---------------+---------------+-----------------+ 4 rows in set (0.01 sec) mysql> SELECT * from chenweiliang_tbl ORDER BY submission_date DESC; +-----------+---------------+---------------+-----------------+ | chenweiliang_id | chenweiliang_title | chenweiliang_author | submission_date | +-----------+---------------+---------------+-----------------+ | 1 | 学习 PHP | 陈沩亮博客 | 2017-04-12 | | 2 | 学习 MySQL | 陈沩亮博客 | 2017-04-12 | | 4 | 学习 Python | chenweiliang.com | 2016-03-06 | | 3 | 学习 Java | chenweiliang.com | 2015-05-01 | +-----------+---------------+---------------+-----------------+ 4 rows in set (0.01 sec)
Heluhelu i ka ʻikepili a pau ma ka papa chenweiliang_tbl a e hoʻokaʻawale i ka hoʻonohonoho piʻi ma ke kahua submission_date.
Ke hoʻohana nei i ka paukū ORDER BY ma kahi palapala PHP
Hiki iā ʻoe ke hoʻohana i ka hana PHP mysqli_query() a me ke kauoha SQL SELECT me kahi māhele ORDER BY e kiʻi i ka ʻikepili.
Hoʻohana ʻia kēia hana e hoʻokō i nā kauoha SQL a laila hoʻopuka i nā ʻikepili i nīnau ʻia ma o ka hana PHP mysqli_fetch_array().
laʻana
E ho'āʻo i kēia laʻana, ua hoʻihoʻi ʻia ka ʻikepili i nīnau ʻia ma ke ʻano iho o ke kahua submission_date.
MySQL ORDER MA ka ho'āʻo:
<?
php
$dbhost = 'localhost:3306'; // mysql服务器主机地址
$dbuser = 'root'; // mysql用户名
$dbpass = '123456'; // mysql用户名密码
$conn = mysqli_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
die('连接失败: ' . mysqli_error($conn));
}
// 设置编码，防止中文乱码
mysqli_query($conn , "set names utf8");
$sql = 'SELECT chenweiliang_id, chenweiliang_title,
chenweiliang_author, submission_date
FROM chenweiliang_tbl
ORDER BY submission_date ASC';
mysqli_select_db( $conn, 'chenweiliang' );
$retval = mysqli_query( $conn, $sql );
if(! $retval )
{
die('无法读取数据: ' . mysqli_error($conn));
}
echo '<h2>陈沩亮博客 MySQL ORDER BY 测试<h2>';
echo '<table border="1"><tr><td>教程 ID</td><td>标题</td><td>作者</td><td>提交日期</td></tr>';
while($row = mysqli_fetch_array($retval, MYSQL_ASSOC))
{
echo "<tr><td> {$row['chenweiliang_id']}</td> ".
"<td>{$row['chenweiliang_title']} </td> ".
"<td>{$row['chenweiliang_author']} </td> ".
"<td>{$row['submission_date']} </td> ".
"</tr>";
}
echo '</table>';
mysqli_close($conn);
?>Hope Chen Weiliang Blog ( https://www.chenweiliang.com/ ) kaʻana like "MySQL multi-field conditional sorting? MySQL order by descending and ascending query statement/function", he mea kōkua iā ʻoe.
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