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MySQLNhazi ọnọdụ ọtụtụ ubi?MySQL ịtụ site n'ịrịda na ịrịgo nkwupụta/ọrụ ajụjụ
Ụdị MySQL
Anyị maara iji nkwupụta SQL SELECT ịgụ data sitere na tebụl MySQL.
Ọ bụrụ na anyị kwesịrị ịhazi data agụ, anyị nwere ike iji MySQL T ORR BY site na Nkejiokwu ka ịtọọ mpaghara nke ịchọrọ ịhazi site n'ụzọ, wee weghachi nsonaazụ ọchụchọ.
ụtọ asụsụ
Nke a bụ nkwupụta SQL SELECT nke na-eji ORDER BY nkebiokwu iji dozie data ajụjụ tupu iweghachite data:
SELECT field1, field2,...fieldN table_name1, table_name2... ORDER BY field1, [field2...] [ASC [DESC]]
- Ị nwere ike iji mpaghara ọ bụla dị ka ụdị ọnọdụ iji weghachi rịzọlt a haziri ahazi.
- Ị nwere ike ịtọ ọtụtụ ubi ka ịhazi.
- Ị nwere ike iji mkpụrụokwu ASC ma ọ bụ DESC iji tọọ nsonaazụ ajụjụ a ga-ahazi n'usoro nrịgo ma ọ bụ na-agbada.Site na ndabara, ọ nọ n'usoro nrịgo.
- Ị nwere ike ịgbakwunye Ebe...Dị ka nkebiokwu iji tọọ ọnọdụ.
Iji ORDER BY nkebiokwu dị na ngwa ngwa iwu
Ihe ndị a ga-eji nkebiokwu ORDER BY dị na nkwupụta SQL SELECT ịgụ data dị na MySQL data table chenweiliang_tbl:
ihe atụ
Gbalịa ihe atụ ndị dị n'okpuru, a ga-ahazikwa nsonaazụ ya n'usoro nrịgo na mgbada.
Ụdị 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)
Gụọ data niile dị na tebụl chenweiliang_tbl wee hazie n'usoro na-arịgo site na ubi submission_date.
Iji nkeji okwu ORDER BY na edemede PHP
Ị nwere ike iji PHP ọrụ mysqli_query() na otu iwu SQL SELECT nwere ORDER BY nkeji iji nweta data ahụ.
A na-eji ọrụ a iji mezuo iwu SQL wee wepụta data niile achọrọ site na ọrụ PHP mysqli_fetch_array().
ihe atụ
Nwaa ọmụmaatụ na-esote, a na-eweghachite data a jụrụ n'usoro n'usoro nrịdata nke ubi submission_date.
MySQL ORDER site n'ule:
<?
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/ ) kekọrịtara "MySQL multi-field conditional sorting? MySQL order site na mgbada na ịrịgo nkwupụta/ọrụ ajụjụ", nke na-enyere gị aka.
Nnọọ ka ị kesaa njikọ nke akụkọ a:https://www.chenweiliang.com/cwl-476.html