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MySQLUkuhlunga okunemibandela yezinkundla eziningi?MySQL oda ngokwehla nokunyuka kwesitatimende/umsebenzi wombuzo
Uhlobo lwe-MySQL
Siyazi ukusebenzisa isitatimende se-SQL KHETHA ukufunda idatha kusuka kuthebula le-MySQL.
Uma sidinga ukuhlunga idatha efundiwe, singasebenzisa i-MySQL's UKUHLELWA NGU isigatshana sokusetha ukuthi iyiphi inkambu ofuna ukuyihlela ngayiphi indlela, bese ubuyisela imiphumela yosesho.
uhlelo lolimi
Okulandelayo yisitatimende se-SQL KHETHA esisebenzisa i-ORDER BY clause ukuhlunga idatha yombuzo ngaphambi kokubuyisela idatha:
SELECT field1, field2,...fieldN table_name1, table_name2... ORDER BY field1, [field2...] [ASC [DESC]]
- Ungasebenzisa noma iyiphi inkambu njengesimo sokuhlunga ukuze ubuyisele imiphumela yemibuzo ehlungiwe.
- Ungasetha izinkambu eziningi ukuze uzihlunge.
- Ungasebenzisa amagama angukhiye e-ASC noma e-DESC ukuze usethe imiphumela yombuzo ukuze ihlungwe ngendlela ekhuphukayo noma eyehlayo.Ngokuzenzakalelayo, ingohlelo olukhuphukayo.
- Ungengeza LAPHO...FANA nezigatshana ukuze ubeke imibandela.
Ukusebenzisa isigatshana esithi ORDER BY kumyalo womyalo
Okulandelayo kuzosebenzisa isigatshana esithi ORDER BY esitatimendeni esithi KHETHA ukuze ufunde idatha kuthebula ledatha le-MySQL chenweiliang_tbl:
Isibonelo
Zama izibonelo ezingezansi futhi imiphumela izohlungwa ngohlelo olukhuphukayo nolwehlayo.
Uhlobo lwe-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)
Funda yonke idatha kuthebula le-chenweiliang_tbl futhi uhlunge ngohlelo olukhuphukayo ngenkambu yedethi_yokuhambisa.
Ukusebenzisa isigatshana esithi ORDER BY kusikripthi se-PHP
Ungasebenzisa umsebenzi we-PHP mysqli_query() kanye nomyalo ofanayo we-SQL KHETHA ngesigatshana esithi ORDER BY ukuze uthole idatha.
Lo msebenzi usetshenziselwa ukukhipha imiyalo ye-SQL bese ukhipha yonke idatha ebuziwe ngomsebenzi we-PHP mysqli_fetch_array().
Isibonelo
Zama isibonelo esilandelayo, idatha ebuziwe ibuyiselwa ngohlelo olwehlayo lwenkambu yedethi yokuthumela.
I-MySQL ORDER NGOKUHLOLA:
<?
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);
?>I-Hope Chen Weiliang Blog ( https://www.chenweiliang.com/ ) kwabelwane ngokuthi "Ukuhlunga okunemibandela kwezinkundla eziningi ze-MySQL? Oda i-MySQL ngokwehla nokwenyuka kwesitatimende/umsebenzi wombuzo", okuwusizo kuwe.
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