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MySQLFa'avasega tulaga fa'a-va'aiga?MySQL fa'atonu e ala ile fa'asolo i lalo ole fa'amatalaga fesili/galuega
MySQL ituaiga
Matou te iloa e faʻaaoga le SQL SELECT faʻamatalaga e faitau ai faʻamatalaga mai le laulau MySQL.
Afai matou te manaʻomia le faʻavasegaina o faʻamaumauga faitau, e mafai ona matou faʻaogaina MySQL's Poloaʻi e Fuaiupu e seti ai le fanua e te manaʻo e faʻavasega i le auala, ona toe faʻafoʻi lea o le suʻega.
kalama
O loʻo taua i lalo se faʻamatalaga SQL SELECT e faʻaogaina le ORDER BY fuaiupu e faʻavasega ai faʻamatalaga fesili aʻo leʻi toe faʻafoʻi faʻamaumauga:
SELECT field1, field2,...fieldN table_name1, table_name2... ORDER BY field1, [field2...] [ASC [DESC]]
- E mafai ona e fa'aogaina so'o se fanua e fai ma tu'utu'uga fa'avasega e toe fa'afo'i fa'ai'uga fa'avasega.
- E mafai ona e seti ni fanua se tele e fa'avasega.
- E mafai ona e fa'aogaina le ASC po'o le DESC keywords e seti ai fa'ai'uga o fesili e fa'avasega i luga pe fa'asolo i lalo.Ona o le faaletonu, o loo i ai i le faasologa agai i luga.
- E mafai ona e fa'aopoopo WHERE...LIKE fuaiupu e seti ai tulaga.
Fa'aaogā le ORDER BY clause i le fa'atonuga
O mea nei o le a faʻaogaina le ORDER BY fuaiupu i le SQL SELECT faʻamatalaga e faitau ai faʻamatalaga i le MySQL data table chenweiliang_tbl:
Fa'ata'ita'iga
Fa'ata'ita'i fa'ata'ita'iga o lo'o i lalo ma o fa'ai'uga o le a fa'avasega i luga ma fa'asolo i lalo.
SQL fa'avasega
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)
Faitau fa'amaumauga uma ile laulau chenweiliang_tbl ma fa'avasega ile fa'asologa alu a'e ile fanua submission_date.
Fa'aaogāina o le ORDER BY clause ile PHP script
E mafai ona e faʻaogaina le PHP galuega mysqli_query() ma le SQL SELECT poloaiga tutusa ma se ORDER BY fuaiupu e maua ai faʻamatalaga.
O lenei galuega e faʻaaogaina e faʻatino ai faʻatonuga SQL ona faʻapipiʻi uma ai lea o faʻamaumauga e ala i le PHP galuega mysqli_fetch_array().
Fa'ata'ita'iga
Fa'ata'ita'i le fa'ata'ita'iga o lo'o mulimuli mai, o fa'amaumauga o lo'o fesiligia e toe fa'afo'i i lalo i le fa'asologa o le submission_date field.
MySQL ORDER BY suʻega:
<?
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/ ) fa'asoa "MySQL multi-field conditional sorting? MySQL order by down and ascending query statement/function", lea e fesoasoani ia te oe.
Fa'afeiloa'i e fa'asoa le so'otaga o lenei tusitusiga:https://www.chenweiliang.com/cwl-476.html