Pehea e nīnau ai i ka MySQL like? Ka hoʻohana ʻana i ka ʻōlelo like ma ka waihona MySQL

mysql Pehea e ninau like ai?waihona waihona mysqlʻO ka hoʻohana ʻana i ka ʻōlelo e like me Kina

MySQL LIKE pauku

ʻIke mākou e hoʻohana i ke kauoha SQL SELECT e heluhelu i ka ʻikepili ma MySQL, a hiki iā mākou ke hoʻohana i ka paukū WHERE i ka ʻōlelo SELECT e kiʻi i nā moʻolelo i kuhikuhi ʻia.

Hiki ke hoʻohana ʻia ka hōʻailona like ma ka māhele WHERE = E hoʻonohonoho i nā kūlana no ka loaʻa ʻana o ka ʻikepili, e like me "chenweiliang_author = 'chenweiliang.com'".

Akā i kekahi manawa pono mākou e kiʻi i nā moʻolelo āpau nona ka chenweiliang_author kahua i loaʻa i nā huaʻōlelo "COM", a laila pono mākou e hoʻohana i ka pauku SQL LIKE ma ka māhele WHERE.

Ke hoʻohana nei i nā hōʻailona pākēneka ma nā māhele SQL LIKE %ʻano e hōʻike i kekahi ʻano, e like me ka asterisk ma UNIX a i ʻole nā ​​​​hōʻike maʻamau *.

Inā ʻaʻole hoʻohana ʻia ka hōʻailona pakeneka %, LIKE pauku me ka hoailona like = Ua like ka hopena.

ʻōlelo ʻōlelo

ʻO kēia ka syntax maʻamau o kahi ʻōlelo SQL SELECT e heluhelu i ka ʻikepili mai kahi papa ʻikepili me ka hoʻohana ʻana i ka paukū LIKE:

SELECT field1, field2,...fieldN 
FROM table_name
WHERE field1 LIKE condition1 [AND [OR]] filed2 = 'somevalue'

• Hiki iā ʻoe ke kuhikuhi i kekahi kūlana ma ka māhele WHERE.
• Hiki iā ʻoe ke hoʻohana i ka paukū LIKE ma ka paukū WHERE.
• Hiki iā ʻoe ke hoʻohana i ka paukū LIKE ma kahi o ka hōʻailona like =.
• LIKE LIKE LIKE LIKE % Hoʻohana pū ʻia, e like me kahi hulina metacharacter.
• Hiki iā ʻoe ke kuhikuhi i hoʻokahi a ʻoi aku paha nā kūlana me ka hoʻohana ʻana i ka AND a i ʻole OR.
• Hiki iā ʻoe ke hoʻohana i ka paukū WHERE...LIKE i nā kauoha DELETE a i ʻole UPDATE e kuhikuhi i nā kūlana.

Ke hoʻohana nei i ka pauku LIKE ma ke kauoha kauoha

Ma lalo nei e hoʻohana mākou i ka māhele WHERE...LIKE ma ke kauoha SQL SELECT e heluhelu i ka ʻikepili mai ka papa ʻikepili MySQL chenweiliang_tbl.

laʻana

Eia ka pehea e loaʻa ai iā mākou ke kahua chenweiliang_author ma ka papa chenweiliang_tbl me mail no nā moʻolelo a pau e pau ana me:

mysql> use chenweiliang;
Database changed
mysql> SELECT * from chenweiliang_tbl WHERE chenweiliang_author LIKE '%COM';
+-----------+---------------+---------------+-----------------+
| 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 |
+-----------+---------------+---------------+-----------------+
2 rows in set (0.01 sec)

Ke hoʻohana nei i ka paukū LIKE ma ka palapala PHP

Hiki iā ʻoe ke hoʻohana i ka hana PHP mysqli_query() a me ke kauoha SQL SELECT like me kahi māhele WHERE...LIKE e kiʻi i ka ʻikepili.

Hoʻohana ʻia kēia hana e hoʻokō i nā kauoha SQL a laila hoʻopuka i ka ʻikepili no nā nīnau āpau ma o ka hana PHP mysqli_fetch_assoc().

Akā inā he ʻōlelo SQL ia e hoʻohana ana i ka paukū WHERE...LIKE ma DELETE a i ʻole UPDATE, ʻaʻohe pono e hoʻohana i ka hana mysqli_fetch_array ().

laʻana

Eia ke ʻano o kā mākou hoʻohana ʻana i ka palapala PHP no ka heluhelu ʻana i nā moʻolelo a pau e pau ana ma COM ma ke kahua chenweiliang_author ma ka papa chenweiliang_tbl:

<?
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
 WHERE chenweiliang_author LIKE "%COM"';
 
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 mysqli_fetch_array 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);
?>