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Revealing the essence of PHP fuzzy query technology
Find relevant users based on the entered keywords
Master the application of PHP fuzzy technology
The syntax of PHP fuzzy query
PHP fuzzy query application
Database design
User table ( user):
CREATE TABLE user( `uid` int(10) AUTO_INCREMENT PRIMARY KEY COMMENT '用户ID', `username` varchar(30) NOT NULL DEFAULT '' COMMENT '用户名', `password` varchar(6) NOT NULL DEFAULT '' COMMENT '密码', `sex` char(2) NOT NULL DEFAULT '保密' COMMENT '性别', `email` varchar(40) NOT NULL DEFAULT '' COMMENT '邮箱', `hobby` varchar(255) NOT NULL DEFAULT '' COMMENT '兴趣爱好', KEY `username`(`username`)//索引 )ENGINE=MyISAM DEFAULT CHARSET=UTF8 COMMENT='用户表'
Benefits of indexing:
If you retrieve data according to a certain condition, if the condition field is not indexed, the entire table will be traversed when querying. If you create an index, the query will be based on the index, thereby improving query performance
SQL matching mode (the most commonly used one in development)
Regular expression matching Pattern
#Use SQL matching pattern, you cannot use operator = or !=, but use operator LIKE or NOT LIKE
Use SQL matching mode, MYSQL provides two wildcard characters:
①% represents any number of any characters (including 0)
② Any single character represented by _
代码实现: SELECT * FROM user WHERE username like 'l%'; SELECT * FROM user WHERE username like '%e'; SELECT * FROM user WHERE username like '%o%'; SELECT * FROM user WHERE username like '___';//三个_,表示username为三个字符的结果集 SELECT * FROM user WHERE username like '_o%';//第二个字符为oRegular expression matching pattern
. Matches any single character
* Matches 0 or more characters before it
eg:x* 表示匹配任何数量的x字符
eg:[abc] 匹配字符a、b后者c [a-z] 匹配任何字母 [0-9] 匹配任何数字 [0-9]* 匹配任何数量的任何数字 [a-z]* 匹配任何数量的任何字母
eg:^a 表示以字母a开头
eg:s$ 表示以字母s结尾
code:SELECT * FROM user WHERE username REGEXP '^l'; SELECT * FROM user WHERE username REGEXP '...';
PS: If only the . wildcard is used, there are several dot wildcards, assuming N , then the matching pattern means greater than or equal to N
^...$ //表示只能为三个字符 SELECT * FROM user WHERE username REGEXP '^...$';
Case
Source code analysis
<?php //关键字 $keywords = isset($_POST['keywords'])?$_POST['keywords']:''; //连接数据库,php7废弃了mysql_connect推荐使用 mysqli_connect$link = mysqli_connect( "localhost:3306", "root", "root", "mook"); if(!empty($keywords)){ $sql = "SELECT * FROM user WHERE username like '%{$keywords}%' "; }else{ $sql = "SELECT * FROM user"; }$usersArr = [];$result = $link->query($sql);while($row = $result->fetch_assoc()) { //简单高亮显示 // $row['username'] = str_replace($keywords, "<font color='red'>".$keywords."</font>",$row['username']); //高亮显示,不区分关键字的大小写 $usernameArr = preg_split('/(?<!^)(?!$)/u',$row['username']); foreach ($usernameArr as $key => $value) { if(strtoupper($keywords) == strtoupper($value)){ $usernameArr[$key] = "<font color='red'>".$value."</font>"; } } $row['username'] = join($usernameArr); $usersArr[] = $row; }?><!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>php用户查询器</title> </head> <body> <h1>php模糊查询</h1> <form action="index.php" method="post"> 用户名:<input type="text" name="keywords" value="" /> <input type="submit" value="提交查询" /> </form> <?php if(!empty($keywords)){ echo "查询关键词:<font color='red'> ".$keywords." </font>结果!"; } $tableString = "<table width='500' border='1' cellpadding='5'>"; $tableString .= "<tr bgcolor='orange'><th>用户名</th><th>邮箱</th><th>性别</th></tr>"; if(!empty($usersArr)){ foreach ($usersArr as $key => $value) { $tableString .= "<tr><td>" . $value['username']. "</td><td>" . $value['email'] . "</td><td>".$value['sex']."</td></tr>"; } }else{ $tableString .="<tr><td colspan='3'>没有数据</td></tr>"; } $tableString .= "</table>"; echo $tableString; ?> </body> </html>
Link :https://pan.baidu.com/s/1F8duu8G2iCa4xgNLBbiLCg Password: 96fn
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