Php 使用LIKE和通配符搜索数据库

我有四个搜索字段，用于在数据库中搜索图书id:s，然后返回结果。根据您选择从sql查询中搜索的wich字段，您可以在下面的代码中看到。标题和isbn字段工作正常，但当我尝试使用author或category字段时，没有返回任何内容。下面还可以看到相关的数据库表。也许我使用sql函数的方式有问题，比如

数据库：

CREATE TABLE IF NOT EXISTS `bok` (
  `bokId` int(11) NOT NULL AUTO_INCREMENT,
  `bokTitel` varchar(100) DEFAULT NULL,
  `upplaga` varchar(100) DEFAULT NULL,
  `ISBN` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`bokId`)
)

CREATE TABLE IF NOT EXISTS `skrivenav` (
  `bokId` int(11) DEFAULT NULL,
  `fId` smallint(6) DEFAULT NULL
) 

CREATE TABLE IF NOT EXISTS `forfattare` (
  `fId` smallint(6) NOT NULL,
  `fNamn` varchar(80) DEFAULT NULL,
  PRIMARY KEY (`fId`)
) 

CREATE TABLE IF NOT EXISTS `bokkat` (
  `bokId` int(11) DEFAULT NULL,
  `katId` smallint(6) DEFAULT NULL
) 

CREATE TABLE IF NOT EXISTS `kategori` (
  `katId` smallint(6) NOT NULL,
  `katNamn` varchar(80) DEFAULT NULL,
  PRIMARY KEY (`katId`)
) 

<?php    
$q = "SELECT DISTINCT bokId FROM ";
if($_GET['search_title']!=""||$_GET['search_ISBN']!=""){
    $q = $q."(SELECT * FROM bok WHERE ";
    if($_GET['search_title']!="")   
        $q = $q."bokTitel LIKE '%$_GET[search_title]%' ";
    if($_GET['search_title']!="" && $_GET['search_ISBN']!="")
        $q = $q."AND ";
    if($_GET['search_ISBN']!="")    
        $q = $q."ISBN LIKE '%$_GET[search_ISBN]%' ";
    $q = $q.") AS F";
}
else $q = $q."bok";                         
if($_GET['search_author']!=""){
    $author = explode(",", $_GET['search_author']);
    $auth = "";
    foreach ($author as $value){
        $auth = $auth . "%" . $value . "%', '";
    }
    $auth = trim($auth, ", '"); 
    $q = $q." NATURAL JOIN (SELECT * FROM skrivenav NATURAL JOIN forfattare WHERE fNamn LIKE ('$auth')) AS S ";
}
if($_GET['search_category']!="") {
    $category = explode(",", $_GET['search_category']);
    $cat = "'";
    foreach ($category as $value){
        $cat = $cat . "%" . $value . "%', '";
    }
    $cat = trim($cat, ", '");
    $q = $q." NATURAL JOIN (SELECT * FROM bokkat NATURAL JOIN kategori WHERE katNamn LIKE ('$cat')) AS K ";
}
$rs = mysql_query($q);
confirm_query($rs);    
while($row = mysql_fetch_row($rs)){
    echo $row[0]."<br />";
}
?>

PHP代码：

CREATE TABLE IF NOT EXISTS `bok` (
  `bokId` int(11) NOT NULL AUTO_INCREMENT,
  `bokTitel` varchar(100) DEFAULT NULL,
  `upplaga` varchar(100) DEFAULT NULL,
  `ISBN` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`bokId`)
)

CREATE TABLE IF NOT EXISTS `skrivenav` (
  `bokId` int(11) DEFAULT NULL,
  `fId` smallint(6) DEFAULT NULL
) 

CREATE TABLE IF NOT EXISTS `forfattare` (
  `fId` smallint(6) NOT NULL,
  `fNamn` varchar(80) DEFAULT NULL,
  PRIMARY KEY (`fId`)
) 

CREATE TABLE IF NOT EXISTS `bokkat` (
  `bokId` int(11) DEFAULT NULL,
  `katId` smallint(6) DEFAULT NULL
) 

CREATE TABLE IF NOT EXISTS `kategori` (
  `katId` smallint(6) NOT NULL,
  `katNamn` varchar(80) DEFAULT NULL,
  PRIMARY KEY (`katId`)
) 

<?php    
$q = "SELECT DISTINCT bokId FROM ";
if($_GET['search_title']!=""||$_GET['search_ISBN']!=""){
    $q = $q."(SELECT * FROM bok WHERE ";
    if($_GET['search_title']!="")   
        $q = $q."bokTitel LIKE '%$_GET[search_title]%' ";
    if($_GET['search_title']!="" && $_GET['search_ISBN']!="")
        $q = $q."AND ";
    if($_GET['search_ISBN']!="")    
        $q = $q."ISBN LIKE '%$_GET[search_ISBN]%' ";
    $q = $q.") AS F";
}
else $q = $q."bok";                         
if($_GET['search_author']!=""){
    $author = explode(",", $_GET['search_author']);
    $auth = "";
    foreach ($author as $value){
        $auth = $auth . "%" . $value . "%', '";
    }
    $auth = trim($auth, ", '"); 
    $q = $q." NATURAL JOIN (SELECT * FROM skrivenav NATURAL JOIN forfattare WHERE fNamn LIKE ('$auth')) AS S ";
}
if($_GET['search_category']!="") {
    $category = explode(",", $_GET['search_category']);
    $cat = "'";
    foreach ($category as $value){
        $cat = $cat . "%" . $value . "%', '";
    }
    $cat = trim($cat, ", '");
    $q = $q." NATURAL JOIN (SELECT * FROM bokkat NATURAL JOIN kategori WHERE katNamn LIKE ('$cat')) AS K ";
}
$rs = mysql_query($q);
confirm_query($rs);    
while($row = mysql_fetch_row($rs)){
    echo $row[0]."<br />";
}
?>

---

}我认为这段代码：

foreach ($author as $value){

    $auth = $auth . "%" . $value . "%', '";

}
$auth = trim($auth, ", '"); 

$q = $q." NATURAL JOIN (SELECT * FROM skrivenav NATURAL JOIN forfattare WHERE fNamn LIKE ('$auth')) AS S ";

仅当您按照写入的确切顺序作为真实作者的值子集传递时，才会返回结果。因此，此查询不会检查乱码作者的姓名

类别也是如此

---

您应该在where子句中为过滤器中的每个类别或作者添加一个“或”，并为每个类别或作者分别创建一个表达式。

我认为这段代码：

foreach ($author as $value){

    $auth = $auth . "%" . $value . "%', '";

}
$auth = trim($auth, ", '"); 

$q = $q." NATURAL JOIN (SELECT * FROM skrivenav NATURAL JOIN forfattare WHERE fNamn LIKE ('$auth')) AS S ";

仅当您按照写入的确切顺序作为真实作者的值子集传递时，才会返回结果。因此，此查询不会检查乱码作者的姓名

类别也是如此

---

您应该在where子句中为过滤器中的每个类别或作者添加一个“or”，并为每个类别或作者创建一个单独的表达式。

请发布生成的导致错误结果的查询。这将使帮助变得更容易。请发布导致错误结果的生成查询。这将使帮助变得容易得多。