php实现搜索功能

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//一个简单的搜索
//我是将搜索语句加到最开始的查询语句里面；从而实现了代码的精简
//$news_sql = "SELECT * from books where 1=1 ".$searchAddSql." order by book_number ";// $searchAddSql最开始是为空的，如果用户输入了搜索条件，$searchAddSql
就会变成一个包涵查询语句的字符串：
//先判定用户是否输入了搜索条件
if(isset($_GET["searchText"]))
{
$searchText = $_GET["searchText"];
$searchAddSql = $searchAddSql." and (book_number like '%".$searchText."%'
or book_name like '%".$searchText."%'
or book_sum like '%".$searchText."%'
or book_author like '%".$searchText."%')";
}
//最开始的
$news_sql = "SELECT * from books where 1=1 ".$searchAddSql." order by book_number ";就会变成
$news_sql="SELECT * from books where 1=1 and (book_number like '%中%'
or book_name like '%中%'
or book_sum like '%中%'
or book_author like '%中%' ) order by book_number"；
//相当于重置了查询语句，从而达到搜索的目地

<pre name="code" class="php">

<img src="http://img.blog.csdn.net/20160519171047290?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

<img src="http://img.blog.csdn.net/20160519172048919?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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