php mysql ajax 單表多欄位多關鍵詞查詢
阿新 • • 發佈：2018-11-10
單表多欄位查詢在一些稍微複雜一點的查詢中十分有用。本文主要利用MySQL資料庫中的concat函式實現單表多欄位多關鍵詞查詢。並且顯示查詢結果的表格可根據所選資料表動態生成。
html程式碼
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="js/jquery-1.9.1.min.js" type="text/javascript" charset queryInIndex.php
<?php
include_once("../phpFiles/connMysql.php");//包含連線資料庫的程式碼
$queryType=$_POST['queryType'];//目標資料表
$queryKeywords=$_POST['queryKeywords']; //查詢詞
$queryKeywords = preg_replace('#\s+#', ' ',$queryKeywords);//將字串中多個連續空格替換為一個空格
$keywords=explode(" ",$queryKeywords); //查詢詞按空格分割
//根據不同的資料表生成不同的查詢語句
if($queryType=="users")
{
$sqlsmt="select email,truename,enName,stuid,degree,supervisorname,tel,room from $queryType where "; //查詢語句的初始值
//利用迴圈 生成對每個關鍵詞的查詢語句
foreach ($keywords as $keyword)
{
$sqlsmt.="concat(email,truename,enName,stuid,degree,supervisorname,tel,room) like '%$keyword%' or ";//本句是關鍵，利用concat函式實現從多個欄位查詢單個關鍵詞，並用' or '關鍵詞把每個關鍵詞的concat結果合併
}
$sqlsmt=substr($sqlsmt,0,strlen($sqlsmt)-3); //去掉查詢字串尾部的' or '
$sqlsmt.=" order by degree asc, stuid desc"; //追加排序子句
}
else if($queryType=="papers")
{
$sqlsmt="select authors,title,jorc,vap,level,status from $queryType where ";
foreach ($keywords as $keyword)
{
$sqlsmt.="concat(authors,title,jorc,vap,level,status) like '%$keyword%' or ";
}
$sqlsmt=substr($sqlsmt,0,strlen($sqlsmt)-3);
$sqlsmt.=" order by level desc, vap desc";
}
else if($queryType=="softwares")
{
$sqlsmt="select authors,title,num,date from $queryType where ";
foreach ($keywords as $keyword)
{
$sqlsmt.="concat(authors,title,num,date) like '%$keyword%' or ";
}
$sqlsmt=substr($sqlsmt,0,strlen($sqlsmt)-3);
$sqlsmt.=" order by date desc";
}
else if($queryType=="patents")
{
$sqlsmt="select authors,title,acceptDate,acceptNum,authorizeDate,authorizeNum from $queryType where ";
foreach ($keywords as $keyword)
{
$sqlsmt.="concat(authors,title,acceptDate,acceptNum,authorizeDate,authorizeNum) like '%$keyword%' or ";
}
$sqlsmt=substr($sqlsmt,0,strlen($sqlsmt)-3);
$sqlsmt.=" order by acceptDate desc";
}
$myrs=mysql_query($sqlsmt);//執行查詢
if(mysql_num_rows($myrs)==0)//如果結果為空 返回'no'
{
echo(json_encode("no"));
}
else //否則返回json格式的結果
{
while($row=mysql_fetch_array($myrs))
{
$temp[]=$row;
}
echo(json_encode($temp));
}
?>結果截圖
