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SQL LIKE Pattern match by REGEXP Locate Query

SQL for keyword Search

Search options are common in web pages and we can give option to visitors to search for keywords to locate the article or data within a site. Here we will apply the search to an existing table. The visitors will enter one or more than one keywords in the search box and we have to develop a query based on the selection of the visitor. Here we will discuss how to create a sql query to apply to the database with multiple keywords. Basically we will focus on construction of sql using keywords and will not go into details of getting the result or displaying in proper format with page breaks.

Here we will give the option to the visitor to search for exact match or any where match on the table. For this we will use our student table and apply the search to the name field of the MySQL table. Based on the selected type of search we will generate the sql. Here are the steps required to develop a keyword search.

Demo of Keyword Search

Once the form is submitted check if the visitor has asked for exact match or any where match using if condition. Before that we will remove the blank space from left and right of the search sting by using ltrim and rtrim functions.
$search_text=ltrim($search_text);
$search_text=rtrim($search_text);
If the visitor has asked for exact match then create the query using simple where condition. Else ..

If the visitor has asked for any where matching of keywords then read the search term and break it into array of keywords using split command. Then loop through all the element of the array of words and create the sql command using like command for each word or the element of the array. Here is the code for this.
$kt=split(" ",$search_text);//Breaking the string to array of words
// Now let us generate the sql 
			while(list($key,$val)=each($kt)){
if($val<>" " and strlen($val) > 0){$q .= " name like '%$val%' or ";}

			}// end of while
You can see we have broken the search text using split command and then looped through the keywords. Here using one if condition we have taken care that blank space are removed in formatting the sql string.
This way we will be adding one sql like command with OR combination for each word used.

We will be adding each like command to the string with an SQL OR command. This way we will end with an extra OR command. This extra OR command we can remove from the end by using substr and strlen string functions.
$q=substr($q,0,(strlen($q)-3));
In the above line we have first calculated the length of the string by using strlen and then used that value inside the substr function after subtracting 3 from it. The 3 is subtracted as length of OR with one blank space is 3. This way we will get the string after removing 3 chars from the end. ( that is extra OR with a blank space )

Once this sql is formatted then we can print it to the screen to check the syntax of the sql to match our requirement. Beyond this point you can use any server side script to collect the results from the table. You can read the tutorial on how to display data from mysql using php. You can down load the PHP version of this tutorial in a zip file at the end of this page. Here is the code till now.

<?Php
//ini_set('display_errors', true);//Set this display to display all erros while testing and developing the script
error_reporting(0);// With this no error reporting will be there
include "include/z_db.php";


$todo=$_POST['todo'];
$search_text=$_POST['search_text'];

if(strlen($serch_text) > 0){
if(!ctype_alnum($search_text)){
echo "Data Error";
exit;
}
}
////////// Displaying the search box /////
echo "<table>
<tr><td colspan=2 align='center'>";

echo "<form method=post action=''><input type=hidden name=todo value=search>
<input type=text name=search_text value='$search_text'><input type=submit value=Search><br>
<input type=radio name=type value=any checked>Match any where
<input type=radio name=type value=exact>Exact Match

</form>
";

echo "</td></tr>";

/////////// if form is submitted the data processing is done here///////////////
echo "<tr><td width='600' valign=top>";

if(isset($todo) and $todo=="search"){

$type=$_POST['type'];

$search_text=ltrim($search_text);
$search_text=rtrim($search_text);

if($type<>"any"){
$query="select * from student where name='$search_text'";
}else{
$kt=split(" ",$search_text);//Breaking the string to array of words
// Now let us generate the sql
while(list($key,$val)=each($kt)){
if($val<>" " and strlen($val) > 0){$q .= " name like '%$val%' or ";}

}// end of while
$q=substr($q,0,(strLen($q)-3));
// this will remove the last or from the string.
$query="select * from student where $q ";
} // end of if else based on type value
echo "<span style='background-color= #FFFF00'>$query</span><br>";
$count=$dbo->prepare($query);
$count->execute();
$no=$count->rowCount();
if($no > 0 ){echo " No of records = ".$no."<br><br>";
echo "<table><tr><th>ID</th><th>Name</th><th>Class</th><th>Mark</th><th>Sex</th></tr>";
foreach ($dbo->query($query) as $row){
echo "<tr><td>$row[id]</td><td>$row[name]</td><td>$row[class]</td>
<td>$row[mark]</td><td>$row[sex]</td></tr>";
}
echo "</table>";
}else {
echo " No records found ";
}

}// End if form submitted
echo "</td><td width='400' valign=top>";
echo " Full records here ";
$query="select * from student";


echo "<table><tr><th>ID</th><th>Name</th><th>Class</th><th>Mark</th><th>Sex</th></tr>";
foreach ($dbo->query($query) as $row){
echo "<tr><td>$row[id]</td><td>$row[name]</td><td>$row[class]</td>
<td>$row[mark]</td><td>$row[sex]</td></tr>";
}
echo "</table>";

echo "</td></tr></table>";
?>


Generate SQL based on user inputs for searching a table

Ajax based Keyword search on MySQL table

download Keyword search script

Number of User Comments : 20


Google+

P Biggs13-02-2009
Thanks for your code on search-keyword.php. I've extended it to include an 'all' type for the search which is probably the most useful of the three, that returns results if all keywords are found in a record. If you want to use it or any part you're most welcome. It's on my site (see email address) in the miscellaneous section.
Ragz10-03-2009
Thanks for the code.. it saved my academic life
A Marie14-04-2009
Where do you put the "all" to search all tables?
A Marie15-04-2009
When I do a search the search string also shows up.. how do I hide this without damaging the code?
smo15-04-2009
There is a line saying echo $query; Remove this line or comment it like this //echo $query; This line is kept so before integrating the developer can know what is going to come
ramesh dudala23-07-2009
hai this is code is easly and good so thank u
chris02-08-2009
This is Great lesson. I was wondering also how I could add a message in case the return is false?
Hugh21-08-2009
Where do I put the connect??
sangi08-12-2009
hey this is really good thanks dude
Pranjal14-01-2010
how do i display the data which is not found?
glaize17-01-2010
tnx plus2net!i have learned a lot.
Lashan07-02-2010
Excellent tutorial. Explained very clearly. All the best and keep it up.
Lashan Jayawardhana13-02-2010
Excellent code plus2net. It is very useful. Fantastic work and great explanation. Keep up the good work. All the best !!!
Thajul Hussain02-03-2010
its very usefull, working fine. thanks a lot.........
Mangal08-04-2010
thanks for sharing this script.
sunil11-04-2010
how to match mysql database table vlaue whose given by user in php text..
spencalot14-04-2010
This is a great search engine. Thanks. my SQL table contains a field with key words such as: "apples fruits john doe car keys John Smith" How can I make the search engine search for "John Doe"? thanks!
smo15-04-2010
As your query has two words John
Om Bahadur kc14-08-2012
How to search from 2 or more table by one query without join Query,..
anil14-09-2012
hello dude its superv query...that u used...it realy works....realy thanks
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