Mysql LENGTH() function ~ Tech Blog

Tuesday 10 July 2018

Mysql LENGTH() function

Mysql LENGTH()

MySQL LENGTH() returns the length of a given string.

Syntax:

LENGTH (str)

Argument

Name	Description
str	A string whose length is to be returned.

MySQL Version: 5.6

Example of MySQL LENGTH() function

The following MySQL statement returns the pub_name and length of pub_name from publisher table.

Code:

SELECT pub_name,LENGTH(pub_name) FROM publisher;



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Sample table: publisher

Sample Output:

mysql> SELECT pub_name,LENGTH(pub_name) FROM publisher;
+------------------------------+------------------+
| pub_name                     | LENGTH(pub_name) |
+------------------------------+------------------+
| Jex Max Publication          |               19 | 
| BPP Publication              |               15 | 
| New Harrold Publication      |               23 | 
| Ultra Press Inc.             |               16 | 
| Mountain Publication         |               20 | 
| Summer Night Publication     |               24 | 
| Pieterson Grp. of Publishers |               28 | 
| Novel Publisher Ltd.         |               20 | 
+------------------------------+------------------+
8 rows in set (0.03 sec)

PHP script

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example-length-function - php mysql examples | w3resource</title>
<meta name="description" content="example-length-function - php mysql examples | w3resource"><link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>list of publishers name and length of their name:</h2>
<table class='table table-bordered'>
<tr>
<th>Publishers name</th><th>Length of Publishers name</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT pub_name,LENGTH(pub_name)
FROM publisher') as $row) {
echo "<tr>";
echo "<td>" . $row['pub_name'] . "</td>";
echo "<td>" . $row['LENGTH(pub_name)'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>



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JSP script

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>example-length-function</title>
</head>
<body>
<%
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
String Host = "jdbc:mysql://localhost:3306/w3resour_bookinfo";
Connection connection = null;
Statement statement = null;
ResultSet rs = null;
connection = DriverManager.getConnection(Host, "root", "datasoft123");
statement = connection.createStatement();
String Data ="SELECT pub_name,LENGTH(pub_name) FROM publisher";
rs = statement.executeQuery(Data);
%>
<TABLE border="1">
<tr width="10" bgcolor="#9979">
<td>Publishers name</td>
<td>Length of Publishers name</td>
</tr>
<%
while (rs.next()) {
%>
<TR>
<TD><%=rs.getString("pub_name")%></TD>
<TD><%=rs.getString("LENGTH(pub_name)")%></TD>
</TR>
<%   }    %>
</table>
<%
rs.close();
statement.close();
connection.close();
} catch (Exception ex) {
out.println("Cant connect to database.");
}
%>
</body>
</html>



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Example of MySQL LENGTH() function with where clause

The following MySQL statement returns the pub_name and length of pub_name from publisher table who have the length of there is more than or equal to 20.

Code:

SELECT pub_name,LENGTH(pub_name) FROM publisher WHERE LENGTH(pub_name)>=20;



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Sample table: publisher

Sample Output:

mysql> SELECT pub_name,LENGTH(pub_name) FROM publisher
    -> WHERE LENGTH(pub_name)>=20;
+------------------------------+------------------+
| pub_name                     | LENGTH(pub_name) |
+------------------------------+------------------+
| New Harrold Publication      |               23 | 
| Mountain Publication         |               20 | 
| Summer Night Publication     |               24 | 
| Pieterson Grp. of Publishers |               28 | 
| Novel Publisher Ltd.         |               20 | 
+------------------------------+------------------+
5 rows in set (0.03 sec)

Tech Blog

Tuesday 10 July 2018