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Memcached add command is used to set a value to a new key. If the key already exists, then it gives the output NOT_STORED.
Syntax
The basic syntax of Memcached add command is as shown below −
add key flags exptime bytes [noreply] value
The keywords in the syntax are as described below −
-
key − It is the name of the key by which data is stored and retrieved from Memcached.
-
flags − It is the 32-bit unsigned integer that the server stores with the data provided
by the user, and returns along with the data when the item is retrieved. -
exptime − It is the expiration time in seconds. 0 means no delay. If exptime is more
than 30 days, Memcached uses it as a UNIX timestamp for expiration. -
bytes − It is the number of bytes in the data block that needs to be stored. This is the
length of the data that needs to be stored in Memcached. -
noreply (optional) − It is a parameter that informs the server not to send any reply.
-
value − It is the data that needs to be stored. The data needs to be passed on the new line after executing the command with the above options.
Output
The output of the command is as shown below −
STORED
-
STORED indicates success.
-
NOT_STORED indicates the data is not stored in Memcached.
Example
In the following example, we use ‘key’ as the key and add the value Memcached in it with an expiration time of 900 seconds.
add key 0 900 9 memcached STORED get key VALUE key 0 9 Memcached END
Failure Output
add key 0 900 5 redis NOT_STORED
Add Data Using Java Application
To add data in a Memcached server, you need to use the Memcached add method.
Example
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
// Connecting to Memcached server on localhost
MemcachedClient mcc = new MemcachedClient(new
InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server successful");
System.out.println("add status:"+mcc.add("tutorialspoint", 900, "redis").done);
System.out.println("add status:"+mcc.add("tp", 900, "redis").done);
// Get value from cache
System.out.println("Get from Cache tp:"+mcc.get("tp"));
}
}
Output
On compiling and executing the program, you get to see the following output −
Connection to server successful add status:false add status:true Get from Cache tp:redis
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