isopen

Determine if Apache Cassandra database connection is open

The isopen function will be removed in a future release. Use the isopen function of the Apache Cassandra^® Database C++ interface instead.

Syntax

val = isopen(conn)

Description

val = isopen(conn) returns 1 if the Cassandra database connection is open and 0 if it is closed.

Examples

Verify Cassandra Connection

Using a Cassandra® database connection, verify that the connection is open. Display the keyspaces in the Cassandra database, and then close the connection.

Create a Cassandra database connection using the local host address. conn is a cassandra object.

contactPoints = "localhost";
conn = cassandra(contactPoints);

Verify that the Cassandra database connection is open.

val = isopen(conn)

val = logical
   1

The database connection is open because the isopen function returns 1. Otherwise, the database connection is closed.

Display the keyspaces in the Cassandra database.

conn.Keyspaces

ans = 1×6 string array
    "employeedata"    "system"    "system_auth"    "system_distributed"    "system_schema"    "system_traces"

Close the Cassandra database connection.

close(conn)

Verify that the Cassandra database connection is closed.

val = isopen(conn)

val = logical
   0

Input Arguments

conn — Cassandra database connection

cassandra object

Cassandra database connection, specified as a cassandra object.

Version History

Introduced in R2018b