https://www.ibm.com/docs/en/db2/11.5.x?topic=dlm-isopen-function-test-if-large-object-is-open
ISOPEN function - Test if the large object is open
The ISOPEN function always returns an INTEGER value of 1..
function testthe largeisopenobject
https://www.mathworks.com/help/database/ug/database.mongo.connection.isopen.html
isopen - Determine if MongoDB C++ interface connection is open - MATLAB
This MATLAB function returns 1 if the MongoDB connection is open and 0 if it is closed.
isopendeterminemongodbcmatlab
https://www.mathworks.com/help/database/ug/database.mysql.connection.isopen.html
isopen - Determine if database connection is open - MATLAB
This MATLAB function returns 1 if the database connection is open and 0 if it is closed or invalid.
database connectionisopendeterminematlab