MySQL: Test connection with query?

Use any of the predefined functions with a select query, or you can use a select query to print some words to test the connection with the query.

The syntax is as follows.

SELECT yourValue;

The selection query for predefined functions is as follows.

The syntax is as follows.

SELECT anyPredefinedFunctionName();

Now you can implement the above syntax to test the connection with the query.

Case 1- The query is as follows.

mysql> select "This is MySQL" as Display;

The following is the output.

+---------------+ | Display | +---------------+ | This is MySQL | +---------------+ 1 row in set (0.00 sec)

Case 2- The query is as follows.

mysql> select 10*3 as MultiplicationResult;

The following is the output

+---------------------+ | MultiplicationResult| +---------------------+ | 30 | +---------------------+ c1 row in set (0.00 sec)

Here is the select query to know the connection ID of the predefined function.

Case 1 -The query is as follows

mysql> select connection_id() as ConnectionId;

The following is the output

+--------------+ | ConnectionId | +--------------+ | 8 | +--------------+ 1 row in set (0.00 sec)

Case 2- Here is the predefined function database( ), used to know the current database name.

The query is as follows

mysql> select database();

The following is the output

+------------+ | database() | +------------+ | sample | +------------+ 1 row in set (0.00 sec)

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