PL/SQL is a procedural language used in Oracle databases, and it does not have built-in support for connecting to MongoDB. However, you can use Oracle Database Gateway for MongoDB to establish a connection between Oracle Database and MongoDB.

To connect Oracle Database with MongoDB using the Oracle Database Gateway for MongoDB, follow these steps:

1. Install the Oracle Database Gateway for MongoDB on the Oracle Database server.
2. Configure the Oracle Database Gateway for MongoDB by creating a database link.
3. Use the created database link in PL/SQL code to access MongoDB data.

Here is an example of accessing MongoDB data in PL/SQL using the Oracle Database Gateway for MongoDB:

1. Install and configure the Oracle Database Gateway for MongoDB according to the documentation provided by Oracle.

2. Create a database link to MongoDB using the following SQL statement:

   CREATE DATABASE LINK <db_link_name>
   CONNECT TO <mongodb_username>
   IDENTIFIED BY <mongodb_password>
   USING 'MONGO_DB';
   

   Replace <db_link_name> with the name of the database link, <mongodb_username> with the username for MongoDB, <mongodb_password> with the password for MongoDB, and 'MONGO_DB' with the name of the configured Oracle Database Gateway for MongoDB.

3. Use the created database link in PL/SQL code to access MongoDB data. For example:

   DECLARE
     v_name VARCHAR2(100);
   BEGIN
     SELECT name INTO v_name FROM <mongodb_collection>@<db_link_name> WHERE id = 1;
     DBMS_OUTPUT.PUT_LINE('Name: ' || v_name);
   END;
   

   Replace <mongodb_collection> with the name of the MongoDB collection you want to access and <db_link_name> with the name of the created database link.

Note: The Oracle Database Gateway for MongoDB is a separate product provided by Oracle and may require a separate license. Make sure to review the licensing requirements and consult the official Oracle documentation for detailed instructions on installation and configuration.