How can I access MySQL queries and prepared statements within class instances using PDO?

Incorporation of PDO in Classes

The objective is to incorporate the PDO object within classes, allowing access to MySQL queries and prepared statements within class instances. However, attempting to instantiate the PDO object as a class property, as shown in the provided example, fails.

Singleton Pattern Solution

To address this issue, leveraging the singleton pattern is recommended. The singleton pattern ensures that only one instance of a class exists, providing a central point of access to a shared resource.

Implementation

In the provided solution, a class named Core implements the singleton pattern and establishes the database connection. The class includes the following structure:

• dbh property: Holds the database connection handle.
• getInstance() method: Ensures there is only one instance of the Core class.
• Configuration loading: Reads database configuration from a static class called Config.

Example Usage

Within other class instances or scripts, the following steps can be taken to utilize the database connection:

1. Retrieve the Core instance using Core::getInstance().
2. Prepare queries using the prepare() method of the retrieved instance's dbh property.
3. Execute queries using the execute() method, bind parameters if necessary.
4. Access the query results using the fetch() method.

Benefits of Singleton Pattern

• Centralized database access: Provides a consistent interface for querying the database across classes.
• Singularity: Guarantees only one database connection, ensuring efficient resource utilization.
• Flexibility: Enables easy configuration changes by modifying the Config class.

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