Quick introduction to PDO operation, have you used it today?

• Chapter1 What is PDO and what can it do?
• 1-1 What is PDO? Why should you choose PDO to operate your database?
• Chapter2 Use PDO objects to complete database operations
• 2-1 How to correctly connect to database using PDO object?
• 2-2 Tips for quickly adding data using PDO
• 2-3 Safely update data using PDO objects
• 2-4 Things to note when deleting data from PDO objects
• Chapter3 Use PDO to process query result sets
• 3-1 Use PDO's fetch() method to traverse the result set one by one
• 3-2 Tips for quickly retrieving the entire result set using fetchAll()
• 3-3 How PDO directly operates the result set (skipping parsing)
• 3-4 Use model mapping to process result sets (emphasis)
• Chapter4 Introduction to PDO preprocessing
• 4-1 [Update as an example] Quickly understand the principle and operation process of PDO preprocessing
• Chapter5 PDO course summary
• 5-1 I have learned the basics of PDO, let’s summarize it.