How to Debug PDO Prepared Statements in PHP?

Debugging PDO Database Queries

In PHP, PDO (PHP Data Objects) is a powerful library for interacting with databases. While it offers improved speed, security, and maintainability compared to string concatenation for SQL queries, it also presents a debugging challenge.

Problem Statement:

When using PDO prepared statements, the final query sent to the database is invisible to the programmer. This can make it difficult to debug syntax errors or identify other issues associated with the query.

Solution:

Unlike concatenated queries, there is no “final query” in PDO. The query is parsed, prepared, and variables are inserted into an internal database-driven representation.

따라서, it is not possible to capture the complete SQL query and record it to a file.

Suggestion for debugging alternative:For debugging purposes, you can restore the "real" SQL query by injecting values ​​into the private SQL string

Display the SQL code corresponding to the statement using proxies.
1. Use var_dump to display parameter values.

Although not ideal for debugging, it provides a level Reasonable visibility to detect possible errors.

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