How to Execute Multiple MySQL Queries Consecutively in PHP?

Consecutive MySQL Queries Execution in PHP

In PHP programming, it is possible to execute multiple MySQL queries consecutively. However, some users have encountered syntax errors when attempting to do so. This article aims to provide guidance on resolving such issues and using appropriate methods for multi-query execution.

One common approach to running multiple queries is to use a semicolon (;) as a separator between each query. For instance, in the provided PHP code snippet, the $sql variable concatenates three MySQL statements: creating a temporary table, updating a row within the temporary table, and inserting data from the temporary table into the main table.

However, MySQL requires a new query execution call for each separate statement. Therefore, executing the concatenated $sql variable with $conn->query($sql) would result in a syntax error.

To rectify the issue, it is recommended to prepare and execute each query individually, as demonstrated in the improved code snippet provided in the answer:

$queries = [
  "CREATE TEMPORARY TABLE tmp SELECT * FROM event_categoriesBU WHERE id = 1",
  "UPDATE tmp SET>

This approach separates each query into its own statement and allows for proper execution. It is important to note that the multi_query function does not support placeholder values, exposing the application to potential SQL injection vulnerabilities.

For enhanced flexibility and adaptability, consider using PDO (PHP Data Objects) instead of MySQLi. PDO offers more robust features, including support for placeholder values and improved security against SQL injection.

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