如何無異常地檢查MySQL中的表是否存在？

How to Determine Table Existence in MySQL without Exceptions

Checking if a table exists in MySQL without triggering exceptions can be crucial for handling data-driven applications. This inquiry focuses on finding a solution that avoids the time-consuming task of parsing "SHOW TABLES LIKE" results.

The Optimal Solution: Querying via Information Schema

The most dependable and secure method for ascertaining table existence involves querying the information_schema database using a prepared statement. This approach eliminates the need for exception handling:

<?php

$sql = "SELECT 1 FROM information_schema.tables 
        WHERE table_schema = database() AND table_name = ?";
$stmt =  $pdo->prepare($sql);
$stmt->execute([$tableName]);
$exists = (bool)$stmt->fetchColumn();

?>

Explanation:

1. Database(): This function retrieves the current database schema in use.
2. **Execute([$tableName])**: The parameterized query is executed, where $tableName represents the table whose existence is being verified.
3. fetchColumn(): Extracts the result as a single column, which in this case will be either 1 (for table existence) or NULL (for table non-existence).

Benefits of this Approach:

• Efficient and accurate table existence verification
• Secure against SQL injection attacks
• Avoids the need for exception handling
• Handles multi-tenant and database selection scenarios

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