How Can I Debug Failed MySQL Queries in My CodeIgniter Model?

Trouble with MySQL Query in CodeIgniter Model

You've encountered an issue with executing a SQL statement in your CodeIgniter model. Despite satisfying the query builder, your query consistently fails. To troubleshoot the problem, you want to display the exact SQL statement sent to the database.

Solution: Retrieving the Last Query

CodeIgniter provides a method, $this->db->last_query(), that retrieves the last SQL statement that was executed. You can utilize this method to display the query statement on your PHP view page. Here's how:

<?php
// Your model code

$query = $this->db->query($sql, array(fields, fields1);

if ($query) {
    return true;
} else {
    echo "<br>The query failed:<br>";
    echo "<b>SQL Statement: </b>" . $this->db->last_query();
    return false;
}
?>

Result:

When this code runs, if the query fails, the exact SQL statement that was sent to the database will be displayed in your view page. This information helps you identify potential syntax errors, table references, or data inconsistencies.

Additional Information:

The $this->db->last_query() method is a helpful troubleshooting tool for database queries in CodeIgniter. It provides immediate insights into the SQL statements executed during the model's operation.

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