Why Am I Getting a 'Invalid Parameter Number' Error in Yii's Parameter Binding?

Parameter Binding Error: "Invalid Parameter Number" in Yii

This error signifies that the number of parameters in a SQL statement does not match the number of parameters bound for execution. In the provided Yii example, the issue stems from a mismatch between the parameter names used in the SQL query and those bound in the bindValue() method.

To resolve this issue, check the following:

• Parameter Names: Ensure that the parameter names in the SQL statement and the bindValue() method match exactly. In this case, the SQL query contains :alias, but the binding is for :username. Correcting this will fix the parameter number discrepancy.
• Forgotten Binding: Verify that no parameters are missed in the binding process. All parameters in the SQL query should be bound using bindValue().
• Invalid Characters: Check that parameter names do not contain invalid characters that may disrupt parameter recognition by the database engine.
• Conflicting Parameters: If using complex queries with pagination or sorting, conflicts can arise that result in missing parameters. Review the query and parameter binding logic carefully to identify and resolve any conflicts.

To aid in troubleshooting, enable parameter logging in the Yii configuration file by adding 'enableParamLogging'=>true, to the database configuration array. This will display the executed query and the parameters used during execution, providing valuable information for debugging parameter-related issues.

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