SQLSTATE[HY093]: Invalid Parameter Number: How to Fix Yii DAO Parameter Binding Issues?

SQLSTATE[HY093]: Invalid Parameter Number: Resolving the Parameter Binding Issue

Problem Description: When attempting to execute an SQL query using Yii's DAO, the following error occurs: "SQLSTATE[HY093]: Invalid parameter number: parameter was not defined."

Solution: The error message indicates that a parameter used in the SQL statement is not present in the corresponding bindValue() method. Here are the potential causes and recommended solutions:

• Mismatched parameter names: Ensure that the parameter name used in the SQL statement exactly matches the parameter name in the bindValue() method (e.g., ":alias" in the SQL statement should be ":alias" in the bindValue() method).
• Missing bindValue() methods: Verify that bindValue() is called for each parameter used in the SQL statement.
• Invalid parameter names: Check for special characters or invalid characters in the parameter names used in the bindValue() method.
• Pagination or sorting conflicts: When using CDataProviders with pagination or sorting, ensure that all the necessary parameters are included in the bindValue() methods.

Troubleshooting Tip:

To aid in debugging, enable parameter logging by adding the following line to the db array in your config file:

'enableParamLogging'=>true,

This will print out the executed SQL query and the parameters it was attempting to bind, providing valuable information for troubleshooting.

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