How Can I Debug Core Data SQL Queries in Xcode 4?

Unlocking Core Data SQL Debugging in Xcode 4: A Practical Guide

Need to see the actual SQL queries executed by your Core Data app in Xcode 4? This guide provides a clear, step-by-step method to enable SQL debugging.

Configuring Your Xcode Project

1. Access the project's scheme settings by going to "Product" -> "Edit Scheme".
2. In the left-hand panel, select the "Run" configuration for your application (e.g., "Run YOURAPP.app").
3. Switch to the "Arguments" tab.
4. In the "Arguments Passed On Launch" section, add the following argument: <code>-com.apple.CoreData.SQLDebug 4</code> (adjust the number 4—representing verbosity level—to a value between 1 and 4 as needed).

Accessing the SQL Logs

With SQL debugging enabled, the raw SQL queries will be displayed in the Xcode console. This is the same location where you would normally view NSLog output.

Argument Example:

For maximum detail in your SQL logs, use this argument:

<code>-com.apple.CoreData.SQLDebug 4</code>

Important Consideration:

Remember to apply these settings to the specific scheme you are using for testing or debugging. This ensures that SQL debugging is activated only for the relevant scheme.

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