How to Enable and Troubleshoot SQL Debugging in Xcode 4 for Core Data?

SQL Debugging for Core Data in Xcode 4: Enabling and Troubleshooting Guide

During iOS app debugging, the ability to view the SQL queries being executed is critical. This article will explore how to enable this feature in Xcode 4 and resolve common issues faced by developers.

Enable SQL debugging

To enable SQL debugging, click "Product" -> "Edit Scheme". In the left panel, select "Run YOURAPP.app" and go to the "Arguments" tab of the main panel. Here, add an "Argument Passed On Launch" with the value:

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

The number after "SQLDebug" can be between 1 and 4. The larger the number, the more detailed the log. Click "OK" to save changes.

Verify debug output

When enabled, SQL queries will be output to the same location where you view NSLog messages. Please verify that the parameters are passed correctly and that SQL debugging is active.

Troubleshooting

If you don't see SQL output, make sure you are debugging the correct scheme. Parameter changes must be made to the scheme you intend to use for testing. Double-check the scheme settings and make sure "Argument Passed On Launch" has been added correctly.

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