How to print Core Data debug values?

Question

How can I print the values being sent to the sqlite database while using Core Data SQL Debug?

Using the \"-com.apple.CoreData.SQLDebug 1\" in my \"

Answer 1

If you are using Xcode 8, you will need to also need to add additional argument

-com.apple.CoreData.Logging.stderr 1

Answer 2

Open "Product -> Scheme -> Edit Scheme..." in Xcode and add to "Arguments Passed on Launch":

-com.apple.CoreData.SQLDebug 3
-com.apple.CoreData.Logging.stderr 1 

(The second launch argument is needed for Core Data debugging on iOS 10/macOS 10.12 or later, see com.apple.CoreData.SQLDebug not working for more information.)

The you'll see all the values that the SQL statements are bound to. Example output:

test56[1588:c07] CoreData: sql: BEGIN EXCLUSIVE
test56[1588:c07] CoreData: sql: INSERT INTO ZEVENT(Z_PK, Z_ENT, Z_OPT, ZTIMESTAMP) VALUES(?, ?, ?, ?)
test56[1588:c07] CoreData: details: SQLite bind[0] = (int64)13
test56[1588:c07] CoreData: details: SQLite bind[1] = (int64)1
test56[1588:c07] CoreData: details: SQLite bind[2] = (int64)1
test56[1588:c07] CoreData: details: SQLite bind[3] = "368650709.435904"
test56[1588:c07] CoreData: sql: COMMIT