How to print Core Data debug values?

by

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

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