GRDB 7: DatabaseCursor has a primary associated type

GRDB/Core/Statement.swift

@@ -719,7 +719,7 @@ extension Statement {
 /// [`sqlite3_reset`](https://www.sqlite.org/c3ref/reset.html) when the cursor
 /// is created, and when it is deallocated. Don't share the same prepared
 /// statement between two cursors!
-public protocol DatabaseCursor: Cursor {
+public protocol DatabaseCursor<Element>: Cursor {
     /// Must be initialized to false.
     var _isDone: Bool { get set }
 

TODO.md

@@ -128,7 +128,7 @@
 - [ ] GRDB7: Sendable: SQL (ac33856f)
 - [ ] GRDB7: Split Row.swift (2ce8a619)
 - [ ] GRDB7: Cleanup ValueReducer (6c73b1c5)
-- [ ] GRDB7: DatabaseCursor has a primary associated type (b11c5dd2)
+- [X] GRDB7: DatabaseCursor has a primary associated type (b11c5dd2)
 - [ ] GRDB7: Enable Strict Concurrency Checks (6aa43ded)
 - [ ] GRDB7: Sendable: OrderedDictionary (e022c35b)
 - [ ] GRDB7: Rename ReadWriteBox to ReadWriteLock (7f5205ef)

Tests/GRDBTests/DatabaseCursorTests.swift

@@ -213,6 +213,15 @@ class DatabaseCursorTests: GRDBTestCase {
 //        }
     }
 
+    // This test passes if it compiles
+    func testAssociatedType() throws {
+        func accept(_ cursor: some DatabaseCursor<String>) { }
+        func useCursor(_ db: Database) throws {
+            let cursor = try String.fetchCursor(db, sql: "SELECT 'foo'")
+            accept(cursor)
+        }
+    }
+
     // For profiling tests
     let profilingSQL = """
         WITH RECURSIVE