[#1989] Add Record.changed(Field<?>), changed(int), changed(String) to

check whether a single field's value has changed

jOOQ-test/src/org/jooq/test/_/testcases/RecordTests.java

@@ -106,7 +106,11 @@ extends BaseTest<A, AP, B, S, B2S, BS, L, X, DATE, BOOL, D, T, U, I, IPK, T725,
         B book = create().selectFrom(TBook()).where(TBook_ID().eq(1)).fetchOne();
 
         assertFalse(book.changed());
+        assertFalse(book.changed(TBook_TITLE()));
+        assertFalse(book.changed(TBook_TITLE().getName()));
         book.setValue(TBook_TITLE(), "abc");
         assertTrue(book.changed());
+        assertTrue(book.changed(TBook_TITLE()));
+        assertTrue(book.changed(TBook_TITLE().getName()));
     }
 }

jOOQ/src/main/java/org/jooq/Record.java

@@ -379,6 +379,24 @@ public interface Record extends FieldProvider, Attachable {
      */
     boolean changed();
 
+    /**
+     * Check if a field's value has been changed from its original as fetched
+     * from the database.
+     */
+    boolean changed(Field<?> field);
+
+    /**
+     * Check if a field's value has been changed from its original as fetched
+     * from the database.
+     */
+    boolean changed(int fieldIndex);
+
+    /**
+     * Check if a field's value has been changed from its original as fetched
+     * from the database.
+     */
+    boolean changed(String fieldName);
+
     /**
      * Convert this record into an array.
      * <p>

jOOQ/src/main/java/org/jooq/impl/AbstractRecord.java

@@ -369,6 +369,21 @@ abstract class AbstractRecord extends AbstractStore implements Record {
         return false;
     }
 
+    @Override
+    public final boolean changed(Field<?> field) {
+        return changed(getIndex(field));
+    }
+
+    @Override
+    public final boolean changed(int fieldIndex) {
+        return getValue0(fieldIndex).isChanged();
+    }
+
+    @Override
+    public final boolean changed(String fieldName) {
+        return changed(getIndex(fieldName));
+    }
+
     @Override
     public final Object[] intoArray() {
         return into(Object[].class);