Fix | Add null check for getObject() with LocalTime and LocalDate (#1250)

Author: peterbae

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerResultSet.java

@@ -2394,12 +2394,16 @@ public <T> T getObject(int columnIndex, Class<T> type) throws SQLException {
         } else if (type == java.time.LocalDateTime.class || type == java.time.LocalDate.class
                 || type == java.time.LocalTime.class) {
             java.time.LocalDateTime ldt = getLocalDateTime(columnIndex);
-            if (type == java.time.LocalDateTime.class) {
-                returnValue = ldt;
-            } else if (type == java.time.LocalDate.class) {
-                returnValue = ldt.toLocalDate();
+            if (null == ldt) {
+                returnValue = null;
             } else {
-                returnValue = ldt.toLocalTime();
+                if (type == java.time.LocalDateTime.class) {
+                    returnValue = ldt;
+                } else if (type == java.time.LocalDate.class) {
+                    returnValue = ldt.toLocalDate();
+                } else {
+                    returnValue = ldt.toLocalTime();
+                }
             }
         } else if (type == java.time.OffsetDateTime.class) {
             microsoft.sql.DateTimeOffset dateTimeOffset = getDateTimeOffset(columnIndex);

src/test/java/com/microsoft/sqlserver/jdbc/datatypes/DataTypesTest.java

@@ -19,7 +19,9 @@
 import java.text.DateFormatSymbols;
 import java.time.Duration;
 import java.time.Instant;
+import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.time.LocalTime;
 import java.time.ZoneId;
 import java.time.temporal.ChronoUnit;
 import java.time.zone.ZoneOffsetTransition;
@@ -1821,6 +1823,28 @@ public void testGetLocalDateTimePriorGregorian() throws Exception {
             }
         }
     }
+    
+    @Test
+    public void testNullValuesWithGetObject() throws Exception {
+        String ldtTable = AbstractSQLGenerator.escapeIdentifier(RandomUtil.getIdentifier("ldtTable"));
+        try (Connection conn = getConnection(); Statement st = conn.createStatement();) {
+            TestUtils.dropTableIfExists(ldtTable, st);
+            st.execute("CREATE TABLE " + ldtTable + " (c1 datetime2)");
+            st.execute("INSERT INTO " + ldtTable + " VALUES (NULL)");
+
+            try (ResultSet rs = st.executeQuery("SELECT c1 FROM " + ldtTable);) {
+                rs.next();
+                LocalDateTime ldtActual = rs.getObject(1, LocalDateTime.class);
+                assertEquals(ldtActual, null);
+                LocalTime ltActual = rs.getObject(1, LocalTime.class);
+                assertEquals(ltActual, null);
+                LocalDate ldActual = rs.getObject(1, LocalDate.class);
+                assertEquals(ldActual, null);
+            } finally {
+                TestUtils.dropTableIfExists(ldtTable, st);
+            }
+        }
+    }
 
     /**
      * Test example from https://github.com/microsoft/mssql-jdbc/issues/1143