Coerce row values to string for Row#getString

vertx-db2-client/src/test/java/io/vertx/db2client/QueryVariationsTest.java

@@ -4,6 +4,7 @@
 
 import java.util.Arrays;
 import java.util.function.Consumer;
+import java.util.regex.Pattern;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -44,6 +45,46 @@ public void testRenamedColumns(TestContext ctx) {
       }));
     }));
   }
+
+  private void verifyTimestamp(TestContext ctx, String tStamp) {
+    // ex: 2020-09-26T03:10:52.263752
+    ctx.assertTrue(Pattern.matches("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}.*", tStamp),
+        "Expected to get a timestamp matching the format YYYY-MM-DDThh:mm:ss.nnnnnn but got: " + tStamp);
+  }
+
+  @Test
+  public void testCurrentTimestamp(TestContext ctx) {
+    connect(ctx.asyncAssertSuccess(conn -> {
+      conn.query("SELECT CURRENT TIMESTAMP FROM SYSIBM.SYSDUMMY1").execute(
+          ctx.asyncAssertSuccess(rowSet -> {
+        ctx.assertEquals(1, rowSet.size());
+        RowIterator<Row> rows = rowSet.iterator();
+        ctx.assertTrue(rows.hasNext());
+        Row row = rows.next();
+        // Should be able to read the row as a LocalDateTime or String
+        verifyTimestamp(ctx, row.getLocalDateTime(0).toString());
+        verifyTimestamp(ctx, row.getString(0));
+        conn.close();
+      }));
+    }));
+  }
+
+  @Test
+  public void testCurrentTimestampPrepared(TestContext ctx) {
+    connect(ctx.asyncAssertSuccess(conn -> {
+      conn.preparedQuery("SELECT CURRENT TIMESTAMP FROM SYSIBM.SYSDUMMY1").execute(
+          ctx.asyncAssertSuccess(rowSet -> {
+        ctx.assertEquals(1, rowSet.size());
+        RowIterator<Row> rows = rowSet.iterator();
+        ctx.assertTrue(rows.hasNext());
+        Row row = rows.next();
+        // Should be able to read the row as a LocalDateTime or String
+        verifyTimestamp(ctx, row.getLocalDateTime(0).toString());
+        verifyTimestamp(ctx, row.getString(0));
+        conn.close();
+      }));
+    }));
+  }
 
   @Test
   public void testSubquery(TestContext ctx) {

vertx-sql-client/src/main/java/io/vertx/sqlclient/Tuple.java

@@ -370,7 +370,7 @@ default String getString(int pos) {
     } else if (val instanceof Enum<?>) {
       return ((Enum<?>) val).name();
     } else {
-      throw new ClassCastException();
+      return String.valueOf(val);
     }
   }
 
@@ -474,7 +474,14 @@ default LocalTime getLocalTime(int pos) {
    */
   @GenIgnore(GenIgnore.PERMITTED_TYPE)
   default LocalDateTime getLocalDateTime(int pos) {
-    return (LocalDateTime) getValue(pos);
+    Object val = getValue(pos);
+    if (val == null) {
+      return null;
+    } else if (val instanceof LocalDateTime) {
+      return (LocalDateTime) val;
+    } else {
+      return (LocalDateTime) val; // Throw CCE
+    }
   }
 
   /**
@@ -508,7 +515,14 @@ default OffsetTime getOffsetTime(int pos) {
    */
   @GenIgnore(GenIgnore.PERMITTED_TYPE)
   default OffsetDateTime getOffsetDateTime(int pos) {
-    return (OffsetDateTime) getValue(pos);
+    Object val = getValue(pos);
+    if (val == null) {
+      return null;
+    } else if (val instanceof OffsetDateTime) {
+      return (OffsetDateTime)val;
+    } else {
+      return (OffsetDateTime) val; // Throw CCE
+    }
   }
 
   /**