Fix issue encoding null values

Author: aguibert

vertx-db2-client/src/main/java/io/vertx/db2client/impl/codec/DB2ParamDesc.java

@@ -50,6 +50,8 @@ public String prepare(TupleInternal values) {
     }
 
     private static boolean canConvert(Object val, int type) {
+    	if (val == null)
+    		return true;
     	if (ClientTypes.canConvert(val, type))
     		return true;
     	Class<?> clazz = val.getClass();

vertx-db2-client/src/main/java/io/vertx/db2client/impl/drda/ClientTypes.java

@@ -211,6 +211,9 @@ static public int mapDB2TypeToDriverType(boolean isDescribed, int sqlType, long
     }
 
     public static boolean canConvert(Object value, int toType) {
+    	if (value == null)
+    		return true;
+    	
     	Class<?> clazz = value.getClass();
     	// Everything can convert to String
     	if (clazz == String.class)

vertx-sql-client/src/test/java/io/vertx/sqlclient/tck/BinaryDataTypeEncodeTestBase.java

@@ -27,12 +27,12 @@ public abstract class BinaryDataTypeEncodeTestBase extends DataTypeTestBase {
   public void testSmallInt(TestContext ctx) {
     testEncodeGeneric(ctx, "test_int_2", Short.class, (short) Short.MIN_VALUE);
   }
-
+  
   @Test
   public void testInteger(TestContext ctx) {
     testEncodeGeneric(ctx, "test_int_4", Integer.class, (int) Integer.MIN_VALUE);
   }
-
+  
   @Test
   public void testBigInt(TestContext ctx) {
     testEncodeGeneric(ctx, "test_int_8", Long.class, (long) Long.MIN_VALUE);
@@ -82,7 +82,55 @@ public void testDate(TestContext ctx) {
   public void testTime(TestContext ctx) {
     testEncodeGeneric(ctx, "test_time", LocalTime.class, LocalTime.of(12,1,30));
   }
-
+  
+  @Test
+  public void testNullValues(TestContext ctx) {
+	    connector.connect(ctx.asyncAssertSuccess(conn -> {
+	        conn
+	          .preparedQuery(statement("UPDATE basicdatatype SET" + 
+	        		  " test_int_2 = ", 
+	        	      ", test_int_4 = ",
+	        	      ", test_int_8 = ",
+	        	      ", test_float_4 = ",
+	        	      ", test_float_8 = ",
+	        	      ", test_numeric = ",
+	        	      ", test_decimal = ",
+	        	      ", test_boolean = ",
+	        	      ", test_char = ",
+	        	      ", test_varchar = ",
+	        	      ", test_date = ",
+	        	      ", test_time = ",
+	        		  " WHERE id = 2"))
+	          .execute(Tuple.tuple()
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null)
+	        		  .addValue(null), 
+	        		  ctx.asyncAssertSuccess(updateResult -> {
+	          conn
+	            .preparedQuery("SELECT * FROM basicdatatype WHERE id = 2")
+	            .execute(ctx.asyncAssertSuccess(result -> {
+	            ctx.assertEquals(1, result.size());
+	            Row row = result.iterator().next();
+	            ctx.assertEquals(13, row.size());
+	            ctx.assertEquals(2, row.getInteger(0));
+	            for (int i = 1; i < 13; i++) {
+	              ctx.assertNull(row.getValue(i));
+	            }
+	            conn.close();
+	          }));
+	        }));
+	      }));
+  }
+  
   protected <T> void testEncodeGeneric(TestContext ctx,
                                        String columnName,
                                        Class<T> clazz,
@@ -96,6 +144,7 @@ protected <T> void testEncodeGeneric(TestContext ctx,
           .execute(ctx.asyncAssertSuccess(result -> {
           ctx.assertEquals(1, result.size());
           Row row = result.iterator().next();
+          ctx.assertEquals(1, row.size());
           ctx.assertEquals(expected, row.getValue(0));
           ctx.assertEquals(expected, row.getValue(columnName));
 //        ctx.assertEquals(expected, row.get(clazz, 0));