fix SQLProvider.updateSelective update empty

src/main/java/com/imyeyu/spring/util/SQLProvider.java

@@ -278,7 +278,7 @@ public class SQLProvider {
 		}
 		String setClause = meta.fieldColumnList.stream()
 		                                       .filter(FieldColumn::isNotId)
-		                                       .filter(fc -> fc.isNotEmpty(entity))
+		                                       .filter(fc -> fc.isNotNull(entity))
 		                                       .map(fc -> "`%s` = #{%s}".formatted(fc.columnName, fc.fieldName))
 		                                       .collect(Collectors.joining(", "));
 		return "UPDATE `%s` SET %s WHERE `%s` = #{%s}".formatted(meta.table, setClause, meta.idFieldColumn.columnName, meta.idFieldColumn.fieldName);
@@ -551,6 +551,18 @@ public class SQLProvider {
 			}
 		}
 
+		public boolean isNull(Object entity) {
+			try {
+				return Ref.getFieldValue(entity, field, Object.class) == null;
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException(e);
+			}
+		}
+
+		public boolean isNotNull(Object entity) {
+			return !isNull(entity);
+		}
+
 		public boolean isEmpty(Object entity) {
 			try {
 				return TimiJava.isEmpty(Ref.getFieldValue(entity, field, Object.class));