fix code

hutool-db/src/test/java/cn/hutool/db/DbTest.java

@@ -36,12 +36,22 @@ public class DbTest {
 		// 测试数据库中一共4条数据，第0页有3条，第1页有1条
 		final List<Entity> page0 = Db.of().page(Entity.create("user"), Page.of(0, 3));
 		Assert.assertEquals(3, page0.size());
+
 		final List<Entity> page1 = Db.of().page(Entity.create("user"), Page.of(1, 3));
 		Assert.assertEquals(1, page1.size());
 	}
 
 	@Test
 	public void pageTest2() {
+		final long count = Db.of().count(Entity.create("user"), Page.of(1, 3));
+		Assert.assertEquals(1, count);
+
+		final List<Entity> page1 = Db.of().page(Entity.create("user"), Page.of(1, 3));
+		Assert.assertEquals(1, page1.size());
+	}
+
+	@Test
+	public void pageBySqlTest() {
 		final String sql = "select * from user order by name";
 		// 测试数据库中一共4条数据，第0页有3条，第1页有1条
 		final List<Entity> page0 = Db.of().page(