update zh-cn/application-dev/database/database-preference-guidelines.md.

Signed-off-by: N @ge-yafang <geyafang@huawei.com>

update zh-cn/application-dev/database/database-preference-guidelines.md.
Signed-off-by: N @ge-yafang <geyafang@huawei.com>
17df3672 · 葛亚芳 · Gitee · 43f37765 · 17df3672
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       console.info("Deleted successfully.")
   }).catch((err) => {
       console.info("Deleted failed with err: " + err)})
-   ```
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+   ```
+## 相关实例
+针对轻量级数据存储开发，有以下相关实例可供参考：
+- [`LiteStorage`：轻量级存储（eTS）（API7）](https://gitee.com/openharmony/app_samples/blob/master/data/LiteStorage)
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