update zh-cn/application-dev/database/data-persistence-by-rdb-store.md.

Signed-off-by: N 葛亚芳 <geyafang@huawei.com>

update zh-cn/application-dev/database/data-persistence-by-rdb-store.md.
Signed-off-by: N 葛亚芳 <geyafang@huawei.com>
b821ef63 · 葛亚芳 · Gitee · 9d00f73d · b821ef63
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     console.info('Succeeded in deleting RdbStore.');
   });
   ```
+
+## 相关实例
+
+针对关系型数据库的开发，有以下相关实例可供参考：
+
+- [`Rdb`：关系型数据库（ArkTS）（API9）](https://gitee.com/openharmony/codelabs/tree/master/Data/Rdb)
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