Android 中的 jdbc 问题 - 无法连接到数据库

发布于 2024-11-27 10:00:14 字数 1803 浏览 0 评论 0原文

我是 jdbc 和 android 的新手。如果这个问题看起来很愚蠢,请原谅我。
我正在尝试从应用程序连接到 MySql 数据库。
我浏览了 jdbc 教程并编写了以下代码:


 public static void connectToServer () 
{
Connection conn = null;
try
{
//Connect to the database String userName = "********"; String password = "********"; String url = "jdbc:mysql://my.domain.name/myDBname"; Class.forName ("com.mysql.jdbc.Driver").newInstance (); conn = DriverManager.getConnection (url, userName, password); Log.e(tag,"Database connection established"); // Query the database Statement s = conn.createStatement (); String query = "INSERT INTO myTableName (A,B,C)" + "VALUES ('a','b','c')"); Log.e(tag,query); s.executeQuery (query); s.close (); } catch (Exception e) { Log.e(tag,"Database Connection Failed"); Log.e(tag,e.getMessage()); } finally { if (conn != null) { try { conn.close (); Log.e(tag,"Database connection terminated"); } catch (Exception e) { /* ignore close errors */ } } } }


我的清单代码:
<代码> <使用权限 android:name="android.permission.ACCESS_FINE_LOCATION" />
<使用权限 android:name="android.permission.ACCESS_COARSE_LOCATION" />

日志猫是:
<代码> ....
数据库连接终止//我的输出
com.mysql.jdbc.Driver // 异常 e.getMessage() 的输出

我做错了什么?
从 java 应用程序和 Android 应用程序连接有区别吗?

编辑:添加清单权限

I am new to jdbc and android. So pardon me if the question seems silly.

I am trying to connect to a MySql database from an app.

I went through the jdbc tutorial and wrote the following code:


 public static void connectToServer () 
{
Connection conn = null;
try
{
//Connect to the database String userName = "********"; String password = "********"; String url = "jdbc:mysql://my.domain.name/myDBname"; Class.forName ("com.mysql.jdbc.Driver").newInstance (); conn = DriverManager.getConnection (url, userName, password); Log.e(tag,"Database connection established"); // Query the database Statement s = conn.createStatement (); String query = "INSERT INTO myTableName (A,B,C)" + "VALUES ('a','b','c')"); Log.e(tag,query); s.executeQuery (query); s.close (); } catch (Exception e) { Log.e(tag,"Database Connection Failed"); Log.e(tag,e.getMessage()); } finally { if (conn != null) { try { conn.close (); Log.e(tag,"Database connection terminated"); } catch (Exception e) { /* ignore close errors */ } } } }

My manifest code:

< uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
< uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />


The logcat is:

....
Database connection terminated //my output
com.mysql.jdbc.Driver // output from exception e.getMessage()

What am I doing wrong?
Is there a difference between connecting from a java application and android app?


EDIT : Added manifest permissions

如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。

扫码二维码加入Web技术交流群

发布评论

需要 登录 才能够评论, 你可以免费 注册 一个本站的账号。

评论(3

新一帅帅 2024-12-04 10:00:14

确保您在清单中请求互联网权限。

编辑:为此,请将 添加到您的清单中。

刚刚找到链接。不确定这是否可以轻松完成。

另外值得研究的是 CouchDB。它基于 REST,因此您不必围绕 MySQL DB 构建 php 服务 - 它纯粹是 REST。

Be sure you are requesting internet permissions in your manifest.

EDIT: To do this, add <uses-permission android:name="android.permission.INTERNET" /> to your manifest.

Just found this link. Not sure if this can be done easily.

Also something else to look into is CouchDB. Its REST based, so you wouldn't have to build a php service around the MySQL DB - its purely REST.

瑶笙 2024-12-04 10:00:14

我知道这对一些人有用。确保使用 JDBC 连接器 mysql-connector-java-3.0.17-ga-bin.jar。谷歌一下。

I know that this has worked for some. Make sure you use the JDBC connector mysql-connector-java-3.0.17-ga-bin.jar. Google for it.

寒冷纷飞旳雪 2024-12-04 10:00:14

为什么不花一些时间学习 android.database.sqlite 呢?恕我直言,从长远来看这是值得的。

祝你好运。

Why not spend some time learning android.database.sqlite instead? IMHO, it'll be worth it in the long run.

Good luck.

~没有更多了~
我们使用 Cookies 和其他技术来定制您的体验包括您的登录状态等。通过阅读我们的 隐私政策 了解更多相关信息。 单击 接受 或继续使用网站,即表示您同意使用 Cookies 和您的相关数据。
原文