【发布时间】：2011-06-01 14:36:15
【问题描述】：
我知道之前讨论过这个主题。 但是我找不到解决问题的方法，所以我要再问一次。 我在创建数据库时遇到问题。 我已经复制了 SQLiteOpenHelper 的实现：
public class DBCreator extends SQLiteOpenHelper
{
private static final String DATABASE_NAME = "servision.db";
private static final int DATABASE_VERSION = 1;
private static final String INFO_TABLE ="create table INFO(key text,value text);";
public static final String GATEWAYS_TABLE = "GATEWAYS";
// Table name
public static final String TABLE = "events";
// Columns
public static final String TIME = "time";
public static final String TITLE = "title";
public DBCreator(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
try
{
String gatewaytablescript ="create table" +GATEWAYS_TABLE+"(" +
"id int primary key, " +
"host text not null," +
"port int not null," +
"username text," +
"password text,"+
"useproxy int," +
"proxyHost text," +
"proxyPort port," +
"desc text," +
"secondaryip text," +
"secondaryport int," +
"timezone int," +
"encryption int," +
"customkey text" +
");";
Log.d("DBCreator", "Creating " + GATEWAYS_TABLE + "table");
db.execSQL(gatewaytablescript);
String infotablescript ="create table " + INFO_TABLE + "(key text,value text);";
Log.d("DBCreator", "Creating " + INFO_TABLE + "table");
db.execSQL(infotablescript);
}
catch(SQLException ex)
{
Log.d("DBCreator", "onCreate exception " +ex.getMessage());
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
Log.d("EventsData", "onUpgrade");
if (oldVersion >= newVersion)
return;
}
}
我从主要活动 onCreate 方法创建它。
DBCreator db =new DBCreator(this);
db.getReadableDatabase();
在 logcat 中我收到以下信息：
06-01 17:31:15.523: INFO/global(2470): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required.
06-01 17:31:15.652: INFO/Database(4160): sqlite returned: error code = 14, msg = cannot open file at source line 25467
06-01 17:31:15.652: ERROR/Database(4160): sqlite3_open_v2("/data/data/com.servision.svclient/databases/servision.db", &handle, 6, NULL) failed
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): Couldn't open servision.db for writing (will try read-only):
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): android.database.sqlite.SQLiteException: unable to open database file
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1921)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:883)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:960)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:953)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:602)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:158)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at com.servision.svclient.Main.onCreate(Main.java:52)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.os.Handler.dispatchMessage(Handler.java:99)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.os.Looper.loop(Looper.java:123)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at android.app.ActivityThread.main(ActivityThread.java:4627)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at java.lang.reflect.Method.invokeNative(Native Method)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at java.lang.reflect.Method.invoke(Method.java:521)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): at dalvik.system.NativeStart.main(Native Method)
06-01 17:31:15.738: INFO/Database(4160): sqlite returned: error code = 14, msg = cannot open file at source line 25467
06-01 17:31:15.738: ERROR/Database(4160): sqlite3_open_v2("/data/data/com.servision.svclient/databases/servision.db", &handle, 1, NULL) failed
永远不会调用 DBCreator 的 onCreate。 我在 Eclipse 的调试模式下在 Galaxy S 上运行程序。 我是否缺少一些权限？ 可能是上下文不好还是什么？
【问题讨论】：
-
您能否尝试从您的数据库名称中删除 *.db 文件扩展名（将 DATABASE_NAME 从 servision.db 更改为 servion）？
-
嗨丹尼尔，感谢您的快速回答。不更改名称没有帮助。
-
您是否手动检查了您对数据库的读/写权限？我遇到了一些奇怪的市场崩溃，报告说在极少数情况下我的应用程序无法打开数据库进行写入。我保护它以处理这种特殊情况，但我不知道任何解决方法。如果您没有读取/写入文件的权限，我认为您无能为力
-
我通过从设备中手动删除整个应用程序文件夹解决了这个问题。
-
@AlexS 是的，我也很想知道。我不明白您删除应用程序文件夹的意思。您的意思是删除并重新创建文件夹吗？你的意思是你只是在其他地方创建了你的数据库？请展开。提前致谢！