Android SQLiteOpenHelper无法打开数据库文件
我知道这个问题以前讨论过。 但是我找不到解决问题的办法,所以我要再问一次。 我在创建数据库时遇到问题。 我复制了SQLiteOpenHelper的实现:Android SQLiteOpenHelper无法打开数据库文件,android,file,sqlite,Android,File,Sqlite,我知道这个问题以前讨论过。 但是我找不到解决问题的办法,所以我要再问一次。 我在创建数据库时遇到问题。 我复制了SQLiteOpenHelper的实现: public class DBCreator extends SQLiteOpenHelper { private static final String DATABASE_NAME = "servision.db"; private static final int DATABASE_VERSION = 1; p
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;
}
}
我从主活动onCreate方法创建它,如下所示
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
06-01 17:31:15.523:INFO/global(2470):BufferedInputStream构造函数中使用的默认缓冲区大小。如果需要8k缓冲区,最好是显式的。
06-01 17:31:15.652:INFO/Database(4160):sqlite返回:错误代码=14,消息=无法打开源代码行25467处的文件
06-01 17:31:15.652:错误/数据库(4160):sqlite3_open_v2(“/data/data/com.servision.svclient/databases/servision.db”,&handle,6,NULL)失败
06-01 17:31:15.722:错误/SQLiteOpenHelper(4160):无法打开servision.db进行写入(将尝试只读):
06-01 17:31:15.722:错误/SQLiteOpenHelper(4160):android.database.sqlite.SQLiteException:无法打开数据库文件
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.database.sqlite.SQLiteDatabase.dbopen(本机方法)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.database.sqlite.SQLiteDatabase.(SQLiteDatabase.java:1921)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:883)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:960)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:953)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:602)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.database.sqlite.SQLiteOpenHelper.getwriteabledatabase(SQLiteOpenHelper.java:98)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:158)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于com.servision.svclient.Main.onCreate(Main.java:52)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.os.Handler.dispatchMessage(Handler.java:99)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.os.Looper.loop(Looper.java:123)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于android.app.ActivityThread.main(ActivityThread.java:4627)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于java.lang.reflect.Method.invokenactive(本机方法)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于java.lang.reflect.Method.invoke(Method.java:521)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
06-01 17:31:15.722:ERROR/SQLiteOpenHelper(4160):位于dalvik.system.NativeStart.main(本机方法)
06-01 17:31:15.738:信息/数据库(4160):sqlite返回:错误代码=14,消息=无法打开源代码行25467处的文件
06-01 17:31:15.738:错误/数据库(4160):sqlite3_open_v2(“/data/data/com.servision.svclient/databases/servision.db”,&handle,1,NULL)失败
从不调用onCreate of DBCreator。
我正在从Eclipse以调试模式在Galaxy S上运行程序。
我是否缺少一些权限?
可能是上下文不好或其他原因?关于sqlite返回的
error code=14,msg=cannot open file at source line 25467
和sqlite3\u open\u v2(“/data/data/com.servision.svclient/databases/servision.db”,&handle,1,NULL)失败
错误,这似乎是由于没有数据库而Android试图创建数据库时造成的
有些人在这里读书
此链接中已出现错误 使用以下api openOrCreateDatabase(“sample.db”,MODE_PRIVATE,null) 试试这个链接
检查清单中的权限 加
我的应用程序出现问题,在重新安装应用程序后,用旧数据库更改数据库文件会导致该错误。 我猜问题在于旧DB文件的所有者与重新安装的应用程序的文件所有者不同。因此,解决方案是授予新文件完全权限(777),以便其他用户也可以读取该文件
最后,请确保您没有文件权限问题。我也遇到过类似的问题,下面是我解决问题的方法: 总而言之:
adb shell
cd /data/data/YOUR.APP.PACKAGE/databases/
ls
这将为您提供应用程序使用的数据库列表
cp your_database.db your_database.db_backup
rm your_database.db
当我得到这个错误时,我将这个代码用于我的构造函数
public DBClass(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
context.openOrCreateDatabase(DATABASE_NAME, context.MODE_PRIVATE, null);
}
能否尝试从数据库名称中删除*.db文件扩展名(将数据库名称从servision.db更改为servision)?嗨,Daniel,谢谢您的快速回答。不,更改名称没有任何帮助。您是否手动检查了读/写数据库的权限?我遇到了一些奇怪的市场崩溃,报告说在一些罕见的情况下,我的应用程序无法打开数据库进行写作。我保护我
public DBClass(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
context.openOrCreateDatabase(DATABASE_NAME, context.MODE_PRIVATE, null);
}