我知道这个话题之前已被讨论过了。 但我无法找到问题的解决方案，所以我会再问一次。 我有创建数据库的问题。 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;
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();
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
onCreate of DBCreator。 我在Eclipse的调试模式下在Galaxy S上运行程序。 我错过了一些权限吗？ 可能是背景不好还是什么？
答案 0 :(得分：7)
关于sqlite returned: error code = 14, msg = cannot open file at source line 25467和sqlite3_open_v2("/data/data/com.servision.svclient/databases/servision.db", &handle, 1, NULL) failed错误，这似乎是在没有数据库并且Android尝试创建数据库时引起的。
有些人在这里阅读
http://androidblogger.blogspot.com/2011/02/instable-android-and-unable-to-open.html
http://www.itsalif.info/content/check-if-database-exist-android-sqlite3openv2-failed
答案 1 :(得分：6)
检查清单中的权限 添加
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
答案 2 :(得分：4)
当我收到此错误时，我将此代码用于构造函数
public DBClass(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
context.openOrCreateDatabase(DATABASE_NAME, context.MODE_PRIVATE, null);
}
答案 3 :(得分：1)
我的应用程序出现问题，在重新安装应用程序后，使用旧的数据库更改我的datebase文件给了我这个错误。 我想问题是旧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。所以它解决了给新文件的完全权限（777）所以它也可以被其他用户阅读。
最后，请确保您没有文件权限问题。
答案 4 :(得分：0)
我有类似的问题，这就是我如何解决它：
https://stackoverflow.com/a/22743794/1947094
总结一下：
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
答案 5 :(得分：-1)
此链接中已经出现错误
http://code.google.com/p/android/issues/detail?id=949
使用以下api ...
context.openOrCreateDatabase（“sample.db”，MODE_PRIVATE，null）;
试试此链接
http://www.itsalif.info/content/check-if-database-exist-android-sqlite3openv2-failed