我的目標是構建定製版本的SQLite(特別是R-Tree啓用)以包含在我的Android項目中。動機源於:Android定製SQLite構建 - 無法打開數據庫
Android SQLite R-Tree - How to install module?
的SQLite在如何做到這一點一些指令:
http://www.sqlite.org/android/doc/trunk/www/index.wiki
我已經編譯SQLite和成功列入我的項目共享庫。我遇到的問題是,只要我調用諸如getReadableDatabase()
或getWriteableDatabase()
之類的操作,就會收到SQLiteCantOpenDatabaseException。
import org.sqlite.database.sqlite.SQLiteDatabase;
import org.sqlite.database.sqlite.SQLiteOpenHelper;
代替:
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
要注意,我用的是很重要的爲了使用通過NDK和JNI的自定義SQLite構建。
MySQLiteHelper:
public class MySQLiteHelper extends SQLiteOpenHelper {
static {
System.loadLibrary("sqliteX");
}
private static final String DATABASE_NAME = "mydata.db";
private static final int DATABASE_VERSION = 1;
Context myContext;
public MySQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
myContext = context;
}
public void getEntry(){
SQLiteDatabase db = this.getReadableDatabase();
db.close();
}
public void createEntry(){
// 1. get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
//...
//...
db.close();
}
@Override
public void onCreate(SQLiteDatabase database) {
String create_rtree = "CREATE VIRTUAL TABLE demo_index USING rtree(\n" +
" id, -- Integer primary key\n" +
" minX, maxX, -- Minimum and maximum X coordinate\n" +
" minY, maxY -- Minimum and maximum Y coordinate\n" +
");";
database.execSQL(create_rtree);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(MySQLiteHelper.class.getName(),
"Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS " + "demo_index");
onCreate(db);
}
}
主要活動:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MySQLiteHelper helper = new MySQLiteHelper(this);
helper.createEntry();
setContentView(R.layout.activity_my);
}
堆棧跟蹤:
10-29 13:45:38.356 2360-2360/com.example.nathanielwendt.lstrtree E/SQLiteLog﹕ (14) os_unix.c:30589: (2) open(//arrrr.db) -
10-29 13:45:38.376 2360-2360/com.example.nathanielwendt.lstrtree E/SQLiteDatabase﹕ Failed to open database 'arrrr.db'.
org.sqlite.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at org.sqlite.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at org.sqlite.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:217)
at org.sqlite.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:201)
at org.sqlite.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:467)
at org.sqlite.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:189)
at org.sqlite.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:181)
at org.sqlite.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:809)
at org.sqlite.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:794)
at org.sqlite.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:699)
at org.sqlite.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:722)
at org.sqlite.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:228)
at org.sqlite.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:168)
at com.example.nathanielwendt.lstrtree.MySQLiteHelper.createEntry(MySQLiteHelper.java:65)
at com.example.nathanielwendt.lstrtree.MyActivity.onCreate(MyActivity.java:25)
我在這裏就沒有見過這樣幾個職位這個相同的異常,但他們似乎都涉及到進口數據庫從別的地方在磁盤上,他們沒有正確設置文件路徑。這似乎是最相關的職位:Android SQLiteOpenHelper cannot open database file,但沒有任何建議工作。
我已經嘗試過使用2種不同的手機和模擬器,並且收到相同的錯誤。此外,我已經用默認的android sqlite導入代替了上面討論的導入,並且它工作正常(因爲我沒有嘗試創建R-Tree,因爲它沒有包含在默認的Android SQLite安裝中)。將數據庫目錄和.db文件的權限更改爲777並未解決問題,也沒有將WRITE_PERMISSION添加到我的清單中。
你實際嘗試訪問什麼路徑? – 2014-10-30 02:22:06