我正在延长SQLiteAssetHelper类使用我从资产文件夹中预先填充的数据库，但我的应用程序崩溃并给出错误消息Caused by: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database.
当我登记入住时ddms，没有数据库文件夹或我的db文件输入data/data/com.sqlitetospinner1/。因此，为了进行测试，我创建了一个名为的文件夹databases并将 db 文件推入其中。此后，该应用程序开始完美运行。
这意味着我的AssetsHelper类无法复制数据库。
AssetsHelper class:-
public class AssetsHelper extends SQLiteAssetHelper {
private static final String DATABASE_NAME = "mydb.sqlite";
private static final int DATABASE_VERSION = 1;
public AssetsHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public List<String> getAllColleges(){
List<String> colleges = new ArrayList<String>();
// Select All Query
String selectQuery = "SELECT * FROM colleges_list ORDER BY Organization_Name";
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
colleges.add(cursor.getString(1));
} while (cursor.moveToNext());
}
// closing connection
cursor.close();
db.close();
// returning colleges
return colleges;
}
LogCat:-
08-25 08:41:21.927: W/SQLiteAssetHelper(27504): copying database from assets...
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): Couldn't open mydb.sqlite for writing (will try read-only):
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): com.readystatesoftware.sqliteasset.SQLiteAssetHelper$SQLiteAssetException: Missing databases/mydb.sqlite file (or .zip, .gz archive) in assets, or target folder not writable
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at android.content.res.AssetManager.openAsset(Native Method)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at android.content.res.AssetManager.open(AssetManager.java:316)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at android.content.res.AssetManager.open(AssetManager.java:290)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.copyDatabaseFromAssets(SQLiteAssetHelper.java:436)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.createOrOpenDatabase(SQLiteAssetHelper.java:400)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getWritableDatabase(SQLiteAssetHelper.java:176)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getReadableDatabase(SQLiteAssetHelper.java:254)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at com.crm.AssetsHelper.getAllColleges(AssetsHelper.java:38)
08-25 08:41:22.107: E/SQLiteAssetHelper(27504): at dalvik.system.NativeStart.main(Native Method)
08-25 08:41:22.117: E/SQLiteLog(27504): (14) cannot open file at line 30191 of [00bb9c9ce4]
08-25 08:41:22.117: E/SQLiteLog(27504): (14) os_unix.c:30191: (2) open(/data/data/com.sqlitetospinner1/databases/mydb.sqlite) -
08-25 08:41:22.167: E/SQLiteDatabase(27504): Failed to open database '/data/data/com.sqlitetospinner1/databases/mydb.sqlite'.
08-25 08:41:22.167: E/SQLiteDatabase(27504): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
08-25 08:41:22.167: E/SQLiteDatabase(27504): at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
08-25 08:41:22.167: E/SQLiteDatabase(27504): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
08-25 08:41:22.167: E/SQLiteDatabase(27504): at com.crm.AssetsHelper.getAllColleges(AssetsHelper.java:38)
Missing databases/mydb.sqlite file (or .zip, .gz archive) in assets, or target folder not writable
你的数据库文件里有吗assets/databases folder?
不，仅在资产文件夹中
SQLiteAssetHelper期望找到预填充的数据库文件databases下的文件夹assets.
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
