2
我想檢查數據庫是否存在,並且我從互聯網上找到了一些代碼。Android如何檢查數據庫是否存在
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
,但我得到一個error..cannot打開文件 爲什麼它不能工作?
: sqlite returned: error code = 14, msg = cannot open file at line 27703 of [8609a15dfa], db=/data/data/com.testing.abcde/databases/scj
: sqlite returned: error code = 14, msg = os_unix.c: open() at line 27703 - "" errno=2 path=/data/data/com.testing.abcde/databases/scj, db=/data/data/com.testing.abcde/databases/scj
: sqlite3_open_v2("/data/data/com.testing.abcde/databases/scj", &handle, 1, NULL) failed
: Failed to open the database. closing it.
: android.database.sqlite.SQLiteCantOpenDatabaseException: unable to open database file
: at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
: at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1013)
: at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:986)
: at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:962)
: at com.lkland.softkeyboard.easytype.SQLite.checkDataBase(SQLite.java:80)
: at com.lkland.softkeyboard.easytype.SQLite.createDataBase(SQLite.java:55)
你應該接受關於previos問題的一些答案,以獲得更多新的答案。 – nkr 2012-07-25 19:41:04
[查詢是否存在Android數據庫!](http://stackoverflow.com/questions/3386667/query-if-android-database-exists) – rds 2015-05-09 10:55:15