我有一个 sqlite 数据库，我把这个文件放在“assets”文件夹中。
代码如下，请帮忙指出这段代码有什么问题，
如何使用自己的sqlite数据库。
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_PATH = "/data/data/com.SGMalls/databases/";
private static String DB_NAME = "mallMapv2.sqlite";
private SQLiteDatabase myDataBase;
private final Context myContext;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
public void createDataBase() throws IOException {
File dbDir = new File(DB_PATH);
if (!dbDir.exists()) {
dbDir.mkdir();
}
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
close();
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
boolean isnull=false;
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) {
isnull=true;
checkDB.close();
}
return isnull;
}
private void copyDataBase() throws IOException {
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if (myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
public class GetData {
private static String DB_PATH = "/data/data/com.SGMalls/databases/mallMapv2.sqlite";
// private static String DB_NAME = "mallMapv2.sqlite";
public static ArrayList<Mall> getMalls() {
ArrayList<Mall> mallsList = new ArrayList<Mall>();
SQLiteDatabase malldatabase = SQLiteDatabase.openDatabase(DB_PATH,
null, SQLiteDatabase.OPEN_READONLY);
String queryString="select id,title from malls order by title";
Cursor cursor=malldatabase.rawQuery(queryString, null);
if(cursor!=null){
cursor.moveToFirst();
while(!cursor.isLast()){
Mall mall=new Mall();
mall.setMallid(cursor.getInt(0));
mall.setMallname(cursor.getString(0));
mallsList.add(mall);
cursor.moveToNext();
}
}
malldatabase.close();
return mallsList;
}
}
错误信息:
ERROR/Database(725): sqlite3_open_v2("/data/data/com.SGMalls/databases/ mallMapv2.sqlite", &handle, 1, NULL) failed
03-15 22:34:11.747: ERROR/AndroidRuntime(725): Uncaught handler: thread main exiting due to uncaught exception
03-15 22:34:11.766: ERROR/AndroidRuntime(725): java.lang.Error: Error copying database
非常感谢
所有日志错误信息
03-16 16:19:18.871: ERROR/vold(550): Error opening switch name path
'/sys/class/switch/test2' (No such file or directory)
03-16 16:19:18.871: ERROR/vold(550): Error bootstrapping switch '/sys/class/switch/test2' (m)
03-16 16:19:18.871: ERROR/vold(550): Error opening switch name path '/sys/class/switch/test' (No such file or directory)
03-16 16:19:18.871: ERROR/vold(550): Error bootstrapping switch '/sys/class/switch/test' (m)
03-16 16:19:19.091: ERROR/flash_image(558): can't find recovery partition
03-16 16:19:33.100: ERROR/MemoryHeapBase(577): error opening /dev/pmem: No such file or directory
03-16 16:19:33.100: ERROR/SurfaceFlinger(577): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake
03-16 16:19:33.151: ERROR/GLLogger(577): couldn't load <libhgl.so> library (Cannot find library)
03-16 16:19:33.261: ERROR/GLLogger(577): couldn't load <libhgl.so> library (Cannot find library)
03-16 16:19:36.471: ERROR/BatteryService(577): Could not open '/sys/class/power_supply/usb/online'
03-16 16:19:36.471: ERROR/BatteryService(577): Could not open '/sys/class/power_supply/battery/batt_vol'
03-16 16:19:36.471: ERROR/BatteryService(577): Could not open '/sys/class/power_supply/battery/batt_temp'
03-16 16:19:36.850: ERROR/EventHub(577): could not get driver version for /dev/input/mouse0, Not a typewriter
03-16 16:19:36.880: ERROR/EventHub(577): could not get driver version for /dev/input/mice, Not a typewriter
03-16 16:19:36.950: ERROR/System(577): Failure starting core service
03-16 16:19:36.950: ERROR/System(577): java.lang.SecurityException
03-16 16:19:36.950: ERROR/System(577): at android.os.BinderProxy.transact(Native Method)
03-16 16:19:36.950: ERROR/System(577): at
android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146)
03-16 16:19:36.950: ERROR/System(577): at android.os.ServiceManager.addService(ServiceManager.java:72)
03-16 16:19:36.950: ERROR/System(577): at com.android.server.ServerThread.run(SystemServer.java:163)
03-16 16:19:36.959: ERROR/AndroidRuntime(577): Crash logging skipped, no checkin service
03-16 16:19:38.219: ERROR/LockPatternKeyguardView(577): Failed to bind to GLS while
checking for account
03-16 16:19:39.790: ERROR/jdwp(623): Failed sending req to debugger: Broken pipe (-1 of 27)
03-16 16:19:39.790: ERROR/jdwp(623): Failed sending reply to debugger: Broken pipe
03-16 16:19:42.960: ERROR/ApplicationContext(577): Couldn't create directory for SharedPreferences file shared_prefs/wallpaper-hints.xml
03-16 16:19:44.051: ERROR/ActivityThread(621): Failed to find provider info for android.server.checkin
03-16 16:19:45.341: ERROR/ActivityThread(621): Failed to find provider info for android.server.checkin
03-16 16:19:45.432: ERROR/ActivityThread(621): Failed to find provider info for android.server.checkin
03-16 16:19:51.651: ERROR/Database(715): sqlite3_open_v2("/data/data/com.SGMalls/databases/mallMapv2.sqlite", &handle, 1, NULL) failed
03-16 16:19:51.701: ERROR/AndroidRuntime(715): Uncaught handler: thread main exiting due to uncaught exception
03-16 16:19:51.710: ERROR/AndroidRuntime(715): java.lang.Error: Error copying database
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at Unit.DataBaseHelper.createDataBase(DataBaseHelper.java:47)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at com.Test.Test.onCreate(Test.java:23)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.app.ActivityThread.access$1800(ActivityThread.java:112)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.os.Handler.dispatchMessage(Handler.java:99)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.os.Looper.loop(Looper.java:123)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at android.app.ActivityThread.main(ActivityThread.java:3948)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at java.lang.reflect.Method.invokeNative(Native Method)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at java.lang.reflect.Method.invoke(Method.java:521)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
03-16 16:19:51.710: ERROR/AndroidRuntime(715): at dalvik.system.NativeStart.main(Native Method)
最佳答案
已经为此提出了一个错误。
使用此 api 作为解决方法:
Context.openOrCreateDatabase("mmyown.db", MODE_PRIVATE, null);
关于android - 使用我自己的 SQLite 数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2452017/