Databases
StackOverflow2013
Postsdbo
POFailed To open Database in Android (Pre-Creating)
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POFailed To open Database in Android (Pre-Creating)
    primarykey
    data
    text
    <p>I have put my sqlite database file in the "assets" folder And i write a DataManager class to get data from database,But I am Getting RunTime Error .. I used Debug tool to see where exactly I got to know at <code>CreateDataBase()</code> Error Raised .. Please Help me Sombody to fix the issue</p> <p>This is My Datamanager class . I am precreating database for android but i m getting file not found exception please Help me ..I have showed my Logcat Below .</p> <p><b> (DATAMANAGER Class) </b></p> <pre><code>package com.example.applicationdatabase; import android.content.ContentValues; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteException; import android.database.sqlite.SQLiteOpenHelper; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class DataBaseManager extends SQLiteOpenHelper { // The Android's default system path of your application database. //data/data/ and /databases remain the same always. The one that must be changed is com.example which represents //the MAIN package of your project private static String DB_PATH = "/data/data/com.example.applicationdatabase/databases"; //the name of your database private static String DB_NAME = "database"; private static SQLiteDatabase mDataBase; private static DataBaseManager sInstance = null; // database version private static final int DATABASE_VERSION = 1; /** * Constructor Takes and keeps a reference of the passed context in order to * access to the application assets and resources. */ private DataBaseManager() { super(ApplicationContextProvider.getContext(), DB_NAME, null, DATABASE_VERSION); try { createDataBase(); openDataBase(); } catch (IOException e) { e.printStackTrace(); } } /** * Singleton for DataBase * * @return singleton instance */ public static DataBaseManager instance() { if (sInstance == null) { sInstance = new DataBaseManager(); } return sInstance; } /** * Creates a empty database on the system and rewrites it with your own * database. * * @throws java.io.IOException io exception */ private void createDataBase() throws IOException { boolean dbExist = checkDataBase(); if (dbExist) { // do nothing - database already exist } else { // By calling this method an empty database will be created into // the default system path // of your application so we are gonna be able to overwrite that // database with our database. this.getReadableDatabase(); try { copyDataBase(); } catch (IOException e) { throw new Error("Error copying database"); } } } /** * Check if the database already exist to avoid re-copying the file each * time you open the application. * * @return true if it exists, false if it doesn't */ 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 doesn't exist yet. } if (checkDB != null) { checkDB.close(); } return checkDB != null; } /** * Copies your database from your local assets-folder to the just created * empty database in the system folder, from where it can be accessed and * handled. This is done by transfering bytestream. * * @throws java.io.IOException io exception */ public void copyDataBase() throws IOException { // Open your local db as the input stream InputStream myInput =ApplicationContextProvider.getContext().getAssets().open(DB_NAME); // Path to the just created empty db String outFileName = DB_PATH + DB_NAME; // Open the empty db as the output stream OutputStream myOutput = new FileOutputStream(outFileName); // transfer bytes from the inputfile to the outputfile byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer)) &gt; 0) { myOutput.write(buffer, 0, length); } // Close the streams myOutput.flush(); myOutput.close(); myInput.close(); } private void openDataBase() throws SQLException { // Open the database String myPath = DB_PATH + DB_NAME; mDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE); } /** * Select method * * @param query select query * @return - Cursor with the results * @throws android.database.SQLException sql exception */ public Cursor select(String query) throws SQLException { return mDataBase.rawQuery(query, null); } /** * Insert method * * @param table - name of the table * @param values values to insert * @throws android.database.SQLException sql exception */ public void insert(String table, ContentValues values) throws SQLException { mDataBase.insert(table, null, values); } /** * Delete method * * @param table - table name * @param where WHERE clause, if pass null, all the rows will be deleted * @throws android.database.SQLException sql exception */ public void delete(String table, String where) throws SQLException { mDataBase.delete(table, where, null); } /** * Update method * * @param table - table name * @param values - values to update * @param where - WHERE clause, if pass null, all rows will be updated */ public void update(String table, ContentValues values, String where) { mDataBase.update(table, values, where, null); } /** * Let you make a raw query * * @param command - the sql comand you want to run */ public void sqlCommand(String command) { mDataBase.execSQL(command); } @Override public synchronized void close() { if (mDataBase != null) mDataBase.close(); super.close(); } @Override public void onCreate(SQLiteDatabase db) { } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } } </code></pre> <p>LogCat:</p> <pre><code>11-30 16:02:18.908: E/SQLiteLog(968): (14) cannot open file at line 30176 of [00bb9c9ce4] 11-30 16:02:18.938: E/SQLiteLog(968): (14) os_unix.c:30176: (2) open(/data/data/com.example.applicationdatabase/databasesdatabase) - 11-30 16:02:18.948: E/SQLiteDatabase(968): Failed to open database '/data/data/com.example.applicationdatabase/databasesdatabase'. 11-30 16:02:18.948: E/SQLiteDatabase(968): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669) 11-30 16:02:18.948: E/SQLiteDatabase(968): at com.example.applicationdatabase.DataBaseManager.checkDataBase(DataBaseManager.java:102) 11-30 16:02:18.948: E/SQLiteDatabase(968): at com.example.applicationdatabase.DataBaseManager.createDataBase(DataBaseManager.java:69) 11-30 16:02:18.948: E/SQLiteDatabase(968): at com.example.applicationdatabase.DataBaseManager.&lt;init&gt;(DataBaseManager.java:39) 11-30 16:02:18.948: E/SQLiteDatabase(968): at com.example.applicationdatabase.DataBaseManager.instance(DataBaseManager.java:55) 11-30 16:02:18.948: E/SQLiteDatabase(968): at com.example.applicationdatabase.DBActivity.onCreate(DBActivity.java:35) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.app.Activity.performCreate(Activity.java:5104) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.app.ActivityThread.access$600(ActivityThread.java:141) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.os.Handler.dispatchMessage(Handler.java:99) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.os.Looper.loop(Looper.java:137) 11-30 16:02:18.948: E/SQLiteDatabase(968): at android.app.ActivityThread.main(ActivityThread.java:5039) 11-30 16:02:18.948: E/SQLiteDatabase(968): at java.lang.reflect.Method.invokeNative(Native Method) 11-30 16:02:18.948: E/SQLiteDatabase(968): at java.lang.reflect.Method.invoke(Method.java:511) 11-30 16:02:18.948: E/SQLiteDatabase(968): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 11-30 16:02:18.948: E/SQLiteDatabase(968): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 11-30 16:02:18.948: E/SQLiteDatabase(968): at dalvik.system.NativeStart.main(Native Method) 11-30 16:02:19.008: E/AndroidRuntime(968): FATAL EXCEPTION: main 11-30 16:02:19.008: E/AndroidRuntime(968): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.applicationdatabase/com.example.applicationdatabase.DBActivity}: java.lang.NullPointerException 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.ActivityThread.access$600(ActivityThread.java:141) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.os.Handler.dispatchMessage(Handler.java:99) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.os.Looper.loop(Looper.java:137) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.ActivityThread.main(ActivityThread.java:5039) 11-30 16:02:19.008: E/AndroidRuntime(968): at java.lang.reflect.Method.invokeNative(Native Method) 11-30 16:02:19.008: E/AndroidRuntime(968): at java.lang.reflect.Method.invoke(Method.java:511) 11-30 16:02:19.008: E/AndroidRuntime(968): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 11-30 16:02:19.008: E/AndroidRuntime(968): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 11-30 16:02:19.008: E/AndroidRuntime(968): at dalvik.system.NativeStart.main(Native Method) 11-30 16:02:19.008: E/AndroidRuntime(968): Caused by: java.lang.NullPointerException 11-30 16:02:19.008: E/AndroidRuntime(968): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188) 11-30 16:02:19.008: E/AndroidRuntime(968): at com.example.applicationdatabase.DataBaseManager.createDataBase(DataBaseManager.java:79) 11-30 16:02:19.008: E/AndroidRuntime(968): at com.example.applicationdatabase.DataBaseManager.&lt;init&gt;(DataBaseManager.java:39) 11-30 16:02:19.008: E/AndroidRuntime(968): at com.example.applicationdatabase.DataBaseManager.instance(DataBaseManager.java:55) 11-30 16:02:19.008: E/AndroidRuntime(968): at com.example.applicationdatabase.DBActivity.onCreate(DBActivity.java:35) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.Activity.performCreate(Activity.java:5104) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 11-30 16:02:19.008: E/AndroidRuntime(968): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 11-30 16:02:19.008: E/AndroidRuntime(968): ... 11 more </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USajtrichards
    1. USkrish
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POFailed To open Database in Android (Pre-Creating)
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    2. VO
      singulars
      1. POFailed To open Database in Android (Pre-Creating)
      1. USkrish
      1. VTFavorite
    1. COAre you getting any other error messages?
      singulars
      1. POFailed To open Database in Android (Pre-Creating)
      1. USajtrichards
    2. COhi socailrel <br> No Whatever the error was in logcat i have displayed.. I have found that the exception is raised at CreateDataBase() i found it by debugging .. This is my logcat <br>
      singulars
      1. POFailed To open Database in Android (Pre-Creating)
      1. USkrish
    3. COCheck Above Logcat File
      singulars
      1. POFailed To open Database in Android (Pre-Creating)
      1. USkrish
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload