在android上的sqlite數據庫中創建表格

Question

 
@Override 
     public void onCreate(SQLiteDatabase db) 
     { 
      try{ 
       db.execSQL("create table " +   NotificationManager.getUserStatic(context) + "log ("+ 
       KEY_TIME +" INTEGER primary key, "+ KEY_TEXT +" TEXT not null);"); 

      } 
      catch (SQLException e) { 
       e.printStackTrace(); 
      } 
     } 

     /** 
     * onOpen method called when app is opening. 
     */ 

     @Override 
     public void onOpen(SQLiteDatabase db) 
     { 
      try{ 
       System.out.println("tophere"); 
       db.execSQL("create table if not exists "+DATABASE_NAME+"." + NotificationManager.getUserStatic(context) + "log ("+ 
       KEY_TIME +" INTEGER primary key, "+ KEY_TEXT +" TEXT not null);"); 
       System.out.println("downhere"); 
      } 
      catch (SQLException e){ 
       e.printStackTrace(); 
      } 
     } 

我們有用於爲應用程序創建數據庫的代碼。問題是，據我們所知，它不會創建表，所以當我們嘗試插入表中並從中讀取時，它會崩潰。我們已經嘗試了一切，System.out.println在那裏查看它失敗的位置。我們得到了tophere，但它永遠不會到達日誌中的downhere部分，所以我們猜測有些東西會導致它在那裏失敗。我們檢查了DDMS數據庫是否在正確的文件夾中，所以數據庫應該在那裏，但由於某種原因它無法找到它（日誌中的第2行和第3行）。

有什麼想法？

這是錯誤日誌：

 
04-27 10:45:46.768: I/System.out(6441): tophere 
04-27 10:45:46.772: I/SqliteDatabaseCpp(6441): sqlite returned: error code = 1, msg = unknown database NOPO, db=/data/data/dmri.nopo/databases/NOPO 
04-27 10:45:46.772: W/System.err(6441): android.database.sqlite.SQLiteException: unknown database NOPO: , while compiling: create table if not exists NOPO.log (time INTEGER primary key, text TEXT not null); 
04-27 10:45:46.792: W/System.err(6441):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
04-27 10:45:46.792: W/System.err(6441):  at android.database.sqlite.SQLiteCompiledSql.(SQLiteCompiledSql.java:68) 
04-27 10:45:46.811: W/System.err(6441):  at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:134) 
04-27 10:45:46.811: W/System.err(6441):  at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361) 
04-27 10:45:46.811: W/System.err(6441):  at android.database.sqlite.SQLiteStatement.acquireAndLock(SQLiteStatement.java:260) 
04-27 10:45:46.811: W/System.err(6441):  at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:84) 
04-27 10:45:46.811: W/System.err(6441):  at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1899) 
04-27 10:45:46.823: W/System.err(6441):  at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1839) 
04-27 10:45:46.823: W/System.err(6441):  at dmri.nopo.DBAdapter$DatabaseHelper.onOpen(DBAdapter.java:67) 
04-27 10:45:46.823: W/System.err(6441):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:180) 
04-27 10:45:46.902: W/System.err(6441):  at dmri.nopo.DBAdapter.open(DBAdapter.java:86) 
04-27 10:45:46.912: W/System.err(6441):  at dmri.nopo.LogManager.readLogFile(LogManager.java:32) 
04-27 10:45:46.912: W/System.err(6441):  at dmri.nopo.LogActivity.onCreate(LogActivity.java:25) 
04-27 10:45:46.921: W/System.err(6441):  at android.app.Activity.performCreate(Activity.java:4465) 
04-27 10:45:46.921: W/System.err(6441):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
04-27 10:45:46.931: W/System.err(6441):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
04-27 10:45:46.931: W/System.err(6441):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
04-27 10:45:46.941: W/System.err(6441):  at android.app.ActivityThread.access$600(ActivityThread.java:123) 
04-27 10:45:46.941: W/System.err(6441):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
04-27 10:45:46.953: W/System.err(6441):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-27 10:45:46.953: W/System.err(6441):  at android.os.Looper.loop(Looper.java:137) 
04-27 10:45:46.972: W/System.err(6441):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
04-27 10:45:46.972: W/System.err(6441):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-27 10:45:46.972: W/System.err(6441):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-27 10:45:46.982: W/System.err(6441):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
04-27 10:45:46.982: W/System.err(6441):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
04-27 10:45:46.992: W/System.err(6441):  at dalvik.system.NativeStart.main(Native Method) 
04-27 10:45:47.002: I/SqliteDatabaseCpp(6441): sqlite returned: error code = 1, msg = no such table: log, db=/data/data/dmri.nopo/databases/NOPO 
04-27 10:45:47.012: D/AndroidRuntime(6441): Shutting down VM 
04-27 10:45:47.012: W/dalvikvm(6441): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 
04-27 10:45:47.181: E/AndroidRuntime(6441): FATAL EXCEPTION: main 
04-27 10:45:47.181: E/AndroidRuntime(6441): java.lang.RuntimeException: Unable to start activity ComponentInfo{dmri.nopo/dmri.nopo.LogActivity}: android.database.sqlite.SQLiteException: no such table: log: , while compiling: SELECT time, text FROM log 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.ActivityThread.access$600(ActivityThread.java:123) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.os.Looper.loop(Looper.java:137) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at dalvik.system.NativeStart.main(Native Method) 
04-27 10:45:47.181: E/AndroidRuntime(6441): Caused by: android.database.sqlite.SQLiteException: no such table: log: , while compiling: SELECT time, text FROM log 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteCompiledSql.(SQLiteCompiledSql.java:68) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:127) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:94) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteQuery.(SQLiteQuery.java:53) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at dmri.nopo.DBAdapter.getAllSMS(DBAdapter.java:116) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at dmri.nopo.LogManager.readLogFile(LogManager.java:34) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at dmri.nopo.LogActivity.onCreate(LogActivity.java:25) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.Activity.performCreate(Activity.java:4465) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
04-27 10:45:47.181: E/AndroidRuntime(6441):  ... 11 more 

Answer 1

的一切我都首先推薦使用android.util.Log在Android中記錄異常。

第二 - 我懷疑你有創建了錯誤名稱的表。你的錯誤說查詢無法找到「日誌」，但我看到你在「CREATE」語句中做了一些連接。這可能是原因。

您可以檢查實際爲您創建的內容。通過查看創建的SQLite基礎。

你可以試試：

1. adb shell
2. cd /data/data/<your.package.name>/databases
3. sqlite3 <yourdbname>
4. .tables

Answer 2

這將幫助你，我已經嘗試過了，它也在努力

這僅僅是一個例子

public class DatabaseMarks { 

    public static final String KEY_STUID = "stuid"; 
    public static final String KEY_SUB1 = "subject_one"; 
    public static final String KEY_SUB2 = "subject_two"; 
    public static final String KEY_SUB3= "subject_three"; 
    public static final String KEY_MARKS1= "marks_one"; 
    public static final String KEY_MARKS2 = "marks_two"; 
    public static final String KEY_MARKS3 = "marks_three"; 

    private static final String DATABASE_NAME = "Student"; 
    private static final String DATABASE_MARKSTABLE = "StudentMarks"; 
    private static final int DATABASE_VERSION = 1; 

    private DbHelper ourHelper; 
    private final Context ourContext; 
    private SQLiteDatabase ourDatabase; 

    private static class DbHelper extends SQLiteOpenHelper{ 

     public DbHelper(Context context) { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
      // TODO Auto-generated constructor stub 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) { 
      // TODO Auto-generated method stub 
       db.execSQL(" CREATE TABLE " + DATABASE_MARKSTABLE + " (" + 
        KEY_STUID + " TEXT PRIMARY KEY, " + 
        KEY_SUB1 + " TEXT NOT NULL, " + 
        KEY_SUB2 + " TEXT NOT NULL, " + 
        KEY_SUB3 + " TEXT NOT NULL, " + 
        KEY_MARKS1 + " INTEGER NOT NULL, " + 
        KEY_MARKS2 + " INTEGER NOT NULL, " + 
        KEY_MARKS3 + " INTEGER NOT NULL);" 
      ); 
     } 

     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      // TODO Auto-generated method stub 

      db.execSQL("DROP TABLE IF EXISTS " + DATABASE_MARKSTABLE); 
      onCreate(db); 
     } 

    } 
    public DatabaseMarks(Context c){ 
     ourContext = c; 
    } 
    public DatabaseMarks open()throws SQLException{ 
     ourHelper = new DbHelper(ourContext); 
     ourDatabase = ourHelper.getWritableDatabase(); 
     return this; 
    } 
    public void close(){ 
     ourHelper.close(); 
    } 
    public long createInsert(String stuid, String subject1, String subject2, 
      String subject3, String marks1, String marks2, String marks3) { 
     // TODO Auto-generated method stub 
     ContentValues cv = new ContentValues(); 
     cv.put(KEY_STUID, stuid); 
     cv.put(KEY_SUB1, subject1); 
     cv.put(KEY_SUB2, subject2); 
     cv.put(KEY_SUB3, subject3); 
     cv.put(KEY_MARKS1, marks1); 
     cv.put(KEY_MARKS2, marks2); 
     cv.put(KEY_MARKS3, marks3); 
     return ourDatabase.insert(DATABASE_MARKSTABLE, null, cv); 

    } 

Answer 3

刪除您SQLS的DATABASE_NAME一部分。

如果你想NOPO你的數據庫名稱，並希望創建一個表log，則：

private static class DatabaseHelper extends SQLiteOpenHelper { 

    DatabaseHelper(Context context) { 
     super(context, "NOPO", null, 2); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL("CREATE TABLE " + "log" + " (" 
       + KEY_TIME +" INTEGER primary key, " 
       + KEY_TEXT +" TEXT not null);"); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
       + newVersion + ", which will destroy all old data"); 
     db.execSQL("DROP TABLE IF EXISTS log"); 
     onCreate(db); 
    } 
} 

super(context, "NOPO", null, 2);使得這DatabaseHelper對象只是在NOPO數據庫環境，所以你需要在SQL指定它。

ps。我硬編碼的東西，你應該避免它。

Answer 4

public class LoginDataDataBaseAdapter static final String DATABASE_NAME =「login.db」;

static final int DATABASE_VERSION = 1; 

    public static final int NAME_COLUMN = 1; 

    // TODO: Create public field for each column in your table. 
    // SQL Statement to create a new database. 

    static final String DATABASE_CREATE = "create table "+"LOGIN"+ 
           "(" +"ID"+" integer primary key autoincrement,"+ "USERNAME text,PASSWORD text,UNAME text); "; 

    // Variable to hold the database instance 
    public SQLiteDatabase db; 

    // Context of the application using the database. 
    private final Context context; 

    // Database open/upgrade helper 
    private DataBaseHelper dbHelper; 

    public LoginDataBaseAdapter(Context _context) 
    { 
     context = _context; 
     dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION); 

    } 
    public LoginDataBaseAdapter open() throws SQLException 
    { 
     db = dbHelper.getWritableDatabase(); 
     return this; 
    } 
    public void close() 
    { 
     db.close(); 
    } 

    public SQLiteDatabase getDatabaseInstance() 
    { 
     return db; 
    } 

Answer 5

  public class DBHandler extends SQLiteOpenHelper { 
       private static String DATABASE_NAME = "mydb"; 
       private static int DATABASE_VERSION = 1; 

       String TABLE_NAME = "Student"; 

       String KEY_ID = "id"; 
       String KEY_STUDENT_NAME = "name"; 
       String KEY_STUDENT_MARKS = "marks"; 

      public DBHandler(Context context) { 
        super(context, DATABASE_NAME, null, DATABASE_VERSION); 
       } 

     @Override 
      public void onCreate(SQLiteDatabase db) { 
       // creating table 
       String query = "CREATE TABLE " + TABLE_NAME + 
         " (" + 
         KEY_ID + " INTEGER PRIMARY KEY," + 
         KEY_STUDENT_NAME + " TEXT," + 
         KEY_STUDENT_MARKS + " INTEGER" 
         ") "; 
       db.execSQL(query); 

      // insertion in the table 
      ContentValues values = new ContentValues(); 
      values.put(KEY_QUESTION_ID, "1"); 
      values.put(KEY_STUDENT_NAME , "abc"); 
      values.put(KEY_STUDENT_MARKS , "95"); 
      db.insert(TABLE_NAME, null, values); 

      values.put(KEY_QUESTION_ID, "2"); 
      values.put(KEY_STUDENT_NAME , "def"); 
      values.put(KEY_STUDENT_MARKS , "93"); 
      db.insert(TABLE_NAME, null, values); 
    } 
     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      // TODO Auto-generated method stub 

      db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); 
      // Create tables again 
      onCreate(db); 
     } 
    // retrieve date 
    List<Student> getAllData(int Id) { 

      List<Student> student = new ArrayList<Student>(); 
      // Select All Query 
      String selectQuery = "SELECT * FROM " + TABLE_NAME + " WHERE KEY_ID =" + "'" + Id + "'"; 

      SQLiteDatabase db = this.getWritableDatabase(); 

      Cursor cursor = db.rawQuery(selectQuery, null); 

      // looping through all rows and adding to list 
      if (cursor.moveToFirst()) { 
       do { 
        Student std = new Student(); 
        u.setId(cursor.getInt(0)); 
        u.setStudentName(cursor.getString(1)); 
        u.setMarks(cursor.getString(2)); 

        student.add(std); 
       } while (cursor.moveToNext()); 
      } 
      // return student list 
      return student; 
     } 
    } 

    public class Student { 

     public static int Id; 
     public static String studentName; 
     public static int marks; 

     public int getId() { 
      return Id; 
     } 

     public static void setId(int id) { 
      Id = id; 
     } 

     public String getStudentName() { 
      return studentName; 
     } 

     public static void setStudentName(String studentName) { 
      Student.studentName = studentName; 
     } 

     public int getMarks() { 
      return marks; 
     } 

     public static void setMarks(int marks) { 
      Student.marks = marks; 
     } 
    } 

    public class MainActivity extends AppCompatActivity { 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 

      DBHandler db = new DBHandler(getApplicationContext()); 
      List<Student> std = new ArrayList<Student>(); 
      rl = db.getAllData(1); 
      for (Student s : std) { 
       Log.v("Id",s.getId()); 
       Log.v("Name",s.getStudentName()); 
       Log.v("Marks",s.getMarks()); 
     } 
    } 
}