在Sqlite中沒有創建表格

我在我預先存在的數據庫中創建了一個名爲「exercise」的新表格，其他兩個表格食物和用戶都是正常創建的，但在使用SqliteDatabase Browser時看不到表格。我已經升級了我的數據庫版本，並確保create_table以正確的方式完成，但沒有任何內容，請你幫我找出爲什麼沒有創建該表格？在Sqlite中沒有創建表格

public class DatabaseAdapter { 

public static final String COLUMN_ID = "ID"; 
public static final String COLUMN_NAME = "Name"; 
public static final String COLUMN_AGE = "Age"; 
public static final String COLUMN_GENDER = "Gender"; 
public static final String COLUMN_WEIGHT = "Weight"; 
public static final String COLUMN_HEIGHT = "Height"; 
public static final String COLUMN_ACTIVITY = "Activitylevel"; 
public static final String COLUMN_CALORIES = "numCal"; 
public static final String FOOD_ID = "food_ID"; 
public static final String FOOD_NAME = "food_name"; 
public static final String FOOD_CALS = "food_cals"; 
public static final String FOOD_FAT = "food_fat"; 
public static final String FOOD_PRO = "food_protein"; 
public static final String FOOD_CRAB = "food_crabs"; 
public static final String EXERCISE_NAME = "exercise_name"; 
public static final String EXERCISE_CALS = "exercise_cals"; 
public static final String EXERCISE_ID = "exercise_ID"; 

public static final String TABLE_USERS = "users"; 
public static final String TABLE_FOOD = "food"; 
public static final String TABLE_EXERCISE = "exercise"; 
private static final int DATABASE_VERSION = 10; 
private static final String DATABASE_NAME = "nutriwellness.db"; 

private static final String CREATE_TABLE_USERS = "create table users(id integer primary key autoincrement, " 
     + "Name text, Age integer, Gender text, Weight text, Height text, Activitylevel text, numCal float);"; 

private static final String CREATE_TABLE_FOOD = "create table food(food_ID integer primary key," 
     + "food_name text,food_cals real, food_fat real, food_protein real, food_crabs real);"; 

private static final String CREATE_TABLE_EXERCISE = "create table exercise(exercise_ID integer primary key," 
     + "exercise_name text,exercise_cals real);"; 

private SQLiteDatabase database; 
private DatabaseHelper dbHelper; 

private String[] allColumnsofuserstable = { COLUMN_ID, COLUMN_NAME, 
     COLUMN_AGE, COLUMN_GENDER, COLUMN_WEIGHT, COLUMN_HEIGHT, 
     COLUMN_CALORIES }; 

private String[] allColumnoffoodtable = { FOOD_ID, FOOD_NAME, FOOD_FAT, 
     FOOD_PRO, FOOD_CRAB }; 
private String[] allColumnofexercisetable = { EXERCISE_ID, EXERCISE_NAME, 
     EXERCISE_CALS }; 

public DatabaseAdapter(Context context) { 

    dbHelper = new DatabaseHelper(context); 
} 

public static class DatabaseHelper extends SQLiteOpenHelper { 

    public DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, 12); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     try { 
      db.execSQL(CREATE_TABLE_USERS); 
      db.execSQL(CREATE_TABLE_FOOD); 
      db.execSQL(CREATE_TABLE_EXERCISE); 
     } catch (SQLException e) { 

      e.printStackTrace(); 
     } 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     Log.w(DatabaseHelper.class.getName(), 
       "Upgrading database from version " + oldVersion 
         + "to version " + newVersion); 

     db.execSQL("DROP TABLE IF EXISTS users"); 
     db.execSQL("DROP TABLE IF EXISTS food"); 
     db.execSQL("DROP_TABLE IF EXISTS exercise"); 

     onCreate(db); 

    } 

} 

public DatabaseAdapter open() throws SQLException { 
    database = dbHelper.getWritableDatabase(); 
    return this; 
} 

public void close() { 
    dbHelper.close(); 
} 

// create a user 
public long createUser(String name, String age, String gender, 
     String weight, String height, String level, float calnum) { 

    ContentValues values = new ContentValues(); 
    values.put(COLUMN_NAME, name); 
    values.put(COLUMN_AGE, age); 

    values.put(COLUMN_GENDER, gender); 

    values.put(COLUMN_WEIGHT, weight); 
    values.put(COLUMN_HEIGHT, height); 
    values.put(COLUMN_ACTIVITY, level); 
    values.put(COLUMN_CALORIES, calnum); 

    return database.insert(TABLE_USERS, COLUMN_ID, values); 
} 

// delete a user by ID 
public boolean deleteUser(long rowId) { 
    return database.delete(TABLE_USERS, COLUMN_ID + "=" + rowId, null) > 0; 
} 

// retrieve a list of all users 
public Cursor getAllUsers() { 
    return database.query(TABLE_USERS, allColumnsofuserstable, null, null, 
      null, null, null); 

} 

// retrieve a particular user 
public Cursor getUser(long rowId) throws SQLException { 
    Cursor mCursor = database.query(true, TABLE_USERS, 
      allColumnsofuserstable, COLUMN_ID + "=" + rowId, null, null, 
      null, null, null); 
    if (mCursor != null) { 
     mCursor.moveToFirst(); 
    } 
    return mCursor; 

} 

// update a user 
public boolean updateUser(long rowId, String Name, int age, String gender, 
     String weight, String height, String level, float calnum) { 
    ContentValues values = new ContentValues(); 
    values.put(COLUMN_NAME, Name); 
    values.put(COLUMN_AGE, age); 

    values.put(COLUMN_GENDER, gender); 

    values.put(COLUMN_WEIGHT, weight); 
    values.put(COLUMN_HEIGHT, height); 
    values.put(COLUMN_ACTIVITY, level); 
    values.put(COLUMN_CALORIES, calnum); 
    return database.update(TABLE_USERS, values, COLUMN_ID + "=" + rowId, 
      null) > 0; 
} 

// FOOD METHODS ! 

// Create a new food row 
public long createFood(String name, double food_cal, double food_fat, 
     double food_proteins, double food_carbs) { 
    ContentValues Fvalues = new ContentValues(); 
    Fvalues.put(FOOD_NAME, name); 
    Fvalues.put(FOOD_CALS, food_cal); 
    Fvalues.put(FOOD_FAT, food_fat); 
    Fvalues.put(FOOD_PRO, food_proteins); 
    Fvalues.put(FOOD_CRAB, food_carbs); 
    return database.insert(TABLE_FOOD, FOOD_ID, Fvalues); 
} 

// delete a Food by ID 
public boolean deleteFood(long rowId) { 
    return database.delete(TABLE_FOOD, FOOD_ID + "=" + rowId, null) > 0; 
} 

// retrieve a list of all FOOD 
public ArrayList<String> getAllfood() { 
    Cursor c = database.query(TABLE_FOOD, allColumnoffoodtable, null, null, 
      null, null, null); 
    ArrayList<String> food = new ArrayList<String>(); 

    c.moveToFirst(); 
    while (!c.isAfterLast()) { 
     food.add(c.getString(1)); 
     c.moveToNext(); 
    } 

    return food; 

} 

// Retrieve a specific Food 

public Cursor getFood(long rowId) throws SQLException { 
    Cursor mCursor = database.query(true, TABLE_FOOD, allColumnoffoodtable, 
      FOOD_ID + "=" + rowId, null, null, null, null, null); 
    if (mCursor != null) { 
     mCursor.moveToFirst(); 
    } 
    return mCursor; 

} 

// Update a food 

public boolean updateFood(long rowId, String name, int food_cal, 
     int food_fat, int food_proteins, int food_carbs) { 
    ContentValues Fvalues = new ContentValues(); 
    Fvalues.put(FOOD_NAME, name); 
    Fvalues.put(FOOD_CALS, food_cal); 
    Fvalues.put(FOOD_FAT, food_fat); 
    Fvalues.put(FOOD_PRO, food_proteins); 
    Fvalues.put(FOOD_CRAB, food_carbs); 
    return database 
      .update(TABLE_FOOD, Fvalues, FOOD_ID + "=" + rowId, null) > 0; 
} 

// //////////////////////////////// EXERCISE 
// TABLE/////////////////////////////////////////////////// 

public long createExercise(String name, double exercise_cals) { 
    ContentValues Fvalues = new ContentValues(); 
    Fvalues.put(EXERCISE_NAME, name); 
    Fvalues.put(EXERCISE_CALS, exercise_cals); 

    return database.insert(TABLE_EXERCISE, EXERCISE_ID, Fvalues); 
} 

public Cursor getExercise(long rowId) throws SQLException { 
    Cursor mCursor = database.query(true, TABLE_EXERCISE, 
      allColumnofexercisetable, EXERCISE_ID + "=" + rowId, null, 
      null, null, null, null); 
    if (mCursor != null) { 
     mCursor.moveToFirst(); 
    } 
    return mCursor; 

} 

public ArrayList<String> getAllexercise() { 
    Cursor c = database.query(TABLE_EXERCISE, allColumnofexercisetable, 
      null, null, null, null, null); 
    ArrayList<String> exercise = new ArrayList<String>(); 

    c.moveToFirst(); 
    while (!c.isAfterLast()) { 
     exercise.add(c.getString(1)); 
     c.moveToNext(); 
    } 

    return exercise; 

} 

public boolean deleteexercise(long rowId) { 
    return database.delete(TABLE_EXERCISE, EXERCISE_ID + "=" + rowId, null) > 0; 
}

}

來源

2012-04-28 callback

檢查你的logcat，你得到了「從版本升級數據庫..」警告或錯誤？並刪除db.execSQL中的下劃線（「DROP_TABLE」 – zapl 2012-04-28 10:41:12

我是否應該通過啓動我的應用程序來獲取該消息？ – callback 2012-04-28 10:46:23

既然這樣你的代碼工作（在我的測試正確創建的所有表），所以我的假設是，這是導致該問題的升級代碼。

也許是因爲你已經將版本號12硬編碼到openhelper中，並且以前的數據庫也是版本12，所以沒有執行升級並且數據庫正處於當前狀態。

嘗試更改版本號（使用類常量）並在您更改數據庫模式時增加版本號。僅當指定的版本大於數據庫版本時纔會調用OnUpgrade。

即代替

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

public DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, 12); 
    }

此外，「DROP_TABLE IF EXISTS演習」是無效的SQL。刪除下劃線。

來源

2012-04-28 10:54:30 Kuffs

您的代碼看是沒什麼問題，但幾件事情提

聲明該數據庫版本

私有靜態最終詮釋DATABASE_VERSION = 10;

，並在使用12在構造

public DatabaseHelper(Context context) { 
      super(context, DATABASE_NAME, null, 12); 
     }

你可能已經改變DATABASE_VERSION的價值，但使用的是在構造函數中的靜態值。

在升級表已在最後一個命令

db.execSQL("DROP TABLE IF EXISTS users"); 
    db.execSQL("DROP TABLE IF EXISTS food"); 

// here you have used DROP_TABLE 

    db.execSQL("DROP_TABLE IF EXISTS exercise");

，哪些是你可以做的是寫DROP_TABLE，只需卸載該應用程序，並重新安裝它會爲你工作。

來源

2012-04-28 13:14:30

在Sqlite中沒有創建表格

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