Question

这是我的日志：

08-10 23：11：01.644 2341-2341 / com.projects.learnwords.app E / Database：插入错误＆gt; CORRECT_ENGLISH_WORDS = 0 SECOND_WORD =собакаCORRECT_RUSSIANS_WORDS= 0 FIRST_WORD = dog android.database.sqlite.SQLiteException：没有这样的表：vv :,同时编译：INSERT INTO vv（CORRECT_ENGLISH_WORDS，SECOND_WORD，CORRECT_RUSSIANS_WORDS，FIRST_WORD）VALUES（？，？，？，＆gt;？）;

我的db class：

public class DbControl {
    private static final String DB_NAME = "LearnWordsDB.db";
    private final String TABLE_NAME;
    private final int DB_VERSION;

    static final String FIRST_WORD = "FIRST_WORD";
    static final String SECOND_WORD = "SECOND_WORD";
    static final String CORRECT_FIRST_WORDS = "CORRECT_ENGLISH_WORDS";
    static final String CORRECT_SECOND_WORDS = "CORRECT_RUSSIANS_WORDS";

    private Cursor cursor;
    private SQLiteDatabase database;
    private DbOpenHelper dbOpenHelper;
    private Context context;

public DbControl(Context context, final String TABLE_NAME, int DB_VERSION){
    super();
    this.context = context;
    this.TABLE_NAME = TABLE_NAME;
    this.DB_VERSION =DB_VERSION;
}

public void open() throws SQLException {
    dbOpenHelper = new DbOpenHelper(context, DB_NAME, null, DB_VERSION);
    database = dbOpenHelper.getWritableDatabase();
}

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

public void insert(final String FIRST_WORD, final String SECOND_WORD,
                   final int CORRECT_FIRST_WORDS, final int CORRECT_SECOND_WORDS) {

    ContentValues values = new ContentValues();

    values.put(Dictionary.FIRST_WORD, FIRST_WORD);
    values.put(Dictionary.SECOND_WORD, SECOND_WORD);
    values.put(Dictionary.CORRECT_FIRST_WORDS, CORRECT_FIRST_WORDS);
    values.put(Dictionary.CORRECT_SECOND_WORDS, CORRECT_SECOND_WORDS);

    database.insert(TABLE_NAME, null, values);
}

private class DbOpenHelper extends SQLiteOpenHelper{

    public DbOpenHelper(Context context, final String DB_NAME, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, DB_NAME, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME + " ( _id INTEGER PRIMARY KEY AUTOINCREMENT, " + FIRST_WORD + " TEXT, " +
                SECOND_WORD + " TEXT, " + CORRECT_FIRST_WORDS + " INTEGER, " + CORRECT_SECOND_WORDS + " INTEGER )";
        db.execSQL(CREATE_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        final String DROP_TABLE = "DROP TABLE IF EXISTS " + TABLE_NAME;
        db.execSQL(DROP_TABLE);
        onCreate(db);
    }
  }
}

这里我试图插入：

private void writeToDictionary(String contents, String dictName){

    DbControl dict = new DbControl(getApplicationContext(), dictName, 1);
    DictionaryRow[] dictRows = parseWords(contents);
    try {
        dict.open();
        for(DictionaryRow dr: dictRows) {
                dict.insert(dr.getFirstWord(), dr.getSecondWord(), dr.getCorrectFirstWords(), dr.getCorrectSecondWords());
        }
    } catch (SQLException e)
    {
        Log.e("CREATE_OR_OPEN_ERROR", e.toString());
        Toast.makeText(getApplicationContext(), "Ошибка", Toast.LENGTH_LONG).show();
    }
}

我的手机API级别10。我该如何解决这个问题？

Answer 1

我认为问题是你将TABLE_NAME作为构造函数的参数，期望它在打开现有数据库时创建这个新表，这是行不通的。您应该在onCreate初始化所需的所有表，因为每个数据库只发生一次。

鉴于此，我认为你不应该有那个构造函数参数，我认为你不应该在每次调用DbHelper时创建open()的新实例。我可能会更进一步，让DbControl成为一个单例，它只包装DbHelper并公开你创建的方法。

没有这样的表插入SQLite时出错

1 个答案: