类型不匹配：无法从Cursor转换为String []错误

Question

public Cursor fetchThePassword(long paramLong) throws SQLException {
    SQLiteDatabase localSQLiteDatabase = this.db;
    String[] localObject = new String[2];
    localObject[0] = "id";
    localObject[1] = "pass";
    localObject = localSQLiteDatabase.query(true, "register", localObject, "id=" +aramLong, null, null, null, null, null);
    if (localObject != null)
        ((Cursor)localObject).moveToFirst();  
    return localObject; 

 }

Answer 1

您创建一个字符串数组localObject并将其强制转换为Cursor。这不行。

 ((Cursor)localObject).moveToFirst();

Answer 2

我不知道你到底想要做什么，但最好的猜测如下：

public String fetchThePassword(long paramLong) throws SQLException {
    SQLiteDatabase localSQLiteDatabase = this.db;
    String[] columns = new String[] { "pass" };
    Cursor cursor = localSQLiteDatabase.query(true, "register", columns, "id=" + paramLong,
            null, null, null, null, null);

    String result = null;
    if (cursor.moveToFirst()) {
        // value from the pass column 
        result = cursor.getString(0);
    }
    cursor.close();
    // result is either the pass or null
    return result;
}