Question

这是我的SQLiteHandler类代码的一部分。

public class SQLiteHandler extends SQLiteOpenHelper implements DataKeyLists {

    private static final String TAG = SQLiteHandler.class.getSimpleName();

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "users";

    // Login table name
    private static final String TABLE_USER = "user";

    // query to create a login table
    private static final String QUERY_CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_USER
            + "("
            + KEY_ID + " INTEGER PRIMARY KEY,"
            + KEY_UID + " TEXT UNIQUE,"
            + KEY_NAME + " TEXT,"
            + KEY_STATUS + " TEXT,"
            + KEY_EMAIL + " TEXT UNIQUE,"
            + KEY_GENDER + " TEXT,"
            + KEY_BIRTHDAY + " TEXT,"
            + KEY_RELIGION + " TEXT,"
            + KEY_NATIONALITY + " TEXT,"
            + KEY_COUNTRY_OF_RESIDENCE + " TEXT,"
            + KEY_CREATED_AT + " TEXT"
            + KEY_UPDATED_AT + " TEXT"
            + ")";

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

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(QUERY_CREATE_LOGIN_TABLE);

        Log.d(TAG, "Database tables created");
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_USER);

        // Create tables again
        onCreate(db);
    }

    /**
     * Storing user details in database
     * */
    public void addUserIntoSQLite(String uid, String name, String status, String email, String gender, String birthday, String created_at, String updated_at) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_UID, uid);
        values.put(KEY_NAME, name);
        values.put(KEY_STATUS, status);
        values.put(KEY_EMAIL, email);
        values.put(KEY_GENDER, gender);
        values.put(KEY_BIRTHDAY, birthday);
        values.put(KEY_CREATED_AT, created_at);
        values.put(KEY_UPDATED_AT, updated_at);

        long id = db.insert(TABLE_USER, null, values);
        db.close();

        Log.d(TAG, "New user is added into sqlite: " + id);
    }
}

我后来添加了一个新列KEY_UPDATED_AT QUERY_CREATE_LOGIN_TABLE查询并重新启动了该应用程序现在我在Logcat上收到以下消息。

Error inserting uid=564ef4c43388d0.82002082 birthday=1982-07-27 updated_at=null email=learn@android.com status=user name=learnandroid created_at=2015-11-20 05:24:04 gender=Male
11-20 15:41:42.976 8659-8852/? E/SQLiteDatabase: android.database.sqlite.SQLiteException: table user has no column named updated_at (code 1): , while compiling: INSERT INTO user(uid,birthday,updated_at,email,status,name,created_at,gender) VALUES (?,?,?,?,?,?,?,?)

如果存在版本差异，表格似乎会被删除并重新创建我认为onUpgrade()接受了这一部分，但为什么我仍然收到该错误消息？

我还在我的设备上卸载了应用程序，在Android Studio上清理并重建了项目并重新运行了应用程序。
这也没有用。

Answer 1

你错过了一个逗号：

+ KEY_CREATED_AT + " TEXT"
+ KEY_UPDATED_AT + " TEXT"

必须是

+ KEY_CREATED_AT + " TEXT, "
+ KEY_UPDATED_AT + " TEXT"

然后卸载并重新安装您的应用程序（以便重新创建数据库）或者只是增加DATABASE_VERSION常量值（即：将其设置为3）。

Android SQLite：表用户没有名为

1 个答案: