Question

我正在尝试创建SQLiteDatabase那个功能，以便在表不为null时保持用户登录，如果它为null，则活动将请求用户和密码，并且表首先有两行是Name，第二行是position。但我不知道为什么它会给我这个错误：

02-27 09:53:22.142 11519-11519/com.amaiub.hussain.smartmenu E/SQLiteLog: (1) no such table: User_Table
02-27 09:53:22.149 11519-11519/com.amaiub.hussain.smartmenu E/SQLiteDatabase: Error inserting user_position=admin user_name=hussain
                                                                              android.database.sqlite.SQLiteException: no such table: User_Table (code 1): , while compiling: INSERT INTO User_Table(user_position,user_name) VALUES (?,?)

我在数据库中创建了这个表

public class DatabaseHelper extends SQLiteOpenHelper {

    private final static String DB_NAME = "e-Order";
    private final static int DB_VERSION = 1;
    private final String USER_TABLE = "User_Table";


    private String USER="user_name",POSITION="user_position";

    public DatabaseHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub


        db.execSQL("CREATE TABLE '" + USER_TABLE + "'('" + USER + "'TEXT,'" + POSITION + "'TEXT)");


    }

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

        db.execSQL("DROP TABLE IF EXISTS '" + USER_TABLE + "'");

        onCreate(db);
    }
    public int logIn(String userName, String userPosition) {

        int result = 0;

        SQLiteDatabase db = getWritableDatabase();

        ContentValues cv = new ContentValues();
        cv.put(USER, userName);
        cv.put(POSITION, userPosition);

        result = (int) db.insert(USER_TABLE, null, cv);

        if (db != null)
            db.close();

        return result;
    }
    public int getUser() {

        int total = 0;

        SQLiteDatabase db = getReadableDatabase();

        Cursor cur = db.query(USER_TABLE, null, null, null, null, null, null);

        if (cur.getCount() > 0)
            total = cur.getCount();

        if (cur != null)
            cur.close();

        if (db != null)
            db.close();

        return total;

    }
    public int logOut() {
        int result = 0;

        SQLiteDatabase db = getWritableDatabase();

        result = db.delete(USER_TABLE, null, null);

        if (db != null)
            db.close();

        return result;
    }

并在登录活动中

@Override
                        public void onResponse(String response) {
                            try {
                                JSONObject jsonObject = new JSONObject(response);
                                if (jsonObject.names().get(0).equals("user")||jsonObject.names().get(0).equals("position")) {
                                    Toast.makeText(getApplicationContext(), "Welcome "+jsonObject.getString("position"), Toast.LENGTH_SHORT).show();
                                    user_name=jsonObject.getString("user");
                                    user_position=jsonObject.getString("position");
                                    if (user_name!=null||user_position!=null) {
                                        helper.logIn(user_name, user_position);

                                        finish();
                                        Intent intent = new Intent(getApplicationContext(), MainPage.class);
                                        intent.putExtra("user", user_name);
                                        intent.putExtra("position", user_position);

                                        startActivity(intent);
                                    }

                                } else {
                                    sign_in.setError("");
                                    Toast.makeText(getApplicationContext(), "Error" + jsonObject.getString("error"), Toast.LENGTH_SHORT).show();
                                    creatingAnime();
                                }

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


                        }

我不知道是什么问题

Answer 1

尝试使用以下查询：

"CREATE TABLE " + USER_TABLE + "(" + USER + " TEXT, " + POSITION + " TEXT )";

似乎需要在表创建时进行更正。这里看一下create table语法。 link

在进行上述更改和测试之前，不要忘记卸载以前的应用。

快乐编码......

Answer 2

您似乎在创建脚本db.execSQL("CREATE TABLE '" + USER_TABLE + "'('" + USER + "'TEXT,'" + POSITION + "'TEXT)");

中有一些错误

尝试在输入类似内容之前添加空格：

db.execSQL("CREATE TABLE " + USER_TABLE + " (" + USER + " TEXT, " + POSITION + " TEXT)");

Answer 3

这样做：

1º在值SQLiteDatabase db;

下添加

2º

 public void onCreate(SQLiteDatabase db) {
        String CREATE_CONTACTS_TABLE = "CREATE TABLE " + USER_TABLE + "("

                + USER + " TEXT,"
                + POSITION + " TEXT" + ")";
        db.execSQL(CREATE_CONTACTS_TABLE);
    }

E / SQLiteDatabase：插入错误

3 个答案: