Question

我犯了错误？

当我尝试将数据插入数据库时，我收到了Toast我插入的消息，但在LOG文件中我看到错误：

没有这样的表：预订（代码1）:,同时编译：INSERT INTO预订（电话，地址，姓氏，姓名，开始，目的地）VALUES（？，？，？，？，？，？）在android.database.sqlite.SQLiteConnection.nativePrepareStatement（本机方法）

DBHelper.java

package com.example.demir.carsharing;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.TextView;


public class DbHelper extends SQLiteOpenHelper {
    public static final String TAG = DbHelper.class.getSimpleName();
    public static final String DB_NAME = "carsharing.db";
    public static final int DB_VERSION = 1;

    public static final String USER_TABLE = "users";
    public static final String COLUMN_ID = "_id";
    public static final String COLUMN_EMAIL = "email";
    public static final String COLUMN_PASS = "password";

    public static final String RES_TABLE="reservation";
    public static final String COLUMN_NAME="name";
    public static final String COLUMN_SURNAME="surname";
    public static final String COLUMN_ADDRESS="address";
    public static final String COLUMN_PHONE="phone";
    public static final String COLUMN_START="start";
    public static final String COLUMN_DESTINATION="destination";


    /*
 create table users(
     id integer primary key autoincrement,
     email text,
     password text);
  */
    public static final String CREATE_TABLE_USERS = "CREATE TABLE " + USER_TABLE + "("
            + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
            + COLUMN_EMAIL + " TEXT,"
            + COLUMN_PASS + " TEXT);";

    public static final String CREATE_TABLE_RESERVATION = "CREATE TABLE " + RES_TABLE + "("
            + COLUMN_NAME + " TEXT,"
            + COLUMN_SURNAME + " TEXT,"
            + COLUMN_ADDRESS + " TEXT,"
            + COLUMN_PHONE + " TEXT,"
            + COLUMN_START + " TEXT,"
            + COLUMN_DESTINATION + " TEXT);";


    public DbHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE_USERS);
        db.execSQL(CREATE_TABLE_RESERVATION);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXIST" + USER_TABLE);
        onCreate(db);

        db.execSQL("DROP TABLE IF EXIST" + RES_TABLE);
        onCreate(db);
    }


    public void addUser(String email, String password) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(COLUMN_EMAIL, email);
        values.put(COLUMN_PASS, password);

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

        Log.d(TAG, "user inserted" + id);
    }

    public boolean getUser(String email, String pass) {
        //HashMap<String, String> user = new HashMap<String, String>();
        String selectQuery = "select * from  " + USER_TABLE + " where " +
                COLUMN_EMAIL + " = " + "'" + email + "'" + " and " + COLUMN_PASS + " = " + "'" + pass + "'";

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        // Move to first row
        cursor.moveToFirst();
        if (cursor.getCount() > 0) {

            return true;
        }
        cursor.close();
        db.close();

        return false;
    }


    // method for  inserting data from method reservation
    public void addReservation(String name, String surname, String address, String phone, String start, String destination) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, name);
        values.put(COLUMN_SURNAME, surname);
        values.put(COLUMN_ADDRESS, address);
        values.put(COLUMN_PHONE, phone);
        values.put(COLUMN_START, start);
        values.put(COLUMN_DESTINATION, destination);

        long a = db.insert(RES_TABLE, null, values);
        db.close();

        Log.e(TAG, "Data insetred" + a);
    }


    //Get data from Reservation
    public boolean getData(String name, String surname, String address, String phone, String start, String destination) {
        String query = "select * from  " + RES_TABLE + " where " +
                COLUMN_NAME + " = " + "'" + name + "'" + " , " + COLUMN_SURNAME + " = " + "'" + surname + "'" +
                COLUMN_ADDRESS + " = " + "'" + address + "'" + " , " + COLUMN_PHONE + " = " + "'" + phone + "'" +
                COLUMN_START + " = " + "'" + start + "'" + " , " + COLUMN_DESTINATION + " = " + "'" + destination + "'";

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(query, null);
        // Move to first row
        cursor.moveToFirst();
        if (cursor.getCount() > 0) {

            return true;
        }
        cursor.close();
        db.close();

        return false;
    }

    //insert data iinto Reservation
    public boolean insertReservation(String name, String surname, String address, String phone, String start, String destination) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put("name",name);
        contentValues.put("surname",surname);
        contentValues.put("address",address);
        contentValues.put("phone",phone);
        contentValues.put("start",start);
        contentValues.put("destination",destination);
        db.insert("reservation",null,contentValues);
        return true;

    }
}

Reservation.java

package com.example.demir.carsharing;

import android.content.Intent;
import android.database.SQLException;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import static com.example.demir.carsharing.R.id.etName;

public class ReservationActivity extends AppCompatActivity {
    private Button save;
    private EditText name, surname, address, phone, start, destination;
    private DbHelper db;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reservation);

        db = new DbHelper(this);
        name = (EditText) findViewById(etName);
        surname = (EditText) findViewById(R.id.etSurname);
        address = (EditText) findViewById(R.id.etAddress);
        phone = (EditText) findViewById(R.id.etPhone);
        start = (EditText) findViewById(R.id.etStart);
        destination = (EditText) findViewById(R.id.etDestination);
        save = (Button) findViewById(R.id.btnSave);
        AddData();

    }

    public void AddData(){
        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
             boolean isInserted = db.insertReservation(name.getText().toString(),
                        surname.getText().toString(),
                        address.getText().toString(),
                        phone.getText().toString(),
                        start.getText().toString(),
                        destination.getText().toString());
                if(isInserted==true)
                    Toast.makeText(ReservationActivity.this,"Data inserted",Toast.LENGTH_LONG).show();
                    else
                    Toast.makeText(ReservationActivity.this,"Data not inserted",Toast.LENGTH_LONG).show();
            }
        });
    }

}

Answer 1

首次创建表后，您可能已经对助手类进行了更改，在这种情况下，您必须在重新运行之前清除应用程序的数据，在设备/模拟器中转到应用程序信息和清除数据＆＃34; for＆gt; = Marshmallow转到App Info - ＆gt;存储 - ＆gt;清除数据＆＃34; 您不必删除并重新安装整个应用程序。这将是浪费时间。

SQLiteException：没有这样的表Android Studio

1 个答案: