没有这样的表 SQLite 错误：电子邮件 [重复]

Question

错误：03-26 23:19:58.913 12137-12137/com.example.johnwalls.projet E/SQLiteLog：（1）没有这样的表：email1 03-26 23:19:58.913 12137-12137/com.example.johnwalls.projet E/SQLiteDatabase: 插入错误 dem=hdhdhbbdbdjd description=demande source=bechir@gmail.com

inboxFrgment.java

package com.example.johnwalls.projet;


import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import static com.example.johnwalls.projet.R.id.pr;


/**
 * A simple {@link Fragment} subclass.
 */
public class InboxFragment extends Fragment {



    private Button sendB;
    private  EditText d;
    private EditText des;
    private DB base;
    public InboxFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
       base=new DB(getActivity());
       final View view = inflater.inflate(R.layout.fragment_inbox, container, false);

        TextView text2 =  view.findViewById(R.id.in);//Find textview Id

        String getArgument = getArguments().getString("main");
        text2.setText(getArgument);


        Button button = (Button) view.findViewById(R.id.log);
        button.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {


                String getArgument = getArguments().getString("main");

                EditText d= (EditText) view.findViewById(R.id.dem);
                EditText des=(EditText) view.findViewById(R.id.desc);

                String dem=d.getText().toString();
                String desc=des.getText().toString();


                Email e=new Email();

                e.setSource(getArgument);
                e.setDem(dem);
                e.setDescription(desc);
                base.insertEmail(e);
                Toast.makeText(getActivity(), "Email Envoyé", Toast.LENGTH_SHORT).show();


            }
        });


        return view;
    }

    }

DB.java

package com.example.johnwalls.projet;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabaseCorruptException;
import android.database.sqlite.SQLiteOpenHelper;

/**
 * Created by John Walls on 04-Mar-18.
 */

public class DB extends SQLiteOpenHelper {

    private static final int DATABASE_VERSION=1;
    private static final String DB_nom="bef.db";
    private static final String table_admin="admin";
    private static final String table_email1="email1";
    private static final String col_source="source";
    private static final String col_description="description";
    private static final String col_dem="dem";


    private static final String col_cin="cin";
    private static final String col_nom="nom";
    private static final String col_pren="pren";
    private static final String col_email="email";
    private static final String col_password="password";
    private static final String col_age="age";
    SQLiteDatabase db;
    private static final String creation_admin="create table admin (cin integer primary key,"+"nom text not null ,pren text not null ,email text not null,password text not null ,age integer not null);";

    private static final String creation_email="create table email1 (source text primary key,"+"dem text not null ,description text not null);";

    public DB(Context context) {
        super(context,DB_nom, null,DATABASE_VERSION);

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(creation_admin);
        db.execSQL(creation_email);
        this.db=db;
    }


    public void insertEmail(Email e)
    {
        db=this.getWritableDatabase();
        ContentValues values=new ContentValues();
        values.put(col_source,e.getSource());
        values.put(col_dem,e.getDem());
        values.put(col_description,e.getDescription());
        db.insert(table_email1,null,values);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String query ="DROP TABLE IF EXISTS "+table_admin;
        String query2="DROP TABLE IF EXISTS "+table_email1;
        db.execSQL(query);
        db.execSQL(query2);
        this.onCreate(db);
    }
}

你试图达到什么你期望得到什么你得到了什么（包括错误消息）你还尝试了什么？你认为是什么原因造成的？为什么你需要为它提出一个新问题？为什么您的问题与此处的其他类似问题不同？

Answer 1

我怀疑您在运行应用程序后添加了 email1 表，并且由于常见的误解是数据库助手的 onCreate每当您创建数据库助手的实例（SQLiteOpenHelper 的子类，即 DB.java）时，该方法就会运行。

'onCreate' 方法只在创建数据库时运行一次。

您可以通过三个选项来解决此问题：-

1. 删除应用程序的数据，然后重新运行应用程序。

2. 卸载应用程序并重新运行应用程序。

3. 在您的情况下，onUpgrade 方法将删除表然后调用onCreate，以增加数据库版本号（例如将private static final int DATABASE_VERSION=1; 更改为private static final int DATABASE_VERSION=2;）然后重新运行应用程序。