有无大佬可以看看为什么我往sqlite数据库写不了数据

Question

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private MyDatabaseHelper dbHelper;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dbHelper=new MyDatabaseHelper(this,"BookStore.db",null,1);
        Button createDatabase =(Button)findViewById(R.id.create_database);
        createDatabase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SQLiteDatabase db=dbHelper.getWritableDatabase();
                ContentValues values=new ContentValues();
                values.put("name","The Da Vinic Code");
                values.put("price",20);
                values.put("page",600);
                values.put("author","Scott");
                db.insert("Book",null,values);
            }
        });
    }
}

MyDatabaseHelper.java

package com.androidcourse.test71;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;

import androidx.annotation.Nullable;

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public MyDatabaseHelper(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
        this.context=context;
    }

    public static final String CREATE_BOOK="create table Book("+
            "id integer primary key autoincrement,"+
            "name text,"+
            "price float,"+
            "page integer,"+
            "author text);";

    private  Context context;

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_BOOK);
        Toast.makeText(context,"Create succeed",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

 

 

Answer 1

这个有顶的功能吗