2021.3.5

搭建数据库，创建DBHelper类，在Java里新建一个class，命名DBHelper

package com.example.myaccountapp;

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

import androidx.annotation.Nullable;

public class DBHelper extends SQLiteOpenHelper {

private static int DB_VERSION = 1;
private static String DB_NAME = "account_daily.db";

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

@Override
public void onCreate(SQLiteDatabase db) {
String sql="create table account(_id integer primary key autoincrement," +//主键
"Title varchar(20)," +//Title
"Date varchar(20)," +//Date
"Money vaechar(20))";//Money
db.execSQL(sql);
}

@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

}
}