十日冲刺（第二阶段）

一、说在前面

　　今天又看了看我们项目数据库的结构，整理一下数据库里面的结构将其封装的更加清晰方便后期更好的更新。

二、完成情况

　　代码：

package com.example.myapplicationgb;


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

import androidx.annotation.Nullable;

public class DatabaseHelper extends SQLiteOpenHelper {

    public static final String COST_MONEY = "cost_money";
    public static final String COST_DATE = "cost_date";
    public static final String COST_TITLE = "cost_title";
    public static final String FAMILY_BILL = "family_bill";

    public DatabaseHelper(@Nullable Context context) {
        super(context, "family_bill", null, 2);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table if not exists family_bill(" +
                "id integer primary key, " +
                "cost_title varchar, "+
                "cost_date varchar, "+
                "cost_money varchar)");
    }

    public void insertCost(CostBean costBean){
        SQLiteDatabase database = getWritableDatabase();
        ContentValues cv = new ContentValues();
        cv.put(COST_TITLE,costBean.costTitle);
        cv.put(COST_DATE,costBean.costDate);
        cv.put(COST_MONEY,costBean.costMoney);
        database.insert(FAMILY_BILL,null,cv);
    }

    public Cursor getAllCostData(){
        SQLiteDatabase database = getWritableDatabase();
        return database.query(FAMILY_BILL,null,null,null,null,null,"COST_DATE ASC");
    }

    public void deleteOne(CostBean costBean)
    {
        SQLiteDatabase database=getWritableDatabase();
        database.delete(FAMILY_BILL,"COST_TITLE = ? and COST_MONEY = ? and COST_DATE = ?", new String[]{""+costBean.costTitle,""+costBean.costMoney,""+costBean.costDate});
    }

    public void deleteAllData(){
        SQLiteDatabase database = getWritableDatabase();
        database.delete(FAMILY_BILL,null,null);
    }

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

    }


    public  int countTotalCost(){
        int sum=0;
        SQLiteDatabase database=getWritableDatabase();
        String sum_dbString="select sum(cost_money)from "+FAMILY_BILL;
        Cursor cursor=database.rawQuery(sum_dbString,null);
        if (cursor!=null){
            if (cursor.moveToFirst()){
                do{
                    sum=cursor.getInt(0);
                }while (cursor.moveToNext());
            }
        }
        return sum;
    }

    public  Cursor selectlist(String s){
        SQLiteDatabase database =getWritableDatabase();
//        String sql = "select * from "+ FAMILY_BILL +"where cost_date = '%"+s+"%' ";
//        database.execSQL(sql);
//        database.close();
        return database.query(FAMILY_BILL,null,"cost_date LIKE ?",new String[]{"%"+s+"%"},null,null,"COST_DATE ASC");
    }

}