冲刺！

昨天：画了增删改查的xml界面文件。

困难：listview绊了我一下。

今天：研究了Android SQLite数据库，初步定义了五个变量。增删改查也有了些眉目。

package com.example.zbytexttwo;

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

public class dbHelper extends SQLiteOpenHelper {
    public static final String TB_NAME = "bills";
    public dbHelper(Context context, String name, CursorFactory factory, int version) {
        super(context, name, factory, version);
        // TODO Auto-generated constructor stub
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE IF NOT EXISTS " +
                TB_NAME + " ( _id integer primary key autoincrement," +
                "leixing varchar," +
                "riqi varchar,"+
                "jine integer," +
                "beizhu varchar"+
                ") ");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + TB_NAME);
        onCreate(db);
    }
}