解释代码public class MyDatabaseHelper extends SQLiteOpenHelper { public static String CREATE_PATIENT = "create table Patient(" + "id integer primary key," + "password text not null," + "phone integer not null," + "name text," + "gender text," + "age integer," + "doctor_id integer," + "alarm bool)"; public static String CREATE_DOCTOR = "create table Doctor(" + "doctor_id integer primary key," + "password text not null," + "phone integer not null)"; private Context mContext; public MyDatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version){ super(context, name, factory, version); mContext = context; } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(CREATE_PATIENT); db.execSQL(CREATE_DOCTOR); ToastUtil.showMsg(mContext, "Create succeeded!"); } @Override public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) { } }
时间: 2023-06-26 11:09:59 浏览: 112
SQLHelper代码详解
这段代码是一个SQLite数据库操作的辅助类,用于创建和管理数据库。它继承了SQLiteOpenHelper类,并重写了onCreate()和onUpgrade()方法来创建和更新数据库。
其中CREATE_PATIENT和CREATE_DOCTOR是两个SQL语句,用于在数据库中创建两个表格。每个表格有不同的列,如Patient表格包括id、password、phone、name、gender、age、doctor_id和alarm列,而Doctor表格只包括doctor_id、password和phone列。
在构造函数中,传入了一个Context对象、数据库名称、CursorFactory对象和版本号。重写的onCreate()方法中执行了两个SQL语句,创建了两个表格,并使用ToastUtil类显示了一个消息。
如果需要在数据库版本更新时执行一些操作,可以在onUpgrade()方法中添加相应的代码。
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