Android(安卓)创建DBHelper类
16lz
2021-12-18
public class DBHelper extends SQLiteOpenHelper { private static int mVersion = 1; private static String name = "apps.db"; public DBHelper(Context context) { super(context, name, null, mVersion); } @Override public void onCreate(SQLiteDatabase db) { String sql = "create table book(_id int primary key autoincrememt, name varchar(32) ,price double , publishtime date)"; db.execSQL(sql); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { String sql = "DROP TABLE IF EXISTS book"; db.execSQL(sql); this.onCreate(db); }}
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