问题描述
/*public class TanngoBaseHelper extends SQLiteOpenHelper {
private static final int VERSION = 1;private static final String DATABASE_NAME = 'tanngoBase.db';public TanngoBaseHelper(Context context) { super(context, DATABASE_NAME, null, VERSION);}@Overridepublic void onCreate(SQLiteDatabase db) { db.execSQL('create table' + TanngoTable.NAME + '(' + ' _id integer primary key autoincrement,' + TanngoTable.Columns.UUID + ',' + TanngoTable.Columns.WORD + ',' + TanngoTable.Columns.MEAN + ',' + TanngoTable.Columns.DATE + ',' + TanngoTable.Columns.SOLVED + ')' );}@Overridepublic void nUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}*/public class TanngoBaseHelper extends SQLiteOpenHelper {
private static final int VERSION = 2;private static final String DATABASE_NAME = 'tanngoBase.db';public TanngoBaseHelper(Context context) { super(context, DATABASE_NAME, null, VERSION);}@Overridepublic void onCreate(SQLiteDatabase db) { db.execSQL('create table ' + TanngoTable.NAME + '(' + ' _id integer primary key autoincrement, ' + TanngoTable.Columns.UUID + ', ' + TanngoTable.Columns.WORD + ', ' + TanngoTable.Columns.MEAN + ', ' + TanngoTable.Columns.DATE + ', ' + TanngoTable.Columns.SOLVED + ')' );}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}
问题解答
回答1：那个VERSION标识了当前数据库版本，可以在onUpgrade中进行数据库字段的修改和扩充。
回答2：VERSION代表了数据库的版本，在更新数据库的时候发生改变。 可能会有软件版本不同 他们的数据库版本也是不同的，数据库里的字段也是不同的
