To create a self-increasing field, it is first necessary that the type of column data be INTEGER.See the command below:CREATE TABLE [tabela] (
[ID] INTEGER PRIMARY KEY AUTOINCREMENT
);
To change a field to another type in the sqlite, so I researched it is not possible using an alter table > alter column command, it would be necessary to juggle creating a backup table, then recreating the main table, then repopulating the main table with the data that were recorded in the backup table.Or if you prefer, you can use a visual tool to change the ID field to AutoIncrement.I use the SQLite Expert Personal 4.x tool and it does it wonderfully well.Download: http://www.sqliteexpert.com/download.html
You can create a method that by calling the Gallery app using the Intent class. Create an onClick on your ImageView and call the image app by Intent.
Example:public void visualizarImagem(){
imageView.setOnClickListener (new OnClickListener(){
@Override
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri img = Uri.parse("file://" + caminhodafoto);
intent.setDataAndType(img, "imagem/*");
startActivity(intent);}
}
);
}
I think your code is too long, you could optimize it using it. index only together with one scope take a variable; for example:Controllerdef index
@orden = Producto.paginate(page: params[:page], per_page: 5).ordena(params[:sort].presence || "nombre")
end
params[:sort].presence || "nombre" what it does is pass the parameter sort alone. No. is empty (or void); if it is, then pass the value "nombre".Modelscope :ordena, -> (custom_sort) { order("#{custom_sort}") }
View<p>Ordenar por:</p>
<p>
<%= link_to "Nombre", productos_path(sort: "nombre") %>
- <%= link_to "Vistas", productos_path(sort: "visitas") %>
- <%= link_to "Precio", productos_path(sort: "precio") %>
- <%= link_to "Fecha de Creación", productos_path(sort: "created_at DESC") %>
</p>
Where productos_path refers to helper road for action index from your controller.
Paul,
The error happens because you are trying to make a select with a Boolean comparison. SQLite has no Boolean data type, but maps them as integers (true = 1 and false = 0), see the documentation: https://www.sqlite.org/datatype3.html So change your query as follows:SELECT p.codigo, p.nome, p.preco_padrao,
(coalesce((select sum(i.qtd) qtd
from tbl_item_compra i
inner join tbl_compra c on (c.codigo = i.chcompra)
where i.chproduto = p.codigo and
c.data_entrega >= CURRENT_DATE),0) -
coalesce((select sum(i.qtd) qtd
from tbl_item_venda i
inner join tbl_venda v on (v.codigo = i.chvenda)
where i.chproduto = p.codigo and
v.pedido = 0),0)) as qtd_estoque
FROM tbl_produto p
Looks like they're inserting the fields badly and you've got a point and a more coma at the end. It should be this way:sql = "INSERT INTO usuarios(Nombre,Apellidos) VALUES('"+ name + "','" + second + "')";
Although I recommend that you use Try/Catch and know your exception
You have a mistake on that line because you're already installing a MediaEscolar variable on line 33 and so in the cycle you should use another name. Try for example and see the result:for(MediaEscolar media : objectos){
Log.d( "Matéria : " + media.getMateria() + " Semestre : " + media.getBimestre() + " Media :" + media.getMediaFinal())
}
If the user's device is root it doesn't matter where you save the information because the user can access the database files or those of Shared preferences or any files that are stored in the App folders.Encryption is fundamental to the task you want to do to maintain the privacy of conversations. I would recommend you to use the Database for the storage of conversations, as you will find it easier to access the information you want and can store a large volume of data.WhattsApp for example but I'm mistaken uses Database, from which you're backing up every day and these copies are encrypted. If you enter with a file manager you can see within the folder Whatsapp a folder called Databases in which you can see the BD with the name msgstore.db.crypt12 and the backups with the name msgstore-year-month-dia.1.db.crypt12. Telegram and Facebook Messenger have not investigated how they manage this.I hope it helps you.
I would implement it using a reference counter:
CREATE TRIGGER new_in_b AFTER INSERT ON B
FOR EACH ROW
BEGIN
UPDATE A SET refcounter = refcounter + 1 WHERE id = new.foreignkey;
END;
CREATE TRIGGER remove_from_b AFTER DELETE ON B
FOR EACH ROW
BEGIN
UPDATE A SET refcounter = refcounter - 1 WHERE id = old.foreignkey;
DELETE FROM A WHERE id = old.foreignkey AND refcounter = 0;
END;
Code:INTEGER PRIMARY KEY AUTOINCREMENT
It's to increase. But eye that starts from 1 onwards.When it's true for a toastToast.makeText(this, "Dato ya Insertado", Toast.LENGTH_SHORT).show();
NSXMLParser can't help you - it's just a SAX-parser and can't pee in xml. To be honest, I didn't realize you wanted sqlite the same database and you don't have to swap it, it could be boldly used to use its api. (I don't know, IOS SDK, it's like libsqlite3.dlyb) or something like CoreData, if I had to move it directly from the building.
