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Common MySQL fields and their appropriate data types
... |
| salt | CHAR(x) | randomly generated string, usually of
fixed length (x)
| digest (md5) | CHAR(32) | |
| phone number | VAR...
App Inventor 2 中的响应式设计 · App Inventor 2 中文网
...een width as 600 and the button width as 300. As a result, you have the extra resolution to work with in your app design for the tablet.
It’s also possible to take mixed approaches. These can be more confusing and less useful, and we recommend that you use them only in special circumstances. ...
What is a Maven artifact?
...n name, like com.example.foo), an artifact ID (just a name), and a version string. The three together uniquely identify the artifact.
A project's dependencies are specified as artifacts.
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Rails migration: t.references with alternative name?
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You can do it this way:
create_table :courses do |t|
t.string :name
t.references :transferrable_as
t.references :same_as
t.timestamps
end
or using t.belongs_to as an alias for t.references
You can't add foreign_key: true to those two references lines. If you want to mark t...
Android: Coloring part of a string using TextView.setText()?
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Use spans.
Example:
final SpannableStringBuilder sb = new SpannableStringBuilder("your text here");
// Span to set text color to some RGB value
final ForegroundColorSpan fcs = new ForegroundColorSpan(Color.rgb(158, 158, 158));
// Span to make text bold
fina...
Spring DAO vs Spring ORM vs Spring JDBC
...rst, last from person where id=?",
rs -> new Person(rs.getString(1), rs.getString(2)),
134561351656L);
Spring-JDBC also provides a JdbcDaoSupport, that you can extend to develop your DAO. It basically defines 2 properties: a DataSource and a JdbcTemplate that both ca...
Rails: Adding an index after adding column
...g technique may be helpful:
rails generate migration AddIndexToUsers name:string:index will generate the following migration:
class AddIndexToUsers < ActiveRecord::Migration
def change
add_column :users, :name, :string
add_index :users, :name
end
end
Delete add_column line and run...
Constructors in JavaScript objects
... this.set_name = function (value) {
if (typeof value != 'string')
throw 'Name must be a string';
if (value.length < 2 || value.length > 20)
throw 'Name must be 2-20 characters long.';
name = value;
};
};
...
Why don't structs support inheritance?
...Basically, they're supposed to hold simple data and therefore do not have "extra features" such as inheritance. It would probably be technically possible for them to support some limited kind of inheritance (not polymorphism, due to them being on the stack), but I believe it is also a design choice ...
How to remove padding around buttons in Android?
...id:insetTop="0dp"
android:insetBottom="0dp"
android:text="@string/view_video"
android:textColor="@color/white"/>
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