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OO Design in Rails: Where to put stuff
...e huge ActiveRecord subclasses and huge controllers is quite natural (even if you do use a controller per resource). If you were to create deeper object worlds, where would you put the classes (and modules, I suppose)? I'm asking about views (in the Helpers themselves?), controllers and models.
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SQL Server SELECT into existing table
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SELECT ... INTO ... only works if the table specified in the INTO clause does not exist - otherwise, you have to use:
INSERT INTO dbo.TABLETWO
SELECT col1, col2
FROM dbo.TABLEONE
WHERE col3 LIKE @search_key
This assumes there's only two columns in db...
Can I convert long to int?
...is the compiler default). It'll throw OverflowException in checked context if the value doesn't fit in an int:
int myIntValue = unchecked((int)myLongValue);
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MYSQL import data from csv using LOAD DATA INFILE
... just a note that the (col1, col2, col3....) is not required. Useful if you are creating a table on the fly before using this to insert data.
– Kieran Quinn
Mar 4 '19 at 14:16
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How to echo shell commands as they are executed
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If you also want to see which numbered line is being executed see stackoverflow.com/a/17805088/1729501
– user13107
Apr 19 '18 at 6:52
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How to get JSON response from http.Get
...rl string, target interface{}) error {
r, err := myClient.Get(url)
if err != nil {
return err
}
defer r.Body.Close()
return json.NewDecoder(r.Body).Decode(target)
}
Example use:
type Foo struct {
Bar string
}
func main() {
foo1 := new(Foo) // or &Foo{}
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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...om this answer which also contains a step-by-step MySQL+JDBC tutorial:
If you get a SQLException: Connection refused or Connection timed out or a MySQL specific CommunicationsException:
Communications link failure, then it means that the DB isn't reachable at all. This can have one or more of...
Pick a random element from an array
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Swift 4.2 and above
The new recommended approach is a built-in method on the Collection protocol: randomElement(). It returns an optional to avoid the empty case I assumed against previously.
let array = ["Frodo", "Sam", "Wis...
Is there a way to add/remove several classes in one single instruction with classList?
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And if you want to apply an Array of several class-names, you have to call: DOMTokenList.prototype.add.apply(elem.classList, ['first', 'second', 'third']);
– Emanuel Kluge
Feb 15 '13 at 16:...
How to check if smtp is working from commandline (Linux) [closed]
... You should wait for the servers's response to each command, and abort if you get and error (4xx or 5xx result code).
– tripleee
Aug 16 '12 at 14:01
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