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PDF files, browse Downloads, Manuals & Support information. Non-commercial license enables you to use this software on any number of computers within the office .Q:

SQL Foreign Key Enforce

I’m looking for the right way to enforce that a database won’t insert a row unless I explicitly tell it that there is a foreign key constraint between these two tables.
Currently I’m using a trigger that I wrote when insert data to the table which contains the foreign key. So first I check to make sure that there is no row in this other table, then I insert the row.
Is this a good way of doing this? Does the dbms support a something like check constraint that automatically enforces this rule?

If you’re using MySQL, you could rely on the INFORMATION_SCHEMA as described in this answer:

Otherwise, based on your description, the solution is to use a BEFORE INSERT TRIGGER.

Passing string which is not null or empty

Now this is a somewhat “traditional” way of trying to pass a string to a function.
In a given function, I need to be able to accept a string. I don’t want to accept an empty string but I don’t want to accept null either because if I pass null to a function, the function will return the default value “”. Is there anyway of setting this up better?
public void OnLoad(object sender, EventArgs args)
{
MyFunction(args.ToString());
}

I’m not worried about what this function does, just that it accepts a string.

You can use one of the overloads of Paramaterized.
// A string was passed in
MyFunction(“A string was passed in”);

// A nullable string was passed in
MyFunction(default(string))

// A string was passed in, and is not null or an empty string
MyFunction(“A string was passed in”, “A string was passed in”);

// A string was passed in
MyFunction(“A string was passed in”);

class Program
{
static void Main(string[]

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PRO100 5.20 Professional Library WORK 💓

PRO100 5.20 Professional Library WORK 💓

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