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I just started to learn PDO and i read that in prepare statements you can use named parameters and question marks parameter. So which should i use, or they are completely the same and is just the matter of my decision which to use? Becuase i saw more people choose to use question mark parameters.
As a matter of fact, question marks produce dramatically shorter code.
Being not a novelist but programmer, I prefer concise code like this
$stm = $pdo->prepare("SELECT id FROM table WHERE name=? and pass=?");
$stm->execute(array($name,$pass));
$id = $stm->fetchColumn();
while named placeholders will require me to write every name a dozen times.
But anyway, it's indeed only a matter of personal preference.
You can use both, but using "named parameters" is (for obvious reasons) a lot easier, and more clear.
A good thing about named parameters is that you can see in your code what variable is inserted where in the query, and adding pieces of code (later on) is easier because everything has a name and is not depended on the order of the parameters.
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I want to which is, in your opinion, the best practice for name SQL columns.
Example: Let's say that i have two columns name referenceTransactionId and source
now there is another way to write this like refTxnId and src
which one is the better way and why? Is it because of the memory usage or because of the readability?
Although this is a matter of opinion, I am going to answer anyway. If you are going to design a new database, write out all the names completely. Why?
The name is unambiguous. You'll notice that sites such as Wikipedia spell out complete names, as do standards such as time zones ("America/New_York").
Using a standard like the complete name means that users don't have to "think" about what the column might be called.
Nowadays, people type much faster than they used to. For those that don't, type ahead and menus provide assistance.
Primary keys and foreign keys, to the extent possible, should have the same name. So, I suspect that referenceTransactionId should simply be transactionId if it is referencing the Transactions table.
This comes from the "friction" of using multiple databases and having to figure out what a column name is.
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I am deploying an application at one of our vendor. We have few special character that needs to be removed using a function. Vendor is really slow with any changes that we request.
I have access to one of the configuration table that we use to save configuration table.
I want to save a SQL function in the table column that I will fetch at run-time and will execute it.
I am not sure if its a good programming practice. Please suggest if this should not be used then why or is there any other way to do it?
Database is SQL Server. Suggest if it's a good programming practice.
A better practice would be to write your function in such a way that you don't have to change it every time a new special character pops up.
Instead of writing a function that filters out a predefined set of special characters, why don't you write a function that allows a predefined set of non-special characters? Then you should never have to change it.
you can use a Computed column in sql server, for me it's not a good practice depending on the scenario that you are trying to achieve but I think this might help you
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Can anyone articulate what the key differences are between SAS and SQL? I haven't worked much with SAS but went on a weeks training course, and basically it seemed like the equivalent but more convoluted and was able to do graphs.
Would appreciate some key bullet differences between them.
Standard SQL is a language to query, manipulate and define data in any(!) database. It is like the "latin language" of DB systems. Everyone knows it in order to perform standard tasks. SAS is like an extension to that with many functions.
I found a good document:
http://www.sascommunity.org/mwiki/images/5/52/CMSSUG-0506-SQL.pdf
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i'm wanting to write data into memory only for a temp time. the format is essentially the same as an sql table with say 5 columns and 1,000 rows, give or take. simply i want to store this data and run queries against it to make calculations, sorting it, querying it to then produce chart reports and excel data.
I looked at custom psobjects and then sql and i can't see why i'd use custom psobjects over sql, what do you think?
I also couldn't see that adding multiple rows as such, using psobjects was as straight forward as adding another row in sql.
thanks
steve
I guess it depends on what you're more comfortable with, but if you're going to do it in Powershell then using PS custom objects seems like a logical choice since the cmdlets were designed to work with those.
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What do you prefer to use and what is the best practice - to make long but very meaningful names or to make shorter ones?
For example, if you are writing a class House, will be
int numberOfRooms;
or
int nRooms;
Sure, long names are better for understandig when you read foreign code or give yours to somebody, but they make code longer -> more complicated to read. So I messed up with it. :)
One of the most important things is understanding code.
It's better to name the variable numberOfRooms or numOfRooms than nRooms - nRooms could mean something else and numOfRooms is just 4 characters longer - so, I think, it worths to name it a little longer.
Use the house naming style for wherever you are working. Other colleagues will be maintaining your code in the future and it is best to make it easy for them.
If you are working for yourself then use the standard naming style for the language you are using. Delphi, Java, C# and others all have standard styles.
If you are working on a collaborative project then follow the house naming style for that project.
As Miroslav says, longer names are generally better, within reason.