sql server - Unused sql parameters - are they of any harm? -

-

consider following code:

dim sql = "select * mytable value1 = @param1"  if somecondition    sql = sql + " , value2 = @param2" end if  dim cmd new sqlcommand(sql, conn) cmd.parameters.addwithvalue("@param1", param1value) cmd.parameters.addwithvalue("@param2", param2value)

assuming built complex sql statement dynamically may or may not have included @param2 parameter - there harm in adding command parameter?

my real use-case far more complicated this, in general, pattern should avoid; , if so, why?

the point take note fact if call .addwithvalue, leave sql server figure out data type of parameter be.

sql server remarkably job of guessing - sometimes, gets "sub-optimally" , helpful provide details.

so tend use snippet of code:

sqlparameter aparam = new sqlparameter("@param1", sqldbtype.varchar, 50); aparam.value = param1value;

this has 2 main benefits:

  • you define explicit type, important e.g. when using varchar vs. nvarchar (otherwise might incur lots of unnecessary type conversions)
  • you define max length of e.g. string parameters

you wrap in e.g. static helper class, or use extension method.

it's tad more work, more control, , might avoid unnecessary, time-consuming datatype conversions , other unexpected side effects if leave sql server guess types.


Comments

Post a Comment

Popular posts from this blog

c++ - Convert big endian to little endian when reading from a binary file -

-
this question has answer here: how convert between big-endian , little-endian values in c++? 28 answers i've been looking around how convert big-endian little-endians. didn't find solve problem. seem there's many way can conversion. anyway following code works ok in big-endian system. how should write conversion function work on little-endian system well? this homework, since systems @ school running big-endian system. it's got curious , wanted make work on home computer also #include <iostream> #include <fstream> using namespace std; int main() { ifstream file; file.open("file.bin", ios::in | ios::binary); if(!file) cerr << "not able read" << endl; else { cout << "opened" << endl; int i_var; double d_var; while(!file.eof()) {...
Read more

C#: Application without a window or taskbar item (background app) that can still use Console.WriteLine() -

-
i'm trying create application adheres following: no taskbar no console or form window can utilize console.writeline() . (i.e. if executes app command prompt write console.) the problem if create windows form (or wpf) application can have there no taskbar, console or window show up, console.writeline() nothing. if create console app, writes console, can't figure out how hide (and if did hide it, write command prompt window?)... how do this? just create standard console application. callers responsibility hide window caused program (from how run c# console application console hidden ): system.diagnostics.processstartinfo start = new system.diagnostics.processstartinfo(); start.filename = dir + @"\myprocesstostart.exe"; start.windowstyle = system.diagnostics.processwindowstyle.hidden;
Read more

unicode - Are email addresses allowed to contain non-alphanumeric characters? -

-
i'm building website using `django. website have significant users non-english speaking countries. i want know if there technical restrictions on types of characters email address contain. are email addresses allowed contain english alphabets, numbers, "_", "@" , "."? are allowed contain non-english alphabets "é" or "ü"? are allowed contain chinese or japanese or other unicode characters? email address consists of 2 parts local before @ , domain goes after. rules these parts different: for local part can use ascii: latin letters - z - z digits 0 - 9 special characters !#$%&'*+-/=?^_`{|}~ dot ., not first or last, , not in sequence space , "(),:;<>@[] characters allowed restrictions (they allowed inside quoted string, backslash or double-quote must preceded backslash) plus since 2012 can use international characters above u+007f , encoded as utf-8 . domain part more res...
Read more