asp.net - How to replace variable in where clause in c# -


i have oracle query fetch data database , show them in gridview dynamically.the query used select *from employee location=?location , age=?age , marks=?marks .variable beginning ? placeholders filled @ runtime.suppose here extracted place holders selecting drop down , got location='chemmad' , marks='100'.i need logic insert values created in place holders , if thing miss example here age missing, have capture missing one.in nutshell have query dropdown like

string query = "select *from employee location=?location , age=?age , marks=?marks";

i got values @ runtime place holders 

string values = "location='chemmad' ,  marks='100'";

so want replace values placeholders , same time need find missing 1 here age

**edit**

i stored combinations of queries in oracle database :) , fetching @ run time , replacing values.i think have find location of = sign , need find words either side??

string strvalues = "location='chemmad' ,  marks='100'"; // bad , cause sql injection attacks. // want object(s) can use in parameterized query. depending on input dynamically create part of string. this: var parametervalues = new {     location = "chemmad",     marks = 100 };   const string searchterm = " "; var query = @"select * employee location=?location , age=?age , marks=?marks"; var part1 = query.substring(0, query.indexof(searchterm, stringcomparison.ordinalignorecase)); // following line not necessary , won't used. illustrates how remainder of query. var part2 = query.substring(query.indexof(searchterm, stringcomparison.ordinalignorecase) + searchterm.length, query.length - part1.length - searchterm.length);  var mydynamicquery = part1 + searchterm; mydynamicquery = mydynamicquery + "location = :location "; mydynamicquery = mydynamicquery + "and marks = :marks ";

mydynamicquery contains string: select * employee location = :location , marks = :marks

next

  1. create oracle connection
  2. create dbparameters
  3. execute query against oracle command object

see this article how create oracle connection .net , use parameterized query.


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