SQL Server injection

New to web development and taking over someones code. They have a function to prevent sql injection, for SQL Server database

function safe(val, maxsize)
   dim i,
   terms = array(
      "cast",
      "select",
      "varchar",
      "declare",
      "drop",
      ";",
      "--",
      "insert",
      "delete",
      "xp_"
   )
   val = left(val,maxsize)
   val = trim(val)
   for i = 0 to ubound(term开发者_开发百科s)
      val = replace(val, terms(i), "e_" & val & "_e", vbTextCompare)
   next
   val = replace(val, "'", "''")
   makesafe = val
end function

Hesitant to touch this, but is this missing anything? Seems occasionally they get hacked

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following article should help :

http://tugberkugurlu.com/archive/sql-injection-vs-lethal-injection-protection-against-sql-injection

It is not good idea to go down this path with string.Replace

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I would completely scrap that function and start using a parameterized statement like Aaron mentioned in his comment. If you haven't done so before, there are various articles on how to do so. In the article I linked you to, look at step 2.

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I would not rely on such a function to prevent sql injection attacks. Parameterized queries are a must. There are almost surely some injection texts you will miss using the approach of the method you listed.