java - jdbc code to update informations in a mysql table -


i have code in java-eclipse update informations in table mysql values in selected row of table didnt update after running function.for example want replace value "b" inested of "a" in column "username" please me :(

a first value b value want replace username name of 1 column code:

   public void change("username","a","b") throws sqlexception{         prs=connect.preparestatement( "update user0 set " +s1+ "='" +s3+ "' '" +s1+ "'='" + s2+"'");         prs.execute();           }// end of function change

that shouldn't compile, syntax wrong:

public void change(string username, string a, string b) throws sqlexception{...}

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