java - How to insert date or NULL to array -


i have following question. i'm using jdbc in project , made simple method insert data database.

my problem is: when want insert sysdate or null auto increment? method send strings , writing null string doesn't work.

can give me advice how improve it?

this code constant null in query, isn't want to.

public static void insertinto(string table, arraylist<string> values) throws sqlexception {     connection conn = javaconnectdb.connectdb();     oraclepreparedstatement pst = null;         stringbuilder query = new stringbuilder("insert " + table + " values (null, ");      (int = 0; < values.size(); i++)     {         query.append("? ");         if (i + 1 != values.size())             query.append(", ");     }     query.append(")");      pst = (oraclepreparedstatement) conn.preparestatement(query.tostring());      (int = 0; < values.size(); i++)     {         pst.setstring(i + 1, values.get(i));     }      pst.executeupdate(); }

this method creates query "insert table values (null, ?, ? ,?)" , fills gaps values array.

there java.sql.preparedstatement.setnull(int, int)

try, e.g.

pst.setnull(1, types.bigint); (int = 1; < values.size(); i++) {     pst.setstring(i + 1, values.get(i)); }

change types.bigint apporpriate type column. note, values.get(0) ignored, should present in array.


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