JDBCTemplate : either Update or Insert if ID doesn't exist

Question

Please see below the method which i used for updating a field in the table,
and now i have a condition if Id exists in the table then update the relative field otherwise insert a new record in the table.

1. Update if id exists

2. Insert a new record if id doesn't exist in table

Is there any way to do so via batch update which fulfils both condition or any other way as i have to deal with hundreds of row altogether.

public void updateTable(List<TestClass> testList){

String UPDATE_ITEM_ARTICLENO = "UPDATE itemTable SET articleno=? WHERE itemId=?";

jdbcTemplate.batchUpdate(UPDATE_ITEM_ARTICLENO, new BatchPreparedStatementSetter() {         
    @Override
    public void setValues(PreparedStatement ps, int i) throws SQLException {
        TestClass article = testList.get(i);            
        ps.setString(1, article.getItemId());
        ps.setString(2, article.getArticleno());            
    }        
    @Override
    public int getBatchSize() {
        return testList.size();
    }
  });
 }

Answer 1

There's a standard Merge (SQL) statement. But not all RDBMS's support it. Some of them have alternatives.