crud on java

++++++++++++ my function +++++++++++++
/**
     *
     * @param listcolumn
     * @param table
     * @param data
     * @param condition
     * @return
     * @throws java.sql.SQLException
     */
    public ArrayList<Map<String, Object>> loadData(String[] listcolumn, String table, String condition, String[] data) throws SQLException{
        ArrayList result = new ArrayList();
        try (Connection con = koneksi.getcon(true)) {
            String column = "";
            for(int i = 0; i < listcolumn.length; i++){
                if(listcolumn.length < 2){
                    column += listcolumn[i];
                }else if(i == (listcolumn.length-1)){
                    column += listcolumn[i];
                }else{
                    column += listcolumn[i]+", ";
                }
            }
            String sql = "SELECT "+ column +" FROM "+ table + " " + condition;
            PreparedStatement prep = con.prepareStatement(sql);
            if(data.length >= 1){
                int i = 1;
                for(String dt : data){
                    prep.setString(i, dt);
                    i++;
                }
            }
            ResultSet reset =  prep.executeQuery();
            while(reset.next()){
                Map<String, Object> map = new HashMap<>();
                for( String clmn : listcolumn){
                    if(clmn.contains(".")){
                        String[] clm = clmn.split("[.]");
                        map.put(clm[1], reset.getObject(clm[1]));
                    }else{
                        map.put(clmn, reset.getObject(clmn));
                    }
                }
                result.add(map);
            }
            con.close();
        }
        return result;
    }
public void insertData(String table, Map<String, Object> data){
try{
// get key from data Map
try (// call connectino from class koneksi
Connection con = koneksi.getcon()) {
// get key from data Map
Set<String> keys = data.keySet();
String keyQuery = "", valueQuery = "", sql;
// set query from key for build query.
if (keys != null){
keyQuery += "( ";
int x = 0;
for (String key : keys) {
if(x > 0){
keyQuery += ","+key+" ";
}else{
keyQuery += key+" ";
}
x++;
}
keyQuery += ")";
// count how many value from data
valueQuery += "( ";
for (int i = 0; i < data.size(); i++) {
if(i > 0){
valueQuery += ",? ";
}else{
valueQuery += "? ";
}
}
valueQuery += ")";
}
// generate and execute query
if(!"".equals(keyQuery) && !"".equals(valueQuery)){
sql = "INSERT INTO "+ table+ " " + keyQuery + " VALUES " + valueQuery;
PreparedStatement prep;
prep = con.prepareStatement(sql);
int index = 1;
for (String key : keys) {
prep.setObject(index, data.get(key));
index++;
}
prep.executeUpdate();
prep.close();
con.close();
}
}
}catch(Exception e){
}
}
++++++++++ use function +++++++++++
for(Map<String, Object> dataDetail : dataDiagnosa){
dataDetail.remove("no");
final Query queryDetail = new Query();
queryDetail.insertData("tb_detail_history_diagnosa", dataDetail);
}