/Java/Java code to compare csv file against a table

Java code to compare csv file against a table

HashMap<String, String> f1 = new HashMap<String, String>();
HashMap<String, String> f2 = new HashMap<String, String>();
// read f1, f2; use PK field as the key
List<String> deleted = new ArrayList<String>();
List<String> updated = new ArrayList<String>();
for(Map.Entry<String, String> entry : f1.keySet()) {
    if(!f2.containsKey(entry.getKey()) {
        deleted.add(entry.getValue());
    } else {
        if(!f2.get(entry.getKey().equals(f1.getValue())) {
            updated.add(f1.getValue());
        }
    }
}
for(String key : f1.keySet()) {
    f2.remove(key);
}
// f2 now contains only "new" rows

Source: stackoverflow.com

Similar codes

0 vote198 views1 answer
Linearview 2 items next to each other
Java
3 votes237 views3 answers
Java initialize map with values in one line
Java
0 vote213 views1 answer
Onbackpressed close the app in android
Java
-1 vote193 views1 answer
What is treeset in java
Java
0 vote214 views1 answer
Java get object from string name
Java
1 vote201 views1 answer
Get world by name bukkit
Java
0 vote217 views1 answer
Find union and intersection of two arrays in java
Java
0 vote198 views1 answer
How good at you are at java
Java
1 vote212 views1 answer
Setting scale to big decimal java
Java
0 vote200 views1 answer
Strictfp java example
Java