/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

1 vote313 views1 answer
Spring serve robots.txt
Java
0 vote293 views1 answer
Path in spring form
Java
0 vote289 views1 answer
Zweidimensionales array erstellen java
Java
1 vote287 views1 answer
Hashmap to String array
Java
179 votes492 views10 answers
Minecraft
Java
-1 vote294 views2 answers
Running Sum of 1d Array
Java
0 vote298 views1 answer
Java pass parameters to mapper
Java
1 vote303 views1 answer
Java order agnostic binary search
Java
0 vote311 views1 answer
How to change numbers to English in printf
Java
0 vote293 views1 answer
Java trim unicode \u200b
Java