/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 vote286 views1 answer
Java jackson cast to list
Java
0 vote297 views1 answer
Create embeds jda discord
Java
0 vote289 views1 answer
Difference between maven and cucumber test runner
Java
0 vote278 views1 answer
Vue input pre initial value
Java
2 votes269 views1 answer
Check array is sorted java
Java
6 votes300 views2 answers
Get absolute path from relative java
Java
3 votes268 views1 answer
Konnichiwa in japanese
Java
0 vote283 views1 answer
Java program pattern program to triangle using 100 numbers
Java
3 votes307 views1 answer
Know the version of maven
Java
0 vote276 views1 answer
Java filter array by even numbers
Java