Delete specific rows from an Access table using Jackcess

Question

I am using the Jackcess API with an Access database. I open the database and get a specific table. How can I get the data (rows) from this table which matches a list of ids?

For example get all the rows from the table where id is in List.

 private List<Component> disabledComponentsIds;
 private Database db = null;

 db = Database.open(new File(target), false, false);

 Table table = db.getTable("t_object");
        Table packages = db.getTable("t_package");
        for(Map<String, Object> r : table){
            if(disabledComponentsIds.contains(r.get("ea_guid"))){
                r.get("package_id");
                //Delete row from t_package table where id  = r.get("package_id")
            }
        }

In this particular case I want to delete the rows.

Answer 1

Given a table named "t_object" ...

object_id  object_name
---------  -----------
        1  alpha      
        2  bravo      
        3  charlie    
        4  delta      
        5  echo       

... where "object_id" is the primary key, you could delete specific rows like so:

// test data
ArrayList<Integer> enabledComponentsIds = new ArrayList<>();
enabledComponentsIds.add(2);
enabledComponentsIds.add(3);

String dbFileSpec = "C:/Users/Public/jackcessTest.mdb";
try (Database db = DatabaseBuilder.open(new File(dbFileSpec))) {
    Table t = db.getTable("t_object");
    for (int id : enabledComponentsIds) {
        Row r = CursorBuilder.findRowByPrimaryKey(t, id);
        if (r != null) {
            t.deleteRow(r);
        }
    }
} catch (Exception e) {
    e.printStackTrace(System.err);
}

That will delete the rows where "object_id" is 2 or 3.

Edit:

If the column is not indexed then you'll have to iterate through each row (as Kayaman suggested) and see if its column value is contained in the list:

// test data
ArrayList<Integer> enabledComponentsIds = new ArrayList<>();
enabledComponentsIds.add(2);
enabledComponentsIds.add(3);

String dbFileSpec = "C:/Users/Public/jackcessTest.mdb";
try (Database db = DatabaseBuilder.open(new File(dbFileSpec))) {
    Table t = db.getTable("t_object");
    for (Row r : t) {
        if (enabledComponentsIds.contains(r.getInt("object_id"))) {
            t.deleteRow(r);
        }
    }
} catch (Exception e) {
    e.printStackTrace(System.err);
}