remove getCategories method from IDatabase

src/main/java/fr/unistra/sil/erp/back/db/DatabaseSQLiteImpl.java

@@ -4,7 +4,6 @@
  */
 package fr.unistra.sil.erp.back.db;
 
-import fr.unistra.sil.erp.back.model.Category;
 import fr.unistra.sil.erp.back.model.Item;
 import fr.unistra.sil.erp.back.model.RegistryEntry;
 import fr.unistra.sil.erp.back.model.Stock;
@@ -14,7 +13,6 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
-import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
@@ -48,13 +46,7 @@ public class DatabaseSQLiteImpl implements IDatabase {
      */
     private static final String SQL_GETITEMSFROMCATEGORY = SQL_GETALLITEMS +
             " WHERE category = ?";
-    
-    /**
-     * Query used to retrieve all categories stored in the database.
-     */
-    private static final String SQL_GETCATEGORIES =
-            "SELECT id, name FROM categories";
-    
+
     /**
      * Query used to fetch all stocks stored in the database.
      */
@@ -200,32 +192,6 @@ public class DatabaseSQLiteImpl implements IDatabase {
         return res;
     }
 
-    /**
-     * Retrieves all categories from the database.
-     * @return the list of categories.
-     */
-    @Override
-    public List<Category> getCategories() {
-        ResultSet rs = this.query(SQL_GETCATEGORIES);
-        if(rs == null)
-            return null;
-        
-        List<Category> res = new ArrayList<>();
-        try {
-            while(rs.next())
-            {
-                Category c = new Category(rs.getInt("id"), rs.getString("name"));
-                res.add(c);
-            }
-        } catch (SQLException ex) {
-            Logger.getLogger(DatabaseSQLiteImpl.class.getName()).log(
-                    Level.SEVERE, "Failed to fetch results.", ex);
-            return null;
-        }
-        
-        return res;
-    }
-
     /**
      * Retrieves all stock entries from the database.
      * @return the list of stock entries.

src/main/java/fr/unistra/sil/erp/back/db/IDatabase.java

@@ -32,14 +32,7 @@ public interface IDatabase {
      * @return the list of items, or null if an error occurred.
      */
     public List<Item> getItemsFromCategory(int category);
-    
-    /**
-     * Returns the list of all categories.
-     * 
-     * @return the list of categories, or null if an error occurred.
-     */
-    public List<Category> getCategories();
-    
+
     /**
      * Returns the list of all stocks.
      *