Implement delete command

src/main/java/wtf/beatrice/nounspicker/commands/subcommands/NounsAddSubCommand.java

@@ -32,10 +32,11 @@ public class NounsAddSubCommand
 
             int id = Cache.dbManager.getPronounId(pronoun);
             sender.sendMessage("New pronoun " + pronoun + " added with id " + id + "! Format is " + format);
+            return true;
         } else {
             sender.sendMessage("Error creating new pronoun! Check console for details.");
+            return true;
         }
 
-        return true;
     }
 }

src/main/java/wtf/beatrice/nounspicker/commands/subcommands/NounsDeleteSubCommand.java

@@ -0,0 +1,36 @@
+package wtf.beatrice.nounspicker.commands.subcommands;
+
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+import wtf.beatrice.nounspicker.utils.Cache;
+
+public class NounsDeleteSubCommand
+{
+
+    public static boolean run(@NotNull CommandSender sender,
+                              @NotNull String[] args)
+    {
+        if(args.length < 2) {
+            sender.sendMessage("usage: /nouns delete <pronoun>");
+            return true;
+        }
+
+        String pronoun = args[1].toLowerCase();
+
+        if(!Cache.dbManager.isPronounValid(pronoun))
+        {
+            sender.sendMessage("The pronoun " + pronoun + " doesn't exist!");
+            return true;
+        }
+
+        if(Cache.dbManager.deletePronoun(pronoun))
+        {
+            sender.sendMessage("Pronoun deleted successfully and removed from all users!");
+            return true;
+        } else {
+            sender.sendMessage("Could not delete pronoun " + pronoun + "! Check console for details.");
+            return true;
+        }
+
+    }
+}

src/main/java/wtf/beatrice/nounspicker/utils/DatabaseManager.java

@@ -61,8 +61,8 @@ public class DatabaseManager
 
         newTables.add("CREATE TABLE IF NOT EXISTS players (" +
                 "player text NOT NULL," +
-                "main_pronoun_id integer," +
+                "main_pronoun_id INTEGER DEFAULT -1," +
-                "secondary_pronoun_id integer" +
+                "secondary_pronoun_id INTEGER DEFAULT -1" +
                 ");");
 
         newTables.add("CREATE TABLE IF NOT EXISTS pronouns (" +
@@ -169,6 +169,47 @@ public class DatabaseManager
         return -1;
     }
 
+    public boolean deletePronoun(String pronoun) {
+
+        // get the pronoun id (so we can remove it from users)
+        int pronounId = getPronounId(pronoun);
+
+        // delete it from the list of pronouns
+        String query = "DELETE FROM pronouns " +
+                "WHERE pronoun = ?;";
+
+        try (PreparedStatement preparedStatement = dbConnection.prepareStatement(query)) {
+            preparedStatement.setString(1, pronoun);
+            preparedStatement.execute();
+        } catch (SQLException e) {
+            logger.err(e.getMessage());
+            return false;
+        }
+
+        // set players who had this pronoun to -1, which means no pronoun
+        List<String> queries = new ArrayList<>();
+
+        queries.add("UPDATE players " +
+                "SET main_pronoun_id = -1 " +
+                "WHERE main_pronoun_id = " + pronounId + ";");
+
+        queries.add("UPDATE players " +
+                "SET secondary_pronoun_id = -1 " +
+                "WHERE secondary_pronoun_id = " + pronounId + ";");
+
+        for(String q : queries) {
+            try(Statement stmt = dbConnection.createStatement()) {
+                stmt.execute(q);
+            } catch (SQLException e) {
+                logger.err(e.getMessage());
+                return false;
+            }
+        }
+
+        // accounce success
+        return true;
+    }
+
 
 
 }