update v0.1.2, update self roles code

src/commands/self_roles/mod.rs

@@ -26,9 +26,45 @@ pub async fn role(_ctx: Context<'_>) -> Result<(), Error> {
     Ok(())
 }
 
+/// Remove a row concerning a user's self role from the database
+pub async fn remove_user_role<'a, E>(user: UserId, guild: GuildId, db: E) -> Result<(), Error>
+    where E: PgExecutor<'a>,
+{
+    sqlx::query("DELETE FROM selfroles WHERE userid = $1 AND guildid = $2")
+        .bind(user.get() as i64)
+        .bind(guild.get() as i64)
+        .execute(db).await?;
+
+    Ok(())
+}
+
+pub async fn remove_role<'a, E>(role: RoleId, guild: GuildId, db: E) -> Result<(), Error>
+where E: PgExecutor<'a>
+{
+    sqlx::query("DELETE FROM selfroles WHERE roleid = $1 AND guildid = $2")
+        .bind(role.get() as i64)
+        .bind(guild.get() as i64)
+        .execute(db).await?;
+
+    Ok(())
+}
+
+/// Replace a user's custom role with a new one
+pub async fn update_user_role<'a, E>(user: UserId, guild: GuildId, role: RoleId, db: E) -> Result<(), Error>
+    where E: PgExecutor<'a>,
+{
+    sqlx::query("INSERT INTO selfroles (userid, guildid, roleid) VALUES($1, $2, $3) ON CONFLICT (userid, guildid) DO UPDATE SET roleid = EXCLUDED.roleid")
+        .bind(user.get() as i64)
+        .bind(guild.get() as i64)
+        .bind(role.get() as i64)
+        .execute(db).await?;
+
+    Ok(())
+}
+
+/// Get a user's personal role id from the database
 pub async fn get_user_role<'a, E>(user: UserId, guild: GuildId, db: E) -> Result<Option<RoleId>, Error>
-where
-    E: PgExecutor<'a>,
+    where E: PgExecutor<'a>,
 {
     match sqlx::query("SELECT roleid FROM selfroles WHERE userid = $1 AND guildid = $2")
         .bind(user.get() as i64)