delTradingDeal + unlock card
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		@@ -46,10 +46,18 @@ public class DBConnection {
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     * @return true bei erfolg, sonst false
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     */
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    public boolean updateCardLock(String name, boolean lock){
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        System.out.println("Update user_cards set gesperrt = " + lock + " where name = \'" + name + "\';");
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        return PostgresHelper.executeUpdate("Update user_cards set gesperrt = " + lock + " where name = \'" + name + "\';");
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    }
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    /**
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     * Löscht einen Trading Deal aus der Datenbank
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     * @param id Id des deals der gelöscht werden soll
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     * @return True bei erfolg, sonst false
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     */
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    public boolean deleteTradingDeal(String id){
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        return PostgresHelper.executeUpdate("delete from trading where id = \'" + id + "\';");
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    }
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    /**
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     * Fügt der DB einen Trading deal hinzu
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     * @param username User der den Trade hinzufügt
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@@ -405,7 +405,28 @@ public class Response {
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     * @throws JsonProcessingException Fehler beim de-/serialisieren
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     */
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    private void deleteMethodes(){
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        if (this.url.startsWith("/messages")) {
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        if (this.url.startsWith("/tradings")) {
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            String tradeid = this.url.substring(this.url.lastIndexOf('/') + 1);
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            System.out.println("Format in /tradings/{tradingid}: " + tradeid);
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            ArrayList<TradingDeal> allTradingDeals = new DBConnection().getAllTradingDeals();
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            TradingDeal tr = null;
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            if (allTradingDeals != null && !allTradingDeals.isEmpty()) {
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                for (TradingDeal i : allTradingDeals) {
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                    if (i.getId().equals(tradeid)) {
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                        tr = i;
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                    }
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                }
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                if (tr != null) {
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                    if (new DBConnection().deleteTradingDeal(tradeid)) {
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                        if (new DBConnection().updateCardLock(tr.getCardToTrade().getName(), false))
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                            sendResponse("", "204");
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                    } else {
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                        sendError("500");
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                    }
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                }else{
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                    sendError("500");
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                }
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            }
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        }
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    }
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