public int getHighestId() {
Connection connection = JDBCManager.getConnection();
Statement statement = null;
int highestId = 0;
try {
statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(highestIdSQL);
while (resultSet.next()) {
highestId = resultSet.getInt("MaxChatId");
}
resultSet.close();
} catch (Exception exception) {
exception.printStackTrace();
} finally {
try {
statement.close();
} catch (Exception exception) {
exception.printStackTrace();
}
JDBCManager.closeConnection(connection);
}
return highestId;
}
public Chat getChat(int chatIdno) {
Connection connection = JDBCManager.getConnection();
Statement statement = null;
Chat chat = null;
try {
statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(selectSQL + chatIdno);
while (resultSet.next()) {
chat = new Chat();
int chatId = resultSet.getInt("chatId");
String chatText = resultSet.getString("chatText");
int fromUser = resultSet.getInt("fromUser");
chat.setChatId(chatId);
chat.setChatText(chatText);
chat.setFromUserId(fromUser);
}
} catch (Exception exception) {
exception.printStackTrace();
} finally {
try {
statement.close();
} catch (Exception exception) {
exception.printStackTrace();
}
JDBCManager.closeConnection(connection);
}
return chat;
}
public List<Chat> getChatTo(int toUser, int fromUser) {
Connection connection = JDBCManager.getConnection();
PreparedStatement preparedStatement = null;
List<UserChat> userChatList = new ArrayList<UserChat>();
try {
preparedStatement = connection.prepareStatement(toSelectSQL);
preparedStatement.setInt(1, toUser);
preparedStatement.setInt(2, fromUser);
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
int chatUserId = resultSet.getInt("ChatUserId");
int toUserId = resultSet.getInt("toUserId");
int fromUserId = resultSet.getInt("fromUserId");
int chatId = resultSet.getInt("chatId");
UserChat chatUser = new UserChat();
chatUser.setChatId(chatId);
chatUser.setChatUserId(chatUserId);
chatUser.setFromUserId(fromUserId);
chatUser.setToUserId(toUserId);
userChatList.add(chatUser);
}
resultSet.close();
} catch (Exception exception) {
exception.printStackTrace();
} finally {
try {
preparedStatement.close();
} catch (Exception exception) {
exception.printStackTrace();
}
JDBCManager.closeConnection(connection);
}
List<Chat> chatList = new ArrayList<Chat>();
for (UserChat userChat : userChatList) {
Chat chat = getChat(userChat.getChatId());
chatList.add(chat);
}
return chatList;
}
public void deleteChat(Chat chat) {
Connection connection = JDBCManager.getConnection();
PreparedStatement preparedStatement = null;
try {
preparedStatement = connection.prepareStatement(deleteSQL);
preparedStatement.setInt(1, chat.getChatId());
preparedStatement.executeUpdate();
} catch (Exception exception) {
exception.printStackTrace();
} finally {
try {
preparedStatement.close();
} catch (Exception exception) {
exception.printStackTrace();
}
JDBCManager.closeConnection(connection);
}
}
public void saveChat(Chat chat) {
Connection connection = JDBCManager.getConnection();
PreparedStatement preparedStatement = null;
try {
preparedStatement = connection.prepareStatement(insertSQL);
preparedStatement.setInt(1, chat.getChatId());
preparedStatement.setString(2, chat.getChatText());
preparedStatement.setInt(3, chat.getFromUserId());
preparedStatement.execute();
} catch (Exception exception) {
exception.printStackTrace();
} finally {
try {
preparedStatement.close();
} catch (Exception exception) {
exception.printStackTrace();
}
JDBCManager.closeConnection(connection);
}
}
public List<Chat> getChatFrom(int fromUser) {
Connection connection = JDBCManager.getConnection();
Statement statement = null;
List<Chat> chatList = new ArrayList<Chat>();
try {
statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(fromSelectSQL + fromUser);
while (resultSet.next()) {
int chatId = resultSet.getInt("ChatId");
String chatText = resultSet.getString("ChatText");
int fromUserId = resultSet.getInt("fromUser");
Chat chat = new Chat();
chat.setChatId(chatId);
chat.setChatText(chatText);
chat.setFromUserId(fromUserId);
chatList.add(chat);
}
resultSet.close();
} catch (Exception exception) {
exception.printStackTrace();
} finally {
try {
statement.close();
} catch (Exception exception) {
exception.printStackTrace();
}
JDBCManager.closeConnection(connection);
}
return chatList;
}
