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All this might make it sound as if your e-commerce business can t possibly fail. Well, it s time to take a cold shower and realize that even the best-laid plans often go wrong. Some risks are particularly relevant to e-commerce companies, such as Hacking Credit card scams Hardware failures Unreliable shipping services Software errors Changing laws You can t get rid of these risks, but you can try to understand them and defend yourself from them. The software developed in this book goes some way to meeting these issues, but many of the risks have little to do with the site itself. An important way to defend your site from many risks is to maintain backups. You already know backups are important. But if you re anything like me, when it gets to the end of the day, saving five minutes and going home earlier seems even more important. When you have a live web site, this simply isn t an option. We haven t talked much about the legal side of e-commerce in this book because we are programmers, not lawyers. However if you are setting up an e-commerce site that goes much beyond an online garage sale, you ll need to look into these issues before putting your business online.

9

4. Execute the query by selecting Query Execute, or by pressing F5. The results can be seen in Figure 4-6.

(*client_iter).second.outbound.push_back("KICK " + cmd.op1 + " " + nickname); } msg = "100 OK"; } } } pthread_mutex_unlock(&client_list_mutex); return 1; }

Figure 4-6. Adding sample categories 5. Now, try to break the database integrity by adding a category to a nonexistent department (for example, set the DepartmentID to 500). Try executing this SQL command using pgAdmin III: INSERT INTO category (department_id, name, description) VALUES (500, 'New category', 'Executing this command should throw an error.'); 6. If everything goes well, the database should deny adding the new record, throwing this error you can see in Figure 4-7.

Room operators have the ability to set the topic for the room. This function handles the TOPIC command. It is very similar to the other operator-only commands.

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After completing this activity, you should be familiar with the following: Determining the classes that need to be constructed by examining the use case and the system scope documentation Using a UML modeling tool to create a class diagram

int topic_command(const cmd_t &cmd, const string &nickname, string &msg) { map<string, client_t>::iterator client_iter; pthread_mutex_lock(&client_list_mutex); client_iter = client_list.find(nickname); if (client_iter == client_list.end()) { msg = "999 UNKNOWN"; } else { if ((*client_iter).second.opstatus == false) { msg = "203 DENIED"; } else { pthread_mutex_lock(&room_topic_mutex); room_topic = cmd.op1; if (cmd.op2.length() != 0) { room_topic += " " + cmd.op2; } for (client_iter = client_list.begin(); client_iter != client_list.end(); client_iter++) { (*client_iter).second.outbound.push_back("TOPIC " + nickname + " " + room_topic); } pthread_mutex_unlock(&room_topic_mutex); msg = "100 OK"; } }

Adding data to your table should be a trivial task, given that you know the data that needs to be inserted. As pointed out earlier, you can find the SQL scripts in the book s code in the Source Code/Download section of the Apress web site (http://www.apress.com). Note how we escaped the special characters in the category descriptions, such as the single quotes, which need to be doubled, so PostgreSQL will know to interpret that as a quote to be added to the description, instead of a string termination character. When manually adding values to fields whose values would otherwise be generated by sequences, you need to manually update the sequence because the sequences are separate database objects that aren t automatically updated if they aren t used to generate data. If you don t change the sequence, it would probably end up generating values that have already been added to the database, and some or all of your INSERT commands would end up throwing errors.

pthread_mutex_unlock(&client_list_mutex); return 1; }

You ll now go through the same steps as earlier, but this time, you ll create a bit more complicated table: product. The product table has the fields shown in Table 4-3. Table 4-3. Designing the product Table

Finally, we need to handle the QUIT command. We remove the client from the client_list map and notify the others in the room that the client has left.

SERIAL VARCHAR(50) VARCHAR(1000) NUMERIC(10,2) NUMERIC(10,2) VARCHAR(150)

int quit_command(const string &nickname, string &msg) { map<string, client_t>::iterator client_iter; pthread_mutex_lock(&client_list_mutex); client_iter = client_list.find(nickname); if (client_iter == client_list.end()) { msg = "999 UNKNOWN"; } else { client_list.erase(client_iter); for (client_iter = client_list.begin(); client_iter != client_list.end(); client_iter++) { (*client_iter).second.outbound.push_back("QUIT " + nickname); } msg = "100 OK"; } pthread_mutex_unlock(&client_list_mutex); return 1; }

The server can be compiled as follows:

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