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for (client_iter = client_list.begin(); client_iter != client_list.end(); ++client_iter) { /* Tell other clients that a new user has joined */ if ((*client_iter).first != cmd.op1) { (*client_iter).second.outbound.push_back("JOIN " + cmd.op1); } /* Tell the new client which users are already in the room */ client_list[cmd.op1].outbound.push_back("JOIN " + (*client_iter).first); /* Tell the new client who has operator status */ if ((*client_iter).second.opstatus == true) { client_list[cmd.op1].outbound.push_back("OP " + (*client_iter).first); } } asp.net code 128 reader C# Code 128 Reader SDK to read, scan Code 128 in C#.NET class ...
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NET Application. Use KA.Barcode Reader for .NET to Scan and Read Linear & 2D Barcode Images in .NET. Completely integrated into Visual Studio .NET, ASP. Okay, so you created and then enforced a relationship between the category and department tables. But how does it work, and how does it affect your life Let s study how you implemented this relationship. In the category table, apart from the primary key and the usual category_id, name, column, and description columns, you added a department_id column. This column stores the ID of the department the category belongs to. Because the department_id field in category doesn t allow NULLs, you must supply a department for each category. Furthermore, because of the foreign key relationship, the database won t allow you to specify a nonexistent department. The foreign key s behavior is dictated by the command used to create it, which in our case is CONSTRAINT fk_department_id FOREIGN KEY (department_id) REFERENCES department (department_id) ON UPDATE RESTRICT ON DELETE RESTRICT The constraint can be instructed to act differently on update and delete operations. Here, in both cases the behavior is RESTRICT. Let s see the alternatives: Microsoft designed the .NET Framework with certain goals in mind. The following sections examine these goals and how the .NET Framework achieves them. int msg_command(const cmd_t &cmd, const string &nickname, string &msg) { map<string, client_t>::iterator client_iter; pthread_mutex_lock(&client_list_mutex); for (client_iter = client_list.begin(); client_iter != client_list.end(); client_iter++) { (*client_iter).second.outbound.push_back("MSG " + nickname + " " + cmd.op1 + " " + cmd.op2); } pthread_mutex_unlock(&client_list_mutex); msg = "100 OK"; return 1; } RESTRICT (similar to NO ACTION): This is probably the most important of the options It tells PostgreSQL to make sure that database operations on the tables involved in the relationship don t break the relationship When this option is set, PostgreSQL won t allow you to add categories to nonexistent departments or delete departments that have related categories CASCADE: Performs automatic data changes to maintain the data integrity For example, changing the ID of an existing department would cause the change to propagate to the category table to keep the categorydepartment associations intact This way, even after you change the ID of the department, its categories would still belong to it This option is dangerous because when deleting a department, PostgreSQL automatically deletes all the department s related categories This is a sensitive option, so be very careful with it You won t use it in the HatShop project. Handling a private message is almost as easy. First, we check to make sure that the recipient exists and, if so, add the message to their outbound queue. asp.net code 128 reader .NET Barcode Reader Software | Code 128 Scanning DLL Library ...
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