Get Developer's Guide to Multiplayer Games (Wordware Game PDF

By Andrew Mulholland

This can be one of many few books out there that offers the programmer and developer with the main points of constructing desktop video games on the net with distinctive specialise in MYSQL and Perl.

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Figure 2-32 The Order By command is also particularly useful when used with timestamp fields; it allows you to easily see, for example, the people who login to the game the most or least. Another example of its use would be to find out which ten people have the most experience. 38 Chapter 2 / Internet-Based Database Systems Retrieving the Last Data Entered This is where our id field becomes useful. To retrieve the last data entered, we will first select the maximum id value from the table and store it in a temporary variable within MySQL.

In MySQL we use the Delete From command, and specify parameters to avoid deleting all the data from the table. We can use the following syntax to delete Jeff from our table: mysql> DELETE FROM playerinfo WHERE name = “Jeff Henderson”; Chapter 2 / Internet-Based Database Systems 41 When we execute this command, MySQL informs us that one row (record) was affected by the command. In this case, the record has been deleted. This can be seen in Figure 2-37. Figure 2-37 If we now select all the data from the table, you will notice the absence of Jeff’s record in the following figure.

Use this command carefully as it is not possible to restore your data once it is deleted. Note that when you delete all the information from a table, the table itself still exists; therefore, it is possible to add new information to it. To delete all the information from a table, you again use the Delete From command, but this time we do not specify any parameters. As you can see, it could be easy to unintentionally execute this command, which is why we must be careful with our use of it. The command to delete all the information from the playerinfo table is as follows: mysql> DELETE FROM playerinfo; Notice the command is the same as before, but without the parameters.

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