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Represents a character encoding The encoding for the UTF-8 Unicode format The encoding for the ASCII 7-bit character set The encoding for the UTF-16 Unicode format The encoding for the UTF-32 Unicode format Fetches an encoding by name Encodes a string to bytes Decodes a sequence of bytes Decodes a sequence of bytes

The general lesson here is to try to keep your core application pure and use both delayed computations (laziness) and imperative programming (side effects) where appropriate but to be careful about using them together.

char last_error[MYSQL_ERRMSG_SIZE], sqlstate[SQLSTATE_LENGTH+1]; unsigned int last_errno; unsigned char error; gptr query_cache_query; my_bool report_error; /* We should report error (we have unreported error) */ my_bool return_errno; } NET;

Another common requirement is to convert binary data to and from the standard 64-character stringencoded representation of binary data used in XML, e-mail, and other formats. You can do this using System.Convert.FromBase64String and System.Convert.ToBase64String.

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In the preceding tour of the source code, you saw many references to the THD class. In fact, there is exactly one THD object for every connection. The thread class is paramount to successful thread execution and is involved in every operation from implementing access control to returning results to the client. As a result, the THD class shows up in just about every subsystem or function that operates within the server. Listing 3-18 shows a condensed view of the THD class. Take a moment and browse through some of the member variables and methods. As you can see, this is a large class (I ve omitted a great many of the methods). The class is defined in the /sql/ sql_class.h source file and implemented in the /sql/sql_class.cc source file. Listing 3-18. The THD Class class THD :public Statement, public Open_tables_state { public: ... String packet; // dynamic buffer for network I/O String convert_buffer; // buffer for charset conversions struct sockaddr_in remote; // client socket address struct rand_struct rand; // used for authentication struct system_variables variables; // Changeable local variables struct system_status_var status_var; // Per thread statistic vars THR_LOCK_INFO lock_info; // Locking info of this thread THR_LOCK_OWNER main_lock_id; // To use for conventional queries THR_LOCK_OWNER *lock_id; // If not main_lock_id, points to // the lock_id of a cursor. pthread_mutex_t LOCK_delete; // Locked before thd is deleted ... char *db, *catalog; Security_context main_security_ctx; Security_context *security_ctx; ...

As you saw in 2, F# comes with a useful implementation of some functional programming data structures. Recall that functional data structures are persistent: you can t mutate them, and if you add an element or otherwise modify the collection, you generate a new collection value, perhaps sharing some internal nodes but from the outside appearing to be a new value. Table 10-9 summarizes the most important persistent functional data structures that are included in FSharp.Core.dll. It s likely that additional functional data structures will be added in future F# releases. Table 10-9. The F# Functional Data Structures from Microsoft.FSharp.Collections

In this chapter, you learned how you do imperative programming in F#, from some of the basic mutable data structures such as reference cells to working with side effects such as exceptions and I/O. You also looked at some general principles for avoiding the need for imperative programming and isolating your uses of side effects. In the next chapter, we return to some of the building blocks of both functional and imperative programming in F#, with a deeper look at types, type inference, and generics.

enum enum_server_command command; uint32 server_id; uint32 file_id; // for LOAD DATA INFILE ... const char *where; time_t start_time,time_after_lock,user_time; time_t connect_time,thr_create_time; // track down slow pthread_create thr_lock_type update_lock_default; delayed_insert *di; ... table_map ... ulong ... inline time_t query_start() { query_start_used=1; return start_time; } inline void set_time() { if (user_time) start_time=time_after_lock=user_time; else time_after_lock=time(&start_time); } inline void end_time() { time(&start_time); } inline void set_time(time_t t) { time_after_lock=start_time=user_time=t; } ... }; Now that you have had a tour of the source code and have examined some of the important classes and structures used in the system, I will shift the focus to items that will help you implement your own modifications to the MySQL system. Let s take a break from the source code and consider the coding guidelines and documentation aspects of software development. thread_id, col_access; used_tables;

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