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Listing 3-7. The mysql_parse() Function void mysql_parse(THD *thd, char *inBuf, uint length) { ... if (query_cache_send_result_to_client(thd, inBuf, length) <= 0) { LEX *lex= thd->lex; ... if (!yyparse((void *)thd) && ! thd->is_fatal_error) { ... mysql_execute_command(thd); query_cache_end_of_result(thd); ... } ... } The first thing to notice is the call to the query cache. The query cache stores all of the most frequently requested queries complete with the results. If the query is already in the query cache, you re done! All that is left is to return the results to the client. No parsing, optimizing, or even executing is necessary. How cool is that For the sake of our exploration, let s assume the query cache does not contain a copy of the example query. In this case, the function creates a new LEX structure to contain the internal representation of the query. This structure is filled out by the Lex/YACC parser, shown in Listing 3-8. Listing 3-8. The SELECT Lex/YACC Parsing Code Excerpt select: select_init { LEX *lex= Lex; lex->sql_command= SQLCOM_SELECT; } ;

When a routine encounters a problem, it may respond in several ways, such as by recovering internally, emitting a warning, returning a marker value or incomplete result, or throwing an exception. The following code indicates how an exception can be thrown by some of the code we have already been using: > let req = System.Net.WebRequest.Create("not a URL");; System.UriFormatException: Invalid URI: The format of the URI could not be determined.

Tuples ( 3) (expr, ..., expr) fst expr snd expr Tuple First of pair Second of pair Arrays ( 4) [| expr; ...; expr |] [| expr..expr |] [| comp-expr |] Array.create size expr Array.init size expr arr.[expr] arr.[expr] <- expr arr.[expr..expr] arr.[expr..] arr.[..expr] Array literal Range array Generated array Array creation Array init Lookup Assignment Slice Right slice Left slice

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/* Need select_init2 for subselects. */ select_init: SELECT_SYM select_init2 | '(' select_paren ')' union_opt; select_paren: SELECT_SYM select_part2 { LEX *lex= Lex; SELECT_LEX * sel= lex->current_select; if (sel->set_braces(1)) { yyerror(ER(ER_SYNTAX_ERROR)); YYABORT; } if (sel->linkage == UNION_TYPE && !sel->master_unit()->first_select()->braces) { yyerror(ER(ER_SYNTAX_ERROR)); YYABORT; } /* select in braces, can't contain global parameters */ if (sel->master_unit()->fake_select_lex) sel->master_unit()->global_parameters= sel->master_unit()->fake_select_lex; } | '(' select_paren ')'; select_init2: select_part2 { LEX *lex= Lex; SELECT_LEX * sel= lex->current_select; if (lex->current_select->set_braces(0)) { yyerror(ER(ER_SYNTAX_ERROR)); YYABORT; } if (sel->linkage == UNION_TYPE && sel->master_unit()->first_select()->braces) { yyerror(ER(ER_SYNTAX_ERROR)); YYABORT; } }

Similarly, the GetResponse method also used in the http function may raise a System.Net. WebException exception. The exceptions that may be raised by routines are typically recorded in the documentation for those routines. Exception values may also be raised explicitly by F# code: > raise (System.InvalidOperationException("not today thank you"));; System.InvalidOperationException: not today thank you In F#, exceptions are commonly raised using the F# failwith function: > if false then 3 else failwith "hit the wall";; Microsoft.FSharp.Core.FailureException: hit the wall The types of some of the common functions used to raise exceptions are shown here: val val val val failwith : string -> 'a raise: #exn -> 'a failwithf : StringFormat<'a,'b> -> 'a invalid_arg : string -> 'a

F# Lists ( 3) [ expr; ...; expr ] [ expr..expr ] [ comp-expr ] expr :: expr expr @ expr List Range list Generated list List cons List append

union_clause ; select_part2: { LEX *lex= Lex; SELECT_LEX *sel= lex->current_select; if (sel->linkage != UNION_TYPE) mysql_init_select(lex); lex->current_select->parsing_place= SELECT_LIST; } select_options select_item_list { Select->parsing_place= NO_MATTER; } select_into select_lock_type; select_into: opt_order_clause opt_limit_clause {} | into | select_from | into select_from | select_from into; select_from: FROM join_table_list where_clause group_clause having_clause opt_order_clause opt_limit_clause procedure_clause | FROM DUAL_SYM where_clause opt_limit_clause /* oracle compatibility: oracle always requires FROM clause, and DUAL is system table without fields. Is "SELECT 1 FROM DUAL" any better than "SELECT 1" Hmmm :) */ ; select_options: /* empty*/ | select_option_list { if (Select->options & SELECT_DISTINCT && Select->options & SELECT_ALL) { my_error(ER_WRONG_USAGE, MYF(0), "ALL", "DISTINCT"); YYABORT; } } ;

Note that the return types of all these are generic type variables, meaning that the functions never return normally and instead return by raising an exception. This means they can be used to form an expression of any particular type and indeed can be handy when you re drafting your code. For example, in the following program we ve left part of the program incomplete: if (System.DateTime.Now > failwith "not yet decided") then printfn "you ve run out of time!" Table 4-2 shows some of the common exceptions that are raised by failwith and other operations.

Some Other Collection Types System.Collections.Generic.Dictionary System.Collections.Generic.List System.Collections.Generic.SortedList System.Collections.Generic.SortedDictionary System.Collections.Generic.Stack System.Collections.Generic.Queue Microsoft.FSharp.Collections.Set Microsoft.FSharp.Collections.Map

select_option_list: select_option_list select_option | select_option; select_option: STRAIGHT_JOIN { Select->options|= SELECT_STRAIGHT_JOIN; } | HIGH_PRIORITY { if (check_simple_select()) YYABORT; Lex->lock_option= TL_READ_HIGH_PRIORITY; } | DISTINCT { Select->options|= SELECT_DISTINCT; } | SQL_SMALL_RESULT { Select->options|= SELECT_SMALL_RESULT; } | SQL_BIG_RESULT { Select->options|= SELECT_BIG_RESULT; } | SQL_BUFFER_RESULT { if (check_simple_select()) YYABORT; Select->options|= OPTION_BUFFER_RESULT; } | SQL_CALC_FOUND_ROWS { if (check_simple_select()) YYABORT; Select->options|= OPTION_FOUND_ROWS; } | SQL_NO_CACHE_SYM { Lex->safe_to_cache_query=0; } | SQL_CACHE_SYM { Lex->select_lex.options|= OPTION_TO_QUERY_CACHE; } | ALL { Select->options|= SELECT_ALL; } ; select_lock_type: /* empty */ | FOR_SYM UPDATE_SYM { LEX *lex=Lex; lex->current_select->set_lock_for_tables(TL_WRITE); lex->safe_to_cache_query=0; }

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