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The first step in using LINQ with F# is to generate the code that implements the object/relational (O/R) mapping for the database tables to which you are connecting Let s first look at why you want to do this You learned previously how you can create simple tables and store and retrieve data using SQL code However, this approach doesn t work well for large data schemas with multiple related tables and constraints For instance, creating a hierarchy of records in a number of related tables connected by foreign keys involves issuing multiple SQL statements to create the base data and to connect them in ways that obey the foreign key and other constraints that may be in place Instead, it can often be much better to view records in tables as if they were objects This is part of what an O/R mapping provides.

The EXPLAIN SELECT DBXP command shows the query path as a tree printed out within the confines of character text. The EXPLAIN code is executed in a function named show_plan in the sql_DBXP_parse.cc file. A helper function named write_printf is used to make the show_plan code easier to read. Listings 10-24 and 10-25 show the completed code for both of these methods. Listing 10-24. Adding a Function to Capture the Protocol Store and Write Statements /* Write to vio with printf. SYNOPSIS write_printf() Protocol *p char *first char *last

Developing Ajax applications with the first two techniques follows a fairly standard path mostly independent of F#. The remainder of this section gives a brief overview of some of the core WebSharper features, including pagelets, formlets, and flowlets.

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You already saw that datasets can be used to fetch and manipulate data in a disconnected way These datasets are managed by data adapters that handle the gory details of producing and issuing the appropriate SQL statements to the underlying database when fetching records or synchronizing the changes made to the dataset back to the database The main goal of a separate Data Access Layer (DAL) is to bridge the gap between two disparate domains: the database and your application logic Practically speaking, this means freeing you from having to write SQL code and mingling it with your application code O/R mappings use smart data objects that can load and persist record-level data, and underneath they use objects such as ADONET datasets that are filled and flushed on demand The tool we focus on in this section is SqlMetal, which computes the O/R mapping for LINQ, part of the .

RETURN VALUE Success = 0 Failed = 1 */ int write_printf(Protocol *p, char *first, char *last) { char *str = (char *)my_malloc(256, MYF(MY_ZEROFILL | MY_WME)); DBUG_ENTER("write_printf"); strcpy(str, first); strcat(str, last); p->prepare_for_resend(); p->store(str, system_charset_info); p->write(); my_free((gptr)str, MYF(0)); DBUG_RETURN(0); } Notice that the write_printf code calls the protocol->store and protocol->write functions to write a line of the drawing to the client. I ll let you explore the show_plan source code shown in Listing 10-25 to see how it works. I ll show you an example of the code executing in the next section. The code uses a postorder traversal to generate the query plan from the query tree starting at the root. Add these methods to the sql_DBXP_parse.cc file. Listing 10-25. The show_plan Source Code /* Show Query Plan SYNOPSIS show_plan() Protocol *p query_node *Root query_node *qn bool print_on_right

WebSharper enables robust, rapid, client-based web application development with F# and provides a wealth of composable primitives to build web applications from small to large-scale. These represent an extremely powerful way of writing robust, efficient, integrated client/server applications in a single, type-checked framework. In particular, WebSharper employs several advanced features of F#, the combination of which offers a unique programming experience for web applications: Client-side and server-side code are marked with custom attributes and can be authored in a single F# project. Client-side code, called pagelets, is automatically translated to JavaScript using F# quotations and reflection and is served to the client on demand. (See 9 for details on F# quotations and reflection.) The program runs initially as a server-side application, generating JavaScript code to populate and handle the interactions of the web user interface. Web forms can be expressed in an extraordinarily compact form as first-class, type-safe values and are represented as formlets. They can be composed and enhanced with just a few lines of code, including adding validation and complex user interactions, and defining dependent formlets. Sequences of web forms, flowlets, are first-class values, providing an elegant and concise way to express larger-than-page functionality, yet remaining in Ajax space.

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