Simple .NET/ASP.NET PDF document editor web control SDK

Web development frameworks such as ASP.NET can be a little bewildering at first. One reason for this is the number of languages involved in even simple websites. For example, developing a minimal website using ASP.NET involves using at least five different languages to represent the necessary information: ASP.NET page markup (ASPX), used for the declarative construction and configuration of server controls that form the page HTML, used for the basic presentation content embedded in the ASP.NET markup Cascading Style Sheets (CSS), used for declarative control over visual characteristics of the presentation content XML, used for the configuration files of the website F# and/or another .NET language, used for expressing the website logic In contrast, the programs you ve seen so far in this book have used only one language (F#) with only one kind of file (source code files with the suffix .fs). Furthermore, a fully fledged website can involve further additional languages and schemas: SQL, for the queries and commands used for database access and management JavaScript, for dynamic client-side behavior, a topic we discuss later in this chapter Further XML schemas, for files specifying additional website data or security and configuration information Database connection strings, for configuring access to underlying databases

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/* constructor */ public Address() { } public Address(String line1, String line2, String street, String city, String state, String zip) throws SQLException { setLine1(line1); setLine2(line2); setStreet(street); setCity(city); setState(state); setZip(zip); }

The ellipses all indicate omission of a full assembly name or a namespace. The important bits are retained. You can see from this configuration that a database named PubsDatabase is now mapped to a connection string to that database. You can create an instance of a database object that represents this connection with a single line of code. Database db = DatabaseFactory.CreateDatabase("PubsDatabase"); Also, because the PubsDatabase is set as the default instance, you can simply create it with: Database db = DatabaseFactory.CreateDatabase(); Naming the instance is only necessary when you re using more than one database from an application. You can still use a default in that case, but you ll be better off naming all instances explicitly to clarify the code and ease maintenance. Now that you have an instance to a Database object, the rest of the work is done with its instance methods. All of the code that follows requires a reference to the assembly named Microsoft.Practices.EnterpriseLibrary.Data.dll and the following using statement. using Microsoft.Practices.EnterpriseLibrary.Data;

This has the effect of making simple website projects seem quite complex. To help you through this, Table 14-1 shows the most common file types used when writing web applications using F# and ASP.NET. Table 14-2 shows some additional file types that are useful to be aware of.

public void readSQL(SQLInput stream, String type) throws SQLException { setLine1(stream.readString()); setLine2(stream.readString()); setStreet(stream.readString()); setCity(stream.readString()); setState(stream.readString()); setZip(stream.readString()); } public void writeSQL(SQLOutput stream) throws SQLException { stream.writeString(getLine1()); stream.writeString(getLine2()); stream.writeString(getStreet()); stream.writeString(getCity()); stream.writeString(getState()); stream.writeString(getZip()); } public String getSQLTypeName() throws SQLException { return _SQL_NAME; } /* accessor methods */ public String getLine1() { return m_line1; } public void setLine1(String line1) { m_line1 = line1; } /* Other similar getter/setter methods for the remaining attributes deleted to conserve space */ } Note the following points about the generated Address class: The Address class implements java.sql.SQLData as required by the option usertypes=jdbc. The Address class does not implement the wrapper around the method get_address() in the object type address, as we specified method=none.

Web form (web page)

As discussed earlier, for the MyAddress class we didn t generate a method corresponding to the method get_address() in the object type address. Let s now extend the functionality to add this method. Later, we ll also look at automatically generating a wrapper method. The following sections discuss the two ways you can add this functionality in the extended class MyAddress.

There are several scenarios this block specifically sets out to simplify (see Table 11-6). These data access methods require many lines of code when you re using a Managed Provider directly, but only a few when you re using the helper methods exposed by the block. Table 11-6. Different Data Access Scenarios the Data Access Application Block Assists With