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As you can see, an SQL client module can be a handy tool for developing the SQL component of an application without having to embed the SQL statements within the host language. Unfortunately, SQL client modules are not widely supported in SQL implementations, and if they are supported, they are often not well documented. However, whether or not they re widely implemented is becoming beside the point as the industry moves away from embedded SQL and SQL client modules toward CLI and CLI-like data access, which I cover in the next section.

As you have seen so far in this chapter, a program can access an SQL database by using embedded SQL and SQL client modules In embedded SQL, SQL statements are inserted directly into the host programming language For SQL client modules, the host program calls modules that contain executable SQL statements The statements are separate from the host language SQL provides yet another method for accessing SQL data from within a programming language the call-level interface, or CLI A CLI is an application programming interface (API) that supports a set of predefined routines that allow a programming language to communicate with an SQL database The programming language calls the routines, which then connect to the database The routines access data and status information from the database, as required, and return that information to the program.

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Figure 17-3 provides an overview of how a CLI allows a program to communicate with an SQL database The program invokes CLI routines through the use of functions When calling a function, the program must specify values for the function s arguments These values define what actions to take and what data to access The function passes the values to the designated routine, which acts as an interface between the program and the SQL database The CLI, in effect, hides the details of accessing the database from the program, making it possible for the program to access databases in different management systems One of the most well-known implementations of the CLI model is Microsoft s Open Database Connectivity (ODBC) API, although other vendors have released CLI-like products that support similar types of database access.

Command1.Caption = "Calculate" Command1.FontSize = 10 Command2.Caption = "Exit" Command2.FontSize = 10 End Sub Private Sub mnuNew_Click() Dim NewFile As String, Day As String Dim HiTemp As Single CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowSave NewFile = CommonDialog1.FileName Open NewFile For Output As #1 Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Do While UCase(Day) <> "END" HiTemp = Val(InputBox("Please enter the high temperature:", "High Temp")) Write #1, Day, HiTemp Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Loop Close #1 CancelButton: Exit Sub End Sub Private Sub mnuAppend_Click() Dim OldFile As String, Day As String Dim HiTemp As Single CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowOpen OldFile = CommonDialog1.FileName Open OldFile For Append As #1 Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Do While UCase(Day) <> "END" HiTemp = Val(InputBox("Please enter the high temperature:", "High Temp")) Write #1, Day, HiTemp Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Loop Close #1 CancelButton: Exit Sub End Sub

General requirements Documentation requirements. General, quality manual, control of documents, control of records

In addition, new generations of data access APIs are gaining popularity, such as Microsoft s OLE-DB, which is more efficient than ODBC and supports access to SQL data sources and other types of data sources For Java programmers, there is a similar API called JDBC You ll also find that such products as ActiveX Data Object (ADO) provide an object-oriented interface between scripting languages or object-oriented languages and the OLE-DB API Many development tools also make accessing an SQL data source easier than ever For example, Visual Studio NET allows you to build data-driven applications in such languages as Visual Basic, C++, and C# By using the built-in ADONET tools, you can create applications that can access a variety of data sources, such as SQL Server and Oracle..

CLI (Database library)

Figure 17-3

Although Microsoft is generally given credit for ODBC, it was developed by Microsoft in partnership with Simba Technologies, and is based on CLI specifications from the SQL Access Group, X/Open (now part of The Open Group), and the ISO/IEC.

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