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The accesses to the labels X and Y in the first two definitions have been resolved using the type information provided by the type annotations. The accesses in the third definition have been resolved using the default interpretation of record field labels in the absence of any other qualifying information.

The .NET namespace System.IO contains the primary .NET types for reading/writing bytes and text to/from data sources. The primary output constructs in this namespace are as follows: System.IO.BinaryWriter: Writes primitive data types as binary values. Create using new BinaryWriter(stream). You can create output streams using File.Create(filename). System.IO.StreamWriter: Writes textual strings and characters to a stream. The text is encoded according to a particular Unicode encoding. Create by using new StreamWriter(stream) and its variants or by using File.CreateText(filename). System.IO.StringWriter: Writes textual strings to a StringBuilder, which eventually can be used to generate a string.

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else { return (""); } } MYSQL_RES *ExecQuery(char *Query) { mysql_dbug_print("ExecQuery"); mysql_free_result(results); mysql_query(mysql, Query); return (mysql_store_result(mysql)); } #pragma managed One thing you should notice about this code is all of the error handling that I ve added to make the code more robust, or hardened While I do not have all of the possible error handlers implemented, the most important ones are The get methods are all implemented using the same process I first generate the appropriate query (and thereby hide the SQL statement from the client), execute the query, retrieve the result set and then the record from the query, and return the value One method that is of interest is VendBook() Take a moment and look through that one again.

Records support a convenient syntax to clone all the values in the record, creating a new value with some values replaced. Here is a simple example: type Point3D = { X: float; Y: float; Z: float } let p1 = { X=3.0; Y=4.0; Z=5.0 } > let p2 = { p1 with Y=0.0; Z=0.0 };; val p2 : Point3D The definition of p2 is identical to this: let p2 = { X=p1.X; Y=0.0; Z=0.0 } This expression form doesn t mutate the values of a record, even if the fields of the original record are mutable.

Here is a simple example of using System.IO.File.CreateText to create StreamWriter and write two strings: > let outp = File.CreateText("playlist.txt");; val outp : StreamWriter > outp.WriteLine("Enchanted");; val it : unit = () > outp.WriteLine("Put your records on");; val it : unit = () > outp.Close(); These are the primary input constructs in the System.IO namespace: System.IO.BinaryReader: Reads primitive data types as binary values. When reading the binary data as a string, it interprets the bytes according to a particular Unicode encoding. Create using new BinaryReader(stream). System.IO.StreamReader: Reads a stream as textual strings and characters. The bytes are decoded to strings according to a particular Unicode encoding. Create by using new StreamReader(stream) and its variants or by using File.OpenText(filename). System.IO.StringReader: Reads a string as textual strings and characters. Here is a simple example of using System.IO.File.OpenText to create a StreamReader and read two strings: > let inp = File.OpenText("playlist.txt");; val inp : StreamReader > inp.ReadLine();; val it : string = "Enchanted" > inp.ReadLine();; val it : string = "Put your records on" > inp.Close();; val it : unit = ()

You ll see that I ve followed a similar method of generating the query, but this time I don t get the results because there aren t any Actually, there is a result it is the number of records affected This could be handy if you wanted to do some additional process or rule checking in your application The rest of the methods should look familiar to you as they are all copies of the original example I showed you except this time they have error handling included Now, let s take a look at how the user interface code calls the database class Customer Interface (Main Form) The source code for the customer interface is very large This is due to the auto-generated code that Microsoft places in the formh file I m including only those portions that I wrote.

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