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There are two overloads for each method that returns column data, one that takes an ordinal column position, and the other that takes the string name of the property. This second overload is a convenience, but makes the code in a business object much more readable. All the methods that return column data are null protected with code like this: public string GetString(string name) { return GetString(_dataReader.GetOrdinal(name)); } public virtual string GetString(int i) { if( _dataReader.IsDBNull(i)) return string.Empty; else return _dataReader.GetString(i); } If the value in the database is null, the method returns some more palatable value typically, whatever passes for empty for the specific data type. If the value isn t null, it simply returns the value from the underlying data reader object. For string values, the empty value is string.Empty; for numeric types, it is 0; and for Boolean types, it is false. You can look at the full code for SafeDataReader to see all the translations. Notice that the GetString() method that actually does the translation of values is marked as virtual. This allows you to override the behavior of any of these methods by creating a subclass of SafeDataReader. The GetOrdinal() method translates the column name into an ordinal (numeric) value, which can be used to actually retrieve the value from the underlying IDataReader object. GetOrdinal() looks like this: public int GetOrdinal(string name) { return _dataReader.GetOrdinal(name); } Every data type supported by IDataReader (and there are a lot of them) has a pair of methods that reads the data from the underling IDataReader object, replacing null values with empty default values as appropriate.

mysql> CREATE AGGREGATE FUNCTION avgcost RETURNS REAL SONAME "expert_udf.dll";

Most types have empty values that are obvious, but DateTime is problematic as it has no empty value: public DateTime GetDateTime(string name) { return GetDateTime(_dataReader.GetOrdinal(name)); } public virtual DateTime GetDateTime(int i) { if (_dataReader.IsDBNull(i)) return DateTime.MinValue; else return _dataReader.GetDateTime(i); } The minimum date value is arbitrarily used as the empty value. This isn t perfect, but it does avoid returning a null value or throwing an exception. A better solution may be to use the SmartDate type instead of DateTime. To simplify retrieval of a date value from the database into a SmartDate, SafeDataReader implements two variations of a GetSmartDate() method: public Csla.SmartDate GetSmartDate(string name) { return GetSmartDate(_dataReader.GetOrdinal(name), true); } public virtual Csla.SmartDate GetSmartDate(int i) { return GetSmartDate(i, true); } public Csla.SmartDate GetSmartDate(string name, bool minIsEmpty) { return GetSmartDate(_dataReader.GetOrdinal(name), minIsEmpty); } public virtual Csla.SmartDate GetSmartDate( int i, bool minIsEmpty) { if (_dataReader.IsDBNull(i)) return new Csla.SmartDate(minIsEmpty); else return new Csla.SmartDate( _dataReader.GetDateTime(i), minIsEmpty); } Data access code in a business object can choose either to accept the minimum date value as being equivalent to empty or to retrieve a SmartDate that understands the concept of an empty date: SmartDate myDate = dr.GetSmartDate(0); or SmartDate myDate = dr.GetSmartDate(0, false);

Like the Server Admin Tools package, there s only one thing you ll need from here----Property List Editor.app. (Technically, you can get by without that as well!) Apple provides the developer tools free of charge. You can either install them from the Mac OS X DVD that came with your computer, or download the most recent version from Apple s developer web site (http://developer.apple.com).

Query OK, 0 rows affected (0.00 sec)

Likewise, there is no empty value for the bool type: public bool GetBoolean(string name) { return GetBoolean(_dataReader.GetOrdinal(name)); } public virtual bool GetBoolean(int i) { if (_dataReader.IsDBNull(i)) return false; else return _dataReader.GetBoolean(i); } The code arbitrarily returns a false value in this case.

Listing 8-4. Uninstalling the Functions mysql> DROP FUNCTION metaphon;

The IDataReader interface also includes a number of methods that don t return column values, such as the Read() method: public bool Read() { return _dataReader.Read(); } In these cases, it simply delegates the method call down to the underlying data reader object for it to handle. Any return values are passed back to the calling code, so the fact that SafeDataReader is involved is entirely transparent. The SafeDataReader class can be used to simplify data access code dramatically, any time an object is working with tables in which null values are allowed in columns where the application doesn t care about the difference between an empty and a null value. If your application does care about the use of null values, you can simply use the regular data reader objects instead.

Query OK, 0 rows affected (0.00 sec)

Later in this chapter, you ll see the implementation of a CslaDataSource control that allows business developers to use Web Forms data binding with CSLA .NET style business objects. When Web Forms data binding needs to insert or update data, it provides the data elements in the form of a dictionary object of name/value pairs. The name is the name of the property to be updated, and the value is the value to be placed into the property of the business object. Copying the values isn t hard the code looks something like this: cust.FirstName = e.Values["FirstName"].ToString(); cust.LastName = e.Values["LastName"].ToString(); cust.City = e.Values["City"].ToString(); Unfortunately, this is tedious code to write and debug; and if your object has a lot of properties, this can add up to a lot of lines of code. An alternative is to use reflection to automate the process of copying the values.