Writing and mapping classes in Visual C#

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Writing and mapping classes
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Using quoted SQL identifiers
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By default, NHibernate doesn t quote table and column names in the generated SQL. This makes the SQL slightly more readable and also lets you take advantage of the fact that most SQL databases are case insensitive when comparing unquoted identifiers. From time to time, especially in legacy databases, you ll encounter identifiers with strange characters or whitespace, or you may wish to force case sensitivity. If you quote a table or column name with backticks in the mapping document, NHibernate always quotes this identifier in the generated SQL. The following property declaration forces NHibernate to generate SQL with the quoted column name "Item Description". NHibernate also knows that Microsoft SQL Server needs the variation [Item Description] and that MySQL requires `Item Description`:
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<property name="Description" column="`Item Description`"/>
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There is no way, apart from quoting all table and column names in backticks, to force NHibernate to use quoted identifiers everywhere. NHibernate gives you further control when mapping between your domain model and the database schema, by also letting you control naming conventions. We discuss this next.
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Naming conventions
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Development teams must often follow strict conventions for table and column names in their databases. NHibernate provides a feature that lets you enforce naming standards automatically. Suppose that all table names in CaveatEmptor should follow the pattern CE_<table name>. One solution is to manually specify a table attribute on all <class> and collection elements in your mapping files. This approach is time consuming and easily forgotten. Instead, you can implement NHibernate s INamingStrategy interface, as in listing 3.6.
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Listing 3.6 INamingStrategy implementation
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public class CENamingStrategy : INamingStrategy { public string ClassToTableName(string className) { return TableName( StringHelper.Unqualify(className).ToUpper() ); } public string PropertyToColumnName(string propertyName) { return propertyName.ToUpper (); } public string TableName(string tableName) { return "CE_" + tableName; } public string ColumnName(string columnName) { return columnName;
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Basic property and class mappings
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public string PropertyToTableName(string className, string propertyName) { return ClassToTableName(className) + '_' + PropertyToColumnName(propertyName); } }
The ClassToTableName() method is called only if a <class> mapping doesn t specify an explicit table name. The PropertyToColumnName() method is called if a property has no explicit column name. The TableName() and ColumnName() methods are called when an explicit name is declared. If you enable CENamingStrategy, this class mapping declaration
<class name="BankAccount">
results in CE_BANKACCOUNT as the name of the table. The ClassToTableName() method is called with the fully qualified class name as the argument. But if you specify a table name
<class name="BankAccount" table="BANK_ACCOUNT">
then CE_BANK_ACCOUNT is the name of the table. In this case, BANK_ACCOUNT is passed to the TableName() method. The best feature of INamingStrategy is the potential for dynamic behavior. To activate a specific naming strategy, you can pass an instance to the NHibernate Configuration at runtime:
Configuration cfg = new Configuration(); cfg.NamingStrategy = new CENamingStrategy(); ISessionFactory sessionFactory = cfg.configure().BuildSessionFactory();
This lets you have multiple ISessionFactory instances based on the same mapping documents, each using a different INamingStrategy. This is extremely useful in a multiclient installation where unique table names (but the same data model) are required for each client. But a better way to handle this kind of requirement is to use the concept of a SQL schema (a kind of namespace).
SQL schemas
SQL schemas are a feature available in many databases, including SQL Server 2005 and MySQL. They let you organize your database objects into meaningful groups. For example, the AdventureWorks sample database that comes with Microsoft SQL Server 2005
defines five schemas: Human Resources, Person, Production, Purchasing, and Sales. All these schemas live in a single database, and each has its own tables, views and other database objects. Many databases are designed with only one schema. You can specify a default schema using the hibernate.default_schema configuration option; doing so offers some small performance benefits.
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