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我有一个抽象父类(Product)和两个从它继承的子类(Book,Software)。我需要将常用数据(父类属性)插入到Products表中,并将子类的特定属性插入到BookProducts和SoftwareProducts表中。将子对象的属性插入数据库的正确方法?
这是我想出的实现,我想知道是否有人可以提供更好的方法。
public static class Database
{
public static void SaveBook(Book book)
{
//save the product to products table and return the ID of the new row
int ProductID = saveProduct(book);
SqlConnection connection = DatabaseConnection.GetConnection();
string insertBookStatement =
"INSERT BookProducts" +
"(ProductID,Author)" +
"VALUES (@ProductID,@Author)";
SqlCommand insertBookCommand = new SqlCommand(insertBookStatement, connection);
insertBookCommand.Parameters.AddWithValue("@ProductID",ProductID);
insertBookCommand.Parameters.AddWithValue("@Author",book.Author);
try
{
connection.Open();
insertBookCommand.ExecuteNonQuery();
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
}
public static void SaveSoftware(Software software)
{
int ProductID = saveProduct(software);
SqlConnection connection = DatabaseConnection.GetConnection();
string insertSoftwareStatement =
"INSERT SoftwareProducts" +
"(ProductID,VersionNumber)" +
"VALUES (@ProductID,@VersionNumber)";
SqlCommand insertSoftwareCommand = new SqlCommand(insertSoftwareStatement, connection);
insertSoftwareCommand.Parameters.AddWithValue("@ProductID", ProductID);
insertSoftwareCommand.Parameters.AddWithValue("@VersionNumber", software.VersionNumber);
try
{
connection.Open();
insertSoftwareCommand.ExecuteNonQuery();
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
}
private static int saveProduct(Product p)
{
int ProductID;
SqlConnection connection = DatabaseConnection.GetConnection();
string insertProductStatement =
"INSERT Products" +
"(Code,Description,Category,Price)" +
"VALUES (@code,@Description,@Category,@Price)";
SqlCommand insertProductCommand = new SqlCommand(insertProductStatement, connection);
insertProductCommand.Parameters.AddWithValue("@Code", p.Code);
insertProductCommand.Parameters.AddWithValue("@Description", p.ShortDescription);
insertProductCommand.Parameters.AddWithValue("@Category", p.Category);
insertProductCommand.Parameters.AddWithValue("@Price", p.Price);
try
{
connection.Open();
insertProductCommand.ExecuteNonQuery();
string selectStatement = "SELECT IDENT_CURRENT('Products') FROM Products";
SqlCommand selectCommand = new SqlCommand(selectStatement, connection);
ProductID = Convert.ToInt16(selectCommand.ExecuteScalar());
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
return ProductID;
}
}
您可以将XML格式传递给存储过程。在SP中,您可以读取XML数据作为表结构。 http://msdn.microsoft.com/en-us/library/ms345117%28v=sql.90%29.aspx – 2012-02-11 15:13:09
更好的方法是使用实体框架。 – 2012-02-11 15:15:06
EF对他的问题没有帮助。该解决方案全部是关于数据建模和软件设计的,选择特定的ORM技术并没有什么帮助。 – Tobias 2012-02-11 16:28:56