/// <summary>
/// 获得指定类型的数据表映射信息对象
/// </summary>
/// <param name="ObjectType">对象类型</param>
/// <returns>获得的映射信息对象</returns>
/// <remarks>
/// 本函数内部使用了 myBufferedInfos 来缓存信息，提高性能。
/// </remarks>
private TableBindInfo GetBindInfo(Type ObjectType)
{
if (ObjectType == null)
{
throw new ArgumentNullException("OjbectType");
}
// 查找已缓存的映射信息对象
TableBindInfo info = ( TableBindInfo )myBufferedInfos[ObjectType];
if (info != null)
{
return(info);
}
// 若未找到则创建新的映射信息对象
BindTableAttribute ta = ( BindTableAttribute )System.Attribute.GetCustomAttribute(
ObjectType, typeof(BindTableAttribute));
if (ta == null)
{
return(null);
}
TableBindInfo NewInfo = new TableBindInfo();
NewInfo.ObjectType = ObjectType;
NewInfo.Attribute = ta;
NewInfo.TableName = ta.Name;
if (NewInfo.TableName == null || NewInfo.TableName.Trim().Length == 0)
{
// 若在特性中没有指明绑定的表名则使用默认的对象类型名称
NewInfo.TableName = ObjectType.Name;
}
System.Text.StringBuilder myFieldList = new System.Text.StringBuilder();
System.Collections.ArrayList fields = new System.Collections.ArrayList();
// 遍历所有的公开的实例属性来获得字段绑定信息
foreach (System.Reflection.PropertyInfo p in ObjectType.GetProperties(
System.Reflection.BindingFlags.Instance
| System.Reflection.BindingFlags.Public
))
{
BindFieldAttribute fa = ( BindFieldAttribute )Attribute.GetCustomAttribute(
p, typeof(BindFieldAttribute));
if (fa != null)
{
FieldBindInfo NewFieldInfo = new FieldBindInfo();
NewFieldInfo.Attribute = fa;
NewFieldInfo.FieldName = fa.Name;
if (NewFieldInfo.FieldName == null || NewFieldInfo.FieldName.Trim().Length == 0)
{
// 若在特性中没有指明绑定的字段名则使用默认的属性名称
NewFieldInfo.FieldName = p.Name;
}
if (myFieldList.Length > 0)
{
myFieldList.Append(",");
}
myFieldList.Append(FixFieldName(NewFieldInfo.FieldName));
NewFieldInfo.Property = p;
NewFieldInfo.ValueType = p.PropertyType;
NewFieldInfo.DefaultValue = GetDefaultValue(p);
fields.Add(NewFieldInfo);
}
}
NewInfo.Fields = ( FieldBindInfo[])fields.ToArray(typeof(FieldBindInfo));
NewInfo.FieldNameList = myFieldList.ToString();
// 缓存绑定信息对象
myBufferedInfos[ObjectType] = NewInfo;
return(NewInfo);
}
/// <summary>
/// ���ָ�����͵����ݱ�ӳ����Ϣ����
/// </summary>
/// <param name="ObjectType">��������</param>
/// <returns>��õ�ӳ����Ϣ����</returns>
/// <remarks>
/// �������ڲ�ʹ���� myBufferedInfos ��������Ϣ��������ܡ�
/// </remarks>
private TableBindInfo GetBindInfo( Type ObjectType )
{
if( ObjectType == null )
{
throw new ArgumentNullException("OjbectType");
}
// �����ѻ����ӳ����Ϣ����
TableBindInfo info = ( TableBindInfo ) myBufferedInfos[ ObjectType ] ;
if( info != null )
{
return info ;
}
// ��δ�ҵ����µ�ӳ����Ϣ����
BindTableAttribute ta = ( BindTableAttribute ) System.Attribute.GetCustomAttribute(
ObjectType , typeof( BindTableAttribute ));
if( ta == null )
{
return null;
}
TableBindInfo NewInfo = new TableBindInfo();
NewInfo.ObjectType = ObjectType ;
NewInfo.Attribute = ta ;
NewInfo.TableName = ta.Name ;
if( NewInfo.TableName == null || NewInfo.TableName.Trim().Length == 0 )
{
// ����������û��ָ���ı�����ʹ��Ĭ�ϵĶ�����������
NewInfo.TableName = ObjectType.Name ;
}
System.Text.StringBuilder myFieldList = new System.Text.StringBuilder();
System.Collections.ArrayList fields = new System.Collections.ArrayList();
// �������еĹ�����ʵ������������ֶΰ���Ϣ
foreach( System.Reflection.PropertyInfo p in ObjectType.GetProperties(
System.Reflection.BindingFlags.Instance
| System.Reflection.BindingFlags.Public
))
{
BindFieldAttribute fa = ( BindFieldAttribute ) Attribute.GetCustomAttribute(
p , typeof( BindFieldAttribute ));
if( fa != null )
{
FieldBindInfo NewFieldInfo = new FieldBindInfo();
NewFieldInfo.Attribute = fa ;
NewFieldInfo.FieldName = fa.Name ;
if( NewFieldInfo.FieldName == null || NewFieldInfo.FieldName.Trim().Length == 0 )
{
// ����������û��ָ�����ֶ�����ʹ��Ĭ�ϵ���������
NewFieldInfo.FieldName = p.Name ;
}
if( myFieldList.Length > 0 )
{
myFieldList.Append(",");
}
myFieldList.Append( FixFieldName( NewFieldInfo.FieldName ) ) ;
NewFieldInfo.Property = p ;
NewFieldInfo.ValueType = p.PropertyType ;
NewFieldInfo.DefaultValue = GetDefaultValue( p );
fields.Add( NewFieldInfo );
}
}
NewInfo.Fields = ( FieldBindInfo[]) fields.ToArray( typeof( FieldBindInfo ));
NewInfo.FieldNameList = myFieldList.ToString();
// �������Ϣ����
myBufferedInfos[ ObjectType ] = NewInfo ;
return NewInfo ;
}
