/// <summary>
/// Determines if a relationship property refers to a single entity (as opposed to a collection.)
/// </summary>
/// <param name="member"></param>
/// <returns></returns>
public virtual bool IsSingletonAssociation(MetaType type, MemberInfo member)
{
if (!this.IsAssociation(type, member))
return false;
return (TypeExtensions.FindEnumerable(TypeHelper.GetMemberType(member)) == null);
}
public DbTableExpression(DbTableAlias alias,
MetaType type, string name)
: base(DbExpressionType.Table, typeof(void), alias)
{
_type = type;
_name = name;
}
/// <summary>
/// Get an expression that represents the insert operation for the specified instance.
/// </summary>
/// <param name="entity"></param>
/// <param name="instance">The instance to insert.</param>
/// <param name="selector">A lambda expression that computes a return value from the operation.</param>
/// <returns></returns>
public abstract Expression CreateInsertExpression(MetaType type,
Expression instance, LambdaExpression selector);
/// <summary> /// Get an expression for a mapped property relative to a root expression. /// The root is either a TableExpression or an expression defining an entity instance. /// </summary> public abstract Expression CreateMemberExpression(Expression root, MetaType type, MemberInfo member);
/// <summary> /// Gets an expression that constructs an entity instance relative to a root. /// The root is most often a TableExpression, but may be any other experssion such as /// a ConstantExpression. /// </summary> public abstract DbEntityExpression CreateEntityExpression(Expression root, MetaType type);
/// <summary> /// Get a query expression that selects all entities from a table /// </summary> /// <param name="rowType"></param> /// <returns></returns> public abstract DbProjectionExpression CreateProjection(MetaType type);
/// <summary> /// Determines if a property is mapped as a relationship /// </summary> public abstract bool IsAssociation(MetaType type, MemberInfo member);
/// <summary>
/// Get an expression that represents the delete
/// operation for the specified instance.
/// </summary>
public abstract Expression CreateDeleteExpression(MetaType type,
Expression instance, LambdaExpression deleteCheck);
/// <summary>
/// Get an expression that represents the delete
/// operation for the specified instance.
/// </summary>
public abstract Expression CreateDeleteExpression(MetaType type,
Expression instance, LambdaExpression deleteCheck);
/// <summary>
/// Get an expression that represents the insert operation for the specified instance.
/// </summary>
/// <param name="entity"></param>
/// <param name="instance">The instance to insert.</param>
/// <param name="selector">A lambda expression that computes a return value from the operation.</param>
/// <returns></returns>
public abstract Expression CreateInsertExpression(MetaType type,
Expression instance, LambdaExpression selector);
/// <summary> /// Get an expression for a mapped property relative to a root expression. /// The root is either a TableExpression or an expression defining an entity instance. /// </summary> public abstract Expression CreateMemberExpression(Expression root, MetaType type, MemberInfo member);
/// <summary> /// Gets an expression that constructs an entity instance relative to a root. /// The root is most often a TableExpression, but may be any other experssion such as /// a ConstantExpression. /// </summary> public abstract DbEntityExpression CreateEntityExpression(Expression root, MetaType type);
/// <summary> /// Get a query expression that selects all entities from a table /// </summary> /// <param name="rowType"></param> /// <returns></returns> public abstract DbProjectionExpression CreateProjection(MetaType type);
/// <summary> /// Determines if a property is mapped as a relationship /// </summary> public abstract bool IsAssociation(MetaType type, MemberInfo member);
public DbEntityExpression(MetaType entity, Expression expression)
: base(DbExpressionType.Entity, expression.Type)
{
_entity = entity;
_expression = expression;
}
/// <summary>
/// Get an expression that represents the update operation for the specified instance.
/// </summary>
public abstract Expression CreateUpdateExpression(MetaType type, Expression instance,
LambdaExpression updateCheck, LambdaExpression selector, Expression @else);
/// <summary>
/// Get an expression that represents the update operation for the specified instance.
/// </summary>
public abstract Expression CreateUpdateExpression(MetaType type, Expression instance,
LambdaExpression updateCheck, LambdaExpression selector, Expression @else);
