/// <summary>
/// Creates a primary key filter based on an entity.
/// </summary>
/// <param name="entity">The entity to read from.</param>
/// <returns></returns>
public ClassFilter CreatePrimaryKeyFilter(object entity)
{
if (_PrimaryKeys.Count == 0)
{
return(null);
}
else
{
ClassFilterTerm first = new ClassFilterTerm(
this,
_PrimaryKeys.First.Value,
base[_PrimaryKeys.First.Value].GetValue(entity));
if (_PrimaryKeys.Count == 1)
{
return(first);
}
else
{
ClassFilterExpression exp = new ClassFilterExpression(first);
for (LinkedListNode <int> node = _PrimaryKeys.First.Next; node != null; node = node.Next)
{
exp.And(node.Value, base[node.Value].GetValue(entity));
}
return(exp);
}
}
}
public ClassFilter CreateSearchFilter(DataAspect aspect, string filter)
{
if (string.IsNullOrEmpty(filter))
{
return(null);
}
else if (filter.Length < 3)
{
filter = filter + "%";
}
else
{
filter = "%" + filter.Replace(' ', '%') + "%";
}
Type stringType = typeof(string);
ClassFilterExpression expression = null;
DataAspect dataAspect = aspect;
int count = dataAspect.Count;
for (int i = 0; i < count; i++)
{
//if (dataAspect[i].DataType == stringType)
expression =
expression == null ?
new ClassFilterExpression(dataAspect, i, FilterComparison.Like, filter) :
expression.Or(i, FilterComparison.Like, filter);
}
return(expression);
}
public ClassSelect <T> Search(string filter, params string[] fields)
{
if (string.IsNullOrEmpty(filter))
{
return(this);
}
else
{
ClassFilterExpression expression = new ClassFilterExpression(this._Aspect, fields[0], FilterComparison.Like, filter);
for (int i = 1; i < fields.Length; i++)
{
expression.Or(fields[i], FilterComparison.Like, filter);
}
if (this._WhereFirst == null)
{
return(Where(expression));
}
else
{
return(And(expression));
}
}
}
public virtual void AppendFilterExpression(StringBuilder builder, DataAspect aspect, ClassFilterExpression expression)
{
builder.Append("(");
AppendFilterNodes(builder, aspect, expression.First);
builder.Append(")");
}