private bool OleDbSetParameterOrder(Expression node, object[] args)
{
if (node.NodeType == NodeType.Filter)
{
// the parameters in this filter are the next in sequence
Filter filter = (Filter)node;
Expression.EnumNodesCallBack callback = new Expression.EnumNodesCallBack(this.OleDbSetParameterOrderInFilter);
Expression.EnumNodes(filter.Source, callback, null, args);
Expression.EnumNodes(filter.Constraint, callback, null, args);
}
return(true);
}
private bool LinkPropertiesToMap(Expression node, object[] args)
{
if (node.NodeType == NodeType.Filter)
{
Filter filter = (Filter)node;
Expression.EnumNodesCallBack callback = new Expression.EnumNodesCallBack(this.LinkPropertiesToMap);
if (args.Length > 0)
{
Expression.EnumNodes(filter.Source, callback, null, args);
}
// add the new filter to the font of the list
object[] newArgs = new object[args.Length + 1];
Array.Copy(args, 0, newArgs, 1, args.Length);
newArgs[0] = filter;
Expression.EnumNodes(filter.Constraint, callback, null, newArgs);
return(false);
}
else if (node.NodeType == NodeType.Property)
{
Property property = (Property)node;
// determine the level of the filter to link
int level = 0;
if (property.Source.NodeType == NodeType.Parent)
{
level = (property.Source as Parent).Level;
// replace the parent source with a new context for linking
property.Source = new Context();
}
if (level >= args.Length)
{
throw new OPathException("Property '" + property.Name + "' could not be associated to an entity.");
}
// set the context link to the source of the filter
Context context = (Context)property.Source;
context.Link = (args[level] as Filter).Source;
// set the property info
SetPropertyInfo(property);
}
return(true);
}
private void SetParameterOrder(ObjectExpression oe)
{
if (oe.ParameterCount == 0)
{
return;
}
if (_provider.Provider == Provider.Access || _provider.Provider == Provider.OleDb)
{
// the OleDb driver expects the order of parameters to be specified in "subquery major" order (which I consider a *major* design flaw).
// in other words, the order is driven by a post traversal of the select statements (filters), with standard left-to-right order within a given select.
Expression.EnumNodesCallBack postCallback = new Expression.EnumNodesCallBack(this.OleDbSetParameterOrder);
Expression.EnumNodes(oe.Expression, null, postCallback, 0);
}
else // not an OleDb provider
{
// use standard right-to-left order (which the parameters are already in)
for (int i = _parameterTable.Count - 1; i >= 0; i--)
{
_parameterTable[i].Ordinal = i;
}
}
}
private bool LinkPropertiesToMap(Expression node, object[] args)
{
if( node.NodeType == NodeType.Filter )
{
Filter filter = (Filter)node;
Expression.EnumNodesCallBack callback = new Expression.EnumNodesCallBack(this.LinkPropertiesToMap);
if( args.Length > 0 )
{
Expression.EnumNodes(filter.Source, callback, null, args);
}
// add the new filter to the font of the list
object[] newArgs = new object[args.Length + 1];
Array.Copy(args, 0, newArgs, 1, args.Length);
newArgs[0] = filter;
Expression.EnumNodes(filter.Constraint, callback, null, newArgs);
return false;
}
else if( node.NodeType == NodeType.Property )
{
Property property = (Property)node;
// determine the level of the filter to link
int level = 0;
if( property.Source.NodeType == NodeType.Parent )
{
level = (property.Source as Parent).Level;
// replace the parent source with a new context for linking
property.Source = new Context();
}
if( level >= args.Length )
{
throw new OPathException("Property '" + property.Name + "' could not be associated to an entity.");
}
// set the context link to the source of the filter
Context context = (Context)property.Source;
context.Link = (args[level] as Filter).Source;
// set the property info
SetPropertyInfo(property);
}
return true;
}
private void SetParameterOrder(ObjectExpression oe)
{
if( oe.ParameterCount == 0 ) return;
if( _provider.Provider == Provider.Access || _provider.Provider == Provider.OleDb )
{
// the OleDb driver expects the order of parameters to be specified in "subquery major" order (which I consider a *major* design flaw).
// in other words, the order is driven by a post traversal of the select statements (filters), with standard left-to-right order within a given select.
Expression.EnumNodesCallBack postCallback = new Expression.EnumNodesCallBack(this.OleDbSetParameterOrder);
Expression.EnumNodes(oe.Expression, null, postCallback, 0);
}
else // not an OleDb provider
{
// use standard right-to-left order (which the parameters are already in)
for( int i = _parameterTable.Count - 1; i >= 0; i-- )
{
_parameterTable[i].Ordinal = i;
}
}
}
private bool OleDbSetParameterOrder(Expression node, object[] args)
{
if( node.NodeType == NodeType.Filter )
{
// the parameters in this filter are the next in sequence
Filter filter = (Filter)node;
Expression.EnumNodesCallBack callback = new Expression.EnumNodesCallBack(this.OleDbSetParameterOrderInFilter);
Expression.EnumNodes(filter.Source, callback, null, args);
Expression.EnumNodes(filter.Constraint, callback, null, args);
}
return true;
}
