public override object LoadScalar(OPath.OPathQuery query)
{
if (query.QueryType == OPathQueryTypeEnum.Path)
{
query.QueryType = OPathQueryTypeEnum.Expression;
query.Expression = new OPath.Expressions.Call("eval", new Evaluant.OPath.Expressions.Collections.ConstraintCollection(new OPath.Expressions.Constraint[] { query.Path }));
}
SqlMapperTransformer transformer = new SqlMapperTransformer(_Mapping, _Model);
transformer.Dialect = Dialect;
ISQLExpression exp = transformer.TransformScalar(query);
_Connection.Open();
_Transaction = _Connection.BeginTransaction();
object result = null;
try
{
string[] queries = Dialect.RenderQueries(exp);
IDbCommand command = Driver.CreateCommand(queries[queries.Length - 1], _Connection, _Transaction);
if (TraceSqlSwitch.Enabled)
{
TraceHelpler.Trace(command, _Dialect);
}
object res = command.ExecuteScalar();
if (res != DBNull.Value)
result = res;
_Transaction.Commit();
}
catch
{
_Transaction.Rollback();
throw;
}
finally
{
_Connection.Close();
}
// Ensure the result in an Int32 in case of a count()
if (query.Expression.Operands[0] is OPath.Expressions.Function
&& ((OPath.Expressions.Function)query.Expression.Operands[0]).Type == Evaluant.OPath.Expressions.FunctionEnum.Count)
result = Convert.ToInt32(result);
return result;
}
public override void LoadReference(IEnumerable entities, string[] references)
{
// references = null => don't load references
if (references == null)
return;
// Group entities by type
Hashtable orderedEntities = new Hashtable();
foreach (Entity e in entities)
{
if (!orderedEntities.ContainsKey(e.Type))
orderedEntities.Add(e.Type, new EntitySet());
((EntitySet)orderedEntities[e.Type]).Add(e);
e.RemoveReference(references);
}
// Process each entity by type
foreach (string entityType in orderedEntities.Keys)
{
Hashtable entityIndex = new Hashtable();
foreach (Entity entity in ((EntitySet)orderedEntities[entityType]))
entityIndex.Add(entity.Id, entity);
string[] ids = new string[((EntitySet)orderedEntities[entityType]).Count];
int i = 0;
foreach (Entity e in (EntitySet)orderedEntities[entityType])
ids[i++] = e.Id;
string id = String.Join("', '", ids);
Hashtable refs = GetReferenceMappings(entityType, references);
// Process each reference of the current entity type
foreach (string refName in refs.Keys)
{
ReferenceMapping rm = (ReferenceMapping)refs[refName];
Evaluant.Uss.Models.Reference referenceModel =
_Model.GetReference(rm.EntityParent.Type, refName.Substring(refName.LastIndexOf('.') + 1), true);
if (_Mapping.Entities[referenceModel.ParentType] == null)
referenceModel = new Evaluant.Uss.Models.Reference(referenceModel.Name, entityType, referenceModel.ChildType, referenceModel.IsComposition, referenceModel.FromMany, referenceModel.ToMany);
string parentType = entityType;
string opath = String.Concat(parentType, "[ id( '", id, "' ) ].", refName);
OPathQuery opathQuery = new OPathQuery(opath);
opathQuery.Compile();
if (opathQuery.HasErrors)
throw new OPathException(opathQuery);
SqlMapperTransformer transformer = new SqlMapperTransformer(_Mapping, _Model);
transformer.Dialect = _Dialect;
string childType = referenceModel.ChildType;
//StringCollection attributes = new StringCollection();
//if(_Model.GetEntity(rm.EntityChild) != null)
// attributes = GetInheritedAttributes(rm.EntityChild);
//string[] atts = new string[attributes.Count];
//for(i = 0; i < attributes.Count; i++)
// atts[i] = attributes[i];
string[] atts = new string[0];
UnionStatement exp = (UnionStatement)transformer.TransformToSql(opathQuery.Path, atts, new string[] { }, false);
// ToDo : Add expression for children types
IList childrenSubTypes = _Model.GetTree(childType);
foreach (SelectStatement select in exp.SelectExpressions)
{
EntityMapping entityChild = _Mapping.Entities[referenceModel.ChildType];
// Insert the ParentId field in case of generic reference mapping
// Then, we can add the OrderBy clause
for (int pmkIndex = 0; pmkIndex < rm.EntityParent.Ids.Count; pmkIndex++)
{
PrimaryKeyMapping pkm = rm.EntityParent.Ids[pmkIndex];
string parentIdAlias = SqlMapperTransformer.GetParentIdAlias(rm.EntityParent, pkm.Field);
if (!FieldExists(select.SelectList, parentIdAlias))
select.SelectList.Insert(2 + pmkIndex, new Column(pkm, select.TableAlias, parentIdAlias, parentIdAlias));
}
}
if (rm.OrderBy != null && rm.OrderBy != string.Empty)
{
exp.OrderByClause = new OrderByClause(exp);
string[] orderbies = rm.OrderBy.Split(',');
foreach (string orderby in orderbies)
{
string[] orderbyDirection = orderby.Split(' ');
if (orderbyDirection.Length == 1)
exp.OrderByClause.Add(new OrderByClauseColumn(orderbyDirection[0]));
else
exp.OrderByClause.Add(new OrderByClauseColumn(orderbyDirection[0], orderbyDirection[1].ToLower() == "desc"));
}
}
exp.SelectedAllColumns = true;
exp.TableAlias = "q";
_Connection.Open();
_Transaction = _Connection.BeginTransaction();
try
{
foreach (string q in _Dialect.RenderQueries(exp, Driver))
{
IDbCommand command = _Driver.CreateCommand(q, _Connection, _Transaction);
if (TraceSqlSwitch.Enabled)
{
TraceHelpler.Trace(command, _Dialect);
}
using (IDataReader reader = command.ExecuteReader())
{
EntityMapping entityChild = _Mapping.Entities[referenceModel.ChildType];
EntityMapping baseEntityChild = entityChild;
string parentId = String.Empty;
string refId = null; //String.Empty; Empty string can be the value
Entity parentEntity = null, reference = null;
while (reader.Read())
{
string trueType = reader[SqlMapperTransformer.TYPE_ALIAS].ToString();
if (baseEntityChild == null || baseEntityChild.Type != trueType)
entityChild = _Mapping.Entities[trueType];
if (entityChild == null)
throw new MappingNotFoundException(string.Format("The entity [{0}] could not be found the mapping", trueType));
int nbParentIds = _Mapping.Entities[referenceModel.ParentType].Ids.Count;
string[] newParentIds = new string[nbParentIds];
for (int indexId = 0; indexId < nbParentIds; indexId++)
newParentIds[indexId] = reader.GetValue(reader.GetOrdinal("ParentId" + (nbParentIds == 1 ? "" : indexId.ToString()))).ToString().Trim();
string newParentId = string.Join(SqlMapperProvider.IDSEP.ToString(), newParentIds);
int nbChildIds = entityChild.Ids.Count;
string[] newChildIds = new string[nbChildIds];
for (int indexId = 0; indexId < nbChildIds; indexId++)
{
if (entityChild.Ids[indexId].Generator.Name == Evaluant.Uss.SqlMapper.GeneratorMapping.GeneratorType.business)
newChildIds[indexId] = reader[entityChild.GetIdFieldAs(entityChild.Ids[indexId])].ToString().Trim();
else
newChildIds[indexId] = reader.GetValue(1 + nbParentIds + indexId).ToString().Trim();
}
string newReferenceId = string.Join(SqlMapperProvider.IDSEP.ToString(), newChildIds);
// Go the next parent
if (parentId != newParentId)
{
if (parentEntity != null)
parentEntity.State = State.UpToDate;
parentId = newParentId;
parentEntity = entityIndex[parentId] as Entity;
refId = null; //String.Empty; Empty string can be the value
}
// Create a new reference
if (refId != newReferenceId)
{
if (reference != null)
reference.State = State.UpToDate;
reference = new Entity(entityChild.Type);
refId = newReferenceId;
reference.Id = refId;
parentEntity.AddValue(refName, reference, State.UpToDate);
}
ImportAttributes(reader, new string[] { }, _Mapping.Entities[reference.Type], reference, transformer.ColumnAliasMapping);
entityChild = baseEntityChild;
}
if (parentEntity != null)
parentEntity.State = State.UpToDate;
if (reference != null)
reference.State = State.UpToDate;
// mark the reference as loaded for each parentEntity
foreach (Entity e in entities)
if (!e.InferredReferences.Contains(refName))
e.InferredReferences.Add(refName);
}
}
_Transaction.Commit();
}
catch (Exception e)
{
_Transaction.Rollback();
throw e;
}
finally
{
_Connection.Close();
}
}
}
}
public override EntitySet Load(OPathQuery query, string[] attributes, string orderby, int first, int max)
{
if (first <= 0)
throw new ArgumentException("first must be greater than 0");
if (max < 0)
throw new ArgumentException("max must be none negative");
if (max == 0 && first != 1)
throw new ArgumentException("max must be greater than zero if a first index is set");
SqlMapperTransformer transformer = new SqlMapperTransformer(_Mapping, _Model);
transformer.Dialect = _Dialect;
ISQLExpression exp = transformer.TransformToSql((Evaluant.OPath.Expressions.Path)query.Path.Clone(),
attributes,
orderby == null || orderby == String.Empty ? new string[0] : orderby.Split(','),
false);
if (first != 1 || max != 0)
{
OPath.Expressions.Function countFunction = new OPath.Expressions.Function(query.Path, Evaluant.OPath.Expressions.FunctionEnum.Count);
OPath.Expressions.Call callCount = new OPath.Expressions.Call("eval", new Evaluant.OPath.Expressions.Collections.ConstraintCollection(new OPath.Expressions.Constraint[] { countFunction }));
query.Expression = callCount;
int maxEntity = Convert.ToInt32(LoadScalar(query));
if (maxEntity < first)
return new EntitySet(); // paging out of range
if (max == 0)
max = maxEntity;
if (first + max > maxEntity)
max = maxEntity - first + 1;
exp = _Dialect.Page(exp, ((SelectStatement)exp).OrderByClause, first, max);
}
return LoadWithSql(exp, transformer.FullNameAttributes, transformer.ColumnAliasMapping, query.Path.Identifiers.Count > 1);
}
