public PropertyPathTraverser(SqlEmitter sqlEmitter)
{
this.sqlEmitter = sqlEmitter;
joinTree = new JoinTree(this);
joinTree.TableMap = sqlEmitter.RootClassMap.MustGetTableMap();
}
public virtual string ToScalarSql(string npath, Type type, ref IList outParameters, IList inParameters)
{
NPathParser parser = new NPathParser() ;
NPathSelectQuery query = parser.ParseSelectQuery(npath, inParameters) ;
IClassMap rootClassMap = this.Context.DomainMap.MustGetClassMap(type);
this.ResultParameters = new ArrayList();
SqlEmitter sqlEmitter = new SqlEmitter(this, query,NPathQueryType.SelectScalar, rootClassMap);
string sql = sqlEmitter.EmitSql();
outParameters = sqlEmitter.ResultParameters;
return sql;
}
private SqlExpression EvalSubQuery(NPathSelectQuery subQuery)
{
NPathClassName className = (NPathClassName) subQuery.From.Classes[0];
string collectionProperty = className.Name;
IPropertyMap rootPropertyMap = this.RootClassMap.MustGetPropertyMap(collectionProperty);
if (!rootPropertyMap.IsCollection)
throw new Exception(string.Format("Property '{0}' or type {1} is not a collection",rootPropertyMap.Name, className.Name) ) ;
IPropertyMap inversePropertyMap = rootPropertyMap.GetInversePropertyMap();
string dataType = rootPropertyMap.ItemType;
className.Name = dataType;
IClassMap classMap = RootClassMap.DomainMap.MustGetClassMap(dataType);
SqlEmitter subEmitter = new SqlEmitter(this.NPathEngine,subQuery,NPathQueryType.SelectTable,classMap,this.Select,inversePropertyMap,this.subQueryLevel + 1) ;
SqlSelectStatement subSelect = subEmitter.BuildSqlDom();
return subSelect;
}
