public JoinTableQueryPart(QueryIdentifier targetTable,
QueryIdentifier sourceTable,
QueryIdentifier joinAlias,
Type targetTargetTableType,
ColumnInfo targetColumn,
ColumnInfo sourceColumn,
IEnumerable <ColumnInfo> columns,
DbPropertyInfoCache targetProperty,
JoinMode joinAs)
{
_joinAs = joinAs;
TargetTable = targetTable;
SourceTable = sourceTable;
Alias = joinAlias;
TargetTableType = targetTargetTableType;
Columns = columns;
TargetColumn = targetColumn;
SourceColumn = sourceColumn;
DependingJoins = new List <JoinTableQueryPart>();
var joinInfos = new JoinParseInfo();
joinInfos.TargetProperty = targetProperty;
joinInfos.Columns = Columns;
joinInfos.Alias = Alias;
joinInfos.SourceColumnName = SourceColumn;
joinInfos.TargetColumnName = TargetColumn;
joinInfos.SourceTable = SourceTable;
joinInfos.TargetTableType = targetTargetTableType;
JoinParseInfo = joinInfos;
}
private void CreateJoinMapping(
JoinParseInfo joinTableQueryPart,
EagarDataRecord[] readers,
Type entityType,
QueryProcessingRecordsContext context)
{
var parentedReaders = new List <EagarDataRecord>();
var property = joinTableQueryPart.TargetProperty;
var sourceColumn = joinTableQueryPart.TargetColumnName;
var targetColumn = joinTableQueryPart.SourceColumnName;
if (sourceColumn == null)
{
throw new InvalidOperationException();
}
if (targetColumn == null)
{
throw new InvalidOperationException();
}
var fields = joinTableQueryPart.Columns.ToArray();
var fieldsOfChild = fields
.Select((item, index) => item.ColumnIdentifier())
.ToArray();
var columnMapping = new Dictionary <string, int>();
var sourceColumnsIndexMapping = context.Columns.ToArray().Select((item, index) => new
{
item,
index
}).ToDictionary(e => e.item, e => e.index);
foreach (var fieldOfChild in fieldsOfChild)
{
var child = fieldOfChild;
var indexOfSource =
sourceColumnsIndexMapping
.FirstOrDefault(e => e.Key.ColumnIdentifier().Equals(child));
if (columnMapping.ContainsKey(indexOfSource.Key.NaturalName))
{
throw new InvalidOperationException($"Column name collision detected. Column '{indexOfSource.Key.NaturalName}'")
{
Data =
{
{ "Columns", sourceColumnsIndexMapping },
{ "Field", indexOfSource },
}
};
}
columnMapping.Add(indexOfSource.Key.NaturalName, indexOfSource.Value);
}
var groupBy = columnMapping[columnMapping.FirstOrDefault().Key];
//TODO might not be the PrimaryKey of the foreign table
var readerGroups = readers
.GroupBy(e => e[groupBy])
.Select(e => e.First())
.ToArray();
foreach (var readerGroup in readerGroups)
{
var naturalReader = new EagarDataRecord(columnMapping.Keys.ToArray(),
new ArrayList(columnMapping.Values.Select(f => readerGroup[f]).ToArray()));
parentedReaders.Add(naturalReader);
}
Mappings.Add(new RelationMapping()
{
TargetColumns = joinTableQueryPart.Columns,
SourceColumns = context.Columns
.Where(e => e.Alias.Equals(joinTableQueryPart.SourceTable))
.ToArray(),
Records = parentedReaders.ToArray(),
SourceColumn = sourceColumn,
TargetColumn = targetColumn,
TargetName = property.PropertyName,
TargetType = entityType,
SourceAlias = joinTableQueryPart.Alias,
TargetAlias = joinTableQueryPart.SourceTable
});
if (readerGroups.Any())
{
foreach (var subJoinTableQueryPart in joinTableQueryPart.DependingJoins)
{
CreateJoinMapping(subJoinTableQueryPart,
readers,
subJoinTableQueryPart.TargetTableType,
context);
}
}
foreach (var eagarDataRecord in readers)
{
foreach (var columnInfo in joinTableQueryPart.Columns)
{
//eagarDataRecord.Remove(columnInfo.ColumnIdentifier());
eagarDataRecord.Remove(columnInfo.ColumnIdentifier().TrimAlias());
}
}
context.Columns = context.Columns
.Except(joinTableQueryPart.Columns)
.ToArray();
}
public RelationProcessor(JoinParseInfo joinTableQueryPart)
{
_joinTableQueryPart = joinTableQueryPart;
Mappings = new List <RelationMapping>();
}