protected bool ReadUsingUniqueKey(string uniqueColumnName, object value)
{
Initialize();
Fire_ObjectReading();
CSStringCollection keyList = new CSStringCollection(uniqueColumnName);
List <object> valueList = new List <object>();
valueList.Add(value);
if (ReadFields(_schema.ColumnsToRead, keyList, valueList))
{
_dataState = CSObjectDataState.Loaded;
Fire_ObjectRead();
return(true);
}
return(false);
}
internal bool ReadFields(CSStringCollection columnList, CSStringCollection keyList, List <object> valueList)
{
List <string> fieldList = new List <string>();
List <string> aliasList = new List <string>();
Dictionary <string, string> fieldAliasMap = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase);
CSFilter whereClause = new CSFilter();
CSTable table = new CSTable(_schema);
CSParameterCollection parameters = new CSParameterCollection();
foreach (CSSchemaColumn schemaColumn in _schema.Columns)
{
if (keyList.Contains(schemaColumn.Name))
{
CSParameter parameter = parameters.Add();
parameter.Value = valueList[keyList.IndexOf(schemaColumn.Name)];
whereClause = whereClause.And(table.TableAlias + "." + _schema.DB.QuoteField(schemaColumn.Name) + "=" + parameter.Name);
_fieldData["#" + schemaColumn.Name].ValueDirect = parameter.Value;
_fieldData["#" + schemaColumn.Name].ValueState = CSFieldValueState.Read;
}
else if (columnList.Contains(schemaColumn.Name))
{
string alias = CSNameGenerator.NextFieldAlias;
fieldList.Add(table.TableAlias + "." + schemaColumn.Name);
aliasList.Add(alias);
fieldAliasMap[alias] = schemaColumn.Name;
}
}
/** Build query for prefetch of relations **/
CSJoinList joinList = new CSJoinList();
List <PrefetchField> prefetchFields = GetPrefetchFieldsOne(table, fieldList, aliasList, joinList, null);
if (whereClause.Expression.Length == 0)
{
return(false);
}
if (fieldList.Count == 0)
{
return(true);
}
string sqlQuery = _schema.DB.BuildSelectSQL(table.TableName, table.TableAlias, fieldList.ToArray(), aliasList.ToArray(), joinList.BuildJoinExpressions(), whereClause.Expression, null, 1, 1, true, false);
using (CSTransaction csTransaction = new CSTransaction(_schema))
{
using (ICSDbReader dataReader = _schema.DB.CreateReader(sqlQuery, parameters))
{
if (!dataReader.Read())
{
return(false);
}
FromDataReader(dataReader, fieldAliasMap);
foreach (PrefetchField prefetchField in prefetchFields)
{
ReadRelationToOne(prefetchField.SchemaField, dataReader, prefetchField.AliasMap);
}
}
csTransaction.Commit();
}
return(true);
}
