/// <summary>
/// Query and return first data
/// </summary>
/// <typeparam name="T">Data type.</typeparam>
/// <returns>First data</returns>
public T QueryFirst <T>()
{
T target = _context.QueryDataDefineSingle <T>(DataEntityMapping.GetEntityMapping(typeof(T)), _level, _command, 0, null, null);
Callback();
return(target);
}
/// <summary>
/// Query and return data list
/// </summary>
/// <typeparam name="T">Data type.</typeparam>
/// <param name="region">Query region</param>
/// <param name="cancellationToken">CancellationToken.</param>
/// <returns>Data list</returns>
private async Task <List <T> > QueryListAsync <T>(Region region, CancellationToken cancellationToken = default(CancellationToken))
{
List <T> list = await _context.QueryDataDefineListAsync <T>(DataEntityMapping.GetEntityMapping(typeof(T)), _level, _command, region, null, null, cancellationToken);
Callback();
return(list);
}
/// <summary>
/// Query and return first data
/// </summary>
/// <typeparam name="T">Data type.</typeparam>
/// <param name="cancellationToken">CancellationToken.</param>
/// <returns>First data</returns>
public async Task <T> QueryFirstAsync <T>(CancellationToken cancellationToken = default(CancellationToken))
{
T target = await _context.QueryDataDefineSingleAsync <T>(DataEntityMapping.GetEntityMapping(typeof(T)), _level, _command, 0, null, null, cancellationToken);
Callback();
return(target);
}
/// <summary>
/// Query and return data enumerable
/// </summary>
/// <typeparam name="T">Data type.</typeparam>
/// <param name="region">Data region</param>
/// <returns>Data enumerable</returns>
private IEnumerable <T> Query <T>(Region region)
{
IEnumerable <T> enumable = _context.QueryDataDefineReader <T>(DataEntityMapping.GetEntityMapping(typeof(T)), _level, _command, region, null, null);
Callback();
return(enumable);
}
/// <summary>
/// Query and return data list
/// </summary>
/// <typeparam name="T">Data type.</typeparam>
/// <param name="region">Query region</param>
/// <returns>Data list</returns>
private List <T> QueryList <T>(Region region)
{
List <T> list = _context.QueryDataDefineList <T>(DataEntityMapping.GetEntityMapping(typeof(T)), _level, _command, region, null, null);
Callback();
return(list);
}
public SingleParameterLambdaState(ParameterExpression parameter)
{
_singleEntityName = parameter.Name;
var entityMapping = DataEntityMapping.GetEntityMapping(parameter.Type);
_singleEntityMap = entityMapping.GetRelationMap();
}
public RelateParameterLambdaState(ParameterExpression parameter, LambdaState state)
{
var entityMapping = DataEntityMapping.GetEntityMapping(parameter.Type);
_singleEntityName = parameter.Name;
_singleEntityMap = entityMapping.GetRelationMap();
_state = state;
}
public SingleParameterLambdaState(ParameterExpression parameter)
{
this.singleEntityName = parameter.Name;
Type type = parameter.Type;
DataEntityMapping entityMapping = DataEntityMapping.GetEntityMapping(type);
this.singleEntityMap = entityMapping.GetRelationMap();
}
protected virtual void InitialRelateMappingInc()
{
DataEntityMapping mapping = DataEntityMapping.GetEntityMapping(this.relateType);
DataFieldInfo [] infos = new DataFieldInfo [keyPairs.Length];
DataFieldMapping [] fields = new DataFieldMapping [keyPairs.Length];
for (int i = 0; i < this.keyPairs.Length; i++)
{
DataFieldMapping field = mapping.FindDataEntityField(keyPairs [i].RelateKey);
if (field == null)
{
throw new LightDataException(string.Format(SR.CanNotFindTheSpecifiedField, mapping.ObjectType, keyPairs[i].RelateKey));
}
fields [i] = field;
infos [i] = new DataFieldInfo(field);
}
this.relateInfos = infos;
this.relateFieldMappings = fields;
this.relateEntityMapping = mapping;
}
protected QueryBase(DataContext dataContext)
{
_context = dataContext;
_mapping = DataEntityMapping.GetEntityMapping(typeof(T));
}
public override IAggregate <K> OrderByRandom()
{
_order = new RandomOrderExpression(DataEntityMapping.GetEntityMapping(typeof(T)));
return(this);
}
protected SelectBase(DataContext context, LambdaExpression expression, Type type)
{
_context = context;
_expression = expression;
Mapping = DataEntityMapping.GetEntityMapping(type);
}
internal DataFieldInfo(Type type, string name)
: this(DataEntityMapping.GetEntityMapping(type), false, name)
{
}
