/// <summary>
/// Create projections context.
/// </summary>
/// <param name="sql"></param>
/// <param name="selectCommand"></param>
/// <param name="groupByContext"></param>
/// <param name="orderByContext"></param>
/// <returns></returns>
public ProjectionsContext CreateProjectionsContext(string sql, SelectCommand selectCommand, GroupByContext groupByContext, OrderByContext orderByContext)
{
ProjectionsSegment projectionsSegment = selectCommand.Projections;
ICollection <IProjection> projections = GetProjections(sql, selectCommand.GetSimpleTableSegments(), projectionsSegment);
ProjectionsContext result = new ProjectionsContext(projectionsSegment.GetStartIndex(), projectionsSegment.GetStopIndex(), projectionsSegment.IsDistinctRow(), projections);
result.GetProjections().AddAll(GetDerivedGroupByColumns(projections, groupByContext, selectCommand));
result.GetProjections().AddAll(GetDerivedOrderByColumns(projections, orderByContext, selectCommand));
return(result);
}
private string GetAlias(string name)
{
if (_projectionsContext.IsUnqualifiedShorthandProjection())
{
return(null);
}
string rawName = SqlUtil.GetExactlyValue(name);
foreach (var projection in _projectionsContext.GetProjections())
{
if (SqlUtil.GetExactlyExpression(rawName).EqualsIgnoreCase(SqlUtil.GetExactlyExpression(SqlUtil.GetExactlyValue(projection.GetExpression()))))
{
return(projection.GetAlias());
}
if (rawName.EqualsIgnoreCase(projection.GetAlias()))
{
return(rawName);
}
}
return(null);
}
