public SelectCommandContext(SchemaMetaData schemaMetaData, string sql, ParameterContext parameterContext, SelectCommand sqlCommand) : base(sqlCommand)
{
_tablesContext = new TablesContext(sqlCommand.GetSimpleTableSegments());
_groupByContext = new GroupByContextEngine().CreateGroupByContext(sqlCommand);
_orderByContext = new OrderByContextEngine().CreateOrderBy(sqlCommand, _groupByContext);
_projectionsContext = new ProjectionsContextEngine(schemaMetaData).CreateProjectionsContext(sql, sqlCommand, _groupByContext, _orderByContext);
_paginationContext = new PaginationContextEngine().CreatePaginationContext(sqlCommand, _projectionsContext, parameterContext);
_containsSubQuery = ContainsSubQuery();
}
// TODO to be remove, for test case only
public SelectCommandContext(SelectCommand sqlCommand, GroupByContext groupByContext,
OrderByContext orderByContext, ProjectionsContext projectionsContext, PaginationContext paginationContext) : base(sqlCommand)
{
_tablesContext = new TablesContext(sqlCommand.GetSimpleTableSegments());
this._groupByContext = groupByContext;
this._orderByContext = orderByContext;
this._projectionsContext = projectionsContext;
this._paginationContext = paginationContext;
_containsSubQuery = ContainsSubQuery();
}
/// <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 IsRowNumberAlias(ProjectionsContext projectionsContext)
{
foreach (var item in ROW_NUMBER_IDENTIFIERS)
{
var alias = projectionsContext.FindAlias(item);
if (alias != null)
{
return(alias);
}
}
return(null);
}
public UsageRepository(ProjectionsContext dbContext)
{
_dbContext = dbContext;
}
/**
* Create pagination context.
*
* @param andPredicates and predicates
* @param projectionsContext projections context
* @param parameters SQL parameters
* @return pagination context
*/
public PaginationContext CreatePaginationContext(ICollection <AndPredicateSegment> andPredicates, ProjectionsContext projectionsContext, ParameterContext parameterContext)
{
var rowNumberAlias = IsRowNumberAlias(projectionsContext);
if (rowNumberAlias == null)
{
return(new PaginationContext(null, null, parameterContext));
}
ICollection <PredicateSegment> rowNumberPredicates = GetRowNumberPredicates(andPredicates, rowNumberAlias);
return(!rowNumberPredicates.Any() ? new PaginationContext(null, null, parameterContext) : CreatePaginationWithRowNumber(rowNumberPredicates, parameterContext));
}
public PaginationContext CreatePaginationContext(SelectCommand selectCommand, ProjectionsContext projectionsContext, ParameterContext parameterContext)
{
var limitSegment = selectCommand.Limit;
if (limitSegment != null)
{
return(new ParserBinder.Segment.Select.Pagination.Engine.LimitPaginationContextEngine().CreatePaginationContext(limitSegment, parameterContext));
}
var topProjectionSegment = FindTopProjection(selectCommand);
var whereSegment = selectCommand.Where;
if (topProjectionSegment != null)
{
return(new TopPaginationContextEngine().CreatePaginationContext(
topProjectionSegment, whereSegment?.GetAndPredicates() ?? new List <AndPredicateSegment>(0), parameterContext));
}
if (whereSegment != null)
{
return(new RowNumberPaginationContextEngine().CreatePaginationContext(whereSegment.GetAndPredicates(), projectionsContext, parameterContext));
}
return(new PaginationContext(null, null, parameterContext));
}
