public object MaxInTree(IConnectionProvider conn, IEntity rootEntity, IDbColumn column, DbRelation recursiveRelation, SearchCondition leafFilter, int beginAtLevel, int endAtLevel)
{
EnsureRecursiveRelation(recursiveRelation);
EnsureValidBeginAndEndLevels(beginAtLevel, endAtLevel);
RecursiveStatement cte = new RecursiveStatement(rootEntity, recursiveRelation);
cte.Select = new SelectStatement(rootEntity.Table, AggregateFunctionFactory.Max(column, null));
cte.Select.Where = CreateWhere(rootEntity, cte, leafFilter, beginAtLevel, endAtLevel);
DataTable result = cte.ExecuteSelect(conn);
return result.Rows[0][0];
}
public int DetermineTreeDepth(IConnectionProvider conn, IEntity rootEntity, DbRelation recursiveRelation)
{
EnsureRecursiveRelation(recursiveRelation);
// select max(level) as maxLevelIndex from hierarchy
RecursiveStatement cte = new RecursiveStatement(rootEntity, recursiveRelation);
cte.Select = new SelectStatement(cte.Hierarchy, AggregateFunctionFactory.Max(cte.Hierarchy.Level, null));
DataTable results = cte.ExecuteSelect(conn);
int highestLevel = (results.Rows[0][0] != DBNull.Value) ? Convert.ToInt32(results.Rows[0][0], CultureInfo.InvariantCulture) : 0;
int depth = highestLevel + 1;
return depth;
}
public int CountTree(IConnectionProvider conn, IEntity rootEntity, DbRelation recursiveRelation, SearchCondition leafFilter, int beginAtLevel, int endAtLevel)
{
EnsureRecursiveRelation(recursiveRelation);
EnsureValidBeginAndEndLevels(beginAtLevel, endAtLevel);
RecursiveStatement cte = new RecursiveStatement(rootEntity, recursiveRelation);
cte.Select = new SelectStatement(rootEntity.Table, AggregateFunctionFactory.Count(null));
cte.Select.Where = CreateWhere(rootEntity, cte, leafFilter, beginAtLevel, endAtLevel);
DataTable result = cte.ExecuteSelect(conn);
int count = Convert.ToInt32(result.Rows[0][0], CultureInfo.InvariantCulture);
return count;
}
public DataTable SelectTree(IConnectionProvider conn, IEntity rootEntity, DbRelation recursiveRelation, SearchCondition leafFilter, OrderByClause sorter, bool sortOnDb, int beginAtLevel, int endAtLevel)
{
EnsureRecursiveRelation(recursiveRelation);
EnsureValidBeginAndEndLevels(beginAtLevel, endAtLevel);
// select target.* from target where exists ... and ...
RecursiveStatement cte = new RecursiveStatement(rootEntity, recursiveRelation);
cte.Select = new SelectStatement(rootEntity.Table, rootEntity.Table.Columns);
cte.Select.Where = CreateWhere(rootEntity, cte, leafFilter, beginAtLevel, endAtLevel);
if (sortOnDb && !OrderByClause.IsNullOrEmpty(sorter))
cte.Select.OrderBy = sorter;
DataTable data = cte.ExecuteSelect(conn);
if (!sortOnDb && !OrderByClause.IsNullOrEmpty(sorter))
data = GenericHierarchicalQueryExecutor.SortDataTable(data, sorter);
return data;
}
