Exemplo n.º 1
0
        private void BuildNormalQuery(ISqlSelectQuery query, BuildQueryContext ctx)
        {
            //设置上下文
            ctx.BeginBuildQuery(query);

            //构建Select
            ctx.Append("Select ");
            if (query.Purpose == QueryPurpose.ToDataTable && query.Distinct)
            {
                ctx.Append("Distinct ");
            }

            //构建Select Items
            ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildSelect;
            if (query.Purpose == QueryPurpose.Count)
            {
                ctx.Append("Count(*)");
            }
            else
            {
                foreach (var si in query.Selects.Values)
                {
                    BuildSelectItem(si, ctx);
                    ctx.Append(",");
                }
                ctx.RemoveLastChar(); //移除最后多余的,号
            }

            //构建From
            ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildFrom;
            ctx.Append(" From ");
            //判断From源
            if (query is SqlFromQuery)
            {
                SqlFromQuery q = (SqlFromQuery)ctx.CurrentQuery;
                //开始构建From子查询
                ctx.Append("(");
                BuildNormalQuery(q.Target, ctx);
                ctx.Append(")");
                ctx.AppendFormat(" {0}", ((SqlQueryBase)q.Target).AliasName);// ((QueryBase)query).AliasName);
            }
            else
            {
                SqlQuery q     = (SqlQuery)ctx.CurrentQuery;
                var      model = Runtime.RuntimeContext.Current.GetModelAsync <EntityModel>(q.T.ModelID).Result;
                ctx.AppendFormat("\"{0}\" {1}", model.GetSqlTableName(false, null), q.AliasName);
            }

            //构建Where
            ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildWhere;
            if (!Equals(null, ctx.CurrentQuery.Filter))
            {
                ctx.Append(" Where ");
                BuildExpression(ctx.CurrentQuery.Filter, ctx);
            }

            //非分组的情况下构建Order By
            if (query.Purpose != QueryPurpose.Count)
            {
                if (query.GroupByKeys == null && query.HasSortItems)
                {
                    ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildOrderBy;
                    BuildOrderBy(query, ctx);
                }
            }

            //构建Join
            ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildJoin;
            SqlQueryBase q1 = (SqlQueryBase)ctx.CurrentQuery;

            if (q1.HasJoins) //先处理每个手工的联接及每个手工联接相应的自动联接
            {
                BuildJoins(q1.Joins, ctx);
            }
            ctx.BuildQueryAutoJoins(q1); //再处理自动联接

            //处理Skip and Take
            if (query.Purpose != QueryPurpose.Count)
            {
                ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildSkipAndTake;
                if (query.SkipSize > 0)
                {
                    ctx.AppendFormat(" Offset {0}", query.SkipSize);
                }
                if (query.Purpose == QueryPurpose.ToSingleEntity)
                {
                    ctx.Append(" Limit 1 ");
                }
                else if (query.TakeSize > 0)
                {
                    ctx.AppendFormat(" Limit {0} ", query.TakeSize);
                }
            }

            //构建分组、Having及排序
            BuildGroupBy(query, ctx);

            //结束上下文
            ctx.EndBuildQuery(query);
        }
Exemplo n.º 2
0
        //With RECURSIVE cte
        //("ID","BaseID","BaseType","ParentID","ManagerID","SortNumber","Disabled","TreeLevel")
        //As
        //(Select t."ID", t."BaseID", t."BaseType", t."ParentID", t."ManagerID", t."SortNumber", t."Disabled",0
        //From "sys.OrgUnit" As t
        //Where t."ParentID" ISNULL
        //Union All
        //Select t."ID", t."BaseID", t."BaseType", t."ParentID", t."ManagerID", t."SortNumber", t."Disabled","TreeLevel" + 1
        //From "sys.OrgUnit" As t Inner Join cte as d On t."ParentID" = d."ID")
        //Select t."ID" "t.ID", t."BaseID" "t.BaseID", t."BaseType" "t.BaseType", t."ParentID" "t.ParentID", t."ManagerID"
        //"t.ManagerID", t."SortNumber" "t.SortNumber", t."Disabled" "t.Disabled" From cte t
        //Order By t."TreeLevel", t."SortNumber"

        private void BuildTreeQuery(ISqlSelectQuery query, BuildQueryContext ctx)
        {
            //注意目前实现仅支持单一主键

            //设置上下文
            ctx.BeginBuildQuery(query);

            ctx.Append("With RECURSIVE cte (");
            ctx.SetBuildStep(BuildQueryStep.BuildWithCTE);
            foreach (var si in query.Selects.Values)
            {
                FieldExpression fsi = si.Expression as FieldExpression;
                if (!Equals(null, fsi) && Equals(fsi.Owner.Owner, null))
                {
                    ctx.AppendFormat("\"{0}\",", ((FieldExpression)si.Expression).Name);
                }
            }
            ctx.Append("\"TreeLevel\") As (Select ");
            //Select Anchor
            ctx.SetBuildStep(BuildQueryStep.BuildSelect);
            BuildCTE_SelectItems(query, ctx);
            ctx.Append("0 From ");
            //From Anchor
            ctx.SetBuildStep(BuildQueryStep.BuildFrom);
            SqlQuery q     = (SqlQuery)query;
            var      model = Runtime.RuntimeContext.Current.GetModelAsync <EntityModel>(q.T.ModelID).Result;

            ctx.AppendFormat("\"{0}\" As {1}", model.GetSqlTableName(false, null), q.AliasName);
            //Where Anchor
            ctx.SetBuildStep(BuildQueryStep.BuildWhere);
            if (!object.Equals(null, query.Filter))
            {
                ctx.Append(" Where ");
                BuildExpression(query.Filter, ctx);
            }
            //End 1
            ctx.CurrentQueryInfo.EndBuidQuery();//ctx.EndBuildQuery(query);

            //Union all
            ctx.SetBuildStep(BuildQueryStep.BuildSelect);
            ctx.Append(" Union All Select ");
            //Select 2
            //ctx.SetBuildStep(BuildQueryStep.BuildSelect);
            BuildCTE_SelectItems(query, ctx);
            ctx.Append("\"TreeLevel\" + 1 From ");
            //From 2
            ctx.SetBuildStep(BuildQueryStep.BuildFrom);
            ctx.AppendFormat("\"{0}\" As {1}", model.GetSqlTableName(false, null), q.AliasName);
            //Inner Join
            ctx.Append(" Inner Join cte as d On ");
            BuildFieldExpression(q.TreeParentIDMember, ctx);
            ctx.Append(" = d.\"Id\") Select "); //TODO:fix pk
            //重新处理SelectItem
            ctx.SetBuildStep(BuildQueryStep.BuildSelect);
            foreach (var si in query.Selects.Values)
            {
                BuildSelectItem(si, ctx);
                ctx.Append(",");
            }
            ctx.RemoveLastChar();
            ctx.Append(" From cte t");
            //构建自动联接Join,主要用于继承的
            ctx.SetBuildStep(BuildQueryStep.BuildJoin);
            ctx.BuildQueryAutoJoins(q); //再处理自动联接

            //最后处理Order By
            ctx.SetBuildStep(BuildQueryStep.BuildOrderBy);
            if (query.HasSortItems)
            {
                ctx.Append(" Order By t.\"TreeLevel\"");
                for (int i = 0; i < query.SortItems.Count; i++)
                {
                    ctx.Append(",");
                    SqlSortItem si = query.SortItems[i];
                    BuildExpression(si.Expression, ctx);
                    if (si.SortType == SortType.DESC)
                    {
                        ctx.Append(" DESC");
                    }
                }
            }

            //End 1
            ctx.EndBuildQuery(query, true);
        }