XMLデータを生成する際の行数をカウントする

Question

XMLを生成しています。私は何らかの種類のシーケンスを作成する必要があります。 rownumやrow_number（）のようなもの。

select XMLROOT (xmlagg(
         xmlelement(
         "table_description", 
          xmlelement(
          "table_name", 
          max(table_name) 
         ), 
          xmlelement(
          "table_sequence" 
         ), 
          xmlelement(
          "table_columns", 
          xmlagg(
           xmlforest(
           column_name as "column_name", 
           '' as "column_sequence" 
          ) 
          ) 
         ) 
        ) 
       ), VERSION '1.0', STANDALONE YES) 
    from all_tab_columns 
    where owner='SYS' 
    and table_name in ('ALL_APPLY_ENQUEUE','ALL_APPLY_EXECUTE','ALL_APPLY_KEY_COLUMNS') 
    group by table_name; 

だから、このクエリでは、たとえば私は1つずつ増加しますが、次の時にリセットされますCOLUMN_NAMEの反復ごとに1ずつ増加する各table_nameの要素の一つの配列、1つのシーケンスを追加したいと思いますグループ化。

擬似コード

<table_description> 
    <table_sequence>1</table_sequence> 
    <table_name>xyz</table_name> 
    <table_columns> 
    <column_sequence>1</column_sequence> 
    <column_name>Column One</column_name> 
    <column_sequence>2</column_sequence> 
    <column_name>Column two</column_name> 
    </table_columns> 
<table_description> 
    <table_sequence>2</table_sequence> 
    <table_name>abs</table_name> 
    <table_columns> 
    <column_sequence>1</column_sequence> 
    <column_name>Column One</column_name> 
    <column_sequence>2</column_sequence> 
    <column_name>Column two</column_name> 
    </table_columns> 
<table_description> 

Answer 1

あなたのfrom all_tab_columnsdense_rank()を経由してシーケンス番号を生成し、インライン・ビューに変更することができます。

from (
    select atc.*, 
    dense_rank() over (order by table_name) as table_sequence, 
    dense_rank() over (partition by table_name order by column_name) as column_sequence 
    from all_tab_columns atc 
    where owner='SYS' 
    and table_name in ('ALL_APPLY_ENQUEUE','ALL_APPLY_EXECUTE','ALL_APPLY_KEY_COLUMNS') 
) 

そして、あなたは、あなたのXMLでそれらの生成された列を使用することができます。

select XMLROOT (xmlagg(
        xmlelement(
        "table_description", 
         xmlelement(
         "table_name", 
         table_name 
        ), 
         xmlelement(
         "table_sequence", 
         table_sequence 
        ), 
         xmlelement(
         "table_columns", 
         xmlagg(
          xmlforest(
          column_name as "column_name", 
          column_sequence as "column_sequence" 
         ) 
         ) 
        ) 
       ) 
      ), VERSION '1.0', STANDALONE YES) 
from (
    select atc.*, 
    dense_rank() over (order by table_name) as table_sequence, 
    dense_rank() over (partition by table_name order by column_name) as column_sequence 
    from all_tab_columns atc 
    where owner='SYS' 
    and table_name in ('ALL_APPLY_ENQUEUE','ALL_APPLY_EXECUTE','ALL_APPLY_KEY_COLUMNS') 
) 
where owner='SYS' 
and table_name in ('ALL_APPLY_ENQUEUE','ALL_APPLY_EXECUTE','ALL_APPLY_KEY_COLUMNS') 
group by table_name, table_sequence; 

：

<?xml version="1.0" standalone="yes"?> 
<table_description> 
    <table_name>ALL_APPLY_ENQUEUE</table_name> 
    <table_sequence>1</table_sequence> 
    <table_columns> 
    <column_name>DESTINATION_QUEUE_NAME</column_name> 
    <column_sequence>1</column_sequence> 
    <column_name>RULE_OWNER</column_name> 
    <column_sequence>3</column_sequence> 
    <column_name>RULE_NAME</column_name> 
    <column_sequence>2</column_sequence> 
    </table_columns> 
</table_description> 
<table_description> 
    <table_name>ALL_APPLY_EXECUTE</table_name> 
    <table_sequence>2</table_sequence> 
    <table_columns> 
    <column_name>EXECUTE_EVENT</column_name> 
    <column_sequence>1</column_sequence> 
    <column_name>RULE_OWNER</column_name> 
    <column_sequence>3</column_sequence> 
    <column_name>RULE_NAME</column_name> 
    <column_sequence>2</column_sequence> 
    </table_columns> 
</table_description> 
<table_description> 
    <table_name>ALL_APPLY_KEY_COLUMNS</table_name> 
    <table_sequence>3</table_sequence> 
    <table_columns> 
    <column_name>APPLY_DATABASE_LINK</column_name> 
    <column_sequence>1</column_sequence> 
    <column_name>OBJECT_OWNER</column_name> 
    <column_sequence>4</column_sequence> 
    <column_name>OBJECT_NAME</column_name> 
    <column_sequence>3</column_sequence> 
    <column_name>COLUMN_NAME</column_name> 
    <column_sequence>2</column_sequence> 
    </table_columns> 
</table_description> 

生成されたXMLは、各列とそのシーケンス番号の間にリンクが存在しないため、まだ正しくありません。

select XMLROOT (xmlagg(
        xmlelement(
        "table_description", 
         xmlelement(
         "table_name", 
         table_name 
        ), 
         xmlelement(
         "table_sequence", 
         table_sequence 
        ), 
         xmlelement(
         "table_columns", 
         xmlagg(
          xmlelement(
          "column_description", 
          xmlforest(
           column_name as "column_name", 
           column_sequence as "column_sequence" 
          ) 
         ) 
         ) 
        ) 
       ) 
      ), VERSION '1.0', STANDALONE YES) 
from (
    select atc.*, 
    dense_rank() over (order by table_name) as table_sequence, 
    dense_rank() over (partition by table_name order by column_name) as column_sequence 
    from all_tab_columns atc 
    where owner='SYS' 
    and table_name in ('ALL_APPLY_ENQUEUE','ALL_APPLY_EXECUTE','ALL_APPLY_KEY_COLUMNS') 
) 
where owner='SYS' 
and table_name in ('ALL_APPLY_ENQUEUE','ALL_APPLY_EXECUTE','ALL_APPLY_KEY_COLUMNS') 
group by table_name, table_sequence; 

を取得する：たぶん、あなたはより多くのような何かをしたい

<?xml version="1.0" standalone="yes"?> 
<table_description> 
    <table_name>ALL_APPLY_ENQUEUE</table_name> 
    <table_sequence>1</table_sequence> 
    <table_columns> 
    <column_description> 
     <column_name>DESTINATION_QUEUE_NAME</column_name> 
     <column_sequence>1</column_sequence> 
    </column_description> 
    <column_description> 
     <column_name>RULE_OWNER</column_name> 
     <column_sequence>3</column_sequence> 
    </column_description> 
    <column_description> 
     <column_name>RULE_NAME</column_name> 
     <column_sequence>2</column_sequence> 
    </column_description> 
    </table_columns> 
</table_description> 
<table_description> 
    <table_name>ALL_APPLY_EXECUTE</table_name> 
    <table_sequence>2</table_sequence> 
    <table_columns> 
    <column_description> 
     <column_name>EXECUTE_EVENT</column_name> 
     <column_sequence>1</column_sequence> 
    </column_description> 
    <column_description> 
     <column_name>RULE_OWNER</column_name> 
     <column_sequence>3</column_sequence> 
    </column_description> 
    <column_description> 
     <column_name>RULE_NAME</column_name> 
     <column_sequence>2</column_sequence> 
    </column_description> 
    </table_columns> 
</table_description> 
<table_description> 
    <table_name>ALL_APPLY_KEY_COLUMNS</table_name> 
    <table_sequence>3</table_sequence> 
    <table_columns> 
    <column_description> 
     <column_name>APPLY_DATABASE_LINK</column_name> 
     <column_sequence>1</column_sequence> 
    </column_description> 
    <column_description> 
     <column_name>OBJECT_OWNER</column_name> 
     <column_sequence>4</column_sequence> 
    </column_description> 
    <column_description> 
     <column_name>OBJECT_NAME</column_name> 
     <column_sequence>3</column_sequence> 
    </column_description> 
    <column_description> 
     <column_name>COLUMN_NAME</column_name> 
     <column_sequence>2</column_sequence> 
    </column_description> 
    </table_columns> 
</table_description>