Postgresql 从xml插入多条记录

我希望大容量插入到PostgreSQL数据库中：后端代码将创建类似XML的XML

<items>
   <i dt="2014-08-01" name="vvv" count="12" />
   <i dt="2014-08-02" name="zzz" count="6" />
</items>

现在，最后我希望temp_值有3条记录，就像在XML中一样，但是表是空的

如果注释掉insert into行，您将看到值被正确解析。它只是返回一条记录，其中每列都是一个数组，而不是返回多条记录

我遗漏了什么？

很显然，数组索引是解决方案：

unnestarray |将数组展开为一组行

所以代码应该是

CREATE TEMP TABLE temp_values (dt date, name varchar, count int) ON COMMIT DROP;

WITH x AS (SELECT '
  <items>
    <i dt="2014-08-01" name="vvv" count="12" />
    <i dt="2014-08-02" name="zzz" count="6" />
    <i dt="2014-08-03" name="bbd" count="10" />
  </items>'::xml AS t
)
INSERT INTO temp_values
SELECT 
  CAST(CAST((xpath('//@dt', node))[1] as varchar) as date),
  CAST((xpath('//@name', node))[1] as varchar),
  CAST(CAST((xpath('//@count', node))[1] as varchar) as int)
FROM (SELECT unnest(xpath('/items/i', t)) AS node FROM x) sub;

SELECT * FROM temp_values

---

我希望在@之前删除一些额外的斜杠：

CREATE TEMP TABLE temp_values (dt date, name varchar, count int) ON COMMIT DROP;

WITH x AS (SELECT '
  <items>
    <i dt="2014-08-01" name="vvv" count="12" />
    <i dt="2014-08-02" name="zzz" count="6" />
    <i dt="2014-08-03" name="bbd" count="10" />
  </items>'::xml AS t
)
INSERT INTO temp_values
SELECT 
  CAST(CAST((xpath('@dt', node))[1] as varchar) as date),
  CAST((xpath('@name', node))[1] as varchar),
  CAST(CAST((xpath('@count', node))[1] as varchar) as int)
FROM (SELECT unnest(xpath('/items/i', t)) AS node FROM x) sub;

SELECT * FROM temp_values

CREATE TEMP TABLE temp_values (dt date, name varchar, count int) ON COMMIT DROP;

WITH x AS (SELECT '
  <items>
    <i dt="2014-08-01" name="vvv" count="12" />
    <i dt="2014-08-02" name="zzz" count="6" />
    <i dt="2014-08-03" name="bbd" count="10" />
  </items>'::xml AS t
)
INSERT INTO temp_values
SELECT 
  CAST(CAST((xpath('@dt', node))[1] as varchar) as date),
  CAST((xpath('@name', node))[1] as varchar),
  CAST(CAST((xpath('@count', node))[1] as varchar) as int)
FROM (SELECT unnest(xpath('/items/i', t)) AS node FROM x) sub;

SELECT * FROM temp_values