如何在python中修剪sql查询的输出？

Question

我正在运行 sql 查询，从中生成输出并保存到 csv 文件中。

我想修剪 sql 查询的输出。

SQL 查询：

"select trim(CONCAT_WS('|','Master Job Name','Seq','TableName','Source File Name Lnd','landingdfname','TargetPath','query1','Execution Sequence')) FROM DUAL"

代码：

with db.cursor() as cur:
    query_meta = ("select trim(CONCAT_WS('|','Master Job Name','Seq','TableName','Source File Name Lnd','landingdfname','TargetPath','query1','Execution Sequence')) FROM DUAL")
    res = cur.execute(query_meta)
    res = cur.fetchall()

获取输出：

[{u"trim(CONCAT_WS('|','Master Job Name','Seq','TableName','Source File Name Lnd','landingdfname','TargetPath','query1','Execution Sequence'))": 'Master Job Name|Seq|TableName|Source File Name Lnd|landingdfname|TargetPath|query1|Execution Sequence'}]

期望的输出：

Master Job Name|Seq|TableName|Source File Name Lnd|landingdfname|TargetPath|query1|Execution Sequence

Answer 1

您可以通过在 select 语句中添加 as 来稍微清理一下结果。

select trim(
  CONCAT_WS(
    '|', 'Master Job Name', 'Seq', 'TableName', 'Source File Name Lnd',
    'landingdfname', 'TargetPath', 'query1', 'Execution Sequence'
  )
) as data FROM DUAL

如果您使用fetchall()，您的结果将始终是一个列表。我假设这个查询可能有多个结果。

# Your code
with db.cursor() as cur:
    query_meta = ("select trim(CONCAT_WS('|','Master Job Name','Seq','TableName','Source File Name Lnd','landingdfname','TargetPath','query1','Execution Sequence')) FROM DUAL")
    res = cur.execute(query_meta)
    res = cur.fetchall()

# Answer
with db.cursor() as cur:
    query_meta = (
        "select trim(CONCAT_WS("
        "'|','Master Job Name','Seq','TableName','Source File Name Lnd',"
        "'landingdfname','TargetPath','query1','Execution Sequence'"
        ")) as data FROM DUAL")
    res = cur.execute(query_meta)
    res = cur.fetchall()

results = [r["data"] for r in res]

for r in results:
    print(r)