如何将列表值传递给 SQL Select 查询？

Question

SQL查询：

Select *
from table_name 
where ID in (123) 
  and date in (Select max(date) 
               from table_name 
               where ID in (123))

我想在上面一次传递下面提到的列表值 SQL 查询并收集列表中每个 ID 的结果套餐：cx_Oracle

我的尝试：

import cx_oracle
List= {123, 234,345,....}
List1 = []
query = " Select * from table_name where ID in (%s) 
     and date in (Select max(date) from table_name where ID in (%s))"

for j in List:
    cursor1 = db_ora.cursor()
    tb = cursor1.execute(query, params= List )
    for i in tb:
        List1.append(i)

提前谢谢你，如果你需要我这边的更多细节，请告诉我

Answer 1

据我所知，Oracle 不会接受这样的列表作为有效参数。将该值列表存储到单独的 table 中并将其用作查询的来源，例如

and t.date in (select max(t1.date) from table_name t1
               where t1.id in (select st.id from some_table st)
              )

或者，如果可能，将该逗号分隔值字符串拆分成行，例如

and t.date in (select max(t1.date) from table_name t1
               where t1.id in (select regexp_substr(%s, '[^,]+', 1, level) 
                               from dual
                               connect by level <= regexp_count(%s, ',') + 1
                              )
              )

此外，我建议您在列名前加上 table 别名以避免可能的混淆。

Answer 2

如果你想保持它与你的原始代码相似，你可以使用字符串格式

Python 2

import cx_oracle
List= [123, 234,345,....]
List1 = []
masterQuery = " Select * from table_name where ID in (%s) 
     and date in (Select max(date) from table_name where ID in (%s))"

for j in List:
    cursor1 = db_ora.cursor()
    newQuery = masterQuery % (j, j)
    tb = cursor1.execute(newQuery)
    for i in tb:
        List1.append(i)

Python 3

import cx_oracle
List= [123, 234,345,....]
List1 = []
masterQuery = " Select * from table_name where ID in {} 
     and date in (Select max(date) from table_name where ID in {})"

for j in List:
    cursor1 = db_ora.cursor()
    newQuery = masterQuery.format(j, j)
    tb = cursor1.execute(newQuery)
    for i in tb:
        List1.append(i)

如何将列表值传递给 SQL Select 查询？

How to pass list values to SQL Select query?

python

oracle

cx-oracle

list

parameter-passing

Python 2

Python 3