[英]How to pass list values to SQL Select query?
SQL查询:
Select *
from table_name
where ID in (123)
and date in (Select max(date)
from table_name
where ID in (123))
我想在上面的SQL查询中一次传递下面提到的列表值,并为列表包中的每个ID收集结果: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)
预先谢谢您,如果您需要我的更多信息,请告诉我
据我所知,Oracle不会接受此类列表作为有效参数。 将该值列表存储到单独的表中,然后将其用作查询的源,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,如果可能的话,将该逗号分隔值的字符串拆分为若干行,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
)
)
另外,我建议您在列名之前使用表别名,以免造成混淆。
如果要使其与原始代码相似,则可以使用字符串格式
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)
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)
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