[英]Python ibm_db List in the Where Clause
我正在使用 Python 读取 csv 名称文件,然后将这些名称合并到 sql 查询中。 使用 ibm_sql,我试图将列表变量放在 sql WHERE
子句中: WHERE IN (List)
我将如何 go 关于在WHERE
子句中引用列表sample
?: WHERE a.name IN (sample)
#pip install ibm-db
import ibm_db_dbi as db
conn = db.connect("DATABASE=xxx;HOSTNAME=xxx;PORT=xxx;PROTOCOL=TCPIP;UID=xxx;PWD=xxx;", "", "")
with open('file.csv', newline='') as f:
reader = csv.reader(f)
next(reader, None) #skip header
data = list(reader) #list
sample = data[:20]
#sql
cursor = conn.cursor()
sql = '''
SELECT name
FROM (
SELECT DISTINCT a.name, b.number
FROM table1 as a
JOIN table2 as b ON a.sk = b.sk
WHERE a.name IN _____________ <<<
order by b.number
)
group by name
'''
#{}.format(sample)
cursor.execute(sql)
for r in cursor.fetchall():
print(r)
考虑插入一个逗号分隔的 qmark 列表, ?
(等于您在列表中的项目数)。 然后,将您的列表作为参数传递给execute
调用:
sql = '''SELECT name
FROM (
SELECT DISTINCT a.name, b.number
FROM table1 as a
JOIN table2 as b ON a.sk = b.sk
WHERE a.name IN ({})
ORDER BY b.number
) sub
GROUP BY name
'''
qmarks = ", ".join(['?' for i in sample])
cursor.execute(sql.format(qmarks), sample)
for r in cursor.fetchall():
print(r)
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