Question

所以我正在尝试使用cursor.execute运行一个sql命令

cid = data[key]['customerid']
name = data[key]['name']
bdate = data[key]['birthdate']
ffon = data[key]['frequentflieron']

curs.execute("INSERT INTO customers (c,n,b,f) VALUES (%s,%s,%s,%s)) WHERE NOT EXISTS (Select 1 FROM customers WHERE customerid = (c) VALUES (%s));",(cid,name,bdate,ffon,cid))

尝试

curs.execute("""INSERT INTO customers (c,n,b,f) 
            VALUES (%s,%s,%s,%s) WHERE NOT EXISTS (
                Select 1 
                FROM customers 
                where customerid = %s);""",(cid,name,bdate,ffon,cid)

我现在收到此错误

   Traceback (most recent call last):
File "psy.py", line 44, in <module>
  custinfo(data,key)
File "psy.py", line 28, in custinfo
  where customerid = %s);""",(cid,name,bdate,ffon,cid))
psycopg2.ProgrammingError: syntax error at or near "WHERE"
LINE 2: ...ust1000','XYZ','1991-12-06','Southwest Airlines') WHERE NOT ...

如何使用where子句进行插入？

Answer 1

在占位符和子查询需要一些修饰之后，你有一个额外的近似括号。请尝试改为：

curs.execute("""INSERT INTO customers (c,n,b,f) 
                VALUES (%s,%s,%s,%s) WHERE NOT EXISTS (
                    Select 1 
                    FROM customers 
                    where customerid = %s);""",(cid,name,bdate,ffon,cid))

嗯，也许这种语法是非法的。试试这个：

curs.execute("""INSERT INTO customers (c,n,b,f) 
                VALUES (%s,%s,%s,%s) 
                ON CONFLICT (customerid) DO NOTHING);""",(cid,name,bdate,ffon,cid))

Cursor.execute用

1 个答案: