带有 where 子句和单引号的 cx_oracle select 语句

Question

import cx_Oracle

dsn_tns = cx_Oracle.makedsn('**********', '*******', service_name='***') 

conn = cx_Oracle.connect(user='******', password='*******', dsn=dsn_tns)

c = conn.cursor()
c.execute('select username,created from dba_users where username='USERNAME' ')
for row in c:
    print (row[0], '-', row[1]) # this only shows the first two columns. To add an additional column you'll need to add , '-', row[2], etc.
conn.close()

  File "*******************", line 9
    c.execute('select username,created from dba_users where username='MONITOR' ')
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: invalid syntax. Perhaps you forgot a comma?

这里出了什么问题，当我在用户名周围使用单引号时，我收到了这个错误。

Answer 1

c.execute("""select username,created from dba_users where username=:USERNAME""", USERNAME = 'Cristiano Ronaldo')

Answer 2

您的 SQL 语句的语法确实不正确。 目前尚不清楚 USERNAME 的值应该是什么。 如果它只是应该是连接的用户，你可以这样做：

c.execute("select username, created from dba_users where username = user")

如果您打算将其作为参数，则可以执行以下操作：

c.execute("select username, created from dba_users where username = :user",
          user=USERNAME)