Python MySQLdb execute table variable [duplicate]

问题:

This question already has an answer here:

Python sqlite3 parameterized drop table (1 answer)

Closed 2 years ago.

I'm trying to use a variable for a table name. I get the error "... near ''myTable'' at line 1 I must not be escaping this right. The double '' in the error seems to be a clue, but I don't get it.

db = MySQLdb.connect("localhost","user","pw","database" )
table = "myTable"
def geno_order(db, table):
    cursor = db.cursor() # prepare a cursor object using cursor() method
    sql = "SELECT * FROM %s"
    cursor.execute(sql, table)
    results = cursor.fetchall()

回答1:

You can't use a parameter for the table name in the execute call. You'll need to use normal Python string interpolation for that:

sql = "SELECT * FROM %s" % table
cursor.execute(sql)

Naturally, you'll need to be extra careful if the table name is coming from user input. To mitigate SQL injection, validate the table name against a list of valid names.