使用變量查詢

Question

我想用變量執行查詢

我試過這樣做但是沒用

def requeteDB(sql_request):
    with connection.cursor() as cursor:
        cursor.execute(sql_request)
        row = cursor.fetchall()
    return row

def queryWithVar():
    var = 'something with spaces'
    return('''
           Select col1
           From table1
           Where col2 = %s
           ''', [var])

queryWithVar()

('\n Select col1\n From table1\n Where col2 = %s\n ', ['something'])

requeteDB(queryWithVar())

類型錯誤：參數 1 必須是字符串或 unicode 對象：取而代之的是元組

Answer 1

問題是你的函數返回元組，所以你需要在提供它的結果給execute方法時解壓它，只需使用*語法：

def requeteDB(sql_request):
    with connection.cursor() as cursor:
        cursor.execute(*queryWithVar())
        row = cursor.fetchall()
    return row