Question

有没有办法在Python中使用列名而不是列索引来检索SQL结果列值？我正在使用Python 3和mySQL。我正在寻找的语法非常类似于Java构造：

Object id = rs.get("CUSTOMER_ID");

我有一个包含大量列的表，并且为我需要访问的每个列不断计算索引真的很痛苦。此外，索引使我的代码难以阅读。

谢谢！

Answer 1

MySQLdb模块有DictCursor：

像这样使用（取自Writing MySQL Scripts with Python DB-API）：

cursor = conn.cursor(MySQLdb.cursors.DictCursor)
cursor.execute("SELECT name, category FROM animal")
result_set = cursor.fetchall()
for row in result_set:
    print "%s, %s" % (row["name"], row["category"])

修改：根据user1305650，这也适用于pymysql。

Answer 2

这篇文章很老，但可能会通过搜索来发布。

现在您可以使用mysql.connector来检索字典，如下所示： https://dev.mysql.com/doc/connector-python/en/connector-python-api-mysqlcursordict.html

以下是mysql站点上的示例：

"labels_length"

Answer 3

导入pymysql

# Open database connection
db = pymysql.connect("localhost","root","","gkdemo1")

# prepare a cursor object using cursor() method
cursor = db.cursor()

# execute SQL query using execute() method.
cursor.execute("SELECT * from user")

# Get the fields name (only once!)
field_name = [field[0] for field in cursor.description]

# Fetch a single row using fetchone() method.
values = cursor.fetchone()

# create the row dictionary to be able to call row['login']
**row = dict(zip(field_name, values))**

# print the dictionary
print(row)

# print specific field
print(**row['login']**)

# print all field
for key in row:
    print(**key," = ",row[key]**)

# close database connection
db.close()

Answer 4

python 2.7

import pymysql

conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='password', db='sakila')

cur = conn.cursor()

n = cur.execute('select * from actor')
c = cur.fetchall()

for i in c:
    print i[1]

Answer 5

当然有。在Python 2.7.2 + ...

中

import MySQLdb as mdb
con =  mdb.connect('localhost', 'user', 'password', 'db');
cur = con.cursor()
cur.execute('SELECT Foo, Bar FROM Table')
for i in range(int(cur.numrows)):
    foo, bar = cur.fetchone()
    print 'foo = %s' % foo
    print 'bar = %s' % bar

Answer 6

您没有提供很多细节，但您可以尝试这样的事情：

# conn is an ODBC connection to the DB
dbCursor = conn.cursor()
sql = ('select field1, field2 from table') 
dbCursor = conn.cursor()
dbCursor.execute(sql)
for row in dbCursor:
    # Now you should be able to access the fields as properties of "row"
    myVar1 = row.field1
    myVar2 = row.field2
conn.close()

Answer 7

从特定列中选择值：

import pymysql
db = pymysql.connect("localhost","root","root","school")
cursor=db.cursor()
sql="""select Total from student"""
l=[]
try:
    #query execution
    cursor.execute(sql)
    #fetch all rows 
    rs = cursor.fetchall()
    #iterate through rows
    for i in rs:
        #converting set to list
        k=list(i)
        #taking the first element from the list and append it to the list
        l.append(k[0])
    db.commit()
except:
    db.rollback()
db.close()
print(l)

Answer 8

import mysql
import mysql.connector

db = mysql.connector.connect(
   host = "localhost",
    user = "root",
    passwd = "P@ssword1",
    database = "appbase"
)

cursor = db.cursor(dictionary=True)

sql = "select Id, Email from appuser limit 0,1"
cursor.execute(sql)
result = cursor.fetchone()

print(result)
# output =>  {'Id': 1, 'Email': 'me@gmail.com'}

print(result["Id"])
# output => 1

print(result["Email"])
# output => me@gmail.com

Answer 9

import mysql.connector as mysql
...
cursor = mysql.cnx.cursor()
cursor.execute('select max(id) max_id from ids')
(id) = [ id for id in cursor ]

Answer 10

您必须寻找一种叫做“光标中的字典”的东西

我正在使用mysql连接器，因此我必须将此参数添加到光标中，因此我可以使用列名而不是索引的

db = mysql.connector.connect(
    host=db_info['mysql_host'],
    user=db_info['mysql_user'],
    passwd=db_info['mysql_password'],
    database=db_info['mysql_db'])

cur = db.cursor()

cur = db.cursor( buffered=True , dictionary=True)

如何使用Python中的列名检索SQL结果列值？

10 个答案: