Python：使用mysqldb將MySQL表導入為字典？

Question

任何人都知道如何使用mysqldb將具有大量行的MySQL表轉換為Python中的字典對象列表？

我的意思是將一組MySQL行（列'a'，'b'和'c'）轉換為如下所示的Python對象：

data = [ { 'a':'A', 'b':(2, 4), 'c':3.0 }, { 'a':'Q', 'b':(1, 4), 'c':5.0 }, { 'a':'T', 'b':(2, 8), 'c':6.1 } ]

謝謝 ：）

Answer 1

MySQLdb有一個單獨的游標類，DictCursor。 您可以將要使用的游標類傳遞給MySQLdb.connect（）：

import MySQLdb.cursors
MySQLdb.connect(host='...', cursorclass=MySQLdb.cursors.DictCursor)

Answer 2

如果你需要使用更多的游標，只需要一個是MySQLdb.cursors.DictCursor，你可以這樣做：

import MySQLdb
db = MySQLdb.connect(host='...', db='...', user='...t', passwd='...')

list_cursor = db.cursor()
dict_cursor = db.cursor(MySQLdb.cursors.DictCursor)

Answer 3

我認為使用mysql.connector將select轉換為dict比MySQLdb更容易，並且支持更多的Python版本：

cursor = conn.cursor(dictionary=True)

---

詳細示例：

import mysql.connector # pip install mysql-connector-python

mydb = mysql.connector.connect(host="localhost", user="user", passwd="pass", database="dbname")
cursor = conn.cursor(dictionary=True)
sql = "SELECT * FROM `table` WHERE 1"
mycursor.execute(sql)
rows = mycursor.fetchall()
for row in rows:
    row["col"]

Answer 4

這是一個古老的帖子，雖然這個答案並不完全是OP所尋求的，但它的內容大致相同。 它不是生成字典列表，而是生成列表字典：

還以為我會提供生成字典的完整代碼：

import MySQLdb
import MySQLdb.cursors

dict_serv = MySQLdb.connect(host = 'localhost', user = 'root', passwd = 'mypassword', cursorclass = MySQLdb.cursors.DictCursor)

with dict_serv as c:
    c.execute("USE mydb")
    c.execute("SELECT col1, col2 FROM mytable WHERE id = 'X123'")

    # Save the dictionary to a separate variable
    init_dict = c.fetchall()

    # This line builds the column headers
    sql_cols = [ col[0] for col in c.description ]

    # This is a list comprehension within a dictionary comprehension
    # which builds the full dictionary in a single line.  
    sql_dict = { k : [ d[k] for d in init_dict ] for k in sql_cols }

產量：

{ 'col1': ['apple','banana'], 'col2':['red','yellow'] }

Answer 5

使用PYTHON> = 3.6; 這是通過這樣做：

OBS：這里我使用的是2種數據庫類型ORACLE 12g和MYSQL 5.6; 並且主服務器是ORACLE，mysql僅由軟件的某些部分使用...然后...我的連接類的代碼：

這里是來自shellcript代碼...然后我帶一個字符串來顯示這里...

myp3 ='XXXXXXXXXXXXXXXXXXXXXXXXXX PASSWD MYSQL XXXXXXXXXXXXXXXXXXXXXXXXXXX'

import cx_Oracle
import MySQLdb
import MySQLdb.cursors

class oracle(object):
    def __init__(self, serverORACLE=3, MYSQL='N', serverMYSQL=3):
        ## ORACLE connection!
        try:

        if serverORACLE == 1:
            self.db = cx_Oracle.connect('sys/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521/DATABASE_X')
            print('ORACLE [ system/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521 ] ===> CONNECTED')

        if serverORACLE == 2:
            self.db = cx_Oracle.connect('system/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521/DATABASE_X')
            print('ORACLE [ system/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521 ] ===> CONNECTED')

        if serverORACLE == 3:
            self.db = cx_Oracle.connect('userLEVEL1/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521/DATABASE_X')
            print('ORACLE [ userLEVEL1/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521 ] ===> CONNECTED')

        if serverORACLE == 4:
            self.db = cx_Oracle.connect('userLEVEL2/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521/DATABASE_X')
            print('ORACLE [ userLEVEL2/[xxxxPASSWORDxxxxx]@[xxxxxIP/HOSTxxxxxx]:1521 ] ===> CONNECTED')

        self.cursor = self.db.cursor()

    except Exception as e:
        count = 0
        S1 = ''
        for W in str(e):
            S1+=W
            count+=1 
            if count >= 40:
                S1+=' \n'
                count = 0
        print('\n\n ORACLE DATABASE ===> CONECTION FAILED!', 
                    '\n error - module: ', S1)

    ##conexao MYSQL
    if MYSQL=='S': 
        try:
            if serverMYSQL == 1:
                self.dbMySQL = MySQLdb.connect(user='root', host='XXXXXX HOST XXXXX', use_unicode=True, cursorclass=MySQLdb.cursors.DictCursor,
                                                charset='utf8', port=3306, passwd=myp3, db='XXXX')
                print('MySQL [ root / XXXXXX HOST XXXXX:3306 ] ===> CONNECTED')

            if serverMYSQL == 2:
                self.dbMySQL = MySQLdb.connect(user='XXXX USER XXXXX', host='XXXXXX HOST XXXXX', use_unicode=True, cursorclass=MySQLdb.cursors.DictCursor,
                                                charset='utf8', port=3306, passwd=myp3, db='XXXX')
                print('MySQL [ XXXX USER XXXXX / XXXXXX HOST XXXXX:3306 ] ===> CONNECTED')

            self.cursorMYSQL = self.dbMySQL.cursor()

        except Exception as e:
            count = 0
            S1 = ''
            for W in str(e):
                S1+=W
                count+=1 
                if count >= 40:
                    S1+=' \n'
                    count = 0
            print('\n\n MYSQL DATABASE ===> CONECTION FAILED!', 
                    '\n error - module: ', S1)

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