本文例項講述了Python實現將MySQL資料庫表中的資料匯出生成csv格式檔案的方法。分享給大家供大家參考，具體如下：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
"""
 Purpose: 生成日彙總對賬檔案
 Created: 2015/4/27
 Modified:2015/5/1
 @author: guoyJoe
"""
#匯入模組
import MySQLdb
import time
import datetime
import os
#日期
today = datetime.date.today()
yestoday = today - datetime.timedelta(days=1)
#對賬日期
checkAcc_date = yestoday.strftime('%Y%m%d')
#對賬檔案目錄
fileDir = "/u02/filesvrd/report"
#SQL語句
sqlStr1 = 'SELECT distinct pay_custid FROM dbpay.tb_pay_bill WHERE date_acct = %s'
#總筆數|成功交易筆數|成功交易金額|退貨筆數|退貨金額|撤銷筆數|撤銷金額
sqlStr2="""SELECT totalNum,succeedNum,succeedAmt,returnNum,returnAmt,revokeNum,revokeAmt
  FROM
    (SELECT count(order_id) AS totalNum
      FROM (SELECT p.order_id as order_id
        FROM dbpay.tb_pay_bill p,dbpay.tb_paybillserial q
        WHERE p.oid_billno = q.oid_billno
        AND p.paycust_accttype = 2
        AND p.Paycust_Type = 1
        AND p.stat_bill in (0,4)
        AND q.pay_stat = 1
        AND q.col_stat = 1
        AND p.pay_custid = %s
        AND q.date_acct = %s
        UNION ALL
        SELECT p.order_id as order_id
        FROM dbpay.tb_pay_bill p,dbpay.tb_paybillserial q
        WHERE p.oid_billno = q.oid_billno
        AND p.col_accttype = 2
        AND p.col_type = 1
        AND p.stat_bill in (0,4)
        AND q.pay_stat = 1
        AND q.col_stat = 1
        AND p.col_custid = %s
        AND q.date_acct = %s
        UNION ALL
        SELECT R.ORDER_ID AS ORDER_ID
        FROM DBPAY.TB_REFUND_BILL R,DBPAY.TB_PAYBILLSERIAL Q
        WHERE R.oid_refundno = Q.OID_BILLNO
         AND R.ORI_COL_ACCTTYPE = 2
         AND R.ORI_COL_TYPE = 1
         AND R.STAT_BILL = 2
         AND Q.PAY_STAT = 1
         AND Q.COL_STAT = 1
         AND R.ORI_COL_CUSTID = %s
         AND Q.DATE_ACCT = %s ) as total) A,(SELECT count(order_id) succeedNum,sum(amt_paybill) succeedAmt
         FROM (SELECT p.order_id as order_id,q.amt_payserial/1000 as amt_paybill
        FROM dbpay.tb_pay_bill p,dbpay.tb_paybillserial q
        WHERE p.oid_billno = q.oid_billno
        AND p.paycust_accttype = 2
        AND p.Paycust_Type = 1
        AND p.stat_bill = '0'
        AND q.pay_stat = 1
        AND q.col_stat = 1
        AND p.pay_custid = %s
        AND q.date_acct = %s
        UNION ALL
        SELECT p.order_id as order_id,dbpay.tb_paybillserial q
        WHERE p.oid_billno = q.oid_billno
        AND p.col_accttype = 2
        AND p.col_type = 1
        AND p.stat_bill = '0'
        AND q.pay_stat = 1
        AND q.col_stat = 1
        AND p.col_custid = %s
        AND q.date_acct = %s ) as succeed) B,(SELECT count(order_id) returnNum,sum(amt_paybill) returnAmt
        FROM (SELECT R.ORDER_ID AS ORDER_ID,Q.AMT_PAYSERIAL/1000 AS AMT_PAYBILL
        FROM DBPAY.TB_REFUND_BILL R,DBPAY.TB_PAYBILLSERIAL Q
        WHERE R.oid_refundno = Q.OID_BILLNO
         AND R.ORI_COL_ACCTTYPE = 2
         AND R.ORI_COL_TYPE = 1
         AND R.STAT_BILL = 2
         AND Q.PAY_STAT = 1
         AND Q.COL_STAT = 1
         AND R.ORI_COL_CUSTID = %s
         AND Q.DATE_ACCT = %s ) as retur) C,(SELECT count(order_id) revokeNum,sum(amt_paybill) revokeAmt
         FROM (SELECT p.order_id as order_id,q.amt_payserial/1000 as amt_paybill
         FROM dbpay.tb_pay_bill p,dbpay.tb_paybillserial q
        WHERE p.oid_billno = q.oid_billno
        AND p.paycust_accttype = 2
        AND p.Paycust_Type = 1
        AND p.stat_bill = '4'
        AND q.pay_stat = 1
        AND q.col_stat = 1
        AND p.pay_custid = %s
        AND q.date_acct = %s
        UNION ALL
        SELECT p.order_id as order_id,dbpay.tb_paybillserial q
        WHERE p.oid_billno = q.oid_billno
        AND p.col_accttype = 2
        AND p.col_type = 1
        AND p.stat_bill = '4'
        AND q.pay_stat = 1
        AND q.col_stat = 1
        AND p.col_custid = %s
        AND q.date_acct = %s) as revok) D"""
try:
#連線MySQL資料庫
  connDB= MySQLdb.connect("192.168.1.6","root","test" )
  connDB.select_db('test')
  curSql1 = connDB.cursor()
#查詢商戶
  curSql1.execute(sqlStr1,checkAcc_date)
  payCustID = curSql1.fetchall()
  if len(payCustID) < 1:
    print ('No found checkbill data,Please check the data for %s!' %checkAcc_date)
    exit(1)
  for row in payCustID:
      custid = row[0]
#建立彙總日賬單檔名稱
      fileName = '%s/JYMXSUM_%s_%s.csv' %(fileDir,custid,checkAcc_date)
#判斷檔案是否存在,如果存在則刪除檔案,否則生成檔案！
      if os.path.exists(fileName):
        os.remove(fileName)
      print 'The file start generating! %s' %time.strftime('%Y-%m-%d %H:%M:%S')
      print '%s' %fileName
#開啟遊標
      curSql2= connDB.cursor()
#執行SQL
      checkAcc_date = yestoday.strftime('%Y%m%d')
      curSql2.execute(sqlStr2,(custid,checkAcc_date,c
ustid,checkAcc_date))
#獲取資料
      datesumpay = curSql2.fetchall()
#開啟檔案
      outfile = open(fileName,'w')
      for sumpay in datesumpay:
        totalNum = sumpay[0]
        succeedNum = sumpay[1]
        succeedAmt= sumpay[2]
        returnNum = sumpay[3]
        returnAmt = sumpay[4]
        revokeNum = sumpay[5]
        revokeAmt = sumpay[6]
#生成彙總日賬單檔案
        outfile.write('%s|%s|%s|%s|%s|%s|%s\n' %(totalNum,revo
keAmt))
      outfile.flush()
      curSql2.close()
  curSql1.close()
  connDB.close()
  print 'The file has been generated! %s' %time.strftime('%Y-%m-%d %H:%M:%S')
except MySQLdb.Error,err_msg:
  print "MySQL error msg:",err_msg

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