Python调用SQLPlus来操作和解析Oracle数据库的方法

import os
import sys
from subprocess import Popen, PIPE
 
sql = """
set linesize 400
col owner for a10
col object_name for a30
 
select owner, object_name
 from dba_objects
 where rownum<=10;
"""
 
proc = Popen(["sqlplus", "-S", "/", "as", "sysdba"], stdout=PIPE, stdin=PIPE, stderr=PIPE)
proc.stdin.write(sql)
(out, err) = proc.communicate()
 
if proc.returncode != 0:
  print err
  sys.exit(proc.returncode)
else:
  print out

（这是空行）
Number    Name    Address
------------ ----------- ------------------
1001     张三     南京路
1002     李四     上海路

set linesize 32767
set pagesize 9999
set term off verify off feedback off tab off
set numwidth 40

#!/usr/bin/python
#coding=UTF-8

'''
@author: 双子座@开源中国
@summary: 通过SqlPlus查询Oracles数据库
'''

import os;

os.environ['NLS_LANG'] = 'AMERICAN_AMERICA.AL32UTF8'
gStrConnection = 'username/password@10.123.5.123:1521/ora11g'

#解析SqlPlus的查询结果，返回列表
def parseQueryResult(listQueryResult):
  listResult = []
  #如果少于4行，说明查询结果为空
  if len(listQueryResult) < 4:
    return listResult
  #第0行是空行，第1行可以获取字段名称，第2行可获取SQLPlus原始结果中每列宽度，第3行开始是真正输出
  # 1 解析第2行，取得每列宽度，放在列表中
  listStrTmp = listQueryResult[2].split(' ')
  listIntWidth = []
  for oneStr in listStrTmp:
    listIntWidth.append(len(oneStr))
  # 2 解析第1行，取得字段名称放在列表中
  listStrFieldName = []
  iLastIndex = 0
  lineFieldNames = listQueryResult[1]
  for iWidth in listIntWidth:
    #截取[iLastIndex, iLastIndex+iWidth)之间的字符串
    strFieldName = lineFieldNames[iLastIndex:iLastIndex + iWidth]
    strFieldName = strFieldName.strip() #去除两端空白符
    listStrFieldName.append(strFieldName)
    iLastIndex = iLastIndex + iWidth + 1
  # 3 第3行开始，解析结果，并建立映射，存储到列表中
  for i in range(3, len(listQueryResult)):
    oneLiseResult = unicode(listQueryResult[i], 'UTF-8')
    fieldMap = {}
    iLastIndex = 0
    for j in range(len(listIntWidth)):
      strFieldValue = oneLiseResult[iLastIndex:iLastIndex + listIntWidth[j]]
      strFieldValue = strFieldValue.strip()
      fieldMap[listStrFieldName[j]] = strFieldValue
      iLastIndex = iLastIndex + listIntWidth[j] + 1
    listResult.append(fieldMap)
  return listResult

def QueryBySqlPlus(sqlCommand):
  global gStrConnection
  #构造查询命令
  strCommand = 'sqlplus -S %s <<!\n' % gStrConnection
  strCommand = strCommand + 'set linesize 32767\n'
  strCommand = strCommand + 'set pagesize 9999\n'
  strCommand = strCommand + 'set term off verify off feedback off tab off \n'
  strCommand = strCommand + 'set numwidth 40\n'
  strCommand = strCommand + sqlCommand + '\n'
  #调用系统命令收集结果
  result = os.popen(strCommand)
  list = []
  for line in result:
    list.append(line)
  return parseQueryResult(list)

select userenv['language'] from dual;

listResult = QueryBySqlPlus('select * from studentinfo')