数据库中的数据清理
问题描述：在我所使用的系统中，由于历史和各种原因，导致数据库中表里面记录的数据，是有问题的，有重复的和不完整的数据
解决方案：首先，由于这些数据的量还是挺大的，手工的清理肯定不行，然后，我就想写SQL脚本来按照约定的规则进行更新，可以利用游标来完成表中的记录的遍历，但是SQL是面向结构化的查询语言，不是面向过程的，所以虽然可以但是没有C和Python这样的面向过程的使用方便，后来，我想直接在我的项目中新建一个方法，然后通过浏览器的地址栏来调用，就可以了。
PS：虽然说Django的orm很方便，但是自己使用起来还是非常的尴尬，一些筛选条件和语法规则，我还是得在网上查找例子才知道怎么用
幸好提供了直接执行SQL语句方法，我在清理的过程中，用的就是执行原生的SQL语句。
代码如下:
def datetimestr():
return datetime.now().strftime('%Y%m%d-%H%M%S')+'>>>'
def update_dcData(req):
log_path='apps/dc/l10n_reports'
update_dcData_log=open(log_path+'updateDcdataLog.log','w+')
sql_getProjectIDs='select a.project_id from' \
' (select count(*) num,project_id from dc_data where lableName=%s group by project_id) a,' \
' (select count(*) num ,project_id from management_project_target_lang group by project_id) b' \
' where a.project_id=b.project_id and a.num!=b.num order by project_id'
sql_getAllProjectIDs='select project_id from management_project'
sql_getLanguageSections='select b.name from management_project_target_lang a,management_l10nlanguage b' \
' where a.project_id=%s and a.l10nlanguage_id=b.id and b.id!="1"'
sql_getRecords='select id, languageSection,value from dc_data where lableName =%s and project_id=%s and important="1"'
sql_addRecordByID='insert into dc_data(lableName,languageSection,type,value,project_id,task_id,' \
'important,unit,settlement,workload) ' \
'select lableName,languageSection,type,value,project_id,task_id,important,unit,settlement,workload ' \
'from dc_data where id=%s'
sql_updateLgs='update dc_data set languageSection=%s where id=%s'
sql_getLableNames='select lableName from dc_data where lableName like "%%_all" group by lableName'
update_dcData_log.write(datetimestr()+'sql_getLableNames'+'>>>'+sql_getLableNames+'\n')
update_dcData_log.write(datetimestr()+'sql_getRecords'+'>>>'+sql_getRecords+'\n')
update_dcData_log.write(datetimestr()+'sql_getProjectIDs'+'>>>'+sql_getProjectIDs+'\n')
update_dcData_log.write(datetimestr()+'sql_getLanguageSections'+'>>>'+sql_getLanguageSections+'\n')
update_dcData_log.write(datetimestr()+'sql_addRecordByID'+'>>>'+sql_addRecordByID+'\n')
update_dcData_log.write(datetimestr()+'sql_updateLgs'+'>>>'+sql_updateLgs+'\n')
context=Context({'msg':'Success'})
resp=render_to_response("report/clean_data.html", context,
context_instance=RequestContext(req))
cursor=connection.cursor()
try:
cursor.execute(sql_getLableNames)
lableNames=cursor.fetchall()
except Exception,e:
update_dcData_log.write(datetimestr()+'execute sql_getLableNames error '+str(e)+'\n')
context=Context({'msg':'Error'})
return render_to_response("report/clean_data.html", context,
context_instance=RequestContext(req))
for lableName in lableNames:
try:
cursor.execute(sql_getProjectIDs,[lableName[0]])
projectIDs=cursor.fetchall()
except Exception,e:
update_dcData_log.write(datetimestr()+'execute sql_getProjectIDs error '+str(e)+'\n')
context=Context({'msg':'Error'})
return render_to_response("report/clean_data.html", context,
context_instance=RequestContext(req))
for pid in projectIDs:
try:
cursor.execute(sql_getRecords,[lableName[0],str(pid[0])])
records=cursor.fetchall()
cursor.execute(sql_getLanguageSections,[str(pid[0])])
languageSections=cursor.fetchall()
except Exception,e:
update_dcData_log.write(datetimestr()+'execute sql_getRecords or sql_getLanguageSections error '+str(e)+'\n')
context=Context({'msg':'Error'})
return render_to_response("report/clean_data.html", context,
context_instance=RequestContext(req))
values,lgs=[],[]
baseValue=str(records[0][2])
baseID=str(records[0][0])
for item in records:
lgs.append(str(item[1]))
values.append(str(item[2]))
if baseValue!=str(item[2]):
baseValue='false'
targetLgs=[str(item[0]) for item in languageSections]
if len(lgs)<1 or len(targetLgs)<1:
baseValue=='false'
if 'all' not in lgs:
try:
cursor.execute(sql_addRecordByID,[baseID])
cursor.execute(sql_updateLgs,['all',baseID])
transaction.commit_unless_managed()
except Exception,e:
update_dcData_log.write(datetimestr()+'execute sql_addRecordByID or sql_updateLgs error (all)'+str(e)+'\n')
context=Context({'msg':'Error'})
return render_to_response("report/clean_data.html", context,
context_instance=RequestContext(req))
update_dcData_log.write(datetimestr()+"all record is add into dc_data,the lableName and projectID were "+str(lableName[0])+'-'+str(pid[0])+'\n')
if baseValue=='false':
update_dcData_log.write(datetimestr()+"please update this record mutually,the lableName and projectID were "+str(lableName[0])+'-'+str(pid[0])+'\n')
else:
if len(lgs)>len(targetLgs):
update_dcData_log.write(datetimestr()+"the lableName languageSection length is longer than target numbers lableName and projectID were "+str(lableName[0])+'-'+str(pid[0])+'\n')
else:
for lg in targetLgs:
if lg not in lgs:
try:
cursor.execute(sql_addRecordByID,[baseID])
cursor.execute(sql_updateLgs,[lg,baseID])
transaction.commit_unless_managed()
except Exception,e:
update_dcData_log.write(datetimestr()+'execute sql_addRecordByID or sql_updateLgs error (lg)'+str(e)+'\n')
context=Context({'msg':'Error'})
return render_to_response("report/clean_data.html", context,
context_instance=RequestContext(req))
update_dcData_log.write(datetimestr()+lg+" record is add into dc_data,the lableName and projectID were "+str(lableName[0])+'-'+str(pid[0])+'\n')
update_dcData_log.close()
return resp
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