使用Django清理数据库中的数据

数据库，数据清洗

问题叙述性说明：在系统我用在，因为历史和由于各种原因，原因记录的数据内的数据库表，有一个问题，有反复和不完整的数据

解：首先。由于数据量还是挺大的，工的清理肯定不行，

然后，我就想写SQL脚本来依照约定的规则进行更新，能够利用游标

来完毕表中的记录的遍历，可是SQL是面向结构化的查询语言，不是面向过程的。所以尽管能够可是没有C和python这种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。就能够了。

PS：尽管说Django的orm非常方便，可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样例才知道怎么用

幸好提供了直接运行SQL语句方法，我在清理的过程中。用的就是运行原生的SQL语句。

代码例如以下:

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