Oracle Logminer使用

2024-02-01 08:48
文章标签 oracle 使用 logminer

本文主要是介绍Oracle Logminer使用,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!

--创建测试数据

C:\>set NLS_LANG=SIMPLIFIED CHINESE_CHINA.ZHS16GBK

C:\>sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on 星期三 3月 12 22:10:38 2014

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.


连接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options


SQL> create tablespace zwc datafile 'C:\oracle\zwc01.dbf' size 500m;


表空间已创建。


SQL> create user zwc identified by zwc;


用户已创建。


SQL> grant resource,connect to zwc;


授权成功。


SQL> conn zwc
输入口令:
已连接。
SQL> create table zwc.tab01(a int primary key,b varchar2(100),c varchar2(100),d date default sysdate) tablespace zwc;


表已创建。


SQL> create or replace procedure p_inst_tab01 as
  2  begin
  3      for i in 1..2000000 loop
  4          insert into tab01(a,b,c,d) values(i,i,i,sysdate);
  5          if mod(i,2000)=0 then
  6              commit;
  7          end if;
  8      end loop;
  9  end p_inst_tab01;
 10  /


过程已创建。


SQL> show user
USER 为 "ZWC"
SQL> exec p_inst_tab01;


PL/SQL 过程已成功完成。


SQL> select count(*) from tab01;


  COUNT(*)
----------
   2000000
   
SQL> select sum(bytes)/1024/1024 "size MB" from user_segments where segment_name='TAB01';


   size MB
----------
        80



--删除、更新数据

SQL> show user
USER 为 "SYS"
SQL> alter database add supplemental log data;


数据库已更改。


SQL> delete from zwc.tab01 where rownum<=100;


已删除100行。


SQL> update zwc.tab01 set d=sysdate-100 where rownum<=10;


已更新10行。


SQL> commit;


提交完成。




--使用logminer找回数据

SQL> alter system set utl_file_dir='c:\oracle' scope=spfile;


系统已更改。


SQL> alter session set nls_date_format ='yyyy-mm-dd hh24:mi:ss';


会话已更改。


SQL> shutdown immediate
数据库已经关闭。
已经卸载数据库。
ORACLE 例程已经关闭。
SQL> startup
ORACLE 例程已经启动。


Total System Global Area  612368384 bytes
Fixed Size                  2067656 bytes
Variable Size             167772984 bytes
Database Buffers          436207616 bytes
Redo Buffers                6320128 bytes
数据库装载完毕。
数据库已经打开。
SQL> execute dbms_logmnr_d.build(dictionary_filename=>'test.ora',dictionary_location=>'c:\oracle');


PL/SQL 过程已成功完成。


--select group#,status from v$log;


--select group#,member from v$logfile;


SQL> execute dbms_logmnr.add_logfile(logfilename=>'C:\arch\ARC00041_0842045960.001',options=>dbms_logmnr.new);


PL/SQL 过程已成功完成。


SQL> execute dbms_logmnr.start_logmnr(dictFilename=>'c:\oracle\test.ora');


PL/SQL 过程已成功完成。


SQL> create table zwc.t_logminer tablespace zwc as select * from v_$logmnr_contents;


表已创建。


SQL> select count(*) from zwc.t_logminer;


  COUNT(*)
----------
       212


SQL> execute dbms_logmnr.end_logmnr;


PL/SQL 过程已成功完成。


SQL> select count(*) from zwc.t_logminer where seg_name='TAB01' and seg_owner='ZWC';


  COUNT(*)
----------
       110




--需要恢复数据查询SQL_UNDO,执行误删除的是SQL_REDO,OPERATION是操作类型

[oracle@db10 ~]$ sqlplus zwc/zwc@192.168.1.10:1521/prod


SQL*Plus: Release 10.2.0.5.0 - Production on Wed Mar 12 23:10:15 2014


Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options


SQL> set lines 150 pages 200


SQL> select SQL_UNDO from t_logminer where seg_name='TAB01' and seg_owner='ZWC' and OPERATION='DELETE';


SQL_UNDO
------------------------------------------------------------------------------------------------------------------------------------------------------
insert into "ZWC"."TAB01"("A","B","C","D") values ('201','201','201',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('202','202','202',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('203','203','203',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('204','204','204',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('205','205','205',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('206','206','206',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('207','207','207',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('208','208','208',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('209','209','209',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('210','210','210',TO_DATE('02-12月-13', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('211','211','211',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('212','212','212',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('213','213','213',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('214','214','214',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('215','215','215',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('216','216','216',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('217','217','217',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('218','218','218',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('219','219','219',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('220','220','220',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('221','221','221',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('222','222','222',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('223','223','223',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('224','224','224',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('225','225','225',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('226','226','226',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('227','227','227',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('228','228','228',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('229','229','229',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('230','230','230',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('231','231','231',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('232','232','232',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('233','233','233',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('234','234','234',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('235','235','235',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('236','236','236',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('237','237','237',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('238','238','238',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('239','239','239',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('240','240','240',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('241','241','241',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('242','242','242',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('243','243','243',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('244','244','244',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('245','245','245',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('246','246','246',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('247','247','247',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('248','248','248',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('249','249','249',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('250','250','250',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('251','251','251',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('252','252','252',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('253','253','253',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('254','254','254',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('255','255','255',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('256','256','256',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('257','257','257',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('258','258','258',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('259','259','259',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('260','260','260',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('261','261','261',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('262','262','262',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('263','263','263',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('264','264','264',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('265','265','265',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('266','266','266',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('267','267','267',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('268','268','268',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('269','269','269',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('270','270','270',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('271','271','271',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('272','272','272',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('273','273','273',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('274','274','274',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('275','275','275',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('276','276','276',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('277','277','277',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('278','278','278',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('279','279','279',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('280','280','280',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('281','281','281',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('282','282','282',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('283','283','283',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('284','284','284',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('285','285','285',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('286','286','286',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('287','287','287',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('288','288','288',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('289','289','289',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('290','290','290',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('291','291','291',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('292','292','292',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('293','293','293',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('294','294','294',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('295','295','295',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('296','296','296',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('297','297','297',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('298','298','298',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('299','299','299',TO_DATE('12-3月 -14', 'DD-MON-RR'));
insert into "ZWC"."TAB01"("A","B","C","D") values ('300','300','300',TO_DATE('12-3月 -14', 'DD-MON-RR'));


100 rows selected.


SQL> select SQL_UNDO from t_logminer where seg_name='TAB01' and seg_owner='ZWC' and OPERATION='UPDATE';


SQL_UNDO
------------------------------------------------------------------------------------------------------------------------------------------------------
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAAMAEs';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAAMAEt';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAAMAEu';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAANAAA';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAANAAB';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAANAAC';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAANAAD';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAANAAE';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAANAAF';
update "ZWC"."TAB01" set "D" = TO_DATE('12-3月 -14', 'DD-MON-RR') where "D" = TO_DATE('02-12月-13', 'DD-MON-RR') and ROWID = 'AAAM7rAAGAAAAANAAG';


10 rows selected.

这篇关于Oracle Logminer使用的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!



http://www.chinasem.cn/article/666726

相关文章

python使用库爬取m3u8文件的示例

《python使用库爬取m3u8文件的示例》本文主要介绍了python使用库爬取m3u8文件的示例,可以使用requests、m3u8、ffmpeg等库,实现获取、解析、下载视频片段并合并等步骤,具有... 目录一、准备工作二、获取m3u8文件内容三、解析m3u8文件四、下载视频片段五、合并视频片段六、错误

gitlab安装及邮箱配置和常用使用方式

《gitlab安装及邮箱配置和常用使用方式》:本文主要介绍gitlab安装及邮箱配置和常用使用方式,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地方,望不吝赐教... 目录1.安装GitLab2.配置GitLab邮件服务3.GitLab的账号注册邮箱验证及其分组4.gitlab分支和标签的

SpringBoot3应用中集成和使用Spring Retry的实践记录

《SpringBoot3应用中集成和使用SpringRetry的实践记录》SpringRetry为SpringBoot3提供重试机制,支持注解和编程式两种方式,可配置重试策略与监听器,适用于临时性故... 目录1. 简介2. 环境准备3. 使用方式3.1 注解方式 基础使用自定义重试策略失败恢复机制注意事项

nginx启动命令和默认配置文件的使用

《nginx启动命令和默认配置文件的使用》:本文主要介绍nginx启动命令和默认配置文件的使用,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地方,望不吝赐教... 目录常见命令nginx.conf配置文件location匹配规则图片服务器总结常见命令# 默认配置文件启动./nginx

在Windows上使用qemu安装ubuntu24.04服务器的详细指南

《在Windows上使用qemu安装ubuntu24.04服务器的详细指南》本文介绍了在Windows上使用QEMU安装Ubuntu24.04的全流程:安装QEMU、准备ISO镜像、创建虚拟磁盘、配置... 目录1. 安装QEMU环境2. 准备Ubuntu 24.04镜像3. 启动QEMU安装Ubuntu4

使用Python和OpenCV库实现实时颜色识别系统

《使用Python和OpenCV库实现实时颜色识别系统》:本文主要介绍使用Python和OpenCV库实现的实时颜色识别系统,这个系统能够通过摄像头捕捉视频流,并在视频中指定区域内识别主要颜色(红... 目录一、引言二、系统概述三、代码解析1. 导入库2. 颜色识别函数3. 主程序循环四、HSV色彩空间详解

Windows下C++使用SQLitede的操作过程

《Windows下C++使用SQLitede的操作过程》本文介绍了Windows下C++使用SQLite的安装配置、CppSQLite库封装优势、核心功能(如数据库连接、事务管理)、跨平台支持及性能优... 目录Windows下C++使用SQLite1、安装2、代码示例CppSQLite:C++轻松操作SQ

Python常用命令提示符使用方法详解

《Python常用命令提示符使用方法详解》在学习python的过程中,我们需要用到命令提示符(CMD)进行环境的配置,:本文主要介绍Python常用命令提示符使用方法的相关资料,文中通过代码介绍的... 目录一、python环境基础命令【Windows】1、检查Python是否安装2、 查看Python的安

Python并行处理实战之如何使用ProcessPoolExecutor加速计算

《Python并行处理实战之如何使用ProcessPoolExecutor加速计算》Python提供了多种并行处理的方式,其中concurrent.futures模块的ProcessPoolExecu... 目录简介完整代码示例代码解释1. 导入必要的模块2. 定义处理函数3. 主函数4. 生成数字列表5.

Python中help()和dir()函数的使用

《Python中help()和dir()函数的使用》我们经常需要查看某个对象(如模块、类、函数等)的属性和方法,Python提供了两个内置函数help()和dir(),它们可以帮助我们快速了解代... 目录1. 引言2. help() 函数2.1 作用2.2 使用方法2.3 示例(1) 查看内置函数的帮助(