Oracle根据时间将一条记录进行分割成多条(开始时间与结束时间跨几天就分割成几条)...

本文介绍如何使用Oracle游标技术,针对A表中开始时间与结束时间不在同一天的记录进行批量拆分,通过计算时间跨度并循环插入新记录至表B,实现数据的有效管理和维护。

首先对需求进行一下说明:

假如我们A表里面有一条记录是这样的:

三个字段,第一个为MDN(号码),第二个为STARTTIME(开始时间),第三个为ENDTIME(结束时间)

现需要对表中所有这种开始时间与结束时间不在同一天的记录进行拆分,时间跨度几天就拆分成几条:

以上为实现后的效果图,由于之前对Oracle的游标不太了解,请教了组长,后来也仔细看了下

游标的使用,这个实现也并不难。主要是首先计算两个时间的跨度为几天,然后通过循环,将对应

的记录插入到另一张表中去。其中tableA是原始表,tableB是新表,v_d表示时间跨度的变量,其他变量

对应表字段。

declare 
  -- Local variables here
  v_startTime date;
  v_endTime date;
  v_mdn int;
  v2_startTime date;
  v2_endTime date;
  v_d int;
  cursor cr is
         select mdn,startTime,endTime from tableA
         where trunc(endTime,'dd') - trunc(startTime,'dd') > 0;
begin
  -- Test statements here
  
         
  open cr;
  LOOP
       fetch cr into v_mdn,v_startTime,v_endTime;
       exit when cr%notfound;
       v_d :=trunc(v_endTime,'dd') - trunc(v_startTime,'dd') -1;
       dbms_output.put_line(v_d);
       
       insert into tableB values(v_mdn,trunc(v_endTime,'dd'),v_endTime);
            loop 
                exit when v_d=0;
                v2_startTime := trunc(v_startTime,'dd') + v_d;
                dbms_output.put_line(to_char(v2_startTime,'yyyy-MM-dd'));
                v2_endTime := v2_startTime + 1;
                insert into tableB values(v_mdn,v2_startTime,v2_endTime);
                v_d:=v_d-1;
                
            end loop;
       insert into tableB values(v_mdn,v_startTime,trunc(v_startTime,'dd')+1);
      
  end loop;
  
  close cr;
  
end;
/


### Initialization File in Software Development Context In the realm of software development, an initialization file (often referred to as a config or ini file) plays a crucial role during system startup and operation. These files contain settings that dictate how applications behave upon launch and throughout their lifecycle. #### Purpose Initialization files serve multiple purposes: - **Configuration Storage**: Store user-defined parameters such as paths, ports, IDs, etc., ensuring flexibility without requiring code changes. - **Environment Adaptation**: Allow systems like ZooKeeper servers to adapt based on deployment environments through configurable options[^3]. - **Bootstrapping Information**: Provide essential instructions for initial program execution phases, including setting up necessary resources before main application logic begins executing. For example, BL1 handles critical early-stage operations post-boot by reading specific configurations from these files[^1]. #### Usage The utilization of initialization files varies across different platforms but generally involves defining key-value pairs within sections denoted by headers enclosed between square brackets `[SectionName]`. Here’s a simple demonstration using Python's configparser module to read/write INI-style configuration data: ```python import configparser config = configparser.ConfigParser() config.read('example.ini') print(config.sections()) # Output all section names found in 'example.ini' if not config.has_section('DEFAULT'): config.add_section('DEFAULT') config.set('DEFAULT', 'ServerAliveInterval', '45') with open('example.ini', 'w') as configfile: config.write(configfile) ``` This script demonstrates basic interaction with an `.ini` file containing various settings grouped under distinct headings. #### Troubleshooting When encountering issues related to initialization files, consider checking several common areas: - Verify syntax correctness according to expected format standards. - Ensure proper permissions exist so programs can access/read/write required entries. - Confirm compatibility among versions when upgrading components relying heavily on externalized properties. For instance, if facing problems configuring JVM heap sizes via `SGA_TARGET`, ensure appropriate values align well with overall memory constraints present in one's operational setup[^2]. --related questions-- 1. How do initialization files differ across operating systems? 2. What best practices should be followed while designing initialization files for large-scale distributed systems? 3. Can you provide examples of popular formats besides .ini used for storing configuration details? 4. In what scenarios might XML or JSON prove more advantageous over traditional flat-file structures for holding initialization info?
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