同名字段替换找不到列 - VFP论坛

| 网站首页 | 业界新闻 | 小组 | 威客 | 人才 | 下载频道 | 博客 | 代码贴 | 在线编程 | 编程论坛 |

编程论坛 → 数据库技术 → 『 VFP论坛』 → 同名字段替换找不到列

我的收件箱(0)

欢迎加入我们，一同切磋技术

共有 1837 人关注过本帖

标题：同名字段替换找不到列

只看楼主加入收藏

fdqzy

等　级：新手上路
帖　子：368
专家分：0
注　册：2016-8-15
结帖率：73.97%

楼主

已结贴√ 问题点数：20 回复次数：18

同名字段替换找不到列

程序代码：

create cursor b1 (jnh N(2),m1 c(3),m2 c(3))
insert into b1 values (1,"","")
insert into b1 values (2,"","")
insert into b1 values (3,"","")
insert into b1 values (4,"","")
insert into b1 values (5,"","")

create cursor b2 (jnh N(2),m1 c(3),m2 c(3))
insert into b2 values (1,'M1',"")
insert into b2 values (3,"M1","M2")
insert into b2 values (4,"M1","")
***b1、b2字段名同，但记录数不同
SeLe   b1
mcount=Afields(marray)

      FOR i=1 TO mcount
         UPDATE b1 SET b1.marray(i,1)=b2.marray(i,1) from b2 WHERE b1.jnh==b2.jnh  &&用b2替换b1相同字段
      ENDFOR

运行时提示：SQL找不到列
但单独测试又找得到字段名
不知问题在哪？
如果部分字段名相同，能否用b2替换b1同名字段值？
如：

程序代码：

create cursor b1 (jnh N(2),,m0 c(3),m1 c(3),m2 c(3),m3 c(3),)
insert into b1 values (1,"","","","")
insert into b1 values (2,"","","","")
insert into b1 values (3,"","","","")
insert into b1 values (4,"","","","")
insert into b1 values (5,"","","","")

create cursor b2 (jnh N(2),m1 c(3),m2 c(3))
insert into b2 values (1,'M1',"")
insert into b2 values (3,"M1","M2")
insert into b2 values (4,"M1","")

[此贴子已经被作者于2020-10-22 18:16编辑过]

搜索更多相关主题的帖子: create　替换　 values　insert　into　

2020-10-22 17:41

sdta

来　自：江苏省连云港市
等　级：版主
威　望：335
帖　子：9841
专家分：27213
注　册：2012-2-5

第 2 楼

得分:10

程序代码：

create cursor b1 (jnh N(2),m1 c(3),m2 c(3))
insert into b1 values (1,"","")
insert into b1 values (2,"","")
insert into b1 values (3,"","")
insert into b1 values (4,"","")
insert into b1 values (5,"","")
INDEX on jnh TAG aa
create cursor b2 (jnh N(2),m1 c(3),m2 c(3))
insert into b2 values (1,'M1',"")
insert into b2 values (3,"M1","M2")
insert into b2 values (4,"M1","")
SET RELATION TO jnh INTO b1
SCAN 
    REPLACE m1 WITH b2.m1, m2 WITH b2.m2 IN b1
ENDSCAN 
SET RELATION TO
SELECT b1
SET ORDER TO 
BROWSE

坚守VFP最后的阵地

2020-10-22 18:21

sdta

来　自：江苏省连云港市
等　级：版主
威　望：335
帖　子：9841
专家分：27213
注　册：2012-2-5

第 3 楼

得分:0

程序代码：

create cursor b1 (jnh N(2),m0 c(3),m1 c(3),m2 c(3),m3 c(3))
insert into b1 values (1,"","","","")
insert into b1 values (2,"","","","")
insert into b1 values (3,"","","","")
insert into b1 values (4,"","","","")
insert into b1 values (5,"","","","")
INDEX on jnh TAG aa
create cursor b2 (jnh N(2),m1 c(3),m2 c(3))
insert into b2 values (1,'M1',"")
insert into b2 values (3,"M1","M2")
insert into b2 values (4,"M1","")
SET RELATION TO jnh INTO b1
SCAN 
    REPLACE m1 WITH b2.m1, m2 WITH b2.m2 IN b1
ENDSCAN 
SET RELATION TO
SELECT b1
SET ORDER TO 
BROWSE

坚守VFP最后的阵地

2020-10-22 18:25

fdqzy

等　级：新手上路
帖　子：368
专家分：0
注　册：2016-8-15

第 4 楼

得分:0

回复 3楼 sdta

辛苦版主！
能否在字段名用通用型？
上面的问题是替换字段太多，写代码麻烦，才提出此问题。

2020-10-22 18:45

sdta

来　自：江苏省连云港市
等　级：版主
威　望：335
帖　子：9841
专家分：27213
注　册：2012-2-5

第 5 楼

得分:0

解决问题要用实例
放上实际用表及要解决的问题

坚守VFP最后的阵地

2020-10-22 19:08

吹水佬

等　级：版主
威　望：451
帖　子：10607
专家分：43182
注　册：2014-5-20

第 6 楼

得分:10

b1.marray(i,1) 这样表达字段名不可以的吧
字段名变动的，之前的贴也有提到：
https://bbs.bccn.net/thread-503305-1-1.html
变通一下就可以

2020-10-22 19:50

fdqzy

等　级：新手上路
帖　子：368
专家分：0
注　册：2016-8-15

第 7 楼

得分:0

回复 6楼吹水佬

程序代码：

create cursor b1 (jnh N(2),m1 c(3),m2 c(3))
insert into b1 values (1,"","")
insert into b1 values (2,"","")
insert into b1 values (3,"","")
insert into b1 values (4,"","")
insert into b1 values (5,"","")

create cursor b2 (jnh N(2),m1 c(3),m2 c(3))
insert into b2 values (1,'M1',"")
insert into b2 values (3,"M1","M2")
insert into b2 values (4,"M1","")
SELECT b1
mcount=Afields(marray)
scan
      FOR i=2 TO mcount
         kk1='b1.'+marray(i,1)
         kk2='b2.'+marray(i,1)
              
         REPLACE (kk1) WITH EVALUATE(kk2) FOR b1.jnh==b2.jnh
      ENDFOR
endscan

或

程序代码：

SELECT b1
mcount=Afields(marray)
      FOR i=2 TO mcount
         kk1='b1.'+marray(i,1)
         kk2='b2.'+marray(i,1)
              
         REPLACE (kk1) WITH EVALUATE(kk2) FOR b1.jnh==b2.jnh
      ENDFOR

只替换b2最后一个值

[此贴子已经被作者于2020-10-22 20:25编辑过]

2020-10-22 20:23

fdqzy

等　级：新手上路
帖　子：368
专家分：0
注　册：2016-8-15

第 8 楼

得分:0

回复 6楼吹水佬

还是7楼的问题

[此贴子已经被作者于2020-10-22 20:41编辑过]

2020-10-22 20:32

吹水佬

等　级：版主
威　望：451
帖　子：10607
专家分：43182
注　册：2014-5-20

第 9 楼

得分:0

程序代码：

create cursor b1 (jnh N(2),m1 c(3),m2 c(3))
insert into b1 values (1,"","")
insert into b1 values (2,"","")
insert into b1 values (3,"","")
insert into b1 values (4,"","")
insert into b1 values (5,"","")

create cursor b2 (jnh N(2),m1 c(3),m2 c(3))
insert into b2 values (1,'M1',"")
insert into b2 values (3,"M1","M2")
insert into b2 values (4,"M1","")

SELECT b2
INDEX on jnh TAG jnh

SELECT b1
nCount = FCOUNT()
SET RELATION TO jnh INTO "b2"
SCAN
    IF FOUND("b2")
        FOR i=2 TO nCount 
            kk1='b1.'+FIELD(i)
            kk2='b2.'+FIELD(i)
            REPLACE (kk1) WITH EVALUATE(kk2)
        ENDFOR
    ENDIF
ENDSCAN
SET RELATION TO
BROWSE

2020-10-22 21:07

fdqzy

等　级：新手上路
帖　子：368
专家分：0
注　册：2016-8-15

第 10 楼

得分:0

第1个问题可以了

程序代码：

create cursor b1 (jnh N(2),m1 c(3),m2 c(3))
insert into b1 values (1,"","")
insert into b1 values (2,"","")
insert into b1 values (3,"","")
insert into b1 values (4,"","")
insert into b1 values (5,"","")

create cursor b2 (jnh N(2),m1 c(3),m2 c(3))
insert into b2 values (1,'M1',"")
insert into b2 values (3,"M1","M2")
insert into b2 values (4,"M1","")
SELECT b1
mcount1=Afields(marray1)
SELECT b2
mcount2=Afields(marray2)
SELECT 1

      FOR i=2 TO mcount1
         kk1='b1.'+marray1(i,1)
         kk2='b2.'+marray2(i,1)
         UPDATE b1 SET &kk1=&kk2 from b2 WHERE b1.jnh==b2.jnh     
        
      ENDFOR
     
brow

[此贴子已经被作者于2020-10-22 21:11编辑过]

2020-10-22 21:09

快速回复：同名字段替换找不到列