T-SQL 存储过程: (修订版) 根据基本表结构及其数据生成 INSERT INTO ... 的 SQL
根据基本表结构及其数据生成 INSERT INTO ... SQL 的 T-SQL 存储过程
,在网上能够搜索出的版本主要有两个:
1. CSDN Sky_blue 所作: proc_insert (可 google)
2. CSDN playyuer 所作: spGenInsertSQL (可 google)
但这两个版本的程序都曾收录到:
http://www.cnblogs.com/kasafuma/articles/109922.html
但这两个版本程序都有局限性:
如果字段太多或字段值的内容太多而无法生成完整正确的 insert into ... 的 SQL!
例如:
use
Northwindproc_insert
'
employees
'
spGenInsertSQL
'
employees
'
执行后均得不到完整正确的 SQL!
其实存储过程本身的代码应该是没有错误的
,只是因为字段太多或字段值的内容太多,varchar 变量容量不够大!
,应该算 Microsoft SQL Server 的缺陷
这个问题已经存在了很久了,长达至少两年多了!
今天终于被窝想到了解决办法,其实很简单:
这两个版本程序生成的 insert sql 都只用了一个字段(变量)
只要多用几个字段即可:
原来是: select f2+f2+f3+ ... +fn
现改为: select f2,f2,f3, ... ,fn
即可!
1.新版本,降低 "字段数量或字段值内容太多" 的影响 而尽量生成正确完整的 INSERT INTO ... SQL:
alter
procedure
Z_SP_GenInsertSQL(
@TableName
varchar
(
256
) ,
@AllTopClause
varchar
(
1000
)
=
''
,
@WhereOrderByClause
varchar
(
1000
)
=
''
--
'where 1 = 1 order by null'
)
as
begin
/**/
/*
usage:Z_SP_GenInsertSQL 'employees','all top 30 PERCENT with ties ','where [LastName] is not null order by employeeid desc'
*/
declare
@sql
varchar
(
8000
)
declare
@sqlValues
varchar
(
8000
)
set
@sql
=
'
''
(
'''
+
char
(
13
)
+
'
,
'
set
@sqlValues
=
'
values (
'''
+
char
(
13
)
+
'
,
'
select
@sqlValues
=
@sqlValues
+
cols
+
'
+
''
,
'
+
''''
+
char
(
13
)
+
'
,
'
,
@sql
=
@sql
+
'''
[
'
+
name
+
'
],
'''
+
char
(
13
)
+
'
,
'
from
(
select
case
when
xtype
in
(
48
,
52
,
56
,
59
,
60
,
62
,
104
,
106
,
108
,
122
,
127
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'
cast(
'
+
name
+
'
as varchar)
'
+
'
end
'
when
xtype
in
(
58
,
61
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'''''''''
+
'
+
'
cast(
'
+
name
+
'
as varchar)
'
+
'
+
'''''''''
+
'
end
'
when
xtype
in
(
167
,
175
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'''''''''
+
'
+
'
replace(
'
+
name
+
'
,
''''''''
,
''''''''''''
)
'
+
'
+
'''''''''
+
'
end
'
when
xtype
in
(
231
,
239
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'''
N
''''''
+
'
+
'
replace(
'
+
name
+
'
,
''''''''
,
''''''''''''
)
'
+
'
+
'''''''''
+
'
end
'
else
'''
NULL
'''
end
as
Cols ,name
from
syscolumns
where
id
=
object_id
(
@TableName
)
--
and autoval is null --忽略自增整型字段
) T
set
@sql
=
'
select
'
+
@AllTopClause
+
char
(
13
)
+
'''
INSERT INTO
'''
+
char
(
13
)
+
'
,
'
+
'''
[
'
+
@TableName
+
'
]
'''
+
char
(
13
)
+
'
,
'
+
left
(
@sql
,
len
(
@sql
)
-
4
)
+
''''
+
char
(
13
)
+
'
,
''
)
'
+
left
(
@sqlValues
,
len
(
@sqlValues
)
-
7
)
+
'
,
''
)
'''
+
char
(
13
)
+
'
from [
'
+
@TableName
+
'
]
'
+
char
(
13
)
+
@WhereOrderByClause
--
select @sql -- select SQL 被截断
print
@sql
--
print SQL 是完整正确的
exec
(
@sql
)
/**/
/*select *from syscolumns where id = object_id('test') and autoval is null*/
end
2.老版本 如果字段太多或字段值的内容太多而无法生成完整正确的 insert into ... 的 SQL
create
proc
Z_SP_GenInsertSQL (
@tablename
varchar
(
256
))
as
begin
declare
@sql
varchar
(
8000
)
declare
@sqlValues
varchar
(
8000
)
set
@sql
=
'
(
'
+
char
(
9
)
set
@sqlValues
=
'
values
'
+
char
(
9
)
+
'
(
'
+
char
(
9
)
+
'''
+
'
select
@sqlValues
=
@sqlValues
+
cols
+
'
+
''
,
'
+
char
(
9
)
+
'''
+
'
,
@sql
=
@sql
+
'
[
'
+
name
+
'
],
'
+
CHAR
(
9
)
from
(
select
case
when
xtype
in
(
48
,
52
,
56
,
59
,
60
,
62
,
104
,
106
,
108
,
122
,
127
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'
cast(
'
+
name
+
'
as varchar)
'
+
'
end
'
when
xtype
in
(
58
,
61
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'''''''''
+
'
+
'
cast(
'
+
name
+
'
as varchar)
'
+
'
+
'''''''''
+
'
end
'
when
xtype
in
(
167
,
175
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'''''''''
+
'
+
'
replace(
'
+
name
+
'
,
''''''''
,
''''''''''''
)
'
+
'
+
'''''''''
+
'
end
'
when
xtype
in
(
231
,
239
)
then
'
case when
'
+
name
+
'
is null then
''
NULL
''
else
'
+
'''
N
''''''
+
'
+
'
replace(
'
+
name
+
'
,
''''''''
,
''''''''''''
)
'
+
'
+
'''''''''
+
'
end
'
else
'''
NULL
'''
end
as
Cols,name
from
syscolumns
where
id
=
object_id
(
@tablename
)
and
autoval
is
null
) T
set
@sql
=
'
select
''
INSERT INTO
'
+
CHAR
(
9
)
+
'
[
'
+
@tablename
+
'
]
'
+
CHAR
(
9
)
+
left
(
@sql
,
len
(
@sql
)
-
2
)
+
char
(
9
)
+
'
)
'
+
CHAR
(
9
)
+
left
(
@sqlValues
,
len
(
@sqlValues
)
-
5
)
+
char
(
9
)
+
'
)
''
from
'
+
@tablename
print
@sql
exec
(
@sql
)
/**/
/**/
/**/
/*select *from syscolumns where id = object_id('test') and autoval is null*/
end
3. .Net/C# 版本请看:
http://www.cnblogs.com/Microshaoft/archive/2005/07/19/195752.html