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:
proc_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:
(
@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
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