★ Migrating Data

When migrating between Courion environments I often run into situations where I need to not only migrate the structure of a table, but also the data. This is most common when migrating configuration tables. I looked for some SQL that would generate insert statements from a given table, and came across this blog entry.

This solution was not perfect, as it didn’t properly handle columns with spaces or that used reserved words in their names.  Luckily someone else had fixed this and placed the solution in the comments.  There is still one drawback that it handles empty columns as NULLs, but it still handles 90% of the work.  If I have the time, I’ll try to work that out and post an updated solution.

SQL Code and usage after the jump.

Usage:

Past the code below in Query Analyzer, replacing the line

and name like 'AMEX%'

with the appropriate where clause to find your tables.  You should then be able to run it and it will generate your SQL.

SQL Code:

create table #tmp (
SQLText varchar(8000) )

create table #tmp2 (
Id int identity,
SQLText varchar(8000) )

set nocount on

delete #tmp
delete #tmp2

declare @vsSQL varchar(8000),
@vsCols varchar(8000),
@vsTableName varchar(40)

declare csrTables cursor for
select name
from sysobjects
where type in ('u')
and name like 'AMEX%'
order by name

open csrTables
fetch next from csrTables into @vsTableName

while (@@fetch_status = 0)
begin

select @vsSQL = '',
@vsCols = ''
select @vsSQL = @vsSQL +
CASE when sc.type in (39,47,61,111) then
'''''''''+' + 'isnull(rtrim(replace(['+ sc.name + '],'''''''','''''''''''')),'''')' + '+'''''',''+'
when sc.type = 35 then
'''''''''+' + 'isnull(rtrim(replace(substring(['+ sc.name + '],1,1000),'''''''','''''''''''')),'''')' + '+'''''',''+'
else
'isnull(convert(varchar,[' + sc.name + ']),''null'')+'',''+'
end
from syscolumns sc
where sc.id = object_id(@vsTableName)
order by ColID

select @vsCols = @vsCols + quotename(sc.name,'[') + ','
from syscolumns sc
where sc.id = object_id(@vsTableName)
order by ColID

select @vsSQL = substring(@vsSQL,1,datalength(@vsSQL)-1)

select @vsCols = substring(@vsCols,1,datalength(@vsCols)-1)

insert #tmp
exec ('select ' + @vsSQL + ' from ' + @vsTableName)

update #tmp
set sqltext = 'insert ' + @vsTableName + '(' + @vsCols + ') values(' + substring(sqltext,1,datalength(sqltext)-1) + ')'

insert #tmp2
select 'DELETE from ' + @vsTableName

insert #tmp2 values ('GO')

if (select count(id) from syscolumns where id = object_id(@vsTableName) and ((status & 128) = 128) ) = 1
begin
insert #tmp2
select 'set identity_insert ' + @vsTableName + ' on'
end

insert #tmp2
select * from #tmp

if (select count(id) from syscolumns where id = object_id(@vsTableName) and ((status & 128) = 128) ) = 1
begin
insert #tmp2
select 'set identity_insert ' + @vsTableName + ' off'
end

insert #tmp2 values ('GO')

insert #tmp2
select 'update statistics ' + @vsTableName

insert #tmp2 values ('GO')

delete #tmp

fetch next from csrTables into @vsTableName

end

close csrTables
deallocate csrTables

update #tmp2
set sqltext = substring(sqltext,1,charindex(',)',sqltext)-1) + ',NULL)'
where not(charindex(',)',sqltext) = 0)

update #tmp2
set sqltext = replace(sqltext, ',''''',',null')
where not (charindex(',''''',sqltext) = 0)

update #tmp2
set sqltext = replace(sqltext, '(''''',',null')
where not (charindex('(''''',sqltext) = 0)

set nocount off

select sqltext from #tmp2 order by id

go

drop table #tmp
drop table #tmp2

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