alter column 产生批量修改字段的脚本

该脚本使用场景：大规模的修改字段，该脚本只是产生修改的脚本并不会做alter column修改

譬如本实例下不同db不同table总共有1000个字段需要修改

/*
功能描述:
1.批量产生修改表字段脚本
2.@filter设置过滤类型长度相同的修改
3. 考虑因素( default_constraint/check_constraint/index/full_index/statistics)
使用方法:
@filter 设置过滤， @s 输入需要修改的cloumn 
潜在问题:数据类型考虑不完全，有可能部分数据类型过滤功能无法使用,这只是根据自己工作需要编写的部分功能

*/

USE master
GO
SET NOCOUNT ON
DECLARE @s varchar(max)
DECLARE @sql varchar(max)
DECLARE @x xml
declare @filter int;
set @filter=0  -- 1:filter ChangeTotype=currenttype   0 do nothing
/*****INPUT*******************
dbname;tbname;columnname;ChangeTotype
*/
/*
mydb;fullindex;cc;varchar(30)
test;fullindex;cb;varchar(30)
test;fullindex;cc;varchar(30)
*/

SET @s = '
mydb;fullindex;cc;varchar(30)
test;fullindex;cb;varchar(30)
test;fullindex;cc;varchar(30)

'
IF OBJECT_ID('tempdb.dbo.#lynn_tbinfo') IS NOT NULL
    DROP TABLE #lynn_tbinfo
CREATE TABLE #lynn_tbinfo
(
    ID int identity(1,1) PRIMARY KEY,
    DBName varchar(500),
    TbName varchar(500),
    ColName varchar(500),
    ChangeTotype varchar(500),
    Size_MB decimal(20,2),
    Rows bigint,
    currenttype  varchar(500),
    is_nullable int,
    ischaged int,
    alterscript nvarchar(max) 

)
DECLARE @tt table
(
    COL varchar(max)
)
SELECT
    @sql = '',
    @s = N'<root><col>' + REPLACE(@s,CHAR(10),N'</col><col>') + N'</col></root>',
            @x = CONVERT(xml,@s)
INSERT @tt
    SELECT
                REPLACE(REPLACE(REPLACE(REPLACE(col,CHAR(10),N''),CHAR(10),N''),CHAR(9),N''),';','.') AS COL
    FROM
    (
                SELECT
                            REPLACE( REPLACE(RTRIM(LTRIM(T.c.value(N'(text())[1]',N'nvarchar(300)'))),CHAR(10),N''),' ','') AS col
                FROM @x.nodes('/root/col') T(c)
    )A
    WHERE A.col IS NOT NULL
   
--
insert into #lynn_tbinfo(DBName,TbName,ColName,ChangeTotype)
SELECT PARSENAME(COL,4),PARSENAME(COL,3),PARSENAME(COL,2),PARSENAME(COL,1) FROM @tt 
--SELECT * FROM #lynn_tbinfo


--***get current size & rows & column type    begin--
IF OBJECT_ID('tempdb.dbo.#getsize') IS NOT NULL
    DROP TABLE #getsize
create table #getsize
(
    dbname varchar(500)
    ,tbname varchar(500)
    ,Size_MB decimal(20,2)
    ,rows bigint
)

if OBJECT_ID('tempdb..#currenttype','U') is not null
    drop table #currenttype
create table #currenttype(
    dbname varchar(200),
    tbname varchar(200),
    columnname varchar(200),
    columntype varchar(200),
    columnlength varchar(10),
    precision int,
    scale int,
    currenttype  varchar(20),
    is_nullable int
)


IF OBJECT_ID('tempdb.dbo.#indexinfo') IS NOT NULL
    DROP TABLE #indexinfo
create table #indexinfo
(
    id int identity(1,1) primary key,
    dbname varchar(500),
    index_ix bigint,
    tbname varchar(500),
    colname    varchar(500),
    ix_name    varchar(500),
    type_desc  varchar(50),    
    is_unique    int,
    is_primary_key    int,
    fill_factor    int,
    has_filter    int,
    is_disabled    int,
    filter_definition varchar(2000),    
    index_column_id    int,
    is_descending_key int,
    is_included_column int,
    dropscript nvarchar(max),
    createscript nvarchar(max)
)

IF OBJECT_ID('tempdb.dbo.#dfinfo') IS NOT NULL
    DROP TABLE #dfinfo
create table #dfinfo
(
    id int identity(1,1) primary key,
    dbname varchar(500),
    tbname varchar(500),
    dfname  varchar(500),
    definition nvarchar(max),
    colname    varchar(500),
    dropscript nvarchar(max),
    createscript nvarchar(max)
)

IF OBJECT_ID('tempdb.dbo.#stinfo') IS NOT NULL
    DROP TABLE #stinfo
create table #stinfo
(
    id int identity(1,1) primary key,
    dbname varchar(500),
    tbname varchar(500),
    stname  varchar(500),
    has_filter int,
    filter_definition nvarchar(max),
    colname    varchar(500),
    stats_column_id int,
    dropscript nvarchar(max),
    createscript nvarchar(max)
)
IF OBJECT_ID('tempdb.dbo.#ckinfo') IS NOT NULL
    DROP TABLE #ckinfo
create table #ckinfo
(
    id int identity(1,1) primary key,
    dbname varchar(500),
    tbname varchar(500),
    ckname  varchar(500),
    colname    varchar(500),
    definition nvarchar(max),
    dropscript nvarchar(max),
    createscript nvarchar(max)
)


IF OBJECT_ID('tempdb.dbo.#fullindexinfo') IS NOT NULL
    DROP TABLE #fullindexinfo
create table #fullindexinfo
(
    id int identity(1,1) primary key,
    dbname varchar(500),
    tbname varchar(500),
    colname  varchar(500),
    ix_name varchar(500),
    catelogname    varchar(500),
    is_enabled int,
    dropscript nvarchar(max),
    createscript nvarchar(max)
)


declare @sizesql1 nvarchar(max),@sizesql2 nvarchar(max)
        ,@db nvarchar(500),@tb nvarchar(500);
declare @typesqll Nvarchar(max),@typesql2 Nvarchar(max),@colname nvarchar(500);
SELECT @sizesql1=N'
use {dbname}
insert into #getsize(dbname,tbname,Size_MB,rows)
select ''{dbname}'',''{tbname}'', cast(SUM (reserved_page_count)*8.0/1024 as decimal(20,2)),
SUM (    CASE  WHEN (index_id < 2) THEN row_count  ELSE 0  END   )  
from sys.dm_db_partition_stats  where object_id = object_id(''{tbname}'')
'

select @typesqll=N'
use {dbname}
insert into #currenttype(dbname,tbname,columnname,columntype,columnlength,precision,scale,is_nullable)
select DB_NAME(),OBJECT_NAME(co.object_id) as tbname, co.name as colname, ty.name typename,
  length=case 
              when co.max_length=-1 then ''max''
              when ty.name like ''N%''   then cast(co.max_length/2 as varchar(10))
       else cast(co.max_length as varchar(10)) end,
co.precision,co.scale,
  co.is_nullable
from sys.columns as co with(nolock)
inner join sys.types as ty with(nolock)
  on ty.user_type_id=co.user_type_id
inner join sys.tables as t
   on t.object_id=   co.object_id 
 where OBJECT_NAME(co.object_id)= ''{tbname}'' and co.name= ''{colname}''  
 '

declare @getinfo1 nvarchar(max),@getinfo2 nvarchar(max);
select @getinfo1=N'use [{db}]
--index
;with ixinfo 
as(
select  
IX.index_id ,object_name(ix.object_id) tbname ,co.name colname,ix.name ixname,ix.type_desc ,ix.is_unique,ix.is_primary_key,ix.fill_factor,ix.has_filter,ix.is_disabled,ix.filter_definition
,ixc.index_column_id,ixc.is_descending_key,ixc.is_included_column
from sys.indexes as ix with(nolock)  
inner join sys.index_columns as ixc with(nolock)  
      on ixc.object_id=ix.object_id  AND IX.index_id=IXC.index_id 
inner join sys.columns as co with(nolock)
    on co.object_id=ix.object_id  and co.column_id=ixc.column_id
)
,ixinfoa 
as(
select 
    distinct ixa.index_id,ixa.ixname,ixa.tbname 
from ixinfo as ixa
inner join #lynn_tbinfo as t
    on t.DBName=DB_NAME() and t.TbName=ixa.tbname and t.ColName=ixa.colname
)
insert into #indexinfo
select  DB_NAME(),ixb.* ,NULL,NULL
from ixinfo as ixb
inner join ixinfoa ixc
        on ixc.index_id=ixb.index_id and ixc.tbname=ixb.tbname
order by ixb.tbname, ixb.index_id;
--df
insert into #dfinfo
select 
DB_NAME(),OBJECT_NAME(cof.object_id) tbname
,df.name dfname, df.definition,
cof.name colname
,NULL,NULL
FROM sys.default_constraints as df WITH(NOLOCK)  
inner join sys.columns as cof  WITH(NOLOCK) 
on cof.object_id=df.parent_object_id  and cof.column_id=df.parent_column_id
inner join #lynn_tbinfo as ldf
    on ldf.DBName=DB_NAME() and object_id(ldf.TbName)=cof.object_id and ldf.ColName=cof.name;
--stat
;with stat 
as(
SELECT 
    object_name(cs.object_id) tbname,st.name stname,st.has_filter,st.filter_definition,
    cs.name colname,stc.stats_column_id
from sys.stats as st with(nolock)  
inner join sys.stats_columns as stc with(nolock)  
      on st.object_id=stc.object_id  and  st.stats_id=stc.stats_id  
inner join sys.columns cs  with(nolock) 
        on cs.object_id=st.object_id  and cs.column_id=stc.column_id  and st.user_created=1
)
,stat2
as(
  select distinct s1.tbname, s1.stname  from  stat as s1
    inner join #lynn_tbinfo as ls
        on ls.DBName=DB_NAME() and ls.TbName=s1.tbname and ls.ColName=s1.colname
)
insert into #stinfo
select DB_NAME(),s2.*
,NULL,NULL
from stat as s2
inner join stat2 s3
    on s3.tbname=s2.tbname and s3.stname=s2.stname ;   
--check
insert into #ckinfo
SELECT DB_NAME(),
OBJECT_NAME(cc.object_id) tbname,ck.name ckname,cc.name colname,ck.definition
,NULL,NULL
FROM  SYS.check_constraints as ck with(nolock)
inner join sys.columns as cc with(nolock)
    on cc.object_id=ck.parent_object_id and cc.column_id=ck.parent_column_id 
inner join #lynn_tbinfo  lc
    on lc.dbname=DB_NAME() and object_id(lc.tbname)=cc.object_id  and lc.colname=cc.name;

insert into #fullindexinfo
select 
DB_NAME(),OBJECT_NAME(fi.object_id) tbname,fcl.name colname,fix.name ix_name,fc.name catelogname,fi.is_enabled
,NULL,NULL
from sys.fulltext_indexes  as fi with(nolock)
inner join  sys.fulltext_index_columns as fic with(nolock)
    on fic.object_id=fi.object_id
inner join sys.fulltext_index_catalog_usages as ficu  with(nolock)
    on ficu.object_id=fi.object_id
inner join sys.fulltext_catalogs as fc with(nolock)
    on fc.fulltext_catalog_id=ficu.fulltext_catalog_id
inner join sys.indexes as fix with(nolock)
    on fix.object_id=fi.object_id and fix.index_id= fi.unique_index_id
inner join sys.columns as fcl  with(nolock)
    on fcl.object_id=fi.object_id and fcl.column_id= fic.column_id
where exists(
select top(1) 1 from #lynn_tbinfo  flcc  with(nolock)
    where flcc.DBName=DB_NAME() and object_id(flcc.TbName)=fi.object_id and flcc.ColName=fcl.name
)
or exists(
select top(1) 1 from #indexinfo flix  with(nolock)
    where flix.DBName=DB_NAME() and flix.tbname=OBJECT_NAME(fi.object_id) and flix.ix_name=fix.name
);

--inner join #lynn_tbinfo  flcc  with(nolock)
--    on flcc.DBName=DB_NAME() and object_id(flcc.TbName)=fi.object_id and flcc.ColName=fcl.name;
'
 
DECLARE lynncursor CURSOR  LOCAL STATIC FORWARD_ONLY READ_ONLY 
    FOR  
    SELECT distinct  DBName from #lynn_tbinfo with(nolock)

    OPEN lynncursor      
    FETCH NEXT FROM lynncursor INTO @db
    WHILE @@fetch_status = 0      
      BEGIN   

                select @getinfo2= REPLACE(@getinfo1,'{db}',@db)
                EXECUTE sp_executesql @getinfo2;   

        DECLARE lynncursor2 CURSOR  LOCAL STATIC FORWARD_ONLY READ_ONLY 
        FOR  
            SELECT distinct TbName from #lynn_tbinfo with(nolock) where dbname=@db
        OPEN lynncursor2
        FETCH NEXT FROM lynncursor2 INTO  @tb 
        WHILE @@fetch_status = 0 
            BEGIN

                select @sizesql2=''
                select @sizesql2=replace( replace (@sizesql1,'{dbname}',@db),'{tbname}',@tb)
                exec sp_executesql @sizesql2
    
                DECLARE lynncursor3 CURSOR  LOCAL STATIC FORWARD_ONLY READ_ONLY 
                FOR  
                SELECT distinct  colname from #lynn_tbinfo with(nolock) where dbname=    @db and tbname=@tb
                OPEN lynncursor3      
                FETCH NEXT FROM lynncursor3 INTO @colname
                WHILE @@fetch_status = 0   
                    BEGIN
                
                        select @typesql2= REPLACE(REPLACE( REPLACE(@typesqll,'{dbname}',@db), '{tbname}',@tb ),'{colname}',@colname)
                        EXECUTE sp_executesql @typesql2;
                        
                        FETCH NEXT FROM lynncursor3 INTO @colname
                    END
                CLOSE lynncursor3      
                DEALLOCATE lynncursor3

                FETCH NEXT FROM lynncursor2 INTO  @tb 
            END
        CLOSE lynncursor2      
        DEALLOCATE lynncursor2

        FETCH NEXT FROM lynncursor INTO  @db
    END  
    CLOSE lynncursor      
    DEALLOCATE lynncursor


update #currenttype
set currenttype=case    
    when columntype IN('varchar','nvarchar','char','nchar','binary') then  columntype+'('+CAST(columnlength AS varchar(10))+')'
    when columntype IN ('decimal') then columntype+'('+CAST(precision AS varchar(10))+','+CAST(scale AS varchar(10))+')'
 else columntype
end 

 --update currenttype into #lynn_tbinfo
update  ii
set  ii.currenttype=c.currenttype
    ,ii.is_nullable=c.is_nullable
    ,ii.ischaged= case when ii.ChangeTotype=c.currenttype then 1 else 0 end
from #lynn_tbinfo as ii
inner join #currenttype as c
    on ii.dbname=c.dbname  and ii.tbname=c.tbname and ii.ColName=c.columnname

  --update size & rows into #lynn_tbinfo
update  i
set  i.Size_MB=g.Size_MB
    ,i.Rows=g.rows
from #lynn_tbinfo as i
inner join #getsize as g
    on i.dbname=g.dbname  and i.tbname=g.tbname

IF OBJECT_ID('tempdb.dbo.#getsize') IS NOT NULL
    DROP TABLE #getsize
IF OBJECT_ID('tempdb.dbo.#currenttype') IS NOT NULL
    DROP TABLE #currenttype




IF OBJECT_ID('tempdb.dbo.#lynn_result') IS NOT NULL
    DROP TABLE #lynn_result
CREATE TABLE #lynn_result
(
    ID int identity(1,1) PRIMARY KEY,
    DBName varchar(500),
    TbName varchar(500),
    Size_MB decimal(20,2),
    Rows int,
    inputcolumns int,
    altercolumns int,
    dropscript nvarchar(max),
    alterscript nvarchar(max),
    addscript nvarchar(max)

)

insert into #lynn_result(DBName,TbName,inputcolumns)
select  DBName,TbName,count(1) as colcount from #lynn_tbinfo
group by DBName,TbName

--select * from #lynn_result
if @filter=1
    delete #lynn_tbinfo where ischaged=1


;with co (DBName,TbName,colcount)
as(
    select  DBName,TbName,count(1) as colcount from #lynn_tbinfo
    group by DBName,TbName
)
update  r
set altercolumns= isnull(co.colcount,0)
from   #lynn_result as r
left join co
on co.dbname=r.dbname and co.tbname=r.tbname


update #lynn_tbinfo
set alterscript='ALTER TABLE DBO.['+TbName+'] ALTER COLUMN ['+colname+'] '+ changetotype+' '+ REPLACE(REPLACE(is_nullable,0,'NOT'),1,'') + ' NULL'


update #indexinfo
set dropscript=
    case when is_primary_key=1
    then 'if exists( select top(1) 1 from sys.indexes  with(nolock) where object_id=object_id('''+tbname+''') and name='''+ix_name+''')'
        +char(10)+'    ALTER TABLE DBO.['+tbname+'] DROP CONSTRAINT  ['+ix_name+']'
    else 'if exists( select top(1) 1 from sys.indexes  with(nolock) where object_id=object_id('''+tbname+''') and name='''+ix_name+''')'
        +char(10)+'    DROP INDEX ['+ix_name+'] ON dbo.['+tbname+']'
    end
    ,createsCript= 'if not exists( select top(1) 1 from sys.indexes  with(nolock) where object_id=object_id('''+tbname+''') and name='''+ix_name+''')'
        +char(10)+
    case when is_primary_key=1
    then '    ALTER TABLE dbo.['+tbname+'] ADD CONSTRAINT ['+ix_name+'] PRIMARY KEY '+ type_desc

    else '    CREATE '+case when is_unique=1 then ' UNIQUE ' ELSE '' END
    +type_desc+' INDEX ['+ix_name+'] ON DBO.['+tbname+']'

    end
; 

update #stinfo
set dropscript='if exists( select top(1) 1 from sys.stats with(nolock) where name='''+stname+''' and object_id=object_id('''+tbname+''') )'
            +char(10)+'    DROP STATISTICS dbo.['+tbname+'].['+stname+']'
    ,createsCript='if not exists( select top(1) 1 from sys.stats with(nolock) where name='''+stname+''' and object_id=object_id('''+tbname+''') )'
            +char(10)+'    CREATE STATISTICS ['+stname+'] ON DBO.['+tbname+']'

update #dfinfo
    set dropscript='if exists( select top(1) 1 from sys.default_constraints  with(nolock) where parent_object_id=object_id('''+tbname+''') and name='''+dfname+''' )'
        +char(10)+'    ALTER TABLE DBO.['+tbname+'] DROP CONSTRAINT  ['+dfname+']'
    ,createsCript='if not exists( select top(1) 1 from sys.default_constraints  with(nolock) where parent_object_id=object_id('''+tbname+''') and name='''+dfname+''' )'
        +char(10)+'    ALTER TABLE DBO.['+tbname+'] ADD CONSTRAINT  ['+dfname+'] DEFAULT '+[definition]+' FOR ['+colname+']';

update #ckinfo
    set dropscript='if exists( select top(1) 1 from sys.check_constraints  with(nolock) where parent_object_id=object_id('''+tbname+''') and name='''+ckname+''' )'
            +char(10)+'    ALTER TABLE DBO.['+tbname+'] DROP CONSTRAINT  ['+ckname+']'
        ,createsCript='if not exists( select top(1) 1 from sys.check_constraints  with(nolock) where parent_object_id=object_id('''+tbname+''') and name='''+ckname+''' )'
            +char(10)+'    ALTER TABLE DBO.['+tbname+'] ADD CONSTRAINT ['+ckname+'] CHECK '+ [definition]    ;

UPDATE #fullindexinfo
    SET dropscript='DROP FULLTEXT INDEX ON DBO.['+tbname+']'
        ,createsCript='CREATE FULLTEXT INDEX ON DBO.['+tbname+'](['+ colname + ']) KEY INDEX '+ix_name;


--SELECT * FROM #lynn_tbinfo
--select 'index',* from #indexinfo order  by dbname,tbname,ix_name
--select 'df',* from #dfinfo
--select 'sta',* from #stinfo
--select 'check',* from #ckinfo
--select 'fullindex',* from #fullindexinfo



DECLARE @db4 varchar(500),@tb4 varchar(500),@ixname varchar(500),@stname varchar(500);
DECLARE @list varchar(2000),@includelist varchar(2000),@filtersql varchar(2000),@withsql varchar(2000) 
    ,@totalsql VARCHAR(MAX);


DECLARE lynncursor4 CURSOR   LOCAL  STATIC  FORWARD_ONLY  READ_ONLY 
FOR  
    select distinct dbname,tbname from  #lynn_tbinfo with(nolock)

OPEN lynncursor4      
FETCH NEXT FROM lynncursor4 INTO @db4, @tb4
WHILE @@fetch_status = 0      
  BEGIN      
  --ix
    DECLARE lynncursor5 CURSOR   LOCAL  STATIC  FORWARD_ONLY  READ_ONLY 
    FOR  
     select distinct ix_name  from #indexinfo with(nolock) where dbname=@db4 and tbname=@tb4 

    OPEN lynncursor5      
    FETCH NEXT FROM lynncursor5 INTO @ixname
    WHILE @@fetch_status = 0      
        BEGIN  
            select @list='',@includelist='',@filtersql='',@withsql='',@totalsql='';

            select @list=@list+','+'['+colname+']'+ case  is_descending_key when 1 then ' DESC'  ELSE ' ASC' END
            from #indexinfo where dbname=@db4 and tbname=@tb4 and  ix_name =@ixname and is_included_column=0
            order by index_column_id


            select @includelist=@includelist+','+'['+colname+']'
            from #indexinfo where dbname=@db4 and tbname=@tb4 and  ix_name =@ixname and is_included_column=1 
            order by index_column_id
            
            select  @list='('+SUBSTRING(@list,2,5000)+')'
            select  @includelist='('+SUBSTRING(@includelist,2,5000)+')'
            IF @includelist='()'
                SELECT @includelist=''

            select top(1) @filtersql=filter_definition  from #indexinfo 
            where dbname=@db4 and tbname=@tb4 and  ix_name =@ixname and filter_definition is not null

            select top(1) @withsql= 'WITH (FILLFACTOR='+CAST(fill_factor AS VARCHAR(3))+')' from #indexinfo 
            where dbname=@db4 and tbname=@tb4 and  ix_name =@ixname  AND fill_factor<>0

             --select @ixname,@ixlist,@includelist,@wheresql,@withsql
             select @totalsql=CHAR(10)+'    '+@list+case when @includelist<>'' then  ' INCLUDE '+ @includelist  ELSE '' END
                        +case when @filtersql<>'' then  ' WHERE '+ @filtersql  ELSE '' END
                        +@withsql
                    
            
            --SELECT @ixsql
    
            UPDATE #indexinfo
            SET createsCript=createsCript+@totalsql
            WHERE dbname=@db4 and tbname=@tb4 and  ix_name =@ixname
        
        
            FETCH NEXT FROM lynncursor5 INTO @ixname
        END
        CLOSE lynncursor5     
        DEALLOCATE lynncursor5


        DECLARE lynncursor6 CURSOR   LOCAL  STATIC  FORWARD_ONLY  READ_ONLY 
        FOR  
        select distinct stname  from #stinfo with(nolock) where dbname=@db4 and tbname=@tb4 
        OPEN lynncursor6      
        FETCH NEXT FROM lynncursor6 INTO @stname
        WHILE @@fetch_status = 0      
        BEGIN  

            SELECT @list='',@filtersql='',@totalsql=''

            SELECT @list=@list+','+'['+colname+']' from  #stinfo where dbname=@db4 and tbname=@tb4  and stname=@stname order by stats_column_id
            SELECT  @list='('+SUBSTRING(@list,2,5000)+')'
            --select @list
            select top(1) @filtersql=filter_definition  from  #stinfo where  dbname=@db4 and tbname=@tb4  and stname=@stname  and has_filter=1
            --SELECT @filtersql

            SELECT  @totalsql='    '+@list+case when @filtersql<>'' then  ' WHERE '+ @filtersql  ELSE '' END
            --SELECT @totalsql

            UPDATE #stinfo
            SET createsCript=createsCript+@totalsql
            WHERE dbname=@db4 and tbname=@tb4 and  stname =@stname


        FETCH NEXT FROM lynncursor6 INTO @stname
        END 
        CLOSE lynncursor6    
        DEALLOCATE lynncursor6

    FETCH NEXT FROM lynncursor4 INTO @db4, @tb4
  END  
CLOSE lynncursor4      
DEALLOCATE lynncursor4




DECLARE @fdb varchar(500),@ftb varchar(500), @fSize_MB decimal(20,2), @fRows bigint ;
DECLARE @dropsql nvarchar(max),@altersql nvarchar(max),@addsql nvarchar(max);
DECLARE @tempcounter varchar(20);

DECLARE lynn CURSOR  LOCAL  STATIC  FORWARD_ONLY  READ_ONLY 
FOR  
    SELECT DBName,TbName,Size_MB,[Rows] from #lynn_tbinfo with(nolock) 
    group by  DBName,TbName,Size_MB,[Rows]
    order by DBName,TbName,Size_MB,[Rows]

OPEN lynn      
FETCH NEXT FROM lynn INTO @fdb ,@ftb,@fSize_MB,@fRows
WHILE @@fetch_status = 0      
  BEGIN      
--Put your code here to use @your_variable
    select @altersql='',@dropsql='',@addsql='';

    --drop full index
    if exists (select top(1) 1 from   #fullindexinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @dropsql=@dropsql+'--***** drop full index *****'+char(10)
        select @dropsql=@dropsql+dropscript+char(10) from #fullindexinfo where dbname=@fdb and tbname=@ftb;
    end 

    --drop index
    if exists(select top(1) 1 from  #indexinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @dropsql=@dropsql+'--***** drop index *****'+char(10)
        ;with  lynnix
        as( select distinct ix_name,type_desc,dropscript from #indexinfo  where dbname=@fdb and tbname=@ftb)
        select @dropsql=@dropsql+dropscript+char(10)
        from lynnix order by type_desc desc
    end
    --drop sta
    if exists (select top(1) 1 from   #stinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @dropsql=@dropsql+'--***** drop state *****'+char(10)
        ;with  lynnst
        as(select distinct  dropscript from   #stinfo  where dbname=@fdb and tbname=@ftb )
        select @dropsql=@dropsql+dropscript+char(10) from lynnst
    end
    --drop check
    if exists (select top(1) 1 from   #ckinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @dropsql=@dropsql+'--***** drop check *****'+char(10)
        select @dropsql=@dropsql+dropscript+char(10) from #ckinfo where dbname=@fdb and tbname=@ftb
    end
    --drop default
    if exists (select top(1) 1 from   #dfinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @dropsql=@dropsql+'--***** drop default *****'+char(10)
        select @dropsql=@dropsql+dropscript+char(10) from #dfinfo where dbname=@fdb and tbname=@ftb;
    end 
    --drop full index
    --if exists (select top(1) 1 from   #fullindexinfo  where dbname=@fdb and tbname=@ftb )
    --begin 
    --    select @dropsql=@dropsql+char(10)+'--***** drop full index *****'
    --    select @dropsql=@dropsql+char(10)+dropscript from #fullindexinfo where dbname=@fdb and tbname=@ftb;
    --end 

    --alter column
    select @altersql=@altersql+'--***** alter column *****'+char(10)

    select @tempcounter =cast( count(1) as varchar(20)) from #lynn_tbinfo  where dbname=@fdb and tbname=@ftb 
    
    ;with lynnalter
    as(
        select 
            tbname,colname,alterscript,ROW_NUMBER() OVER(ORDER BY colname ) as id,@tempcounter as coun 
        from #lynn_tbinfo 
        where dbname=@fdb and tbname=@ftb             
    ),lynnalter1
    as(
    select *,'t'+CAST(id as varchar(20))+'a' as t1, 't'+CAST(id as varchar(20))+'b' as t2  from lynnalter
    )
    select @altersql = @altersql+
    'declare @'+t1+' datetime=getdate(),@'+t2+' varchar(20)'
    +char(10)+alterscript+char(10)
    +'select @'+t2+'=cast( cast( DATEDIFF(second ,@'+t1+',getdate())/60.0  as decimal(12,1) )  as varchar(20))'
    +char(10)+'RAISERROR(''Col['+cast(coun as varchar(20))+'/'+cast(id as varchar(20))+']:    ['+[colname] +'] is done.        %s minutes'',10,1,@'+t2+') WITH NOWAIT  '+char(10)+'GO'+char(10)
    from lynnalter1


    --add df
    if exists (select top(1) 1 from   #dfinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @addsql=@addsql+'--***** add default *****'+char(10)
        select @addsql=@addsql+createscript+char(10) from #dfinfo where dbname=@fdb and tbname=@ftb;
    end 
    --add ck
    if exists (select top(1) 1 from   #ckinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @addsql=@addsql+'--***** add check *****'+char(10)
        select @addsql=@addsql+createscript+char(10) from #ckinfo where dbname=@fdb and tbname=@ftb
    end
    --add index
    if exists(select top(1) 1 from  #indexinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @addsql=@addsql+'--***** add index *****'+char(10)
        --;with  lynnix
        --as( select distinct ix_name,type_desc,createscript from #indexinfo  where dbname=@fdb and tbname=@ftb)
        --select @addsql=@addsql+char(10)+createscript
        --from lynnix order by type_desc 
    
        select @tempcounter=cast( count(1) as varchar(20))
        from (select distinct dbname, ix_name  from #indexinfo  where dbname=@fdb and tbname=@ftb  
        ) as aa
    
        
        ;with ly
        as
        (            select distinct  ix_name,type_desc,createscript 
            from #indexinfo  where dbname=@fdb and tbname=@ftb
        ) 
        ,lynnix
        as( 
            select   ix_name,type_desc,createscript,ROW_NUMBER() OVER(ORDER BY type_desc ) as id,@tempcounter as coun  
            from ly  )
        ,lynnix1
        as(select *,'t'+cast(id as varchar(10))+'a' as t1, 't'+cast(id as varchar(10))+'b' as t2  from  lynnix 
        )
        select @addsql=@addsql+
        'declare @'+t1+' datetime=getdate(),@'+t2+' varchar(20)'
        +char(10)+createscript+char(10)
        +'select @'+t2+'=cast( cast( DATEDIFF(second ,@'+t1+',getdate())/60.0  as decimal(12,1) )  as varchar(20))'
        +char(10)+'RAISERROR(''IX['+cast(coun as varchar(20))+'/'+cast(id as varchar(20))+']:    ['+ix_name +'] is done.    %s minutes'',10,1,@'+t2+') WITH NOWAIT  '+char(10)+'GO'+char(10)
        from lynnix1 order by type_desc 

    end
    --add sta
    if exists (select top(1) 1 from   #stinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @addsql=@addsql+'--***** add state *****'+char(10)
        ;with  lynnst
        as(select distinct  createscript from   #stinfo  where dbname=@fdb and tbname=@ftb )
        select @addsql=@addsql+createscript+char(10) from lynnst
    end
    --add full index
    if exists (select top(1) 1 from   #fullindexinfo  where dbname=@fdb and tbname=@ftb )
    begin 
        select @addsql=@addsql+'--***** add full index *****'+char(10)
        select @addsql=@addsql+createscript+char(10) from #fullindexinfo where dbname=@fdb and tbname=@ftb;
    end 

    --select @dropsql,@altersql,@addsql
    
    update #lynn_result
    set Size_MB=@fSize_MB,
    Rows=@fRows,
    dropscript=@dropsql, alterscript=@altersql,  addscript=@addsql
    where dbname=@fdb and tbname =@ftb;

    FETCH NEXT FROM lynn INTO @fdb ,@ftb,@fSize_MB,@fRows
  END  
CLOSE lynn      
DEALLOCATE lynn



DECLARE @engine varchar(2)
DECLARE @rebuild varchar(10)
SELECT @engine = CONVERT(varchar(2),SERVERPROPERTY('EngineEdition'))
IF @engine = 3
    SET @rebuild = 'ON'
ELSE
    SET @rebuild = 'OFF'


select 
DBName,TbName,Size_MB,Rows,inputcolumns,altercolumns,
alter_script=
'RAISERROR(''=====Processing table:'+tbname+','+cast(Size_MB as varchar(20))+ ' MB,'+CAST(Rows as varchar(20))+' Rows============'',10,1) WITH NOWAIT '
+char(10)+char(10)+'/***** drop *****/'+char(10)+'USE ['+DBName+']'
+char(10)+dropscript
+char(10)+char(10)+'/***** alter *****/'+char(10)+'USE ['+DBName+']'
+char(10)+alterscript
+char(10)+char(10)+'/***** add *****/'+char(10)+'USE ['+DBName+']'
+char(10)+addscript
+case when Size_MB*1.0/1024>1.0  then ' declare @ta datetime=getdate(),@tb varchar(20)'
    +char(10)+ 'ALTER INDEX ALL ON '+TbName+' REBUILD WITH(ONLINE='+@rebuild+')'
    +char(10)+'select @tb=cast( cast( DATEDIFF(second ,@ta,getdate())/60.0  as decimal(12,1) )  as varchar(20))'
    +char(10)+'RAISERROR(''Rebuild is done.    %s minutes'',10,1,@tb) WITH NOWAIT'
    else '' end
+char(10)+char(10)+'RAISERROR(''=====End Process table:'+tbname+'============'',10,1) WITH NOWAIT '

,dropscript,alterscript,addscript

from  #lynn_result
order by dbname 



IF OBJECT_ID('tempdb.dbo.#getsize') IS NOT NULL
    DROP TABLE #getsize
if OBJECT_ID('tempdb..#currenttype','U') is not null
    drop table #currenttype
IF OBJECT_ID('tempdb.dbo.#indexinfo') IS NOT NULL
    DROP TABLE #indexinfo
IF OBJECT_ID('tempdb.dbo.#dfinfo') IS NOT NULL
    DROP TABLE #dfinfo
IF OBJECT_ID('tempdb.dbo.#stinfo') IS NOT NULL
    DROP TABLE #stinfo
IF OBJECT_ID('tempdb.dbo.#ckinfo') IS NOT NULL
    DROP TABLE #ckinfo
IF OBJECT_ID('tempdb.dbo.#fullindexinfo') IS NOT NULL
    DROP TABLE #fullindexinfo
IF OBJECT_ID('tempdb.dbo.#lynn_tbinfo') IS NOT NULL
    DROP TABLE #lynn_tbinfo
IF OBJECT_ID('tempdb.dbo.#lynn_result') IS NOT NULL
    DROP TABLE #lynn_result