項目字段不夠用
，涉及的表太多，自己寫的土方法，大家有沒有更簡便的處理方法？
- SQL code
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/* ==================================================== */
-- Author: 黃光偉
-- Create date: 2010-06-03 21:00:02
-- Description: 批量修改字段長度，考慮待修改字段爲主鍵或者外鍵或者索引的情況 使用sp_helpindex列出索引信息
-- 版本 MSSQL2000
/* ==================================================== */
-- 參數信息
declare @colname varchar ( 50 ) -- 字段名稱
declare @length int -- 長度
declare @type varchar ( 20 ) -- 類型 --未考慮待完善
declare @addlen int -- 是否有長度 --未考慮待完善
-- 賦值
select @colname = ' mat_code ' ,
@length = 50
declare @tablename varchar ( 50 ), @sql varchar ( 8000 ), @exec varchar ( 8000 )
declare @pkname varchar ( 100 ) -- 主鍵名
declare @pkfieldname varchar ( 500 ) -- 主鍵字段名
declare @isnullable char ( 1 ) -- 是否爲空
declare @foreignkey varchar ( 100 ) -- 外鍵名
declare @foreignname varchar ( 500 ) -- 外鍵字段名
declare @displayname varchar ( 500 ) -- 外鍵對應字段名
declare @displaytable varchar ( 50 ) -- 外鍵對應表名
declare @display varchar ( 50 ) -- 外鍵對應字段
declare @isnull char ( 1 ) -- 外鍵對應字段是否爲空
-- 索引臨時表
create table # index (
index_name varchar ( 50 ),
index_declare varchar ( 500 ),
index_keys varchar ( 300 )
)
-- start
select t.name,r.isnullable into # temp from sysobjects t,syscolumns r
where t.id = r.id and t.xtype = ' U ' and
r.name = @colname -- and r.length = 20
declare cursor_temp cursor for
-- 含該字段的表
select * from # temp
open cursor_temp
fetch cursor_temp into @tablename , @isnullable
while @@fetch_status = 0
begin
begin tran
-- 初始化
select @pkfieldname = '' , @pkname = '' , @foreignkey = '' , @foreignname = '' ,
@displayname = '' , @displaytable = '' , @display = ''
-- 清空索引臨時表
truncate table # index
-- 插入索引信息
insert into # index
exec sp_helpindex @tablename
-- 判斷主鍵是否存在該字段
if exists ( select 1 from # index where charindex ( ' primary key ' ,index_declare) > 0 and
charindex ( ' , ' + @colname + ' , ' , ' , ' + replace ( rtrim ( ltrim (index_keys)), ' , ' , ' , ' ) + ' , ' ) > 0 )
begin
select @pkname = index_name, @pkfieldname = index_keys from # index
where charindex ( ' primary key ' ,index_declare) > 0 and
charindex ( ' , ' + @colname + ' , ' , ' , ' + replace ( rtrim ( ltrim (index_keys)), ' , ' , ' , ' ) + ' , ' ) > 0
-- 刪除主鍵
set @sql = ' alter table ' + @tablename + ' drop constraint ' + @pkname
print @sql + char ( 13 ) + char ( 10 ) + ' go '
exec ( @sql )
end
-- 重建主鍵另一方法
/*
-- 取得主鍵名
select @pkname = name from sysobjects where xtype = 'PK'
and parent_obj = object_id(@tablename,'U')
--判斷主鍵是否存在該字段
if exists(select 1 from sysindexkeys ,syscolumns,sysindexes
where sysindexkeys.colid = syscolumns.colid and
sysindexkeys.id = syscolumns.id and
sysindexkeys.indid = sysindexes.indid and
sysindexkeys.id = sysindexes.id and
sysindexes.name = @pkname and syscolumns.name = @colname)
begin
-- 主鍵字段
select @pkfieldname = @pkfieldname+syscolumns.name+',' from sysindexkeys ,syscolumns,sysindexes
where sysindexkeys.colid = syscolumns.colid and
sysindexkeys.id = syscolumns.id and
sysindexkeys.indid = sysindexes.indid and
sysindexkeys.id = sysindexes.id and
sysindexes.name = @pkname
-- 刪除舊主鍵
set @sql = 'alter table '+ @tablename + ' drop constraint ' + @pkname
print @sql+char(13)+char(10)+'go'
exec(@sql)
end
*/
-- 判斷索引是否存在該字段
if exists ( select 1 from # index where charindex ( ' primary key ' ,index_declare) = 0 and
charindex ( ' , ' + @colname + ' , ' , ' , ' + replace ( rtrim ( ltrim (index_keys)), ' , ' , ' , ' ) + ' , ' ) > 0 )
begin
select @sql = '' , @exec = ''
select @sql = @sql + char ( 13 ) + char ( 10 ) + ' drop index dbo. ' + @tablename + ' . ' + index_name + char ( 13 ) + char ( 10 )
from # index where charindex ( ' , ' + @colname + ' , ' , ' , ' + replace ( rtrim ( ltrim (index_keys)), ' , ' , ' , ' ) + ' , ' ) > 0 and
charindex ( ' primary key ' ,index_declare) = 0
-- 刪除索引
print @sql + ' go '
exec ( @sql )
-- 索引語法
/* create unique index [ix_pln_cost_limit] on [dbo].[pln_cost_limit]([task_no], [mat_code]) on [primary] */
select @exec = @exec + char ( 13 ) + char ( 10 ) + ' create ' +
case charindex ( ' unique ' ,index_declare) when 0 then ' index ' else ' unique index ' end +
index_name + ' on ' + @tablename + ' ( ' + replace (index_keys, ' (-) ' , ' desc ' ) + ' ) on [primary] ' + char ( 13 ) + char ( 10 )
from # index where charindex ( ' , ' + @colname + ' , ' , ' , ' + replace ( rtrim ( ltrim (index_keys)), ' , ' , ' , ' ) + ' , ' ) > 0 and
charindex ( ' primary key ' ,index_declare) = 0
end
-- 取得外鍵名
select @foreignkey = name from sysobjects where xtype = ' F '
and parent_obj = object_id ( @tablename , ' U ' )
select @displaytable = name from sysobjects where xtype = ' U ' and
id = ( select top 1 rkeyid from sysforeignkeys
where constid = object_id ( @foreignkey , ' F ' ))
-- 判斷外鍵是否存在該字段
if exists ( select 1 from sysforeignkeys t,syscolumns r,syscolumns f
where t.fkeyid = r.id and t.fkey = r.colid and
t.rkeyid = f.id and t.rkey = f.colid and
t.constid = object_id ( @foreignkey , ' F ' ) and r.name = @colname )
begin
-- 外鍵字段
select @foreignname = @foreignname + r.name + ' , ' , @displayname = @displayname + f.name + ' , '
from sysforeignkeys t,syscolumns r,syscolumns f
where t.fkeyid = r.id and t.fkey = r.colid and
t.rkeyid = f.id and t.rkey = f.colid and
t.constid = object_id ( @foreignkey , ' F ' )
-- 對應字段名
select @display = f.name from sysforeignkeys t,syscolumns r,syscolumns f
where t.fkeyid = r.id and t.fkey = r.colid and
t.rkeyid = f.id and t.rkey = f.colid and
t.constid = object_id ( @foreignkey , ' F ' ) and r.name = @colname
-- 刪除外鍵
set @sql = ' alter table ' + @tablename + ' drop constraint ' + @foreignkey
print @sql + char ( 13 ) + char ( 10 ) + ' go '
exec ( @sql )
end
-- 修改字段長度
select @sql = ' alter table ' + @tablename + ' alter column ' + @colname + ' varchar( ' +
rtrim ( @length ) + ' ) ' + case @isnullable when ' 1 ' then ' null ' else ' not null ' end
print @sql + char ( 13 ) + char ( 10 ) + ' go '
exec ( @sql )
-- 創建主鍵
if isnull ( @pkfieldname , '' ) <> ''
begin
set @sql = ' alter table ' + @tablename + ' add constraint ' + @pkname
+ ' primary key clustered( ' + @pkfieldname + ' ) on [primary] '
print @sql + char ( 13 ) + char ( 10 ) + ' go '
exec ( @sql )
end
-- 重建索引
if isnull ( @exec , '' ) <> ''
begin
print @exec + ' go '
exec ( @exec )
select @exec = ''
end
-- 創建外鍵
/*
創建語法
ALTER TABLE [dbo].[wrkshop_check] ADD CONSTRAINT [wrk_mat_code] FOREIGN KEY
(
[mat_code]
) REFERENCES [MAT_MASTER] (
[MAT_CODE]
)
*/
if @foreignname <> ''
begin
-- 構建外鍵字段長度需一致
-- 修改外鍵對應表的字段長度
-- 是否爲空
select @isnull = isnullable from syscolumns where id = object_id ( @displaytable , ' U ' ) and name = @display
-- 修改長度
select @sql = ' alter table ' + @displaytable + ' alter column ' + @display + ' varchar( ' +
rtrim ( @length ) + ' ) ' + case @isnull when ' 1 ' then ' null ' else ' not null ' end
print @sql + char ( 13 ) + char ( 10 ) + ' go '
exec ( @sql )
delete from # temp where name = @displaytable
-- 重建外鍵
select @foreignname = left ( @foreignname , len ( @foreignname ) - 1 ),
@displayname = left ( @displayname , len ( @displayname ) - 1 )
set @sql = ' alter table ' + @tablename + ' add constraint ' + @foreignkey
+ ' foreign key ( ' + @foreignname + ' ) REFERENCES '
+ @displaytable + ' ( ' + @displayname + ' ) '
print @sql + char ( 13 ) + char ( 10 ) + ' go '
exec ( @sql )
end
if @@error > 0
begin
rollback tran
close cursor_temp
deallocate cursor_temp
drop table # index
return
end
else
begin
print ' ----------------------------- '
commit tran
fetch next from cursor_temp into @tablename , @isnullable
end
end
close cursor_temp
deallocate cursor_temp
drop table # index ,# temp