只有當它存在於sybase中時，我如何刪除任何約束？

我可以刪除表，過程，視圖，如果它存在使用下面的代碼，但不知道怎麼做同樣的一個約束（外鍵，檢查約束）：只有當它存在於sybase中時，我如何刪除任何約束？

IF EXISTS (SELECT 1 FROM sysobjects WHERE user = 'owner' and name = 'tablename' AND type = 'U')DROP TABLE owner.tablename 
go

我曾嘗試用以下代碼 -

- alter table dbname.owner.tablename drop constraint Fk_name FOREIGN 
     KEY (References-colname) 

    - if exists (select 1 from syscolumns 
       where id = object_id("some_table") 
        and name = "some_column") 
       begin 
        alter table some_table drop some_column 
       end 


    - IF EXISTS (SELECT * FROM sysobjects WHERE user = 'owner' and name = 'FK_name' AND type = 'RI') 
ALTER TABLE owner.tablename DROP CONSTRAINT [owner.Fk_name] 
GO

這裏是ddlgen將命令生成我DDL -

DROP TABLE fin_code2 
go 
DROP TABLE Student1 
go 
DROP TABLE SalesOrders 
go 
DROP TABLE DEPT 
go 
DROP TABLE library_books 
go 
DROP TABLE brand 
go 
DROP TABLE EMPLOYEE 
go 
DROP TABLE DEPT_test 
go 
DROP TABLE EMPLOYEE 
go 
DROP TABLE EMPLOYEE24 
go 
DROP TRIGGER reminder 
go 
DROP VIEW sysquerymetrics 
go 
DROP VIEW emp_dept 
go 
DROP VIEW empview 
go 
DROP PROCEDURE showdept 
go 
USE master 
go 


PRINT "<<<< CREATE DATABASE geetextract>>>>" 
go 


IF EXISTS (SELECT 1 FROM master.dbo.sysdatabases 
     WHERE name = 'geetextract') 
    DROP DATABASE geetextract 
go 


IF (@@error != 0) 
BEGIN 
    PRINT "Error dropping database 'geetextract'" 
    SELECT syb_quit() 
END 
go 


CREATE DATABASE geetextract 
     ON master = '6M' -- 1536 pages 
    WITH DURABILITY = FULL 
     , DML_LOGGING = FULL 
go 


ALTER DATABASE geetextract 
     ON master = '10240M' -- 2621440 pages 
go 


use geetextract 
go 

exec sp_changedbowner 'sa', true 
go 

exec master.dbo.sp_dboption geetextract, 'ddl in tran', true 
go 

checkpoint 
go 


----------------------------------------------------------------------------- 
-- DDL for User 'geetanjali' 
----------------------------------------------------------------------------- 

print '<<<<< CREATING User - "geetanjali" >>>>>' 
go 

exec sp_adduser 'geetanjali' ,'geetanjali' ,'public' 
go 


----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.geetanjali.DEPT' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.geetanjali.DEPT" >>>>>' 
go 

use geetextract 
go 

setuser 'geetanjali' 
go 

create table DEPT (
    DeptNo       int        not null, 
    DeptName      varchar(20)      not null, 
    Mgr        int        not null, 
PRIMARY KEY CLUSTERED (DeptNo) on 'default' 
) 
lock allpages 
with dml_logging = full 
on 'default' 
go 


setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Index 'DeptNoind' 
----------------------------------------------------------------------------- 

print '<<<<< CREATING Index - "DeptNoind" >>>>>' 
go 

create nonclustered index DeptNoind 
on geetextract.geetanjali.DEPT(DeptNo) 
go 


----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.dbo.DEPT_test' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.dbo.DEPT_test" >>>>>' 
go 

setuser 'dbo' 
go 

create table DEPT_test (
    DeptNo       int        not null, 
    DeptName      varchar(20)      not null, 
    Mgr        int        not null 
) 
lock allpages 
with dml_logging = full 
on 'default' 
go 


setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.geetanjali.EMPLOYEE' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.geetanjali.EMPLOYEE" >>>>>' 
go 

setuser 'geetanjali' 
go 

set quoted_identifier on 
go 

create table EMPLOYEE (
    EmpNo       int        not null, 
    DeptNo       int        not null, 
    LastName      varchar(20)      not null, 
    FirstName      varchar(20)      not null, 
    Salary       int        not null, 
    Description      text         null, 
PRIMARY KEY CLUSTERED (EmpNo) on 'default', 
CONSTRAINT valid_check CHECK  (Salary > 10000)) 
lock allpages 
with dml_logging = full 
on 'default' 
go 

sp_placeobject 'default', 'geetanjali.EMPLOYEE.tEMPLOYEE' 
go 


setuser 
go 
set quoted_identifier off 
go 


----------------------------------------------------------------------------- 
-- DDL for Trigger 'geetextract.geetanjali.reminder' 
----------------------------------------------------------------------------- 

print '<<<<< CREATING Trigger - "geetextract.geetanjali.reminder" >>>>>' 
go 

setuser 'geetanjali' 
go 

create trigger geetanjali.reminder on geetanjali.EMPLOYEE for insert, update as print "Don't forget to print a report for accounting." 
go 

setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.dbo.EMPLOYEE' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.dbo.EMPLOYEE" >>>>>' 
go 

setuser 'dbo' 
go 

create table EMPLOYEE (
    EmpNo       int        not null, 
    DeptNo       int        not null, 
    LastName      varchar(20)      not null, 
    FirstName      varchar(20)      not null, 
    Salary       int        not null, 
    Description      text         null, 
CONSTRAINT valid_check CHECK  (Salary > 10000)) 
lock allpages 
with dml_logging = full 
on 'default' 
go 

sp_placeobject 'default', 'dbo.EMPLOYEE.tEMPLOYEE' 
go 


setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.dbo.EMPLOYEE24' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.dbo.EMPLOYEE24" >>>>>' 
go 

setuser 'dbo' 
go 

create table EMPLOYEE24 (
    EmpNo       int        not null, 
    DeptNo       int        not null, 
    LastName      varchar(20)      not null, 
    FirstName      varchar(20)      not null, 
    Salary       int        not null, 
    Description      text         null, 
CONSTRAINT valid_check23 CHECK  (Salary > 10000)) 
lock allpages 
with dml_logging = full 
on 'default' 
go 

sp_placeobject 'default', 'dbo.EMPLOYEE24.tEMPLOYEE24' 
go 


setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.geetanjali.SalesOrders' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.geetanjali.SalesOrders" >>>>>' 
go 

setuser 'geetanjali' 
go 

create table SalesOrders (
    FinancialCode     char(2)       not null, 
    CustomerID      int        not null, 
    History       char(100)      not null, 
    OrderDate      date        not null, 
    ID        bigint       not null, 
PRIMARY KEY CLUSTERED (ID) on 'default' 
) 
lock allpages 
with dml_logging = full 
on 'default' 
go 


setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.geetanjali.Student1' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.geetanjali.Student1" >>>>>' 
go 

setuser 'geetanjali' 
go 

set quoted_identifier on 
go 

create table Student1 (
    StudentId      int        not null, 
    Name       char(100)      not null, 
    Class       char(50)       not null, 
    School       char(100)      not null, 
PRIMARY KEY CLUSTERED (StudentId) on 'default', 
UNIQUE NONCLUSTERED (StudentId, Name) on 'default', 
CONSTRAINT test_const CHECK  (StudentId > 0)) 
lock allpages 
with dml_logging = full 
on 'default' 
go 


setuser 
go 
set quoted_identifier off 
go 


----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.geetanjali.brand' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.geetanjali.brand" >>>>>' 
go 

setuser 'geetanjali' 
go 

set quoted_identifier on 
go 

create table brand (
    code       char(8)       not null, 
    valid       int        not null, 
    rowid       numeric(10,0)     not null, 
     CONSTRAINT brand_pk PRIMARY KEY CLUSTERED (code) on 'default', 
     CONSTRAINT brand_is_valid UNIQUE NONCLUSTERED (code, valid) on 'default', 
CONSTRAINT valid_check1 CHECK  (valid IN (0,1))) 
lock allpages 
with dml_logging = full 
on 'default' 
go 


setuser 
go 
set quoted_identifier off 
go 


----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.geetanjali.fin_code2' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.geetanjali.fin_code2" >>>>>' 
go 

setuser 'geetanjali' 
go 

create table fin_code2 (
    code       int        not null, 
    type       char(10)       not null, 
    description      char(235)      not null, 
    id        bigint       not null, 
UNIQUE NONCLUSTERED (code) on 'default' 
) 
lock allpages 
with dml_logging = full 
on 'default' 
go 


setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Table 'geetextract.geetanjali.library_books' 
----------------------------------------------------------------------------- 
print '<<<<< CREATING Table - "geetextract.geetanjali.library_books" >>>>>' 
go 

setuser 'geetanjali' 
go 

create table library_books (
    isbn       char(20)       not null, 
    copyright_date     date        not null, 
    title       char(100)      not null, 
    author       char(50)       not null, 
PRIMARY KEY CLUSTERED (isbn) on 'default' 
) 
lock allpages 
with dml_logging = full 
on 'default' 
go 


setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Index 'au_id_ind' 
----------------------------------------------------------------------------- 

print '<<<<< CREATING Index - "au_id_ind" >>>>>' 
go 

create nonclustered index au_id_ind 
on geetextract.geetanjali.library_books(isbn) 
go 


----------------------------------------------------------------------------- 
-- DDL for View 'geetextract.geetanjali.emp_dept' 
----------------------------------------------------------------------------- 

print '<<<<< CREATING View - "geetextract.geetanjali.emp_dept" >>>>>' 
go 

setuser 'geetanjali' 
go 

set quoted_identifier on 
go 

create view emp_dept AS SELECT EmpNo, DEPT.DeptNo FROM EMPLOYEE JOIN DEPT ON EMPLOYEE.DeptNo = DEPT.DeptNo 
go 

set quoted_identifier off 
go 

setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for View 'geetextract.geetanjali.empview' 
----------------------------------------------------------------------------- 

print '<<<<< CREATING View - "geetextract.geetanjali.empview" >>>>>' 
go 

setuser 'geetanjali' 
go 

set quoted_identifier on 
go 

create view empview (FirstName) as select distinct FirstName from EMPLOYEE 
go 

set quoted_identifier off 
go 

setuser 
go 

----------------------------------------------------------------------------- 
-- DDL for Stored Procedure 'geetextract.geetanjali.showdept' 
----------------------------------------------------------------------------- 

print '<<<<< CREATING Stored Procedure - "geetextract.geetanjali.showdept" >>>>>' 
go 

setuser 'geetanjali' 
go 

set quoted_identifier on 
go 

CREATE PROCEDURE showdept @deptname varchar(30) AS SELECT EMPLOYEE.EmpNo FROM EMPLOYEE, DEPT WHERE DEPT.DeptNo = EMPLOYEE.DeptNo 
go 


sp_procxmode 'showdept', unchained 
go 

set quoted_identifier off 
go 

setuser 
go 

----------------------------------------------------------------------------- 
-- Dependent DDL for Object(s) 
----------------------------------------------------------------------------- 
use geetextract 
go 

sp_addthreshold geetextract, 'logsegment', 24, sp_thresholdaction 
go 

Grant Select on dbo.sysobjects(name,id,uid,type,userstat,sysstat,indexdel,schemacnt,sysstat2,crdate,expdate,deltrig,instrig,updtrig,seltrig,ckfirst,cache,objspare,versionts,loginame,identburnmax,spacestate,erlchgts,sysstat3) to public 
go 
Grant Select on dbo.sysindexes to public 
go 
Grant Select on dbo.syscolumns to public 
go 
Grant Select on dbo.systypes to public 
go 
Grant Select on dbo.sysprocedures to public 
go 
Grant Select on dbo.syscomments to public 
go 
Grant Select on dbo.syssegments to public 
go 
Grant Select on dbo.syslogs to public 
go 
Grant Select on dbo.sysprotects to public 
go 
Grant Select on dbo.sysusers to public 
go 
Grant Select on dbo.sysalternates to public 
go 
Grant Select on dbo.sysdepends to public 
go 
Grant Select on dbo.syskeys to public 
go 
Grant Select on dbo.sysusermessages to public 
go 
Grant Select on dbo.sysreferences to public 
go 
Grant Select on dbo.sysconstraints to public 
go 
Grant Select on dbo.systhresholds to public 
go 
Grant Select on dbo.sysroles to public 
go 
Grant Select on dbo.sysattributes to public 
go 
Grant Select on dbo.sysslices to public 
go 
Grant Select on dbo.systabstats to public 
go 
Grant Select on dbo.sysstatistics to public 
go 
Grant Select on dbo.sysxtypes to public 
go 
Grant Select on dbo.sysjars to public 
go 
Grant Select on dbo.sysqueryplans to public 
go 
Grant Select on dbo.syspartitions to public 
go 
Grant Select on dbo.syspartitionkeys to public 
go 
alter table geetextract.geetanjali.EMPLOYEE 
add constraint EMPLOYEE_DeptNo_896003192 FOREIGN KEY (DeptNo) REFERENCES geetextract.geetanjali.DEPT(DeptNo) 
go 

alter table geetextract.geetanjali.fin_code2 
add constraint fin_code2_id_800002850 FOREIGN KEY (id) REFERENCES geetextract.geetanjali.SalesOrders(ID) 
go 

alter table geetextract.geetanjali.EMPLOYEE drop constraint EMPLOYEE_DeptNo_896003192 FOREIGN KEY (DeptNo) 
go 
alter table geetextract.geetanjali.fin_code2 drop constraint fin_code2_id_800002850 FOREIGN KEY (id) 
go 
alter table geetextract.geetanjali.EMPLOYEE add CONSTRAINT valid_check CHECK  (Salary > 10000) 
go 
alter table geetextract.geetanjali.EMPLOYEE drop constraint valid_check 
go 
alter table geetextract.geetanjali.Student1 add CONSTRAINT test_const CHECK  (StudentId > 0) 
go 
alter table geetextract.geetanjali.Student1 drop constraint test_const 
go 
alter table geetextract.geetanjali.brand add CONSTRAINT valid_check1 CHECK  (valid IN (0,1)) 
go 
alter table geetextract.geetanjali.brand drop constraint valid_check1 
go 
alter table geetanjali.EMPLOYEE DISABLE TRIGGER geetanjali.reminder 
go 
alter table geetanjali.EMPLOYEE ENABLE TRIGGER geetanjali.reminder 
go

它會執行但不會丟棄該密鑰。

來源

2016-02-19 Geetanjali

您需要查詢sysconstraints表以確定是否存在約束。

來源

2016-02-21 10:24:56 RobV

它不工作我已經嘗試用syscolumns而不是sysobjects。 – Geetanjali

你需要運行「是否存在」檢查sysconstraints中，下面的例子

IF EXISTS（SELECT * FROM sysconstraints中WHERE constrid = OBJECT_ID（ 'EMPLOYEE_FK'）和TABLEID = OBJECT_ID（ '測試'）） ALTER TABLE test.EMPLOYEE DROP CONSTRAINT [test.EMPLOYEE_FK]

當然，你也可以加入系統對象和sysconstraints中以CHCK對象的所有者。關於外鍵你也可以使用sysreferences

我在提出意見後對此答案進行了細化。

來源

2016-02-22 10:54:16 Kimon

我已經嘗試了以上解決方案 - 但它不工作，如果我嘗試我有執行查詢 - SELECT * FROM sysconstraints WHERE constrid = object_id（'test.EMPLOYEE_FK'） - 它將返回一行，但如果我從此查詢中刪除測試那麼結果將是0.然後我會執行 - 如果EXISTS（選擇*從sysconstraints WHERE constrid = object_id（'test.EMPLOYEE_FK'））ALTER TABLE test.EMPLOYEE DROP CONSTRAINT [test.EMPLOYEE_FK] GO - 它會提示一個錯誤 - 不能刪除約束，因爲它不存在於系統目錄中。所以你可以請建議我怎樣才能與特定的所有者執行。 – Geetanjali

你是對的，試試這個IF EXISTS（SELECT * FROM sysconstraints WHERE constrid = object_id（'test.EMPLOYEE_FK'）and tableid = object_id（'test'））ALTER TABLE test.EMPLOYEE DROP CONSTRAINT [test.EMPLOYEE_FK] GO你需要檢查表名和約束名 – Kimon

這也不起作用，我也只檢查這個查詢來獲得輸出SELECT * FROM sysconstraints WHERE constrid = object_id（'test.EMPLOYEE_FK'）和tableid = object_id（'test'）但是那裏沒有結果。同樣在查詢上方，但如果select子句中沒有行，它將不會刪除任何fk。 – Geetanjali

只有當它存在於sybase中時，我如何刪除任何約束？

回答

相關問題