SQL Server/T-SQL/Trigger/INSTEAD OF Trigger — различия между версиями

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м (1 версия)
 
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Версия 13:46, 26 мая 2010

INSTEAD OF DELETE on a trigger

 
2>
3>
4>
5> CREATE TABLE Customers (
6>      CustomerID nchar (5) NOT NULL ,
7>      CompanyName nvarchar (40) NOT NULL ,
8>      ContactName nvarchar (30) NULL ,
9>      ContactTitle nvarchar (30) NULL ,
10>     Address nvarchar (60) NULL ,
11>     City nvarchar (15) NULL ,
12>     Region nvarchar (15) NULL ,
13>     PostalCode nvarchar (10) NULL ,
14>     Country nvarchar (15) NULL ,
15>     Phone nvarchar (24) NULL ,
16>     Fax nvarchar (24) NULL
17> )
18> GO
1>
2> INSERT Customers VALUES("1","A","Maria",    "Sales",  "Str. 57", "Berlin"    ,NULL,"12209", "Germany","111-1111111","111-1111111")
3> INSERT Customers VALUES("2","M","Joe",      "Owner",  "Ave. 231","Vancouver" ,NULL,"05023", "Mexico", "(222) 222-3332",NULL)
4> INSERT Customers VALUES("3","H","Thomas",   "Sales",  "Sq.  111","London"    ,NULL,"1D00P", "UK",     "(444) 444-4444","(444) 444-4444")
5> INSERT Customers VALUES("4","B","Berg",     "Order",  "Blv    8","Toronto"   ,NULL,"00222", "Sweden", "4444-55 55 65","5555-55 55 55")
6> INSERT Customers VALUES("5","S","Moos",     "Sales",  "Fort  57","New York"  ,NULL,"68306", "Germany","6666-66666","6666-77777")
7> INSERT Customers VALUES("6","F","Cite",     "Manager","24      ","Dalles"    ,NULL,"67000", "France", "88.60.15.31","88.60.15.32")
8> INSERT Customers VALUES("7","C","Sommer",   "Owner",  "Araq, 67","Paris"     ,NULL,"28023", "Spain",  "(91) 555 22 82","(91) 555 91 99")
9> INSERT Customers VALUES("8","P","Leb",      "Owner",  "12      ","Beijing"   ,NULL,"13008", "France", "91.24.45.40","91.24.45.41")
10> INSERT Customers VALUES("9","D","Elizabeth","Manager","23 Blvd.","Tsawassen","BC", "T2F8M4","Canada", "(604) 555-4729","(604) 555-3745")
11> go
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2>    CREATE VIEW CustomerOrders_vw
3>    WITH SCHEMABINDING
4>    AS
5>    SELECT   cu.rupanyName
6>    FROM     dbo.Customers  AS cu
7>    GO
1>
2>
3>
4>    CREATE TRIGGER trCustomerOrderUpdate ON CustomerOrders_vw
5>    INSTEAD OF DELETE
6>    AS
7>    BEGIN
8>        IF (SELECT COUNT(*) FROM Inserted) > 0
9>        BEGIN
10>            RAISERROR("No matching Orders. Cannot perform insert",10,1)
11>        END
12>    END
13> GO
1> drop TRIGGER trCustomerOrderUpdate;
2> drop view CustomerOrders_vw;
3> drop table Customers;
4> GO



INSTEAD OF INSERT on a trigger

 

2>
3> CREATE TABLE Customers (
4>      CustomerID nchar (5) NOT NULL ,
5>      CompanyName nvarchar (40) NOT NULL ,
6>      ContactName nvarchar (30) NULL ,
7>      ContactTitle nvarchar (30) NULL ,
8>      Address nvarchar (60) NULL ,
9>      City nvarchar (15) NULL ,
10>     Region nvarchar (15) NULL ,
11>     PostalCode nvarchar (10) NULL ,
12>     Country nvarchar (15) NULL ,
13>     Phone nvarchar (24) NULL ,
14>     Fax nvarchar (24) NULL
15> )
16> GO
1>
2> INSERT Customers VALUES("1","A","Maria",    "Sales",  "Str. 57", "Berlin"    ,NULL,"12209", "Germany","111-1111111","111-1111111")
3> INSERT Customers VALUES("2","M","Joe",      "Owner",  "Ave. 231","Vancouver" ,NULL,"05023", "Mexico", "(222) 222-3332",NULL)
4> INSERT Customers VALUES("3","H","Thomas",   "Sales",  "Sq.  111","London"    ,NULL,"1D00P", "UK",     "(444) 444-4444","(444) 444-4444")
5> INSERT Customers VALUES("4","B","Berg",     "Order",  "Blv    8","Toronto"   ,NULL,"00222", "Sweden", "4444-55 55 65","5555-55 55 55")
6> INSERT Customers VALUES("5","S","Moos",     "Sales",  "Fort  57","New York"  ,NULL,"68306", "Germany","6666-66666","6666-77777")
7> INSERT Customers VALUES("6","F","Cite",     "Manager","24      ","Dalles"    ,NULL,"67000", "France", "88.60.15.31","88.60.15.32")
8> INSERT Customers VALUES("7","C","Sommer",   "Owner",  "Araq, 67","Paris"     ,NULL,"28023", "Spain",  "(91) 555 22 82","(91) 555 91 99")
9> INSERT Customers VALUES("8","P","Leb",      "Owner",  "12      ","Beijing"   ,NULL,"13008", "France", "91.24.45.40","91.24.45.41")
10> INSERT Customers VALUES("9","D","Elizabeth","Manager","23 Blvd.","Tsawassen","BC", "T2F8M4","Canada", "(604) 555-4729","(604) 555-3745")
11> go
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2>    CREATE VIEW CustomerOrders_vw
3>    WITH SCHEMABINDING
4>    AS
5>    SELECT   cu.rupanyName
6>    FROM     dbo.Customers  AS cu
7>    GO
1>
2>
3>    CREATE TRIGGER trCustomerOrderInsert ON CustomerOrders_vw
4>    INSTEAD OF INSERT
5>    AS
6>    BEGIN
7>       IF (SELECT COUNT(*) FROM Inserted) > 0
8>       BEGIN
9>               RAISERROR("No matching Orders. Cannot perform insert",10,1)
10>       END
11>    END
12>    GO
1>
2>    drop view CustomerOrders_vw;
3>    GO



INSTEAD OF UPDATE Triggers

 

4>
5>
6>
7> CREATE TABLE Customers (
8>      CustomerID nchar (5) NOT NULL ,
9>      CompanyName nvarchar (40) NOT NULL ,
10>     ContactName nvarchar (30) NULL ,
11>     ContactTitle nvarchar (30) NULL ,
12>     Address nvarchar (60) NULL ,
13>     City nvarchar (15) NULL ,
14>     Region nvarchar (15) NULL ,
15>     PostalCode nvarchar (10) NULL ,
16>     Country nvarchar (15) NULL ,
17>     Phone nvarchar (24) NULL ,
18>     Fax nvarchar (24) NULL
19> )
20> GO
1>
2> INSERT Customers VALUES("1","A","Maria",    "Sales",  "Str. 57", "Berlin"    ,NULL,"12209", "Germany","111-1111111","111-1111111")
3> INSERT Customers VALUES("2","M","Joe",      "Owner",  "Ave. 231","Vancouver" ,NULL,"05023", "Mexico", "(222) 222-3332",NULL)
4> INSERT Customers VALUES("3","H","Thomas",   "Sales",  "Sq.  111","London"    ,NULL,"1D00P", "UK",     "(444) 444-4444","(444) 444-4444")
5> INSERT Customers VALUES("4","B","Berg",     "Order",  "Blv    8","Toronto"   ,NULL,"00222", "Sweden", "4444-55 55 65","5555-55 55 55")
6> INSERT Customers VALUES("5","S","Moos",     "Sales",  "Fort  57","New York"  ,NULL,"68306", "Germany","6666-66666","6666-77777")
7> INSERT Customers VALUES("6","F","Cite",     "Manager","24      ","Dalles"    ,NULL,"67000", "France", "88.60.15.31","88.60.15.32")
8> INSERT Customers VALUES("7","C","Sommer",   "Owner",  "Araq, 67","Paris"     ,NULL,"28023", "Spain",  "(91) 555 22 82","(91) 555 91 99")
9> INSERT Customers VALUES("8","P","Leb",      "Owner",  "12      ","Beijing"   ,NULL,"13008", "France", "91.24.45.40","91.24.45.41")
10> INSERT Customers VALUES("9","D","Elizabeth","Manager","23 Blvd.","Tsawassen","BC", "T2F8M4","Canada", "(604) 555-4729","(604) 555-3745")
11> go
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2>    CREATE VIEW CustomerOrders_vw
3>    WITH SCHEMABINDING
4>    AS
5>    SELECT   cu.rupanyName
6>    FROM     dbo.Customers  AS cu
7>    GO
1>
2>
3>
4>    CREATE TRIGGER trCustomerOrderUpdate ON CustomerOrders_vw
5>    INSTEAD OF UPDATE
6>    AS
7>    BEGIN
8>        IF (SELECT COUNT(*) FROM Inserted) > 0
9>        BEGIN
10>            RAISERROR("No matching Orders. Cannot perform insert",10,1)
11>        END
12>    END
13> GO
1> drop TRIGGER trCustomerOrderUpdate;
2> drop view CustomerOrders_vw;
3> drop table Customers;
4> GO