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SELECT * FROM vwZips
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6 Create an error by trying to modify the data via the VIEW We can do this with the following script (This script will produce an error similar to Figure 6-13)
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Figure 6-13 An error from UPDATE into the distributed VIEW
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UPDATE vwZips SET State = 'VA' WHERE ZipCode = 44562
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7 To prevent the error, we ll create an INSTEAD OF trigger to update the correct underlying table The following script will create the trigger:
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CREATE TRIGGER trgUpdateVwZips ON vwZips INSTEAD OF UPDATE AS DECLARE @Zip int DECLARE @State char(2) --Get the zip and state from the inserted table Set @Zip = (SELECT ZipCode FROM inserted) Set @State = (SELECT State FROM inserted) If @Zip < 60000 --ZipCode is in the ZipState1To5 table UPDATE ZipState1To5 SET State = @State WHERE ZipCode = @Zip ELSE --ZipCode is in the ZipState6To9 table UPDATE ZipState6To9 SET State = @State WHERE ZipCode = @Zip
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Modify the data by using an UPDATE against the VIEW We ll first use a SELECT statement to see what the data is before the UPDATE, and then after the update use another SELECT statement After executing the following query, your display should look similar to Figure 6-14 Note that when the trigger fires the output is red This is normal
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Figure 6-14 A successful update of a distributed VIEW with an INSTEAD OF trigger
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6: Advanced Database Objects
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SELECT * FROM vwZips; UPDATE vwZips SET State = 'WI' WHERE ZipCode = 44562; SELECT * FROM vwZips
Using INSTEAD OF for Failed Imports
Another possible reason to use INSTEAD OF triggers is when data will be imported to a table, but you know that some of the data will not meet the constraint testing For example, let s say that you regularly import data received from several different business partners into a table named SalesLeads Your goal is to import the data into a table, but you find that the data often have typos or other inconsistencies that cause it to fail Some are as simple as the state abbreviation being misspelled, causing it to fail a referential integrity check with another table Others have a Boolean column randomly defined as True, T, Yes, Y, or 1, instead of one single definition Using the DML INSTEAD OF trigger, we can cause a different action to occur instead of the failed import The INSTEAD OF trigger would examine the data for each row before the INSERT If the data was acceptable, it would allow the INSERT If the data wasn t acceptable, it would instead insert the data into a temporary table In the following exercise, we ll create an INSTEAD OF DML trigger that moves data into a temporary table if it fails certain types of checks Imagine that the company you work for just discovered that many entries aren t getting added to the AuditAccess table because the INSERT statements are failing constraint checking You are tasked with creating an INSTEAD OF trigger to instead insert this data into a temporary table to be examined later Exercise 65: Create an INSTEAD OF DML Trigger to Record Errors 1 Create a New Query window in SSMS 2 If you didn t do the previous exercise, use the following script to create a table named State and then populate it with some data We ll use this as a lookup table to verify that a state exists
USE 6; GO CREATE TABLE dboState ( StateID char(2) NOT NULL, CONSTRAINT [PK_State_StateID] PRIMARY KEY CLUSTERED ( StateID ) ); GO --Populate the table INSERT INTO State VALUES('VA'); INSERT INTO State VALUES('CA'); INSERT INTO State VALUES('OK'); INSERT INTO State VALUES('WI');
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3 Next, we ll create a ZipState table (similar to what was created in a demonstration earlier in this chapter), and establish a relationship between the tables on the StateID columns After creating it, we ll populate it with some valid data CAUTION If you created the ZipState table while following along earlier in the chapter, you must first drop it using the DROP TABLE dboZipState command
CREATE TABLE dboZipState( ZipStateID int NOT NULL, ZipCode int NOT NULL, State char(2) NOT NULL, CONSTRAINT FK_State_State FOREIGN KEY(State) REFERENCES dboState(StateID), CONSTRAINT [PK_ZipState_ZipStateID] PRIMARY KEY CLUSTERED ( ZipStateID ) ); GO --Populate the table INSERT INTO ZipState (ZipStateID, ZipCode, State) VALUES(1,23462,'VA'); INSERT INTO ZipState (ZipStateID, ZipCode, State) VALUES(2,94562,'CA'); INSERT INTO ZipState (ZipStateID, ZipCode, State) VALUES(3, 74562,'OK'); INSERT INTO ZipState (ZipStateID, ZipCode, State) VALUES(4, 54562,'WI');
4 Simulate an error by trying to enter data with a state that doesn t exist (MM) in the referenced table The following line will produce an error similar to Figure 6-15:
INSERT INTO ZipState (ZipStateID, ZipCode, State) VALUES(5, 54562,'MM');
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