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Server: Msg 512, Level 16, State 1, Procedure trg_T1_i, Line 7 Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression. The statement has been terminated.

6 7 8 9

The error was generated because a subquery that was used where a scalar value was expected produced multiple values . Assuming that you re not allowed to alter the trigger s code, you can tackle the problem by creating an INSTEAD OF INSERT trigger . You can use the technique I showed earlier to iterate through the rows in inserted to collect the values from each row and issue a single row insert for each source row against the target table .

Each insert causes a different instance of the AFTER trigger to fire, but it fires for one row at a time . Run the following code to create such an INSTEAD OF trigger:

public class PDFWriter { protected Transformer transformer = null; public PDFWriter(StreamSource source) throws TransformerConfigurationException { TransformerFactory factory = TransformerFactory.newInstance(); transformer = factory.newTransformer(source); }

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CREATE TRIGGER trg_T1_ioi_perrow ON dbo.T1 INSTEAD OF INSERT AS DECLARE @rc AS INT = (SELECT COUNT(*) FROM (SELECT TOP (2) * FROM inserted) AS D); IF @rc = 0 RETURN; IF @rc = 1 INSERT INTO dbo.T1 SELECT * FROM inserted; ELSE BEGIN DECLARE @keycol AS INT, @datacol AS INT; DECLARE @Cinserted CURSOR; SET @Cinserted = CURSOR FAST_FORWARD FOR SELECT keycol, datacol FROM inserted; OPEN @Cinserted; FETCH NEXT FROM @Cinserted INTO @keycol, @datacol; WHILE @@fetch_status = 0 BEGIN INSERT INTO dbo.T1(keycol, datacol) VALUES(@keycol, @datacol); FETCH NEXT FROM @Cinserted INTO @keycol, @datacol; END END GO

The trigger s code uses the technique I described earlier to apply a course of action that depends on the number of affected rows, only this time using a cursor to iterate through the rows in inserted . If zero rows were affected, the trigger exits . If one row was affected, the trigger inserts the row from inserted into T1, causing the AFTER trigger to fire for that row . If multiple rows were affected, the trigger uses a cursor to iterate through the rows in inserted one at a time, collecting the values from the current row in each iteration, and it then inserts a row to T1 with those values . As a result, the AFTER trigger fires once for each row . To test the trigger, first issue the following INSERT statement, which inserts a single row to T1:

INSERT INTO dbo.T1(keycol, datacol) VALUES(5, 50);

You get the following output:

public PDFWriter(String xslFilePath) throws TransformerConfigurationException, FileNotFoundException { this(new StreamSource(new FileInputStream(xslFilePath))); }

Try inserting multiple rows using a single INSERT statement:

INSERT INTO dbo.T1(keycol, datacol) VALUES (6, 60), (7, 70), (8, 80);

The statement runs successfully, producing the following output:

protected byte[] invokeFOP(InputSource foSource) throws Exception { ByteArrayOutputStream out = new ByteArrayOutputStream(); Driver driver = new Driver(foSource, out); Defines a set of page driver.run(); templates containing return out.toByteArray(); a single page named } simple public byte[] generatePDF(StreamSource xmlSource) throws Exception { ByteArrayOutputStream baos = new ByteArrayOutputStream(); StreamResult foResult = new StreamResult(baos); transformer.transform(xmlSource, foResult); ByteArrayInputStream bais = new ByteArrayInputStream( baos.toByteArray() ); return invokeFOP( new InputSource(bais) ); } public static void createPDFFromXML(String xslFilePath, InputStream xmlIn, OutputStream pdfOut) throws Exception { PDFWriter writer = new PDFWriter(xslFilePath); byte[] PDFbytes = writer.generatePDF( new StreamSource(xmlIn) ); pdfOut.write(PDFbytes, 0, PDFbytes.length); } }

When you re done, run the following code for cleanup:

IF OBJECT_ID('dbo.T1', 'U') IS NOT NULL DROP TABLE dbo.T1;

In the Orientation Sequence Settings dialog box, tap the 2 arrow, and then tap Secondary Landscape. Tap the 3 arrow, and then tap Primary Portrait. To close the open dialog boxes and apply the new settings, double-tap OK. To test the new sequence, in the notification area, tap the Change tablet and pen settings icon, and then tap Change screen orientation. The screen orientation rotates 180 degrees.

The following example demonstrates how to use an INSTEAD OF TRIGGER to support UPDATE statements against a view that would have not been supported otherwise . Suppose that you have a table with order details and a view that aggregates order detail quantities per order . Run the following code to create the OrderDetails table, populate it with sample data, and create the OrderTotals view, which calculates the sum of the quantity for each order:

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