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Chapter 4. Developing applications with ESQL 
77
Figure 4-25   The icon on the Dequeue button on the toolbar
2. In the Queue Manager Name field, type WBRK6_DEFAULT_QUEUE_MANAGER, and 
in the Queue Name field type ESQL_SIMPLE_OUT (Figure 4-26). The Dequeue 
Message wizard is case-sensitive.
3. Click Read From Queue.
If the message was processed correctly, the content of the output message is 
displayed in the wizard, as shown in Figure 4-26.
Figure 4-26   Getting the output message from ESQL_SIMPLE_OUT
If you receive the following Dequeue error message, the ESQL_Simple message 
flow has not put an output message on to the ESQL_SIMPLE_OUT queue:
BIP0917E No messages found to dequeue
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78
WebSphere Message Broker Basics
4.2.5  Diagnosing problems with the ESQL_Simple message flow
If the Dequeue wizard cannot get a message from the ESQL_SIMPLE_OUT 
queue, check first that you have entered the correct details in the enqueue file 
and in the Dequeue wizard. If all the details are correct, perform the following 
checks to diagnose the problem:
1. Open WebSphere MQ Explorer and check the Current queue depth column 
for the ESQL_SIMPLE_IN, ESQL_SIMPLE_OUT, and DLQ queues. The 
Current queue depth column displays the number of messages currently on 
each queue (Figure 4-27).
Figure 4-27   Checking the queues for messages
2. If the message is still on the ESQL_SIMPLE_IN queue, the message flow 
failed to get the message from the queue. Reasons for this might be:
– The wrong queue name is specified in the MQInput node properties. If so, 
fix the problem, add the message flow to the bar file again (the bar file 
does not dynamically update itself), then re-deploy the bar file to the 
broker.
– The message flow is not running. If so, in the Domains view of the Broker 
Administration perspective, right-click the message flow then click Start.
– The name of the backout requeue queue, DLQ, was incorrectly entered in 
the properties of the ESQL_SIMPLE_IN queue and a previous input 
message was rolled back by the message flow to the ESQL_SIMPLE_IN 
queue. Because the message flow cannot process the previous message, 
it is now blocking subsequent input messages from being processed by 
the message flow. If so, edit the queue’s properties so that the Backout 
requeue queue is DLQ, as described earlier in this chapter.
Use the Dequeue Message wizard to get the message from the 
ESQL_SIMPLE_IN queue so that the there are no messages on the 
ESQL_SIMPLE_IN queue, otherwise subsequent input messages will be 
blocked by the existing messages on the queue.
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Chapter 4. Developing applications with ESQL 
79
3. If the message is on the DLQ queue, the message flow was not able to 
process the message and so rolled the message back through the message 
flow to the ESQL_SIMPLE_IN queue. The message was then moved to the 
DLQ queue. Reasons for this happening might be:
– The XML in the input message is badly formed; for example, one of the 
tags is missing or is misspelled.
– There is a problem with the ESQL in the Compute node so it cannot 
process the message.
4. In WebSphere MQ Explorer, verify that the following objects are running:
– WBRK6_DEFAULT_QUEUE_MANAGER queue manager. To start the 
queue manager, right-click the queue manager, then click Start.
– WBRK6_DEFAULT_QUEUE_MANAGER listener. To start the listener, 
right-click the listener, then click Start.
– The WBRK6_DEFAULT_QUEUE_MANAGER queue manager’s 
command server. To start the command server, right-click the queue 
manager, then click Start Command Server.
5. In the ESQL_Simple message flow, make sure that the queue names in the 
MQInput and MQOutput nodes are spelled correctly and are in the correct 
case.
If none of these suggestions solve the problem, see Chapter8, 
“Troubleshooting and problem determination” on page 241, for more 
information about things to check.
4.3  Developing the Bookstore scenario using ESQL
In 4.2, “Developing the Simple message flow application” on page 52, you 
created the Simple scenario message flow application using ESQL to define the 
logic of the message flow.
In this section, we create a more complex message flow application that is based 
around the scenario of an online bookstore. The Bookstore scenario message 
flows process messages with different structures, and interact with databases to 
update database tables.
The Bookstore scenario includes two message flows:
 The ESQL_Create_Customer_Account message flow
This message flow uses ESQL in a Database node to create accounts in a 
DB2 database table for new customers who have registered their details with 
the bookstore, for example, their contact details and delivery address.
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80
WebSphere Message Broker Basics
 The ESQL_Book_Order message flow
This message flow uses ESQL in a Compute node to process an order that 
has been submitted by an online customer and create a response message to 
confirm the order with a unique order number.
4.3.1  Creating the Bookstore scenario database
The Bookstore scenario database, BSTOREDB, is a DB2 database that contains 
some tables of sample data. The ESQL_Create_Customer_Account message 
flow inserts data (a customer’s registration details) into a table in the BSTOREDB 
database.
In the Web material described in Appendix B, “Code” on page 319, there is an 
SQL script, BookStoreDB.sql, that you can run to create the BSTOREDB 
database.
To create the BSTOREDB database, tables, and sample data:
1. Start a DB2 Command Window: Start → Programs → IBM DB2 → 
Command Line Tools → Command Window.
2. In the Command Window, make sure that DB2 is running by entering the 
following command:
db2start
3. Change to the directory that contains the BookStoreDB.sql script, for 
example, if the BookStoreDB.sql file is in C:\Temp:
cd C:\Temp
4. Run the script:
db2 -vf BookStoreDB.sql
The script drops any tables that already exist of the same name, then creates 
and populates new ones.
4.3.2  Creating the ESQL_Create_Customer_Account message flow
The input message to the ESQL_Create_Customer_Account message flow 
contains the details of a customer who has registered with the online bookstore 
Web site. The customer has provided information such as their name, contact 
details, a delivery address, and payment details. Example 4-3 shows the input 
message for the ESQL_Create_Customer_Account message flow.
Example 4-3   The message for the ESQL_Create_Customer_Account message flow
<Create_Customer_Account_MSG>
<Personal_Details>
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Chapter 4. Developing applications with ESQL 
81
<First_Name>Peter</First_Name>
<Last_Name>Smith</Last_Name>
<User_ID>PSmith</User_ID>
<Password>p45sw0rd</Password>
</Personal_Details>
<Email_Address>Peter.Smith@nowhere.com</Email_Address>
<Daytime_Telephone>1234567890</Daytime_Telephone>
<Evening_Telephone>1234567890</Evening_Telephone>
<Shipping_Address>
<Address_1>19 Green Street</Address_1>
<Address_2>Littleton</Address_2>
<Town>Southington</Town>
<Postcode>SU29 8YT</Postcode>
</Shipping_Address>
<Billing_Address>
<Address_1>19 Green Street</Address_1>
<Address_2>Littleton</Address_2>
<Town>Southington</Town>
<Postcode>SU29 8YT</Postcode>
</Billing_Address>
<Payment_Details>
<Card>VISA</Card>
<Card_Number>1234567890</Card_Number>
<Expiry_Date>31.12.2009</Expiry_Date>
<Issue_Date>31.12.2004</Issue_Date>
<Issue_Number>02</Issue_Number>
<Security_Code>333</Security_Code>
</Payment_Details>
</Create_Customer_Account_MSG>
All of the ESQL that you need for this message flow is available in the Web 
material described in Appendix B, “Code” on page 319.
Figure 4-28 shows the finished ESQL_Create_Customer_Account message 
flow.
Figure 4-28   The ESQL_Create_Customer_Account message flow
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82
WebSphere Message Broker Basics
To create the ESQL_Create_Customer_Account message flow:
1. In the Broker Application Development perspective, create a Message Flow 
project called ESQL_Bookstore Message Flow Project.
2. Create a message flow called ESQL_Create_Customer_Account in the 
ESQL_Bookstore Message Flow Project. The 
ESQL_Create_Customer_Account.msgflow file opens in the Message Flow 
editor.
3. In the Message Flow editor, add the nodes listed in Table 4-4 to the canvas, 
then connect the nodes together, as shown in Table 4-5, to build the 
ESQL_Create_Customer_Account message flow (Figure 4-28 on page 81).
Table 4-4   The ESQL_Create_Customer_Account message flow nodes
Table 4-5   Node connections in the ESQL_Create_Customer_Account message flow
4. Set the properties of the nodes, as shown in Table 4-6.
Table 4-6   Node properties for the ESQL_Create_Customer_Account message flow
Node type
Node name
MQInput
ESQL_BOOKSTORE_CCA_IN
Database
Database
MQOutput
ESQL_BOOKSTORE_CCA_OUT
Node name
Terminal
Connect to this node
ESQL_BOOKSTORE_CC
A_IN
Out
Database
Database
Out
ESQL_BOOKSTORE_CC
A_OUT
Node name
Page
Property
Value
ESQL_BOOKSTO
RE_CCA_IN
Basic
Queue Name
ESQL_BOOKSTO
RE_CCA_IN
Default
Message Domain
XML
Database
Basic
Data Source
BSTOREDB
ESQL_BOOKSTO
RE_CCA_OUT
Basic
Queue Name
ESQL_BOOKSTO
RE_CCA_OUT
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Chapter 4. Developing applications with ESQL 
83
5. In the Message Flow editor, right-click the Database node, then click Open 
ESQL to create the ESQL module that is referenced in the Database node 
Properties dialog. The ESQL_Create_Customer_Account.esql file opens in 
the ESQL editor.
6. In the ESQL editor, edit the ESQL_Create_Customer_Account.esql file. The 
ESQL selects content from the input message and inserts it into the 
CUSTACCTB table in the BSTOREDB database:
a. Use SQL (INSERT INTO Database) to update the database table 
CUSTACCTB with information from the message. Each field in the 
database table (for example, LAST_NAME, FIRST_NAME, USERID) is 
listed in the order in which it occurs in the database.
Example 4-4   Using SQL to update the CUSTACCTB database table
INSERT INTO Database.CUSTACCTB(LAST_NAME, FIRST_NAME, USERID, PASSWORD, 
EMAIL, DAY_PHONE, EVE_PHONE, SHIP_ADDRESS1, SHIP_ADDRESS2, SHIP_TOWN, 
SHIP_POSTCODE, BILL_ADDRESS1, BILL_ADDRESS2, BILL_TOWN, BILL_POSTCODE, 
CARDTYPE, CARDNUM, EXP_DATE, ISS_DATE, ISS_NUM, SECCODE)
b. Specify each value from the message that is to be added to the 
CUSTACCTB table. One value is inserted into each field of the database 
table. ESQL specifies fields by navigating through the hierarchical 
structure of the message from the root of the message body, which is 
known as 
Body
. Compare the values in the ESQL in Example 4-5 with the 
XML fields in Example 4-3 on page 80 to see how the ESQL navigates the 
message fields.
The order in which the values are listed in the ESQL determines the field 
into which each value is inserted. So the 
Body.Create_Customer_Account_MSG.Personal_Details.Last_Name 
value is inserted into the LAST_NAME field of the CUSTACCTB table and 
the 
Body.Create_Customer_Account_MSG.Payment_Details.Security_Code 
value is inserted into the SECCODE field of the CUSTACCTB table.
Example 4-5   Specifying the values to insert into the CUSTACCTB table
VALUES(Body.Create_Customer_Account_MSG.Personal_Details.Last_Name, 
Body.Create_Customer_Account_MSG.Personal_Details.First_Name, 
Body.Create_Customer_Account_MSG.Personal_Details.User_ID, 
Body.Create_Customer_Account_MSG.Personal_Details.Password, 
Body.Create_Customer_Account_MSG.Email_Address, 
Body.Create_Customer_Account_MSG.Daytime_Telephone, 
Body.Create_Customer_Account_MSG.Evening_Telephone, 
Body.Create_Customer_Account_MSG.Shipping_Address.Address_1, 
Body.Create_Customer_Account_MSG.Shipping_Address.Address_2, 
Body.Create_Customer_Account_MSG.Shipping_Address.Town, 
84
WebSphere Message Broker Basics
Body.Create_Customer_Account_MSG.Shipping_Address.Postcode, 
Body.Create_Customer_Account_MSG.Billing_Address.Address_1, 
Body.Create_Customer_Account_MSG.Billing_Address.Address_2, 
Body.Create_Customer_Account_MSG.Billing_Address.Town, 
Body.Create_Customer_Account_MSG.Billing_Address.Postcode, 
Body.Create_Customer_Account_MSG.Payment_Details.Card, 
Body.Create_Customer_Account_MSG.Payment_Details.Card_Number, 
Body.Create_Customer_Account_MSG.Payment_Details.Expiry_Date, 
Body.Create_Customer_Account_MSG.Payment_Details.Issue_Date, 
Body.Create_Customer_Account_MSG.Payment_Details.Issue_Number, 
Body.Create_Customer_Account_MSG.Payment_Details.Security_Code);
Example 4-6 shows the final ESQL code to use in the 
ESQL_Create_Customer_Account_Database module.
Example 4-6   ESQL for the ESQL_Create_Customer_Account_Database module
CREATE DATABASE MODULE ESQL_Create_Customer_Account_Database
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN
INSERT INTO Database.CUSTACCTB(LAST_NAME, FIRST_NAME, USERID, PASSWORD, 
EMAIL, DAY_PHONE, EVE_PHONE,  SHIP_ADDRESS1, SHIP_ADDRESS2, SHIP_TOWN, 
SHIP_POSTCODE, BILL_ADDRESS1, BILL_ADDRESS2, BILL_TOWN, BILL_POSTCODE, 
CARDTYPE, CARDNUM, EXP_DATE, ISS_DATE, ISS_NUM, SECCODE)
VALUES(Body.Create_Customer_Account_MSG.Personal_Details.Last_Name, 
Body.Create_Customer_Account_MSG.Personal_Details.First_Name, 
Body.Create_Customer_Account_MSG.Personal_Details.User_ID, 
Body.Create_Customer_Account_MSG.Personal_Details.Password, 
Body.Create_Customer_Account_MSG.Email_Address, 
Body.Create_Customer_Account_MSG.Daytime_Telephone, 
Body.Create_Customer_Account_MSG.Evening_Telephone, 
Body.Create_Customer_Account_MSG.Shipping_Address.Address_1, 
Body.Create_Customer_Account_MSG.Shipping_Address.Address_2, 
Body.Create_Customer_Account_MSG.Shipping_Address.Town, 
Body.Create_Customer_Account_MSG.Shipping_Address.Postcode, 
Body.Create_Customer_Account_MSG.Billing_Address.Address_1, 
Body.Create_Customer_Account_MSG.Billing_Address.Address_2, 
Body.Create_Customer_Account_MSG.Billing_Address.Town, 
Body.Create_Customer_Account_MSG.Billing_Address.Postcode, 
Body.Create_Customer_Account_MSG.Payment_Details.Card, 
Body.Create_Customer_Account_MSG.Payment_Details.Card_Number, 
Body.Create_Customer_Account_MSG.Payment_Details.Expiry_Date, 
Body.Create_Customer_Account_MSG.Payment_Details.Issue_Date, 
Body.Create_Customer_Account_MSG.Payment_Details.Issue_Number, 
Body.Create_Customer_Account_MSG.Payment_Details.Security_Code);
RETURN TRUE;
END;
Chapter 4. Developing applications with ESQL 
85
END MODULE;
7. Save the ESQL_Create_Customer_Account.esql and 
ESQL_Create_Customer_Account.msgflow files.
8. Create the following WebSphere MQ queues in WebSphere MQ Explorer on 
the WBRK6_DEFAULT_QUEUE_MANAGER queue manager:
– ESQL_BOOKSTORE_CCA_IN
– ESQL_BOOKSTORE_CCA_OUT
Remember to enter the value of the Backout requeue queue property on the 
ESQL_BOOKSTORE_CCA_IN queue as DLQ.
You have created the ESQL_Create_Customer_Account message flow, which is 
one of the Bookstore scenario message flows. When you have created the other 
message flow, ESQL_Book_Order, deploy and test them together.
4.3.3  Creating the ESQL_Book_Order message flow
The input message to the ESQL_Book_Order message flow contains an order 
from a customer on the online bookstore Web site. The order contains the 
customers’ identification and details of the books that they have ordered. When 
the message flow processes the message, it creates a confirmation message 
that contains details of the order, including a unique order number and the total 
price of all the books in the order. Example 4-7 shows the input message for the 
ESQL_Book_Order message flow.
Example 4-7   The input message for the ESQL_Book_Order message flow
<Create_Book_Order_MSG>
<Customer_ID>0123456789</Customer_ID>
<Order_Date>2005-09-27 12:55:12</Order_Date>
<First_Class>Yes</First_Class>
<Book_Details>
<ISBN>0123456789</ISBN>
<Book_Price>15.99</Book_Price>
<ISBN>1425112342</ISBN>
<Book_Price>7.99</Book_Price>
<ISBN>9736316345</ISBN>
<Book_Price>25.99</Book_Price>
</Book_Details>
</Create_Book_Order_MSG>
Example 4-8 on page 86 shows the output message that the message flow 
generates based on the input message shown in Example 4-7.
86
WebSphere Message Broker Basics
Example 4-8   The Book_Order_Response_MSG message for the ESQL_Book_Order 
message flow
<Book_Order_Response_MSG>
<Customer_ID>0123456789</Customer_ID>
<Order_Number>012345678920050927125512</Order_Number>
<Order_Date>2005-09-27 12:55:12</Order_Date>
<First_Class>Yes</First_Class>
<Book_Details>
<ISBN>0123456789</ISBN>
<Book_Price>15.99</Book_Price>
</Book_Details>
<Book_Details>
<ISBN>1425112342</ISBN>
<Book_Price>7.99</Book_Price>
</Book_Details>
<Book_Details>
<ISBN>9736316345</ISBN>
<Book_Price>25.99</Book_Price>
</Book_Details>
<Delivery_Price>18.00</Delivery_Price>
<Total_Price>49.97</Total_Price>
<Order_Status>Order Received</Order_Status>
</Book_Order_Response_MSG>
All of the ESQL that you need for this message flow is available in the Web 
material described in Appendix B, “Code” on page 319.
Figure 4-29 shows the finished ESQL_Book_Order message flow.
Figure 4-29   The ESQL_Book_Order message flow
To create the ESQL_Book_Order message flow:
1. In the Broker Application Development perspective, create a message flow 
called ESQL_Book_Order in the ESQL_Bookstore Message Flow Project. 
The ESQL_Book_Order.msgflow file opens in the Message Flow editor.
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