iBATIS

The ibatis: component allows you to query, poll, insert, update and delete data in a relational database using Apache iBATIS.

Prefer MyBatis

Icon

The Apache iBatis project is no longer active. The project is moved outside Apache and is now know as the MyBatis project.
Therefore we encourage users to use MyBatis instead. This camel-ibatis component will be removed in Camel 3.0.

Maven users will need to add the following dependency to their pom.xml for this component:

URI format

Where statementName is the name in the iBATIS XML configuration file which maps to the query, insert, update or delete operation you wish to evaluate.

You can append query options to the URI in the following format, ?option=value&option=value&...

This component will by default load the iBatis SqlMapConfig file from the root of the classpath and expected named as SqlMapConfig.xml.
It uses Spring resource loading so you can define it using classpath, file or http as prefix to load resources with those schemes.
In Camel 2.2 you can configure this on the iBatisComponent with the setSqlMapConfig(String) method.

Options

Option

Type

Default

Description

consumer.onConsume

String

null

Statements to run after consuming. Can be used, for example, to update rows after they have been consumed and processed in Camel. See sample later. Multiple statements can be separated with comma.

consumer.useIterator

boolean

true

If true each row returned when polling will be processed individually. If false the entire List of data is set as the IN body.

consumer.routeEmptyResultSet

boolean

false

Sets whether empty result set should be routed or not. By default, empty result sets are not routed.

statementType

StatementType

null

Mandatory to specify for IbatisProducer to control which iBatis SqlMapClient method to invoke. The enum values are: QueryForObject, QueryForList, Insert, Update, Delete.

maxMessagesPerPoll

int

0

An integer to define a maximum messages to gather per poll. By default, no maximum is set. Can be used to set a limit of e.g. 1000 to avoid when starting up the server that there are thousands of files. Set a value of 0 or negative to disabled it.

isolation

String

TRANSACTION_REPEATABLE_READ

Camel 2.9: A String the defines the transaction isolation level of the will be used. Allowed values are TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_READ_COMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

isolation

String

TRANSACTION_REPEATABLE_READ

Camel 2.9: A String the defines the transaction isolation level of the will be used. Allowed values are TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_READ_COMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Message Headers

Camel will populate the result message, either IN or OUT with a header with the operationName used:

Header

Type

Description

CamelIBatisStatementName

String

The statementName used (for example: insertAccount).

CamelIBatisResult

Object

The response returned from iBatis in any of the operations. For instance an INSERT could return the auto-generated key, or number of rows etc.

Message Body

The response from iBatis will only be set as body if it's a SELECT statement. That means, for example, for INSERT statements Camel will not replace the body. This allows you to continue routing and keep the original body. The response from iBatis is always stored in the header with the key CamelIBatisResult.

Samples

For example if you wish to consume beans from a JMS queue and insert them into a database you could do the following:

Notice we have to specify the statementType, as we need to instruct Camel which SqlMapClient operation to invoke.

Where insertAccount is the iBatis ID in the SQL map file:

Using StatementType for better control of IBatis

When routing to an iBatis endpoint you want more fine grained control so you can control whether the SQL statement to be executed is a SELEECT, UPDATE, DELETE or INSERT etc. So for instance if we want to route to an iBatis endpoint in which the IN body contains parameters to a SELECT statement we can do:

In the code above we can invoke the iBatis statement selectAccountById and the IN body should contain the account id we want to retrieve, such as an Integer type.

We can do the same for some of the other operations, such as QueryForList:

And the same for UPDATE, where we can send an Account object as IN body to iBatis:

Scheduled polling example

Since this component does not support scheduled polling, you need to use another mechanism for triggering the scheduled polls, such as the Timer or Quartz components.

In the sample below we poll the database, every 30 seconds using the Timer component and send the data to the JMS queue:

And the iBatis SQL map file used:

Using onConsume

This component supports executing statements after data have been consumed and processed by Camel. This allows you to do post updates in the database. Notice all statements must be UPDATE statements. Camel supports executing multiple statements whose name should be separated by comma.

The route below illustrates we execute the consumeAccount statement data is processed. This allows us to change the status of the row in the database to processed, so we avoid consuming it twice or more.

And the statements in the sqlmap file:

See Also

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