iBatis

Since Camel 1.2

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

Prefer MyBatis

The Apache iBatis project is no longer active.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.

iBatis do not support Spring 4.x. So you can only use Spring 3.x or older with iBatis.

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

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-ibatis</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

ibatis:statementName[?options]

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

The iBatis component supports 4 options, which are listed below.

Name Description Default Type

sqlMapClient (advanced)

To use the given com.ibatis.sqlmap.client.SqlMapClient

SqlMapClient

sqlMapConfig (common)

Location of iBatis xml configuration file. The default value is: SqlMapConfig.xml loaded from the classpath

classpath:SqlMapConfig.xml

String

useTransactions (common)

Whether to use transactions. This option is by default true.

true

boolean

resolveProperty Placeholders (advanced)

Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.

true

boolean

The iBatis endpoint is configured using URI syntax:

ibatis:statement

with the following path and query parameters:

Path Parameters (1 parameters):

Name Description Default Type

statement

Required The statement name in the iBatis XML mapping file which maps to the query, insert, update or delete operation you wish to evaluate.

String

Query Parameters (27 parameters):

Name Description Default Type

isolation (common)

Transaction isolation level

TRANSACTION_REPEATABLE_READ

String

useTransactions (common)

Whether to use transactions. This option is by default true.

true

boolean

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

maxMessagesPerPoll (consumer)

This option is intended to split results returned by the database pool into the batches and deliver them in multiple exchanges. This integer defines the maximum messages to deliver in single exchange. 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 disable it.

0

int

onConsume (consumer)

Statement to run after data has been processed in the route

String

routeEmptyResultSet (consumer)

Whether allow empty resultset to be routed to the next hop

false

boolean

sendEmptyMessageWhenIdle (consumer)

If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead.

false

boolean

strategy (consumer)

Allows to plugin a custom IBatisProcessingStrategy to use by the consumer.

IBatisProcessing Strategy

useIterator (consumer)

Process resultset individually or as a list

true

boolean

exceptionHandler (consumer)

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer)

Sets the exchange pattern when the consumer creates an exchange.

ExchangePattern

pollStrategy (consumer)

A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel.

PollingConsumerPoll Strategy

statementType (producer)

Mandatory to specify for the producer to control which kind of operation to invoke.

StatementType

synchronous (advanced)

Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).

false

boolean

backoffErrorThreshold (scheduler)

The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.

int

backoffIdleThreshold (scheduler)

The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.

int

backoffMultiplier (scheduler)

To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured.

int

delay (scheduler)

Milliseconds before the next poll. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour).

500

long

greedy (scheduler)

If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages.

false

boolean

initialDelay (scheduler)

Milliseconds before the first poll starts. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour).

1000

long

runLoggingLevel (scheduler)

The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.

TRACE

LoggingLevel

scheduledExecutorService (scheduler)

Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool.

ScheduledExecutor Service

scheduler (scheduler)

To use a cron scheduler from either camel-spring or camel-quartz2 component

none

ScheduledPollConsumer Scheduler

schedulerProperties (scheduler)

To configure additional properties when using a custom scheduler or any of the Quartz2, Spring based scheduler.

Map

startScheduler (scheduler)

Whether the scheduler should be auto started.

true

boolean

timeUnit (scheduler)

Time unit for initialDelay and delay options.

MILLISECONDS

TimeUnit

useFixedDelay (scheduler)

Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.

true

boolean

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:

from("activemq:queue:newAccount").
  to("ibatis:insertAccount?statementType=Insert");

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:

  <!-- Insert example, using the Account parameter class -->
  <insert id="insertAccount" parameterClass="Account">
    insert into ACCOUNT (
      ACC_ID,
      ACC_FIRST_NAME,
      ACC_LAST_NAME,
      ACC_EMAIL
    )
    values (
      #id#, #firstName#, #lastName#, #emailAddress#
    )
  </insert>

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:

from("timer://pollTheDatabase?delay=30000").to("ibatis:selectAllAccounts?statementType=QueryForList").to("activemq:queue:allAccounts");

And the iBatis SQL map file used:

  <!-- Select with no parameters using the result map for Account class. -->
  <select id="selectAllAccounts" resultMap="AccountResult">
    select * from ACCOUNT
  </select>

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:

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