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MyBatis is configured using a SqlMapConfig.xml file located in the root of the classpath, eg in src/main/resources.
This configuration files setup MyBatis as well a pooled data source
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<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="useGeneratedKeys" value="false"/>
</settings>
<!-- Use type aliases to avoid typing the full classname every time. -->
<typeAliases>
<typeAlias alias="Order" type="org.apache.camel.example.mybatis.Order"/>
</typeAliases>
<!-- setup environment with JDBC data source -->
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="org.apache.derby.jdbc.EmbeddedDriver"/>
<property name="url" value="jdbc:derby:memory:mybatis;create=true"/>
</dataSource>
</environment>
</environments>
<!-- mapping files -->
<mappers>
<mapper resource="org/apache/camel/example/mybatis/Order.xml"/>
</mappers>
</configuration>
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We have a plain POJO org.apache.camel.example.mybatis.Order which just has getter/setters as shown below:
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public class Order {
private int id;
private String item;
private int amount;
private String description;
private boolean processed;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getItem() {
return item;
}
public void setItem(String item) {
this.item = item;
}
public int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public boolean isProcessed() {
return processed;
}
public void setProcessed(boolean processed) {
this.processed = processed;
}
}
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And the MyBatis mapping file Order.xml is located in src/main/resources/org/apache/camel/example/mybatis where we map from SQL to this Order POJO, as shown below:
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<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="Order">
<!-- Result maps describe the mapping between the columns returned
from a query, and the class properties. A result map isn't
necessary if the columns (or aliases) match to the properties
exactly. -->
<resultMap id="OrderResult" type="Order">
<result property="id" column="ORD_ID"/>
<result property="item" column="ITEM"/>
<result property="amount" column="ITEM_COUNT"/>
<result property="description" column="ITEM_DESC"/>
<result property="processed" column="ORD_DELETED"/>
</resultMap>
<!-- Select with no parameters using the result map for Order class. -->
<select id="selectOrders" resultMap="OrderResult">
select * from ORDERS where ORD_DELETED = false order by ORD_ID
</select>
<!-- Insert example, using the Order parameter class -->
<insert id="insertOrder" parameterType="Order">
insert into ORDERS (
ORD_ID,
ITEM,
ITEM_COUNT,
ITEM_DESC,
ORD_DELETED
)
values (
#{id}, #{item}, #{amount}, #{description}, false
)
</insert>
<update id="consumeOrder" parameterType="Order">
update ORDERS set ORD_DELETED = true where ORD_ID = #{id}
</update>
</mapper>
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You can install and run this example using it's features.xml with the following 2 shell commands (substitute the version the ${version} placeholder below with the concrete version of Camel in use):
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