How can I pass multiple parameters and use them? - spring

Question

Hi I'm new to myBatis.
I'm using MyBatis and Spring with mybatis-spring.
How can I pass two different types of objects as parameters, and how can I use their properties in query?
<update id="update" parameterType="A, B"> <!-- ##? -->
UPDATE SOME WHERE x=A.x AND y=B.y <!-- ##? -->
</update>

Answer 1

Do not specify parameterType but use #Param annotation on parameters in mapper:
#Mapper
public interface MyMapper {
void update(#Param("a") A a, #Param("b") B b);
...
}
Then reference them in mapping:
<update id="update" >
UPDATE SOME WHERE x=#{a.x} AND y=#{b.y}
</update>

Answer 2

Use parameterType="map" and #Param annotation.
Method declared in interface:
void mapCategoryAndPage(#Param("categoryLocalId") Long categoryLocalId, #Param("pageLocalId") Long localId);
It is not required that value of #Param annotation must be equal to name of parameter
<insert id="mapCategoryAndPage" parameterType="map">
INSERT INTO
category_page_mapping (
page_local_id,
category_local_id)
VALUES
(#{pageLocalId},
#{categoryLocalId});
</insert>

Answer 3

I would suggest reading the MyBatis documentation - it is pretty comprehensive and accurate.
Lets take an example: updating a customer's name from a com.mycompany.Customer POJO instance, which has a getFirstName() getter.
Pass an instance of your Customer class as the parameter
Set the parameterType= "com.mycompany.Customer". But check out the alias facility - then you can use the shorthand version parameterType="Customer"
Use the standard MyBatis syntax in the SQL: ... set FIRST_NAME = #{firstName}
(Edit) If you need to pass multiple objects there are various options:
Pass a map containing the multiple objects
Create a utility class the aggregates your multiple classes, and pass this as the parameter.
Again, please read the manual...