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?

```xml
<update id="update" parameterType="A, B"> <!-- @@? -->
  UPDATE SOME WHERE x=A.x AND y=B.y <!-- @@? -->
</update>

```

Answer: 
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>

```
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.

1. Pass an instance of your Customer class as the parameter
2. Set the **parameterType= "com.mycompany.Customer**". But check out the alias facility - then you can use the shorthand version **parameterType="Customer"**
3. Use the standard MyBatis syntax in the SQL: **... set FIRST\_NAME = #{firstName}**

(Edit) If you need to pass multiple objects there are various options:

1. Pass a map containing the multiple objects
2. Create a utility class the aggregates your multiple classes, and pass this as the parameter.

Again, please read the manual...