spring 如何传递多个参数并使用它们?
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How can I pass multiple parameters and use them?
提问by Jin Kwon
Hi I'm new to myBatis.
嗨,我是 myBatis 的新手。
I'm using MyBatis and Spring with mybatis-spring.
我将 MyBatis 和 Spring 与 mybatis-spring 一起使用。
How can I pass two different types of objects as parameters, and how can I use their properties in query?
如何将两种不同类型的对象作为参数传递,以及如何在查询中使用它们的属性?
<update id="update" parameterType="A, B"> <!-- @@? -->
UPDATE SOME WHERE x=A.x AND y=B.y <!-- @@? -->
</update>
回答by Roman Konoval
Do not specify parameterType
but use @Param
annotation on parameters in mapper:
不指定parameterType
而是@Param
在映射器中的参数上使用注释:
@Mapper
public interface MyMapper {
void update(@Param("a") A a, @Param("b") B b);
...
}
Then reference them in mapping:
然后在映射中引用它们:
<update id="update" >
UPDATE SOME WHERE x=#{a.x} AND y=#{b.y}
</update>
回答by Tural
Use parameterType="map" and @Param annotation.
使用 parameterType="map" 和 @Param 注释。
Method declared in interface:
接口中声明的方法:
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
不需要@Param注解的值必须等于参数名称
<insert id="mapCategoryAndPage" parameterType="map">
INSERT INTO
category_page_mapping (
page_local_id,
category_local_id)
VALUES
(#{pageLocalId},
#{categoryLocalId});
</insert>
回答by kiwiron
I would suggest reading the MyBatis documentation - it is pretty comprehensive and accurate.
我建议阅读 MyBatis 文档——它非常全面和准确。
Lets take an example: updating a customer's name from a com.mycompany.Customer POJO instance, which has a getFirstName() getter.
让我们举一个例子:从 com.mycompany.Customer POJO 实例更新客户的姓名,该实例具有 getFirstName() 获取器。
- 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}
- 将 Customer 类的实例作为参数传递
- 设置参数类型=“com.mycompany.Customer”。但是请查看别名工具 - 然后您可以使用速记版本parameterType="Customer"
- 在 SQL 中使用标准的 MyBatis 语法:... set FIRST_NAME = #{firstName}
(Edit) If you need to pass multiple objects there are various options:
(编辑)如果您需要传递多个对象,有多种选择:
- Pass a map containing the multiple objects
- Create a utility class the aggregates your multiple classes, and pass this as the parameter.
- 传递包含多个对象的地图
- 创建一个实用程序类来聚合您的多个类,并将其作为参数传递。
Again, please read the manual...
再次,请阅读手册...