[英]How can I map a parameter of entity type with foreach tag of mybatis?
There is an attribute of list type named 'carType' in an entity, the entity is like below: 实体中有一个名为“ carType”的列表类型的属性,该实体如下所示:
public class Car{
private List carType;
private String carName;
public void setCarType(List carType){
this.carType = carType;
}
public List getCarType(){
return carType;
}
}
I assigned it a value before calling the DAO interface , just like : 我在调用DAO接口之前为其分配了一个值,就像:
Car car = new Car();
car.setCarType = [1,2,3];
List list = Dao.car(Car car);
Then I tried to map the parameter with foreach tag of mybatis: 然后,我尝试使用mybatis的foreach标签映射参数:
<select id='car'>
select car_name, car_type from tb_car
where car_type in
<foreach item="item" collection="carType" separator="," open="(" close=")" index="">
#{item}
</foreach>
</select>
Moreover, I hope the result is as follows: 此外,我希望结果如下:
select car_name, car_type from tb_car
where car_type in (1, 2, 3)
But the following error occurred after debugging: 但是调试后发生以下错误:
org.mybatis.spring.MyBatisSystemException: nested exception is
org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.IllegalArgumentException:
invalid comparison: java.util.ArrayList and java.lang.String
### Cause: java.lang.IllegalArgumentException: invalid comparison:
java.util.ArrayList and java.lang.String
I knew that I can fix it with parameter of Hashmap type, but could you tell me how to correct my code in this way ? 我知道我可以使用Hashmap类型的参数修复它,但是您能告诉我如何以这种方式纠正代码吗?
Is parameter a List type? 参数是列表类型吗? try
<select id='car' parameterType="java.util.List">
尝试
<select id='car' parameterType="java.util.List">
Or Car
type? 还是
Car
类型? try <select id='car' parameterType="your.class.package.Car">
尝试
<select id='car' parameterType="your.class.package.Car">
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