【Mybatis】Mybatis的批量执行SQL语句与返回值问题

【实验用到的数据库】

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

【实验用到的Mybatis版本】

       <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.9</version>
        </dependency>

【使用到的表及原始数据】

create table test04(
    id number(3),
    name nvarchar2(20),
    age number(3),
    primary key(id)
)

insert into test04(id,name,age) values('1','andy','22');
insert into test04(id,name,age) values('2','bill','23');
insert into test04(id,name,age) values('3','cindy','24');
insert into test04(id,name,age) values('4','douglas','25');

【Mapper.xml写法】

    <update id="updateTest2">
        BEGIN
        <choose>
            <when test="list!=null">
                <foreach collection="list" item="emp">
                    update test04 set name=#{emp.name} where age=#{emp.age};
                </foreach>
            </when>
        </choose>
        END;
    </update>

【对应函数】

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.util.List;

@Mapper
public interface Test03Mapper {
......
    int updateTest2(List<Emp> list);
}

【调用】

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class MybaticUpdateTest2 {
    public static void main(String[] args) throws Exception{
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory =
                new SqlSessionFactoryBuilder().build(inputStream);

        try (SqlSession session = sqlSessionFactory.openSession()) {
            Test03Mapper mapper = session.getMapper(Test03Mapper.class);

            List<Emp> list=new ArrayList<>();
            list.add(new Emp("Andy11",44));
            list.add(new Emp("Bill1",33));

            int cnt = mapper.updateTest2(list);
            System.out.println(cnt);

            session.commit();
        }
    }
}

【关于返回值的问题】

最尴尬的是，批量执行SQL语句后，无论数据库里被改了几条记录，返回值总是-1 !

而且，加了以下设置也无效：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="defaultExecutorType" value="SIMPLE"/>
    </settings>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
                <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"/>
                <property name="username" value="luna"/>
                <property name="password" value="1234"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="Test03Mapper.xml"/>
    </mappers>
</configuration>