如何将SELECT查询的结果分配给mybatis中的java对象？

Question

I am trying to insert a list of authors into Author table in mybatis mapper xml using foreach loop as below,

AuthorVO.java

class AuthorVO {
private List<Author> authors;
...
} 

Author.java

class Author{
private int id;
private String name;
private String level;
....
}

Author.xml

<insert id="insertAuthor(authorVO)">
<foreach item="author" index="index" collection="authors">

INSERT into Author (id, name, level)
values
(
(select id from get_next_id where table_name="Author"),
#{author.name},
#{author.level}
)
</insert>

<!-- Need to copy the id value into the author object (author.id) -->

</foreach>

Here I am getting the primary key (id) for Author table from get_next_id table.

Now I need to update author.id with the primary key value. Something like:

#{author.id} = (select id from get_next_id where table_name="Author")

Please let me know the syntax or correct way of copying the id value from the table into the java pojo object (Author.id)?

Answer 1

Try using selectKey without foreach and looping thru collection in your java code instead:

<insert id="insertAuthor(authorVO)">
    <selectKey keyProperty="author.id" keyColumn="id" resultType="int" order="BEFORE">
        select id from get_next_id where table_name="Author"
    </selectKey>

    INSERT into Author (id, name, level)
    values
    (
         #{author.id},
         #{author.name},
         #{author.level}
    )
</insert>