如何使用MyBatis在Oracle中获取最后一个插入ID？

Question

I'm inserting some data into an Oracle table and need to retrieve the id of the inserted row. Said id is being generated by a sequence and then inserted to the table by a trigger.

Now, I know there are several ways to get the id of the inserted row when using JDBC , but since I'm using MyBatis to execute the INSERT command, I can't seem to figure out how to obtain the id after inserting my data. Any advice would be greatly appreciated.

Answer 1

Something like this should work

class User {
  int userId
  ...
}

<insert id="addUser" useGeneratedKeys="true" keyColumn="user_id" keyProperty="userId">
  INSERT INTO user(login, name,...) VALUES(#{login}, #{name},...
</insert>

Answer 2

For me it works like this (mybatis 3)

<insert id="create" parameterType="Project" useGeneratedKeys="true" keyProperty="project.projectId" keyColumn="PROJECT_ID">
    INSERT INTO PROJECT (TITLE,DESCRIPTION)
    VALUES
    (#{title},#{description})
</insert>

No need for selectKey. Just sure to put the correct value in keyProperty.. I have a trigger before insert in oracle to get next id from sequence.

Alternatively this works also:

<insert id="createEmpty" statementType="CALLABLE" parameterType="Panelist">
    BEGIN INSERT INTO PANELIST(PANEL_ID) VALUES (#{panelId})
    RETURNING PANELIST_ID INTO
    #{panelist.panelistId,mode=OUT,jdbcType=INTEGER}; END;
</insert>

Answer 3

Let's say the trigger uses id_seq Oracle sequence to get the id. If you execute from MyBatis using the same database session, the SQL

select id_seq.currval from dual;

You will get the ID used.

Answer 4

With oracle, better is doing it in two phases. Works well and the price is only one more mapper:

First phase:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"     
"http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sample.work.dao.SequencerMapper" >
<select id="selectNextId" resultType="long" >
 select seq_sample.nextval from dual
</select>
</mapper>

You obtain the seq, put into your object place holder and

Second Phase:

insert your object