Return 插入时主键不起作用 myBatis-Spring

Question

我有以下table和序列

CREATE TABLE teacher
(
  teacher_id serial NOT NULL,
  teacher_name character varying(50),
  CONSTRAINT teacher_pkey PRIMARY KEY (teacher_id)
)


CREATE SEQUENCE teacher_teacher_id_seq
  INCREMENT 1
  MINVALUE 1
  MAXVALUE 9223372036854775807
  START 1
  CACHE 1;

并希望在我插入新记录时获取主键。当我运行以下查询时，它有效并且 return 我想要的主键。

INSERT INTO teacher( teacher_name ) VALUES ('John') RETURNING teacher_id;

但是当我使用myBatis-Spring Mapper时如下

@Insert("INSERT INTO teacher( teacher_name ) " +
        "VALUES ( #{teacherName} ) RETURNING teacher_id" )
public int insertTeacher(Teacher teacher);

并使用有效的 teacher 对象调用函数，它插入了值但是 returns -1.

而且我还尝试了以下方法

@Insert("INSERT INTO teacher( teacher_id, teacher_name ) " +
            "VALUES ( #{teacherId}, #{teacherName} )" )
@SelectKey(statement="SELECT nextval('teacher_teacher_id_seq');", keyProperty="teacherId", before=true, resultType=int.class)
public int insertTeacher(Teacher teacher);

这个return1不管我叫多少次

谁能告诉我原因并给我解决方案？提前致谢。

Answer 1

找了很多，不像这个link which might work for older versions or iBatis(but this does not work with latest version), I found out that myBatis 3.x.x simply does not support returning auto generate id/key on insert. Instead it returns the number row updated, so in my case it returns 1. You can read more on this link中给出的解决方案。

Return 插入时主键不起作用 myBatis-Spring

Return primary key on insert does not work myBatis-Spring

postgresql

mybatis

spring-mybatis