Mybatis中insert中返回主键ID的方法——MySQL

1、XyzMapper.xml（在插入过程自动获取一个自增的主键）

<insert id=“doSomething" parameterType="map" useGeneratedKeys="true" keyProperty=“yourId">
...
</insert>

或

<insert id="doSomething" parameterType="com.xx.yy.YourClass" useGeneratedKeys="true" keyProperty="yourId">
...
</insert>

2、XyzMapper.java

public int doSomething(Map<String, Object> parameters);

或

public int doSomething(YourClass c);

3、要在map或c中有一个字段名为yourId，Mybatis会自动把主键值赋给这个字段。

Map<String, Object> parameters = new HashMap<String, Object>();
parameters.put(“yourId”, 1234);
...
mapper.doSomething(parameters);
System.out.println(“id of the field that is primary key” + parameters.get(“yourId"));

或 

YourClass c = new YourClass();
...
mapper.doSomething(c);
System.out.println(“id of the field that is primary key” + c.yourId);

转载自：https://blog.csdn.net/prevention/article/details/32825081