Mybatis returns the method for inserting the main key id

Configure useGeneratedKeys in xml's xml file

And keyProperty just return Id

<insert id="insertObject" useGeneratedKeys="true"  keyProperty="id" parameterType="www.change.tm.model.Orders" >
insert into orders
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="number!=null">
OrderNumber,
</if>
<if test="orderTime!=null">
orderTime,
</if>
</trim>
values
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="number!=null">
#{number},
</if>
<if test="orderTime!=null">
#{orderTime},
</if>
</trim>
</insert>

PS: The method in insert in Mybatis that returns the primary key ID

1, XyzMapper. xml

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

or

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

2, XyzMapper java

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

3. To have a field named yourId in map or c, Mybatis will automatically assign the primary key value to this field.

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"));

or

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

Well, this is the end, I hope to help you!