<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>

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

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

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

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"));

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