After completion of the return to a primary key value

Add keyProperty attributes and attribute userGeneratedKeys insert the tag in the mapping files

<! - and returns the user to add primary key ->        <!--               keyProperty: The primary key for the entity based on attributes in               userGeneratedKeys: indicates whether to generate the primary key         -->        <insert id="insert" keyProperty="uid" useGeneratedKeys="true">               insert into users (name,age) value(#{uname},#{uage});        </insert>