Ibatis insert返回的Object值是什么

Question

在ibatis的insert操作中,会返回一个Object对象,这个对象就是返回的主键值,
而且是通过配置了selectKey才会返回的主键值,否则只会返回null,selectKey配置如下:
<insert id="insertPerson-Oracl" parameterClass="person">
       <selectKey resultClass="int" keyProperty="id">
          SELECT STOCKIDSEQUENCE.NEXTVAL AS ID FROM DUAL
       </selectKey>
       insert into
       PERSON(PER_ID,PER_FIRST.....)
       values(#id#,#firstName#....);
    </insert>

Answer 1

java.lang.Object insert(java.lang.String id,
java.lang.Object parameterObject)
throws java.sql.SQLException
Executes a mapped SQL INSERT statement. Insert is a bit different from other update methods, as it provides facilities for returning the primary key of the newly inserted row (rather than the effected rows). This functionality is of course optional.
The parameter object is generally used to supply the input data for the INSERT values.

Parameters:
id - The name of the statement to execute.
parameterObject - The parameter object (e.g. JavaBean, Map, XML etc.).
Returns:
[color=red]The primary key of the newly inserted row. This might be automatically generated by the RDBMS, or selected from a sequence table or other source.[/color]
Throws:
java.sql.SQLException - If an error occurs.