Oracle apex 如何将列值从交互式网格获取到项目

我有一个交互式网格，其中列email\u to email\u是可编辑的网格，现在我需要获取我们在网格中的列中输入的值。我的项目是：p1\u email\u to，：p1\u email\u from

below is my query which is calling the email procedure, here i need to pass the item values which i am entering on screen but the item values are showing null, the grid values are not returning to items.
Here the query for on submit button:


DECLARE    
    p_division EMAIL_ERRORS.ORG_ID%TYPE;
    p_to EMAIL_ERRORS.TO_NAME%TYPE;
    p_from EMAIL_ERRORS.FROM_NAME%TYPE;
    p_message EMAIL_ERRORS.MESSAGE_TXT%TYPE;
    p_user EMAIL_ERRORS.USER_NAME%TYPE;
    p_sys_param_from EMAIL_ERRORS.SYS_PARAM_FROM_TXT%TYPE;
    p_attach EMAIL_ERRORS.ATTACH_TXT%TYPE;
    P_POST_OP EMAIL_ERRORS.POST_OP_TXT%TYPE;
    P_POST_OP_PARAM1 EMAIL_ERRORS.POST_OP_PARAM1_TXT%TYPE;
    P_POST_OP_PARAM2 EMAIL_ERRORS.POST_OP_PARAM2_TXT%TYPE;
    P_POST_OP_PARAM3 EMAIL_ERRORS.POST_OP_PARAM3_TXT%TYPE;

BEGIN   
    CAB$MAIL.send (p_to             => :P1_TO_NAME
                ,p_from           => :P1_FROM_NAME
                ,p_message        => :P1_MESSAGE_TXT
                ,p_user           => :P1_USER_NAME
                ,p_sys_param_from => :P1_SYS_PARAM_FROM_TXT
                ,p_division       => :P1_ORG_ID
                ,p_attach         => :P1_ATTACH_TXT
                ,P_POST_OP        => :P1_POST_OP_TXT
                ,P_POST_OP_PARAM1 => :P1_POST_OP_PARAM1_TXT
                ,P_POST_OP_PARAM2 => :P1_POST_OP_PARAM2_TXT
                ,P_POST_OP_PARAM3 => :P1_POST_OP_PARAM3_TXT);  


END;

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为什么要将列的值传递到项？这是怎么回事？如果您提交页面，是否将电子邮件发送给交互网格中每一行的人？如果是这样，您应该能够使用目标类型的PL/SQL代码创建一个交互式网格页面进程来发送电子邮件，而无需将值传输到页面项。