如何进行基于R12BusinessEvent+Workflow的分析
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成都创新互联：从2013年开始为各行业开拓出企业自己的“网站建设”服务，为超过千家公司企业提供了专业的成都网站制作、做网站、外贸营销网站建设、网页设计和网站推广服务， 按需网站策划由设计师亲自精心设计，设计的效果完全按照客户的要求，并适当的提出合理的建议，拥有的视觉效果，策划师分析客户的同行竞争对手，根据客户的实际情况给出合理的网站构架，制作客户同行业具有领先地位的。
今天做了个Business events + Workflow 的例子，记录一下。
功能描述：
当表中新增一条INVOICE信息，自动触发Business events, 然后调用Workflow，发Notification 给审批者审批。
主要目的是测试Business events 的功能，学习一下。
测是测通了，但做完后，发觉并没有了解Business events的优势，因为这样的功能，完全可以在记录新增时直接调用Workflow来处理，感觉系统标准的Business events也无非是在某个操作完成后，触发一个Events，来完成后继的操作，就算有延迟处理（Defer）的功能，似乎我们也可通过database job 来实现，订阅（Subscriptions）功能也似乎可以写Package来实现不同的业务逻辑的分支处理。
如果有TX看到我的困惑，请不吝赐教！
下面是例子的详细步骤。
1． 建立客户化表
Notification的定义如下：
注意Performer的定义，即为接收人
上传Workflow并注册至系统
Event subscription 的定义
注意，Phase 定义在100以下的为即时处理
注意： PL/SQL Rule Function 里为客制化的程序，用来完成Event 信息的保存和Event的初始化
Workflow Type 里既为上面开发的Workflow, Process 为里面唯一的 create or replace package body c_customer_invoice_pkg is
--用来生成测试数据及调用Events
procedure insert_data is
l_invoice_id number;
begin
select c_apps.c_customer_invoice_s.nextval into l_invoice_id from dual;
--Insert 数据
--3137为我的user id，此为测试方便，直接用。
insert into c_apps.c_customer_invoices_all
(invoice_id,
invoice_date,
invoice_amount,
submit_id,
submit_date,
approval_id,
approval_date,
approval_memo,
approval_status)
values
(l_invoice_id, sysdate, 1000, 3137, sysdate, null, null, null, null);
commit;
--调用过程启动Event
raise_event(l_invoice_id, 3137);
end insert_data;
--用来启动Event
PROCEDURE raise_event(pi_invoice_id in NUMBER, pi_submit_id in NUMBER) is
l_parameter_list wf_parameter_list_t := wf_parameter_list_t();
l_parameter_t wf_parameter_t := wf_parameter_t(null, null);
l_event_key NUMBER;
l_event_data varchar2(300);
l_message varchar2(10);
BEGIN
--用invoice id 做为event key
l_event_key := pi_invoice_id;
--定义event的参数
l_parameter_t.setName('INVOICE_ID');
l_parameter_t.setVALUE(pi_invoice_id);
l_parameter_list.extend;
l_parameter_list(1) := l_parameter_t;
l_parameter_t.setName('SUBMIT_ID');
l_parameter_t.setVALUE(pi_submit_id);
l_parameter_list.extend;
l_parameter_list(2) := l_parameter_t;
--启动
wf_event.raise(p_event_name => 'oracle.apps.c_apps.invoice.approval',
p_event_key => l_event_key,
--p_event_data => l_event_data,
p_parameters => l_parameter_list);
commit;
l_parameter_list.DELETE;
END raise_event;
--此过程设置在Subscription的rule function中,用来往表中写入Event信息
FUNCTION rule_function(p_subscription in RAW,
p_event in out NOCOPY WF_EVENT_T)
return varchar2 is
l_rule VARCHAR2(20);
l_parameter_list wf_parameter_list_t := wf_parameter_list_t();
l_parameter_t wf_parameter_t := wf_parameter_t(null, null);
i_parameter_name l_parameter_t.name%type;
i_parameter_value l_parameter_t.value%type;
i pls_integer;
l_invoice_id l_parameter_t.value%type;
l_submit_id l_parameter_t.value%type;
BEGIN
if p_event.geteventname() = 'oracle.apps.c_apps.invoice.approval' then
--获取Event的参数
l_parameter_list := p_event.getParameterList();
if l_parameter_list is not null then
i := l_parameter_list.FIRST;
--获取参数的值
while (i <= l_parameter_list.LAST) loop
i_parameter_name := null;
i_parameter_value := null;
i_parameter_name := l_parameter_list(i).getName();
i_parameter_value := l_parameter_list(i).getValue();
if i_parameter_name is not null then
if i_parameter_name = 'INVOICE_ID' then
l_invoice_id := i_parameter_value;
elsif i_parameter_name = 'SUBMIT_ID' then
l_submit_id := i_parameter_value;
end if;
end if;
i := l_parameter_list.NEXT(i);
end loop;
end if;
--写入Event表
insert into c_apps.c_customer_invoice_events
(event_id,
event_name,
event_key,
event_data,
event_date,
invoice_id,
submit_id)
values
(c_apps.c_customer_invoice_event_s.nextval,
p_event.getEventName,
p_event.getEventKey,
p_event.getEventData,
sysdate,
l_invoice_id,
l_submit_id);
--调用系统标准的Event rule
l_rule := wf_rule.default_rule(p_subscription, p_event);
end if;
return('SUCCESS');
EXCEPTION
WHEN OTHERS THEN
wf_core.context('c_customer_invoice_pkg',
'rule_function',
p_event.geteventname(),
p_subscription);
wf_event.seterrorinfo(p_event, 'ERROR');
RETURN 'ERROR';
END rule_function;
--用于Workflow,取得submit/approval的人员信息及发票信息
PROCEDURE get_submit_info(itemtype IN VARCHAR2,
itemkey IN VARCHAR2,
actid IN NUMBER,
funcmode IN VARCHAR2,
resultout OUT NOCOPY VARCHAR2) is
l_invoice_id NUMBER;
l_invoice_amount NUMBER;
l_invoice_date date;
l_orig_system wf_roles.orig_system%TYPE := 'PER';
l_submit_id NUMBER;
l_submit_name wf_roles.NAME%TYPE;
l_submit_display_name wf_roles.display_name%TYPE;
l_approval_id NUMBER;
l_approval_name wf_roles.NAME%TYPE;
l_approval_display_name wf_roles.display_name%TYPE;
begin
IF (funcmode <> wf_engine.eng_run) THEN
resultout := wf_engine.eng_null;
RETURN;
END IF;
l_invoice_id := wf_engine.getitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'INVOICE_ID');
l_submit_id := wf_engine.getitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'SUBMIT_ID');
wf_directory.GetRoleName(p_orig_system => l_orig_system,
p_orig_system_id => l_submit_id,
p_name => l_submit_name,
p_display_name => l_submit_display_name);
wf_engine.setitemattrtext(itemtype => itemtype,
itemkey => itemkey,
aname => 'SUBMIT_NAME',
avalue => l_submit_name);
wf_engine.setitemattrtext(itemtype => itemtype,
itemkey => itemkey,
aname => 'SUBMIT_DSP_NAME',
avalue => l_submit_display_name);
wf_directory.GetRoleName(p_orig_system => l_orig_system,
p_orig_system_id => l_submit_id,
p_name => l_approval_name,
p_display_name => l_approval_display_name);
wf_engine.setitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'APPROVAL_ID',
avalue => l_submit_id);
wf_engine.setitemattrtext(itemtype => itemtype,
itemkey => itemkey,
aname => 'APPROVAL_NAME',
avalue => l_approval_name);
wf_engine.setitemattrtext(itemtype => itemtype,
itemkey => itemkey,
aname => 'APPROVAL_DSP_NAME',
avalue => l_approval_display_name);
select invoice_amount, invoice_date
into l_invoice_amount, l_invoice_date
from c_apps.c_customer_invoices_all
where invoice_id = l_invoice_id;
wf_engine.setitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'INVOICE_AMOUNT',
avalue => l_invoice_amount);
wf_engine.SetItemAttrDate(itemtype => itemtype,
itemkey => itemkey,
aname => 'INVOICE_DATE',
avalue => l_invoice_date);
resultout := 'COMPLETE';
EXCEPTION
when others then
wf_core.context('C_CUSTOMER_INVOICE_PKG',
'get_submit_info',
itemtype,
itemkey,
TO_CHAR(actid),
funcmode,
SQLERRM);
raise;
end get_submit_info;
--用于Workflow的审批分支
PROCEDURE invoice_approval(itemtype IN VARCHAR2,
itemkey IN VARCHAR2,
actid IN NUMBER,
funcmode IN VARCHAR2,
resultout OUT NOCOPY VARCHAR2) is
l_invoice_id NUMBER;
l_approval_memo c_apps.c_customer_invoices_all.approval_memo%TYPE;
l_approval_id NUMBER;
begin
IF (funcmode <> wf_engine.eng_run) THEN
resultout := wf_engine.eng_null;
RETURN;
END IF;
l_invoice_id := wf_engine.getitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'INVOICE_ID');
l_approval_id := wf_engine.getitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'APPROVAL_ID');
l_approval_memo := wf_engine.getitemattrtext(itemtype => itemtype,
itemkey => itemkey,
aname => 'APPROVAL_MEMO');
UPDATE c_apps.c_customer_invoices_all
SET approval_id = l_approval_id,
approval_date = sysdate,
approval_memo = l_approval_memo,
approval_status = 'Y'
WHERE invoice_id = l_invoice_id;
resultout := 'COMPLETE';
EXCEPTION
when others then
wf_core.context('C_CUSTOMER_INVOICE_PKG',
'invoice_approval',
itemtype,
itemkey,
TO_CHAR(actid),
funcmode,
SQLERRM);
raise;
end invoice_approval;
--用于Workflow的拒绝分支
PROCEDURE invoice_reject(itemtype IN VARCHAR2,
itemkey IN VARCHAR2,
actid IN NUMBER,
funcmode IN VARCHAR2,
resultout OUT NOCOPY VARCHAR2) is
l_invoice_id NUMBER;
l_approval_memo c_apps.c_customer_invoices_all.approval_memo%TYPE;
l_approval_id NUMBER;
begin
IF (funcmode <> wf_engine.eng_run) THEN
resultout := wf_engine.eng_null;
RETURN;
END IF;
l_invoice_id := wf_engine.getitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'INVOICE_ID');
l_approval_id := wf_engine.getitemattrnumber(itemtype => itemtype,
itemkey => itemkey,
aname => 'APPROVAL_ID');
l_approval_memo := wf_engine.getitemattrtext(itemtype => itemtype,
itemkey => itemkey,
aname => 'APPROVAL_MEMO');
UPDATE c_apps.c_customer_invoices_all
SET approval_id = l_approval_id,
approval_date = sysdate,
approval_memo = l_approval_memo,
approval_status = 'N'
WHERE invoice_id = l_invoice_id;
resultout := 'COMPLETE';
EXCEPTION
when others then
wf_core.context('C_CUSTOMER_INVOICE_PKG',
'invoice_reject',
itemtype,
itemkey,
TO_CHAR(actid),
funcmode,
SQLERRM);
raise;
end invoice_reject;
end c_customer_invoice_pkg;
最后在PL/SQL中执行
BEGIN
c_customer_invoice_pkg.insert_data;
end;
查看Event表，记录生成，进入系统，发现Notification已经收到，可以正常审批！
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