oracle中设置主键

create table "c_user"(
"id" number primary key,
"username" varchar(255),
"password" varchar(255),
"p_name" varchar(255),
"p_number" varchar(255),
"p_date" varchar(255),
"p_referenceNumber" varchar(255),
"tech_area" varchar(255),
"platformLevel" varchar(255),
"address" varchar(255),
"permission" int(10),
"type1" varchar(255),
"union1" int(10),
"BTHconStruction" int(10),
"service1" varchar(255),
"service2" varchar(255),
"service3" varchar(255),
"course1" varchar(255),
"course2" varchar(255),
"course3" varchar(255),
"relyName" varchar(255),
"credit" varchar(255),
"relylegalName" varchar(255),
"phone" varchar(255),
"unitType" varchar(255),
"constructionUnit" varchar(255),
"directorName" varchar(255),
"directorSex" varchar(255),
"directorBirthyear" varchar(255),
"directorTitle" varchar(255),
"directorProfessional" varchar(255),
"directorEducation" varchar(255),
"directorDegree" varchar(255),
"directorTele" varchar(255),
"directorPhone" varchar(255),
"directorEmail" varchar(255),
"webName" varchar(255),
"webSite" varchar(255),
"addrplatformAddressess" varchar(255),
"email" varchar(255),
"state" int(2),
"u_type" int(6),
"p_type" int(2)

);

select * from user_constraints;

select * from user_constraints;

 select * from user_sequences;

create or replace trigger c_user_trigger 
before insert on "c_user"
for each row
when(new."id" is null)
begin
select c_user_id_seq.nextval into:new."id" from dual;
end;

　select * from user_triggers;

commit;//命令行操作需要
                        select * from "c_user";