Oracle में डुप्लिकेट मर्ज

create table city ( id number not null, name varchar2(30) not null ); create unique index city_pk on city(id); alter table city add constraint city_pk primary key(id); create table street ( id number not null, city_id number not null, name varchar2(30) not null ); create unique index street_pk on street(id); create index street_fk on street(city_id); alter table street add constraint street_pk primary key(id); alter table street add constraint fk_street foreign key (city_id) references city(id); create table address ( id number not null, street_id number not null, house varchar2(10) not null, apartment varchar2(10) ); create unique index address_pk on address(id); create index address_fk on address(street_id); alter table address add constraint address_pk primary key(id); alter table address add constraint fk_address foreign key (street_id) references street(id); 

 insert into city(id, name) values (1, ''); insert into street(id, city_id, name) values (1, 1, ''); insert into street(id, city_id, name) values (2, 1, ' '); insert into address(id, street_id, house, apartment) values (1, 1, '10', '1'); insert into address(id, street_id, house, apartment) values (2, 2, '10', '2'); 

 create table mg_table ( name varchar2(30) not null ); create unique index mg_table_pk on mg_table(name); alter table mg_table add constraint mg_table_pk primary key(name); create sequence mg_merge_seq; create table mg_merge ( id number not null, table_name varchar2(30) not null, old_id number not null, new_id number not null ); create unique index mg_merge_pk on mg_merge(id); create unique index mg_merge_uk on mg_merge(table_name, old_id); alter table mg_merge add constraint mg_merge_pk primary key(id); alter table mg_merge add constraint fk_mg_merge foreign key (table_name) references mg_table(name); create sequence mg_ref_seq; create table mg_ref ( id number not null, merge_id number not null, table_name varchar2(30) not null, pk_name varchar2(30) not null, column_name varchar2(30) not null, object_id number not null ); create unique index mg_ref_pk on mg_ref(id); create index mg_ref_fk on mg_ref(merge_id); alter table mg_ref add constraint mg_ref_pk primary key(id); alter table mg_ref add constraint fk_mg_ref foreign key (merge_id) references mg_merge(id); 

 create or replace package mg_merge_pkg as procedure merge(p_name in varchar2, p_old in number, p_new in number); procedure undo(p_id in number); procedure undo; end mg_merge_pkg; / show errors; create or replace package body mg_merge_pkg as e_unsupported_error EXCEPTION; pragma EXCEPTION_INIT(e_unsupported_error, -20001); cursor c_col(p_name varchar2, p_pk varchar2) is select column_name from user_tab_columns where table_name = upper(p_name) and column_name <> p_pk; procedure merge(p_name in varchar2, p_old in number, p_new in number) as cursor c_fk is select b.table_name, c.column_name, e.column_name pk_name from user_constraints a inner join user_constraints b on (b.r_constraint_name = a.constraint_name) inner join user_cons_columns c on (c.constraint_name = b.constraint_name) inner join user_constraints d on (d.table_name = b.table_name and d.constraint_type = 'P') inner join user_cons_columns e on (e.constraint_name = d.constraint_name) where a.table_name = upper(p_name); r_fk c_fk%rowtype; r_col c_col%rowtype; l_id number default null; l_cn number default null; l_pk varchar2(30) default null; l_sql varchar2(500) default null; begin select max(cn) into l_cn from ( select b.constraint_name, count(*) cn from user_constraints a inner join user_constraints b on (b.r_constraint_name = a.constraint_name) inner join user_cons_columns c on (c.constraint_name = b.constraint_name) where a.table_name = upper(p_name) group by b.constraint_name ); if l_cn > 1 then RAISE_APPLICATION_ERROR(-20001, 'Can''t support multicolumn FK'); end if; select c.column_name into l_pk from user_constraints a inner join user_cons_columns c on (c.constraint_name = a.constraint_name) where a.table_name = upper(p_name) and a.constraint_type = 'P'; select count(*) into l_cn from mg_table where name = upper(p_name); if l_cn = 0 then insert into mg_table(name) values (upper(p_name)); execute immediate 'create table mg_' || p_name || ' as select * from ' || upper(p_name) || ' ' || 'where rownum = 0'; execute immediate 'create unique index mg_' || p_name || '_pk on mg_' || p_name || '(' || l_pk || ')'; end if; insert into mg_merge(id, table_name, old_id, new_id) values (mg_merge_seq.nextval, upper(p_name), p_old, p_new) returning id into l_id; open c_fk; loop fetch c_fk into r_fk; exit when c_fk%notfound; execute immediate 'insert into mg_ref(id, merge_id, table_name, pk_name, column_name, object_id) ' || 'select mg_ref_seq.nextval, :merge_id, :tab_name, :pk_name, :col_name, ' || r_fk.pk_name || ' ' || 'from ' || r_fk.table_name || ' where ' || r_fk.column_name || ' = :old_id' using l_id, r_fk.table_name, r_fk.pk_name, r_fk.column_name, p_old; execute immediate 'update ' || r_fk.table_name || ' set ' || r_fk.column_name || ' = :new_id ' || 'where ' || r_fk.column_name || ' = :old_id' using p_new, p_old; end loop; close c_fk; l_sql := 'insert into mg_' || p_name || '(' || l_pk; open c_col(p_name, l_pk); loop fetch c_col into r_col; exit when c_col%notfound; l_sql := l_sql || ',' || r_col.column_name; end loop; close c_col; l_sql := l_sql || ') select '|| l_pk; open c_col(p_name, l_pk); loop fetch c_col into r_col; exit when c_col%notfound; l_sql := l_sql || ',' || r_col.column_name; end loop; close c_col; l_sql := l_sql || ' from ' || p_name || ' where ' || l_pk || ' = :old_id'; execute immediate l_sql using p_old; execute immediate 'delete from ' || p_name || ' where ' || l_pk || ' = :id' using p_old; commit; exception when others then if c_fk%isopen then close c_fk; end if; if c_col%isopen then close c_col; end if; rollback; raise; end; procedure undo(p_id in number) as cursor c_fk is select table_name, pk_name, column_name from mg_ref where merge_id = p_id group by table_name, pk_name, column_name; r_fk c_fk%rowtype; r_col c_col%rowtype; l_name varchar2(30) default null; l_old number default null; l_new number default null; l_cn number default null; l_pk varchar2(30) default null; l_sql varchar2(500) default null; begin select table_name, old_id, new_id into l_name, l_old, l_new from mg_merge where id = p_id; select count(*) into l_cn from mg_merge where old_id = l_new; if l_cn > 0 then RAISE_APPLICATION_ERROR(-20001, 'Can''t undo'); end if; select c.column_name into l_pk from user_constraints a inner join user_cons_columns c on (c.constraint_name = a.constraint_name) where a.table_name = upper(l_name) and a.constraint_type = 'P'; l_sql := 'insert into ' || l_name || '(' || l_pk; open c_col(l_name, l_pk); loop fetch c_col into r_col; exit when c_col%notfound; l_sql := l_sql || ',' || r_col.column_name; end loop; close c_col; l_sql := l_sql || ') select '|| l_pk; open c_col(l_name, l_pk); loop fetch c_col into r_col; exit when c_col%notfound; l_sql := l_sql || ',' || r_col.column_name; end loop; close c_col; l_sql := l_sql || ' from mg_' || l_name || ' where ' || l_pk || ' = :old_id'; execute immediate l_sql using l_old; open c_fk; loop fetch c_fk into r_fk; exit when c_fk%notfound; execute immediate 'merge into ' || r_fk.table_name || ' d using mg_ref s '|| 'on (s.object_id = d.' || r_fk.pk_name || ' and s.merge_id = :id and s.table_name = :tab_name and s.column_name = :col_name) ' || 'when matched then ' || 'update set d.' || r_fk.column_name || ' = :old_id' using p_id, r_fk.table_name, r_fk.column_name, l_old; end loop; close c_fk; execute immediate 'delete from mg_' || l_name || ' where ' || l_pk || ' = :id' using l_old; delete from mg_ref where merge_id = p_id; delete from mg_merge where id = p_id; commit; exception when others then if c_fk%isopen then close c_fk; end if; if c_col%isopen then close c_col; end if; rollback; raise; end; procedure undo as l_id number default null; begin select max(id) into l_id from mg_merge; undo(l_id); end; end mg_merge_pkg; / show errors;