Module: PgPartitioner::SeparationType::Week

Defined in:
lib/pg_partitioner/separation_type/week.rb

Instance Method Summary collapse

Instance Method Details

#create_current_week_table ⇒ Object 



4
5
6
 
# File 'lib/pg_partitioner/separation_type/week.rb', line 4

def create_current_week_table
  create_week_table(Date.today)
end

#create_next_week_table ⇒ Object 



8
9
10
 
# File 'lib/pg_partitioner/separation_type/week.rb', line 8

def create_next_week_table
  create_week_table(Date.today.next_week)
end

#create_partitioning_by_week_triggers ⇒ Object 



38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/pg_partitioner/separation_type/week.rb', line 38

def create_partitioning_by_week_triggers
  sql = "CREATE OR REPLACE FUNCTION #{table_name}_insert_trigger() RETURNS trigger AS
    $$
     DECLARE
       curY varchar(4);
       curW varchar(2);
       tbl varchar(121);
     BEGIN
        select cast(DATE_PART('year', new.#{parting_column}) as varchar) into curY;
        select lpad(cast(DATE_PART('week', new.#{parting_column}) as varchar), 2, '0') into curW;
        tbl := '#{table_name}_y' || curY || 'w' || curW;
        EXECUTE format('INSERT into %I values ($1.*);', tbl) USING NEW;
        return NEW;
     END;
     $$
   LANGUAGE plpgsql;

   CREATE TRIGGER #{table_name}_insert
   BEFORE INSERT ON #{table_name}
   FOR EACH ROW
   EXECUTE PROCEDURE #{table_name}_insert_trigger();

   -- Trigger function to delete from the master table after the insert
   CREATE OR REPLACE FUNCTION #{table_name}_delete_trigger() RETURNS trigger
       AS $$
   DECLARE
       r #{table_name}%rowtype;
   BEGIN
       DELETE FROM ONLY #{table_name} where id = new.id returning * into r;
       RETURN r;
   end;
   $$
   LANGUAGE plpgsql;

   CREATE TRIGGER #{table_name}_after_insert
   AFTER INSERT ON #{table_name}
   FOR EACH ROW
   EXECUTE PROCEDURE #{table_name}_delete_trigger();"

  execute_sql(sql)
end

#create_week_table(date = Date.today) ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/pg_partitioner/separation_type/week.rb', line 18

def create_week_table(date = Date.today)
  date_start = date.at_beginning_of_week
  date_end = date.at_beginning_of_week.next_week
  partition_table_name = name_of_partition_table(date, type: :week)
  return 'Already exists' if connection.table_exists? partition_table_name

  sql = "CREATE TABLE IF NOT EXISTS #{partition_table_name} (
         CHECK ( #{parting_column} >= DATE('#{date_start}') AND #{parting_column} < DATE('#{date_end}') )
         ) INHERITS (#{table_name});"
  execute_sql(sql)
  sql = "ALTER TABLE #{partition_table_name} ADD PRIMARY KEY (id);"
  execute_sql(sql)

  disable_autovacuum(partition_table_name)
  create_partition_indexes(partition_table_name)
  create_partition_named_indexes(partition_table_name)
  create_partition_unique_indexes(partition_table_name)
  create_partition_named_unique_indexes(partition_table_name)
end

#drop_old_week_table ⇒ Object 



12
13
14
15
16
 
# File 'lib/pg_partitioner/separation_type/week.rb', line 12

def drop_old_week_table
  table_name = name_of_partition_table(Date.today.prev_week.prev_week,
                                       type: :week)
  drop_table(table_name)
end