CREATE OR REPLACE FUNCTION f_add_partition()
RETURNS void
LANGUAGE plpgsql
AS $function$
declare
v_max_childname text; --最大子表名称
v_parentname text; --子表对应的父表名称
v_suffix text; --子表日期后缀
sql text; --要执行的SQL语句
GRA_TO text; --赋予权限的语句
begin
--取出分区表最大分区表以及父表名称
for v_max_childname, v_parentname in select max(inhrelid::regclass::text),inhparent::regclass from pg_inherits where inhparent::regclass::text not like ‘%.%‘ group by inhparent
loop
raise notice ‘最大子表:%,父表:%‘,v_max_childname,v_parentname;
sql= ‘select split_part(‘‘‘|| v_max_childname || ‘‘‘,‘‘_‘‘,(length(‘‘‘ || v_max_childname || ‘‘‘)-length(replace(‘‘‘ || v_max_childname || ‘‘‘,‘‘_‘‘,‘‘‘‘))+1))‘; --取出日期是按月还是按日
execute sql into v_suffix; --将取出的日期存入v_suffix
while(length(v_suffix)=6 and v_suffix<‘201512‘) --判断如果是按月，那么循环执行建表语句并且赋予权限
loop
v_suffix=to_char (to_timestamp(v_suffix,‘yyyymm‘)+interval ‘1 month‘,‘yyyymm‘) ; --在取出的分区表日期按月+1
sql= ‘create table ‘||v_parentname ||‘_‘||v_suffix || ‘(like ‘ || v_parentname ||‘ including all) inherits (‘|| v_parentname ||‘)‘;
execute sql;
for GRA_TO in execute ‘select ‘‘grant ‘‘||privilege_type||‘‘ on ‘||v_parentname||‘_‘||v_suffix ||‘ to ‘‘||grantee from information_schema.table_privileges where table_name=‘‘‘||v_max_childname||‘‘‘‘ loop
execute GRA_TO;
end loop;
end loop;
while(length(v_suffix)=8 and v_suffix<‘20151231‘) --判断如果是按日分区，循环执行后面的建表语句并且赋予权限
loop
v_suffix=to_char (to_timestamp(v_suffix,‘yyyymmdd‘)+interval ‘1 day‘,‘yyyymmdd‘) ;
sql= ‘create table ‘||v_parentname||‘_‘||v_suffix || ‘(like ‘ || v_parentname ||‘ including all) inherits (‘|| v_parentname ||‘)‘;
execute sql;
for GRA_TO in execute ‘select ‘‘grant ‘‘||privilege_type||‘‘ on ‘||v_parentname||‘_‘||v_suffix||‘ to ‘‘||grantee from information_schema.table_privileges where table_name=‘‘‘||v_max_childname||‘‘‘‘ loop
execute GRA_TO;
end loop;
end loop;
end loop;
RAISE NOTICE ‘Partition table has be created successfully！‘;
end;
$function$
\dt
hank | tbl | table | hank
hank | tbl_20140322 | table | hank
hank | test | table | hank
hank | test_201405 | table | hank
select f_add_partition();
\dt
hank | tbl | table | hank
hank | tbl_20140322 | table | hank
按日分区的显示太多，此处省略一万行。。。。。
hank | tbl_20151230 | table | hank
hank | tbl_20151231 | table | hank
按月的比较少，就全部贴出来了
hank | test | table | hank
hank | test_201405 | table | hank
hank | test_201406 | table | hank
hank | test_201407 | table | hank
hank | test_201408 | table | hank
hank | test_201409 | table | hank
hank | test_201410 | table | hank
hank | test_201411 | table | hank
hank | test_201412 | table | hank
hank | test_201501 | table | hank
hank | test_201502 | table | hank
hank | test_201503 | table | hank
hank | test_201504 | table | hank
hank | test_201505 | table | hank
hank | test_201506 | table | hank
hank | test_201507 | table | hank
hank | test_201508 | table | hank
hank | test_201509 | table | hank
hank | test_201510 | table | hank
hank | test_201511 | table | hank
hank | test_201512 | table | hank
