greenplum은 함수를 통해 지정한 사용자 아래의 모든 테이블 문장을 가져옵니다.
10685 단어 데이터베이스 활용
--
CREATE OR REPLACE FUNCTION get_dbsize(dbname varchar)
RETURNS VARCHAR AS
$FUNCTION$
DECLARE
isExists varchar;
dbsize varchar;
databasename varchar;
BEGIN
select datname into databasename from pg_database where lower(datname) = dbname;
if databasename != '' THEN
select pg_size_pretty(pg_database_size(lower(dbname))) into dbsize;
return dbsize;
else
raise notice 'The database: % does not exists ! ',lower(dbname);
end if;
END;
$FUNCTION$
LANGUAGE PLPGSQL;
-- get_table_structure
CREATE PROCEDURAL LANGUAGE plpythonu;
create or replace function get_table_structure(tablename text)
returns text
as $$
try:
table_name = tablename.lower().split('.')[1]
talbe_schema=tablename.lower().split('.')[0]
except (IndexError):
return 'Please in put "tableschema.table_name"'
get_table_oid="select oid,reloptions,relkind from pg_class where oid='%s'::regclass"%(tablename)
try:
rv_oid=plpy.execute(get_table_oid,5)
if not rv_oid:
return 'Did not find any relation named"'+tablename +'".'
except (NameError):
return 'Did not find any relation named"'+tablename +'".'
table_oid=rv_oid[0]['oid']
rv_reloptions=rv_oid[0]['reloptions']
rv_relkind=rv_oid[0]['relkind']
create_sql="";
table_kind='table';
if rv_relkind !='r' and rv_relkind !='v':
plpy.error('%s is not table or view'%(tablename));
elif rv_relkind=='v':
get_view_def="select pg_get_viewdef(%s,'t') as viewdef;" % (table_oid)
rv_viewdef=plpy.execute(get_view_def);
create_sql='create view %s as
' % (tablename)
create_sql += rv_viewdef[0]['viewdef']+'
';
table_kind='view'
else:
get_columns="select a.attname,pg_catalog.format_type(a.atttypid,a.atttypmod),\
(select substring(pg_catalog.pg_get_expr(d.adbin,d.adrelid) for 128) \
from pg_catalog.pg_attrdef d where d.adrelid=a.attrelid and d.adnum=a.attnum and a.atthasdef) \
as default,a.attnotnull as isnull from pg_catalog.pg_attribute \
a where a.attrelid= %s and a.attnum >0 and not a.attisdropped order by a.attnum;" % (table_oid);
rv_columns=plpy.execute(get_columns)
get_table_distribution1="select attrnums from pg_catalog.gp_distribution_policy t where localoid = '" + table_oid + "' "
rv_distribution1=plpy.execute(get_table_distribution1,500)
rv_distribution2=''
if rv_distribution1 and rv_distribution1[0]['attrnums']:
get_table_distribution2="select attname from pg_attribute where attrelid='"+table_oid+"' and attnum in (" + str(rv_distribution1[0]['attrnums']).strip('{').strip('}').strip('[').strip(']')+")"
rv_distribution2=plpy.execute(get_table_distribution2,500)
create_sql='create table %s (
' % (tablename)
get_index="select pg_get_indexdef(indexrelid) as indexdef from pg_index where indrelid=%s" % (table_oid);
rv_index=plpy.execute(get_index);
get_parinfo1="select attname as columnname from pg_attribute where attnum =(select paratts[0] from pg_partition where parrelid=%s) and attrelid=%s;"%(table_oid,table_oid);
get_parinfo2=""" select pp.parrelid,prl.parchildrelid,case when pp.parkind='h'::"char" then 'hash'::text when pp.parkind='r'::"char" then 'range'::text when pp.parkind='l'::"char" then 'list'::text else null::text end as partitiontype,pg_get_partition_rule_def(prl.oid,true) as partitionboundary from pg_partition pp,pg_partition_rule prl where pp.paristemplate=false and pp.parrelid = %s and prl.paroid = pp.oid order by prl.parname; """ % (table_oid)
v_par_parent=plpy.execute(get_parinfo1);
v_par_info=plpy.execute(get_parinfo2);
max_column_len=10
max_type_len=4
max_modifiers_len=4
max_default_len=4
for i in rv_columns:
if i['attname']:
if max_column_len < i['attname'].__len__():
max_column_len=i['attname'].__len__()
if i['format_type']:
if max_type_len < i['format_type'].__len__():
max_type_len=i['format_type'].__len__()
if i['default']:
if max_type_len < i['default'].__len__():
max_default_len=i['default'].__len__()
first=True
for i in rv_columns:
if first==True:
split_char=' ';
first=False
else:
split_char=',';
if i['attname']:
create_sql += " " + split_char + i['attname'].ljust(max_column_len+6)+''
else:
create_sql += "" + split_char + ' '.ljust(max_column_len+6)
if i['format_type']:
create_sql += ' ' + i['format_type'].ljust(max_type_len +2)
else:
create_sql += ' ' + ' '.ljust(max_type_len+2)
if i['isnull'] and i['isnull']:
create_sql += ' ' + ' not null '.ljust(8)
if i['default']:
create_sql += ' default ' + i['default'].ljust(max_default_len+6)
create_sql += "
"
create_sql += ")"
if rv_reloptions:
create_sql +=" with ("+str(rv_reloptions).strip('{').strip('}').strip('[').strip(']') +")
"
create_sql = create_sql.replace("'",'')
if rv_distribution2:
create_sql += 'Distributed by ('
for i in rv_distribution2:
create_sql += i['attname'] + ','
create_sql =create_sql.strip(',')+')'
elif rv_distribution1:
create_sql += 'Distributed randomly
'
if v_par_parent:
partitiontype=v_par_info[0]['partitiontype'];
create_sql +='
PARTITION BY '+ partitiontype + "("+v_par_parent[0]['columnname']+")
(
";
for i in v_par_info:
create_sql +=" " +i['partitionboundary']+',
';
create_sql=create_sql.strip(',
');
create_sql+="
)"
create_sql+=";
"
for i in rv_index:
create_sql += i['indexdef']+';
'
get_table_comment="select 'comment on %s %s is '''|| COALESCE (description,'')|| '''' as comment from pg_description where objoid=%s and objsubid=0;" % (table_kind,tablename,table_oid)
get_column_comment="select 'comment on column %s.'||b.attname ||' is ''' || COALESCE(a.description,'')|| ''' ' as comment from pg_catalog.pg_description a,pg_catalog.pg_attribute b where objoid=%s and a.objoid=b.attrelid and a.objsubid=b.attnum;" % (tablename,table_oid)
rv_table_comment=plpy.execute(get_table_comment);
rv_column_comment=plpy.execute(get_column_comment);
for i in rv_table_comment:
create_sql += i['comment']+';
'
for i in rv_column_comment:
create_sql +=i['comment']+';
'
return create_sql;
$$ LANGUAGE plpythonu;
--
create table tab_structure(context text) distributed by context;
CREATE OR REPLACE FUNCTION get_cts(username varchar)
RETURNS void AS
$FUNCTION$
DECLARE
s_tab varchar;
schema_name varchar;
tabname varchar;
vsql text;
table_name cursor for select tablename from pg_tables where lower(tableowner) = username;
BEGIN
truncate table tab_structure;
select schemaname into schema_name from pg_tables where lower(tableowner) = username;
open table_name;
loop
fetch table_name into tabname;
if not found then
exit;
end if;
s_tab = schema_name ||'.' || tabname;
vsql = 'insert into tab_structure select get_table_structure('''||s_tab||''')';
execute vsql;
raise notice '% ',s_tab ;
end loop;
END;
$FUNCTION$
LANGUAGE PLPGSQL;
테스트:
전체 사용자 이름 대상 아래의 테이블 문장 함수 가져오기 실행
testdb=# select get_cts('test'); -- test
NOTICE: public.t
NOTICE: public.t1
NOTICE: public.tab_structure
get_cts
---------
(1 row)
작성된 테이블 문구가 저장된 테이블 tab_ 보기structure;
testdb=# select * from tab_structure ;
context
----------------------------------------
create table public.t (
id integer
)Distributed by (id);
create table public.t1 (
id integer
,name character varying
)Distributed by (id);
create table public.tab_structure (
context text
)Distributed by (context);
왜냐하면 get_table_structure (schema.tablename) 이 함수는 한 번에 한 장의 표 구조만 얻을 수 있습니다.따라서 pg_를 사용하지 않으면dump, 모든 테이블의 원본 테이블 문장을 얻기 위해 get_cts (username) 이 함수
파일에 원본 테이블 구문을 저장하고 다음 명령을 수행합니다.
[gpadmin@mpp01 ~]$ psql -U test -d testdb -At -c "select get_cts('test')"
NOTICE: public.t
NOTICE: public.t1
NOTICE: public.tab_structure
[gpadmin@mpp01 ~]$ psql -U test -d testdb -At -c "select * from tab_structure" >cts.sql
파일 보기cts.sql
[gpadmin@mpp01 ~]$ cat cts.sql
create table public.t (
id integer
)Distributed by (id);
create table public.t1 (
id integer
,name character varying
)Distributed by (id);
create table public.tab_structure (
context text
)Distributed by (context);
편리하니 참고하세요.
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