Postgresデータベースのストアドプロシージャ、パーティションテーブル、空間フィールド、乱数など。
--查看所有表的行数
SELECT schemaname,relname,n_live_tup
FROM pg_stat_user_tables
ORDER BY n_live_tup DESC;--192.168.10.10:5432/postgis_21_sample@postgres/postgres
drop table linetest cascade;
CREATE TABLE linetest
(
gid integer,
the_geom geometry
);
--创建分区表
create or replace function creatTB9() returns
boolean AS
$BODY$
declare
jd integer;
wd integer;
_create_sql TEXT;
begin
FOR jd IN 1..3 LOOP
for wd in 1..3 loop
_create_sql:=format('CREATE TABLE line_partition_%s_%s(check(gid>0)) INHERITS(linetest);',jd,wd);
EXECUTE _create_sql;
end loop;
end loop;
return true;
end;
$BODY$
LANGUAGE plpgsql;
--创建规则
create or replace function creatRule9() returns
boolean AS
$BODY$
declare
jd integer;
wd integer;
_create_sql TEXT;
_create_rule TEXT;
begin
FOR jd IN 1..3 LOOP
for wd in 1..3 loop
_create_rule:=format('CREATE OR REPLACE RULE rule_%s_%s AS ON INSERT TO linetest WHERE the_geom && st_makeenvelope(%s,%s,%s,%s) DO INSTEAD INSERT INTO line_partition_%s_%s VALUES(NEW.*);',jd,wd,-180+((jd-1)*12),-90+((wd-1)*6),-180+(jd*12),-90+(wd*6),jd,wd);
EXECUTE _create_rule;
end loop;
end loop;
return true;
end;
$BODY$
LANGUAGE plpgsql;
--存储过程，insertTest3600_partitionAll
--参数说明
--njd:60（-180到180按6度等分）
--nwd:60(-90到90按3度等分)
--ncount:27778(一个亿除于60*60)
create or replace function fun_insert9() returns
boolean AS
$BODY$
declare ii integer;
declare jd integer;
declare wd integer;
declare n integer;
declare x3 double precision;
declare y3 double precision;
declare x2 double precision;
declare y2 double precision;
declare x1 double precision;
declare y1 double precision;
declare _create_sql TEXT;
begin
ii:=0;
FOR jd IN 1..3 LOOP
FOR wd IN 1..3 LOOP
FOR m IN 1..100 LOOP
FOR n IN 1..1000 LOOP
x1:=6*((jd-1)*2) + n/1000.0 -180;
y1:=3*((wd-1)*2)+ m/100.0-90;
x2:=x1+0.0001;
y2:=y1;
ii:= ii+1;
_create_sql:=format('insert into line_partition_%s_%s values(%s, ST_GeomFromText(''LINESTRING(%s %s,%s %s)'',4326));',jd,wd,ii,x1,y1,x2,y2);
--_create_sql:=format('insert into linetest values(%s, ST_GeomFromText(''LINESTRING(%s %s,%s %s)'',4326));',ii,x1,y1,x2,y2);
execute _create_sql;
end loop;
end loop;
end loop;
end loop;
return true;
end;
$BODY$
LANGUAGE plpgsql;
--the_geom geometry(Point,4326)
--创建分区表
select * from creatTB9() as tab;
--创建规则
select * from creatRule9() as tab;
--插入数据
select * from fun_insert9() as tab;
Successfully run. Total query runtime: 1 min 59 secs.
1 rows affected.
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--postgresql 函数之游标、更新数据
--postgresql 函数之游标、更新数据
--postgresql 函数之游标、更新数据
CREATE OR REPLACE FUNCTION fn_update_gid() returns
boolean AS
$BODY$
DECLARE
unbound_refcursor refcursor; --游标
n_refcursor refcursor; --游标
ctid1 VARCHAR(100);
jd integer;
wd integer;
ii integer;
i integer;
n integer;
gid1 integer;
_create_sql TEXT;
BEGIN
ii:=1;
FOR jd IN 1..3 LOOP
FOR wd IN 1..3 LOOP
_create_sql:=format('select ctid from line_partition_%s_%s',jd,wd);
open unbound_refcursor for execute _create_sql; --打开游标 并注入要搜索的字段的记录
_create_sql := format('select count(*) from line_partition_%s_%s',jd,wd);
open n_refcursor for execute _create_sql;
fetch n_refcursor into n;
FOR i IN 1..n LOOP
fetch unbound_refcursor into ctid1;--persPin, deptCode, deptName, deptId; --将游标指定的值赋值给变量
--if ctid1 is null then
--exit;
--end if;
_create_sql:=format('update line_partition_%s_%s set gid=%s where ctid=''%s'';',jd,wd,ii,ctid1);
--_create_sql:=format('update line_partition_1_1 set gid=%s where ctid=''%s'';',ii,ctid1);
execute _create_sql;
raise notice '%',_create_sql; --打印消息
--_all_sql := format('%s%s',_all_sql,_create_sql);
ii:=ii+1;
end loop; --结束循环
close n_refcursor;
close unbound_refcursor; --关闭游标
end loop;
end loop;
return true;
END$BODY$
LANGUAGE plpgsql;
select * from fn_update_gid() as tab;
--postgresql 函数之游标、更新数据
--postgresql 函数之游标、更新数据
--postgresql 函数之游标、更新数据
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--统计各数据库占用磁盘大小：
SELECT d.datname AS Name, pg_catalog.pg_get_userbyid(d.datdba) AS Owner,
CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))
ELSE 'No Access'
END AS SIZE
FROM pg_catalog.pg_database d
ORDER BY
CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
THEN pg_catalog.pg_database_size(d.datname)
ELSE NULL
END DESC -- nulls first
LIMIT 20
--统计数据库中各表占用磁盘大小：
SELECT
table_schema || '.' || table_name AS table_full_name,
pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS size
FROM information_schema.tables
ORDER BY
pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC