1.创建常规的企业信息表
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create table t_centerprises(
objectid bigint not null, /*唯一编号(6位行政区号+6位sn)*/
divid uuid not null, /*行政区唯一代码*/
name text not null, /*企业名称*/
address text not null, /*企业地址*/
post text, /*企业邮编*/
contacts text, /*联系人*/
tel text, /*联系电话*/
fax text, /*传真*/
describe text, /*企业备注*/
date timestamp default now() not null, /*创建日期*/
constraint pk_centerprisess_objectid primary key (objectid),
constraint fk_centerprises_divid foreign key(divid) references ts_divisions(objectid) on delete cascade
);
create index idx_centerprises_divid on t_centerprises(divid);
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2.需要使用的函数
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/*转换16进制到字符*/
drop function if exists hex_to_string(text);
create or replace function hex_to_string( text)
returns text as
$$
declare
result text;
begin
execute 'select U&''\' || $1 || '''' INTO result;
return result;
end;
$$ language plpgsql;
/*随机生成汉字
汉字范围U+4E00..U+9FA5
*/
drop function if exists gen_random_zh(int,int);
create or replace function gen_random_zh(imin int,imax int)
returns text as
$$
declare
vlen integer;
result text;
begin
result := '';
vlen = floor(random()*(imax-imin)+imin);
for i in 1..vlen loop
result := result || hex_to_string(to_hex(floor(random()*(42191-19968)+19968)::integer));
end loop;
return result;
end;
$$ language plpgsql;
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insert into t_centerprises(objectid,divid,name,address,post,contacts,tel,fax,describe)
select (vdivid|| lpad(id::text,6,'0'))::bigint as objectid,'110101',
gen_random_zh(5,25) as name,gen_random_zh(10,50) as address,
floor(random()*(699999-600000)+600000) as post,gen_random_zh(2,8) as contacts,
floor(random()*(69999999-60000000)+60000000) as tel,floor(random()*(69999999-60000000)+60000000) as fax,
gen_random_zh(32,128) as describe
from generate_series(1,5000000) as id;
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在普通pc机上插入,大概完成时间约8小时,过程不可监控,并且cpu/内存占用率高,磁盘基本满负荷动作,读写率基本上都是100%.
4.改进后的方法, 插入(10000000条)
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do $$
declare vStart bigint;
declare vEnd bigint;
declare MAXVALE bigint;
declare INTERVAL bigint;
declare vprovince integer;
declare vprefecture integer;
declare vcounty integer;
declare vdivid text;
declare vdividex uuid;
begin
vprovince := 10;vprefecture := 1;vcounty := 1;
MAXVALE := 1000000;
INTERVAL := 1000; vStart := 1 ;vEnd := INTERVAL;
vdivid := (lpad(vprovince::text,2,'0') || lpad(vprefecture::text,2,'0') || lpad(vcounty::text,2,'0'))::text;
vdividex := (select objectid from ts_divisions where province=vprovince and prefecture=vprefecture and county=vcounty);
loop
insert into t_centerprises(objectid,divid,name,address,post,contacts,tel,fax,describe)
select (vdivid|| lpad(id::text,6,'0'))::bigint as objectid,vdividex as divid,
gen_random_zh(5,25) as name,gen_random_zh(10,50) as address,
floor(random()*(699999-600000)+600000) as post,gen_random_zh(2,8) as contacts,
floor(random()*(69999999-60000000)+60000000) as tel,floor(random()*(69999999-60000000)+60000000) as fax,
gen_random_zh(32,128) as describe
from generate_series(vStart,vEnd) as id;
raise notice '%', vEnd;
vStart := vEnd + 1; vEnd := vEnd + INTERVAL;
if( vEnd > MAXVALE ) then
return;
elsif(vEnd = MAXVALE) then
vEnd := vEnd - 1;
end if;
end loop;
end$$;
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因为运算原因, cpu/内存占用率仍然很高, 硬盘负荷较小,读写率也比较低,大概完成时间约1.5小时.
补充：postgreSQL数据库 向表中快速插入1000000条数据
不用创建函数，直接向表中快速插入1000000条数据
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create table tbl_test (id int, info text, c_time timestamp);
insert into tbl_test select generate_series(1,100000),md5(random()::text),clock_timestamp();
select count(id) from tbl_test; --查看个数据条数
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以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。如有错误或未考虑完全的地方，望不吝赐教。
原文链接：https://blog.csdn.net/kmblack1/article/details/69666667