获取数字和字母混合的任意长度的字符串
- create or replace function random_string(length integer) returns text as
- $$
- declare
- chars text[] := '{0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z}';
- result text := '';
- i integer := 0;
- begin
- if length < 0 then
- raise exception 'Given length cannot be less than 0';
- end if;
- for i in 1..length loop
- result := result || chars[1+random()*(array_length(chars, 1)-1)];
- end loop;
- return result;
- end;
- $$ language plpgsql;
来源: https://www.oschina.net/code/snippet_79159_58638