我们可以编写一个名为generate_random_string的函数,该函数接受两个参数:length(字符串长度)和charset(字符集)。 以下是一个示例函数,它使用递归CTE(公用表表达式)和字符串函数来生成随机字符串: sql CREATE OR REPLACE FUNCTION generate_random_string(length INTEGER, charset TEXT DEFAULT 'ABCDEFGHIJKLMNOPQRSTUVWXYZ...
COMMENT ON FUNCTION generate_random_string IS $docstring$ Generate a random string at a given length from a list of possible characters. Parameters: - length (int): length of the output string - characters (text): possible characters to choose from Example: db=# SELECT generate_random_string(...
--Function:--Generate a random string array--Parameters:--str_length: Length of string--max_length: Maximum length of the array--fixed_length: Whether the length of array is fixed. If it is true, the length of array will match max_length.createorreplacefunctiongen_random_string_array(str...
create or replace function random_string(integer) returns text as $body$ select array_to_string(array(select substring('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' FROM (ceil(random()*62))::int FOR 1) FROM generate_series(1, $1)), ''); $body$ language sql volatile; 来...
insert into t_userselectgenerate_series(1,10000000), random_string(20),st_setsrid(st_makepoint(150-random()*100,90-random()*100),4326); 步骤4:查询附近的人 1.首先在拾取坐标系统中随便找一个坐标。 此处用天安门广场的坐标作为示例:116.404177,39.909652。
insertintotestpg SELECTgenerate_series(1,100000)asxm,gen_id('1900-01-01','2017-10-16')asnum; AI代码助手复制代码 补充:postgreSql的id设置自动生成随机24位数字与字母组合(uuid) 我就废话不多说了,大家还是直接看代码吧~ @Id@GeneratedValue(generator="system_uuid")@GenericGenerator(name="system_uuid"...
CREATE OR REPLACE FUNCTION generate_random_string(length INTEGER) RETURNS VARCHAR LANGUAGE plpgsql AS $$ DECLARE result VARCHAR(255) := ''; chars TEXT[] := ARRAY['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v'...
select md5(random()::text),f_string(5) from generate_series(1,10); 使用MD5的随机结果 值来构造 字符串。 四,重复字符 select repeat(f_string(5),3) from generate_series(1,10); repeat 来造相同的数据 五 造汉字 create or replace function gen_hanzi(int) returns text as ’‘’ declare re...
select string_agg(substring('0123456789abcdefghjklmnopqrstuvwxyz', round(random() * 40)::integer, 1), '') from generate_series(1, 10); 1. 2. string_agg()是 聚合函数,用于将一列字符串连接成一个字符串 substring()用于从一个字符串中提取子串,substring(string, start, length) ...
$body$languagesqlvolatile;createtableperson(idint,name text, ageint);insertintopersonselectgenerate_series(1,1000000),random_string(floor(random()*20+10)),floor(random()*60+15);dropfunctionrandom_string(integer);selectpg_size_pretty(pg_relation_size('person'));commit;...