实现分割字符串。 DELIMITER $$ CREATE DEFINER=`root`@`%` FUNCTION `func_get_split_string_total`( f_string VARCHAR(1000),f_delimiter VARCHAR(5) ) RETURNS INT(11) BEGIN -- Get the total number of given string. RETURN 1+(LENGTH(f_string) - LENG
实现分割字符串。DELIMITER $$ CREATE DEFINER=`root`@`%` FUNCTION `func_get_split_string`( f_string VARCHAR(1000),f_delimiter VARCHAR(5),f_order INT) RETURNS VARCHAR(255) CHARSET utf8 BEGIN -- Get the separated number of given string. DECLARE result VARCHAR(255) DEFAULT ''; SET result = REVERSE(SUBSTRING_INDEX(REVERSE(SUBSTRING_INDEX(f_string,f_delimiter,f_order)),f_delimiter,1)); RETURN result; END$$ DELIMITER ;
DELIMITER $$ CREATE PROCEDURE `sp_print_result`( IN f_string VARCHAR(1000),IN f_delimiter VARCHAR(5) ) BEGIN -- Get the separated string. DECLARE cnt INT DEFAULT 0; DECLARE i INT DEFAULT 0; SET cnt = func_get_split_string_total(f_string,f_delimiter); DROP TABLE IF EXISTS tmp_print; CREATE TEMPORARY TABLE tmp_print (v_text varchar(200) NOT NULL); WHILE i 我们来执行:CALL sp_print_result(&#39;love,you,hate,number&#39;,&#39;,&#39;); query result v_text love you hate numbercreate or replace function split_to_string( IN f_string text, IN f_delimiter varchar(10) ) returns setof text as $ytt$ declare cnt int; declare i int; declare v_result text; begin i := 1; cnt := length(f_string) - length(replace(f_string,f_delimiter,&#39;&#39;))+1; while i <= cnt loop v_result := split_part(f_string,f_delimiter,i); return next v_result; i := i + 1; end loop; end; $ytt$ language plpgsql; 结果: t_girl=# select split_to_string(&#39;love,you,hate,number&#39;,&#39;,&#39;) as result; result -------- love you hate number (4 rows)t_girl=# SELECT ytt FROM regexp_split_to_table(&#39;love,you,hate,number&#39;, E&#39;,+&#39;) AS ytt; ytt -------- love you hate number (4 rows) t_girl=#第三种,用自带的WITH 语法来实现。t_girl=# with recursive ytt(f1,f2) as ( values (0,&#39; &#39;::text) union all select f1+1,split_part(&#39;love,you,hate,number&#39;,&#39;,&#39;,f1+1) from ytt where f1 <20 ) select f2 as result from ytt where f1 >=1 and f1 <= length(&#39;love,you,hate,number&#39;)-length(replace(&#39;love,you,hate,number&#39;,&#39;,&#39;,&#39;&#39;))+1; result -------- love you hate number (4 rows) Time: 0.742 ms