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gf_split.txt

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+DELIMITER //
+
+CREATE OR REPLACE FUNCTION gf_split(
+  p_source TEXT,
+  p_split VARCHAR(2)
+) RETURNS TEXT
+/*
+  function   : 將傳入的字串, 依 p_split 切割為多筆資料, 傳回 table
+  description: 
+   呼叫範例: 
+      SELECT col FROM JSON_TABLE(gf_split('R,G,B',','), '$[*]'
+         COLUMNS(col VARCHAR(600) PATH '$.col')) t;
+		 
+	  SELECT col FROM JSON_TABLE(gf_split('R,G,B',','), '$[*]'
+         COLUMNS(rowid int PATH '$.rowid', col VARCHAR(600) PATH '$.col')) t WHERE rowid = 1;
+		 
+	必須要有  CREATE TABLE _split( guid varchar(100), rowid INT, col varchar(600) );
+	
+	https://www.sqlines.com/sql-server-to-mariadb/returns_table
+  build date : 2023/11/20
+  
+  modify history
+    item who        date       modify docs
+    ==== ========== ========== ================================================
+    1    michael    2011/09/08 新增
+    2    Michael    2025/07/11 改寫為MariaDB版本並優化
+*/
+BEGIN
+  DECLARE v_pos INT;
+  DECLARE v_cnt INT;
+  DECLARE v_length INT;
+  DECLARE v_temp TEXT;
+  DECLARE p_uuid VARCHAR(100);
+  DECLARE data TEXT;
+  
+  SET v_length = LENGTH(p_split);
+  SET v_temp = p_source;
+  SET p_uuid = UUID();
+  SET v_cnt = 1;
+
+  -- 循環處理分割
+  WHILE LOCATE(p_split, v_temp) > 0 DO
+    SET v_pos = LOCATE(p_split, v_temp);
+    INSERT INTO _split (guid, rowid, col) VALUES (p_uuid, v_cnt, SUBSTRING(v_temp, 1, v_pos - 1));
+	
+    SET v_temp = SUBSTRING(v_temp, v_pos + v_length);
+	SET v_cnt = v_cnt + 1;
+  END WHILE;
+  
+  -- 添加最後一部分
+  IF LENGTH(v_temp) > 0 THEN
+    INSERT INTO _split(guid, rowid, col) VALUES (p_uuid, v_cnt, v_temp);
+  END IF;
+  
+  SELECT JSON_ARRAYAGG(JSON_OBJECT('col', col))  INTO data 
+   FROM
+     (
+       SELECT col FROM _split WHERE guid = p_uuid
+     ) data;
+  
+  -- del temp data
+  delete from _split WHERE guid = p_uuid;
+  
+  RETURN data;
+END //
+
+DELIMITER ;