使用 sql 从数据库中获取图像 scr

Question

我设法从 table table 的内容栏中获取了一张图片的详细信息。我想我需要把它放在存储过程中。但我不太确定如何放置它或从哪里开始。我需要从 table.

的内容栏中获取所有图像细节，而不仅仅是一张图像

uri	content	id
/websites/	<src="https://static.google.png">...< src="https://static.yahoo.png">	1
/website1/	<src="https://static.google2.png">...< src="https://static.yahoo3.png">	2

仅我当前查询returns

htt
https://static.google.png
https://static.google2.png

SELECT SUBSTR(src, 1, LOCATE('png',src)+2) AS htt from
        (select substr(
           substr(content, locate('src="', content) + 5), 1 ) as 'src'
        from exampletable
        WHERE substr(
           substr(content, locate('src="', content) + 5), 1 ) LIKE "https%" 
        )A 
WHERE SUBSTR(src, 1, LOCATE('png',src)+2) LIKE '%png' 
    AND  SUBSTR(src, 1, LOCATE('png',src)+2) NOT LIKE '%\<%' 
;

Answer 1

最好在您的应用程序中执行此操作

如果复制存储过程，需要在开头和结尾添加DELIMITER，只有Mysql Workbench自动添加。 DBfiddle也是这样，所以例子中没有

CREATE TABLE table1
    (`uri` varchar(10), `content` varchar(71), `id` int)
;
    
INSERT INTO table1
    (`uri`, `content`, `id`)
VALUES
    ('/websites/', '<src="https://static.google.png">...< src="https://static.yahoo.png">', 1),
    ('/website1/', '<src="https://static.google2.png">...< src="https://static.yahoo3.png">', 2)
;

CREATE  PROCEDURE `getimages`()
BEGIN
  DECLARE finished INTEGER DEFAULT 0;
  DECLARE _content TEXT DEFAULT "";

  -- declare cursor for employee email
  DEClARE curcontent 
      CURSOR FOR 
          SELECT `content` FROM table1;

  -- declare NOT FOUND handler
  DECLARE CONTINUE HANDLER 
        FOR NOT FOUND SET finished = 1;
        
        DROP TEMPORARY TABLE IF EXISTS new_tbl;
        CREATE TEMPORARY TABLE new_tbl (link VARCHAR(100));
  OPEN curcontent;

  getsrc: LOOP
      FETCH curcontent INTO _content;
      IF finished = 1 THEN 
          LEAVE getsrc;
      END IF;
      
      -- build email list
        getimg: LOOP
        sET @a := locate('src="', _content); 
                if locate('src="', _content) = 0  THEN
                   LEAVE getimg;
                END IF;
                
                INSERT INTO new_tbl VALUES (LEFT(SUBSTR(_content, locate('src="', _content) + 5),locate('.png"', substr(_content, locate('src="', _content) + 5)) +3));
                IF _content != RIGHT(_content, LOCATE('png',_content)+9) then
                  SET _content := RIGHT(_content, LOCATE('png',_content)+9);
              ELSE
                  LEAVE getimg;
              END IF;
                IF _content IS NULL then
                   LEAVE getimg;
                END IF;                
                IF LEnGTH (_content) < 4 then
                   LEAVE getimg;
                END IF;
      END LOOP getimg;
  END LOOP getsrc;
  CLOSE curcontent;
SELECT DISTINCT * FROM new_tbl;
END

cALL getimages()

| link                       |
| :------------------------- |
| https://static.google.png  |
| https://static.yahoo.png   |
| https://static.google2.png |
| https://static.yahoo3.png  |

✓

db<>fiddle here

使用 sql 从数据库中获取图像 scr

fetching image scr from database using sql

mysql

sql

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