MySQL truncate text with ellipsis

Suppose I have a MySQL table of one column: "Message". It is of type TEXT. I now want to query all rows, but the text can be large (not extremely large but large) and I only want to get a summary of them. For example the result can be populated into a list.

Is there a way to trim the text to a specific length (say, 10 characters), and add ellipsis if the text is t开发者_运维百科rimmed?

For example:

Message
-----------
12345678901234
1234567890
12345
12345678901

Query result:

1234567...
1234567890
12345
1234567...

Thanks!

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select case when length(message) > 7 
then concat(substring(message, 1, 7), '...')
else message end as adapted_message
from ...

to test/confirm:

SELECT CASE WHEN LENGTH('1234567890') > 7 
THEN CONCAT(SUBSTRING('1234567890', 1, 7), '...') 
ELSE '1234567890' END AS adapted_message

UNION  

SELECT CASE WHEN LENGTH('12345') > 7 
THEN CONCAT(SUBSTRING('12345', 1, 7), '...') 
ELSE '12345' END AS adapted_message

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Here's a simple one line solution:

IF(CHAR_LENGTH(message) > 10, CONCAT(LEFT(message, 7),"..."), message)

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or...

SELECT CONCAT(LEFT(message, 7), IF(LENGTH(message)>7, "…", ""))
FROM table

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You can declare a new ELLIPSIS function in order to make your query readable:

DELIMITER //

CREATE FUNCTION ELLIPSIS ( str TEXT, max_length INT )
RETURNS TEXT

BEGIN
   DECLARE str_out TEXT;

   IF LENGTH(str) <= max_length THEN
      SET str_out = str;
      
   ELSE
      SET str_out = CONCAT(SUBSTR(str, 1, max_length-3), '...');

   END IF;
   
   RETURN str_out;

END; //

DELIMITER ;

Then you simply do:

SELECT ELLIPSIS(Message, 10);

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Have a look at the MySQL string functions, documented here. You should be able to use some combination of substring and concat to achieve your desired behaviour.

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My approach:

• Let x be the maximum number of characters to display (therefore x + 3 dots will be the longest string displayed)
• You always want LEFT(field,x)
• If LENGTH(field) > x + 3, append 3 dots
• Otherwise if LENGTH(field) > x, append the remainder of field

SELECT CONCAT(
    LEFT(field,x),
    IF(LENGTH(field) > x+3,
       '...',
        IF(LENGTH(field) > x,
            MID(field,x+1,LENGTH(field)),
            ''
        )
    )
) FROM table