I have string "this is my test string" and I want to remove only word "my".
The problem is word "my" will select from another query as
select word from table
I tried this if I know the word
set string = REPLACE(string,'my','');
So, any help
I want to do something like
set string = REPLACE(string,select word from table,'');
my query is
set #test = 'this is my test query';
DROP TABLE IF EXISTS `test`;
CREATE TEMPORARY TABLE IF NOT EXISTS test(word longtext );
insert into test values('my');
insert into test values('test');
select replace(#test,(select word from test),'');
I have got error of sub query should returns 1 row
select replace(#test,word,'') from test;
...
select #test:=replace(#test,word,'') from test;
However keep in mind that you have multiple entries in the test table, #test will end up with all the words in table test replaced with ''. If that is what you want then all okay.
If you want a list output with #test with different words replaced use the first query and parse it in whatever you are passing the data to.
Maybe there's a better way but try this procedure
CREATE PROCEDURE myProc(IN teststring VARCHAR(255),
OUT teststring_new varchar(255))
BEGIN
DECLARE n INT DEFAULT 0;
DECLARE i INT DEFAULT 0;
SELECT COUNT(*) FROM test INTO n;
SET teststring_new = teststring;
SET i=0;
WHILE i<n DO
SELECT replace(teststring_new,(SELECT word FROM test LIMIT 1 OFFSET i),'') INTO teststring_new;
SET i = i + 1;
END WHILE;
SELECT teststring_new;
END//
to call this
set #test = 'this is my test query';
call myProc(#test, #outvalue)
I think the following will work in MySQL:
select #test = replace(#test, t.word, '')
from test t;
Do note that this works for a string in a variable. It doesn't readily generalize to a column of such strings in a table.
Related
Thanks to this answer https://stackoverflow.com/a/8180159/16349298 , i'm able to translate
a string into a temporary table (usable for WHERE <id> IN <tmpTable>.<colomn>)
The only modification i made is at the end (The select) :
CREATE PROCEDURE stringToTmpTable(IN inputString VARCHAR(255), IN sep VARCHAR(255))
BEGIN
declare pos int; -- Keeping track of the next item's position
declare item varchar(100); -- A single item of the input
declare breaker int; -- Safeguard for while loop
-- The string must end with the delimiter
if right(inputString, 1) <> sep then
set inputString = concat(inputString, sep);
end if;
DROP TABLE IF EXISTS MyTemporaryTable;
CREATE TEMPORARY TABLE MyTemporaryTable ( columnName varchar(100) );
set breaker = 0;
while (breaker < 2000) && (length(inputString) > 1) do
-- Iterate looking for the delimiter, add rows to temporary table.
set breaker = breaker + 1;
set pos = INSTR(inputString, sep);
set item = LEFT(inputString, pos - 1);
set inputString = substring(inputString, pos + 1);
insert into MyTemporaryTable values(item);
end while;
SELECT * FROM MyTemporaryTable;
END
I would like to use this process in a function or procedure in order to call it in any procedure that needs it.
So here is the problem :
I don't know how to store the result of this procedure into a variable : i can't use the SELECT * INTO #p FROM ...; like CALL stringToTmpTable(<string>,<separator>) INTO #table;
An other way would be to add OUT parameter to stringToTmpTable() but it can't return multiple rows. Unfortunatly the amount of parameters in the string is variable so i can't define as much variable as there is parameters in the string.
Finally the FIND_IN_SET() isn't the solution i need.
In the worst case I could copy / past the stringToTmpTable() process in any other procedure that needs it, but that doesn't seem like the best way to me.
Any suggestions ?
"i'm able to translate a string into a temporary table" too, but I am using a different method:
SET #input = 'Banana, Apple, Orange, Pears';
WITH RECURSIVE cte1 as (
select
#input as s,
substring_index(substring_index(#input,',',1),',',-1) as w,
length(#input)-length(replace(#input,',','')) x
union all
select
substring_index(s,',',-x),
trim(substring_index(substring_index(substring_index(s,',',-x),',',1),',',-1)) as w,
x-1 x
from cte1 where s<>'' and x>0
)
select * from cte1
DBFIDDLE
But it's a bit of a problem to determine the real problem you have, which is causing you to ask this question. So this is not an answer, but just a different way of selecting all words from a comma-delimted string.
I am trying to use an attribute from a 2nd table in the trigger of the 1st. To do this I am trying to load that value into a variable and then use it as a comparison.
However whenever I try and test the process the comparison answers false.
DELIMITER $$
create trigger evolve_persona before update on phantom_thieves
for each row begin
set #t := (select tier from persona where pname = old.persona);
if((new.persona != old.persona) and (select cast(#t as unsigned) = '1')) then
set
new.st = old.st+10, new.ma = old.ma+10, new.en= old.en+10, new.ag= old.ag+10,
new.lu= old.lu+20;
end if;
end$$
DELIMITER ;
I can see nothing wrong with your trigger but, this is somewhat more complicated as be written in a comment.
Make please following
SET #t = -1;
SELECT #t; -- returns -1
update phantom_thieves SET .....
SELECT #t; -should display at sometime 1
This seems to be the only problem that tier don't has the response 1 and with above, you can see what you get.
Separating String list and replacing same list with new values in mysql
I have following data in my table_1 Table
table_1(Currently saved structure)
code value
12_A ["A","B","C","D"]
12_B ["E","F","G","H"]
12_3 ["I","J","K","L"]
But each code have different values with different description. like::
code value description
12_A A Apple
12_A B Ball
12_A C Cat
12_A D Dog
12_B E Eagle
12_B F Flag
. . .
. . .
. . .
I have to Separate the value list from table_1 and
need to save again in same table i.e table_1(in this structure)::
code value
12_A ["Apple","Ball","Cat","Dog"]
12_B ["Eagle","Flag",.......]
12_3 [......................]
You can use GROUP_CONCAT() :
UPDATE Table1 s
SET s.value = (SELECT t.code,CONCAT('["',
GROUP_CONCAT(t.description ORDER BY t.description SEPARATOR '","'),
']')
FROM Table_With_val t
WHERE t.code = s.code
AND s.value LIKE CONCAT('%"',t.value,'"%'))
You didn't provide any conclusive information, I assumed the second data sample you provided is an existing table, and table1 is the table you want to update.
NOTE: This is a bad DB structure! it would most defiantly cause problem in the future especially when required to make joins . I strongly advise you to normalize your data and store each description and value in its own record.
you can create a function in which you can pass your string list as parameter in case of your example ["A","B","C","D"] will be the parameter. The function will break down the string and will concatenate the descriptions according. The example of the function you can use is given below:
DELIMITER $$
DROP FUNCTION IF EXISTS codeToDesc$$
CREATE FUNCTION codeToDesc(commaSeperatedCodeList TEXT) RETURNS TEXT CHARSET utf8
BEGIN
DECLARE finalString TEXT;
DECLARE inputCodeList TEXT;
DECLARE codeName VARCHAR(255);
DECLARE codecount BIGINT(5);
SET finalString='';
SET inputCodeList = REPLACE(REPLACE(REPLACE(commaSeperatedCodeList,'[',''),']',''),'"','');
DROP TEMPORARY TABLE IF EXISTS test.code_table;
DROP TEMPORARY TABLE IF EXISTS test.code_count;
CREATE TEMPORARY TABLE test.code_table (CODE VARCHAR(255));
CREATE TEMPORARY TABLE test.code_count (countNo BIGINT(11));
INSERT INTO test.code_count(countNo) SELECT(LENGTH(inputCodeList)-LENGTH(REPLACE(inputCodeList,',','')) + 1);
BEGIN
DECLARE table_cursor CURSOR FOR SELECT countNo FROM test.code_count;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET codecount = (SELECT countNo FROM test.code_count ORDER BY countNo ASC LIMIT 1);
OPEN table_cursor;
readLoop1: LOOP
FETCH table_cursor INTO codecount;
IF codecount=0 THEN
LEAVE readLoop1;
END IF;
SET codeName=(SELECT SUBSTRING_INDEX(inputCodeList,',',1));
INSERT INTO test.code_table(CODE) SELECT codeName;
SET inputCodeList=(SELECT TRIM(BOTH ',' FROM REPLACE(inputCodeList,codeName,'')));
INSERT INTO test.code_count(countNo) SELECT codecount-1;
SET codeName='';
END LOOP;
CLOSE table_cursor;
END;
-- use your code and description here, i guess those should be fixed
SELECT CONCAT('["',REPLACE(GROUP_CONCAT(CASE WHEN CODE='A' THEN 'Apple'
WHEN CODE = 'B' THEN 'Ball'
WHEN CODE = 'C' THEN 'Cat'
WHEN CODE = 'D' THEN 'Dog'
ELSE '' END),',','","'),'"]') INTO finalString FROM test.code_table;
RETURN finalString;
END$$
DELIMITER ;
Try this, let me know if you any issue occurred.
I wrote a function to generate unique id's,its working but sometimes two people are getting same id,I mean duplicates are formed. My unique id looks like
2016-17NLR250001, I deal with only last four digits 0001. I am posting my function please correct it and please help me in avoiding duplicates even though users login into same account or if they do it on same time.
MY FUNCTION:
DELIMITER $$
USE `olmsap`$$
DROP FUNCTION IF EXISTS `fun_generate_uniqueid`$$
CREATE DEFINER=`root`#`%` FUNCTION `fun_generate_uniqueid`( V_DATE DATE,V_MANDALID INT ) RETURNS VARCHAR(30) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE MDLCODE VARCHAR(5);
SET MDLCODE = ' ';
SELECT COUNT(*) INTO #CNT FROM `st_com_mandal` WHERE MANDAL_VS_MC=V_MANDALID;
SELECT dist_mandal_code INTO MDLCODE FROM `st_com_mandal` WHERE MANDAL_VS_MC=V_MANDALID;
IF #CNT>0 THEN
SET #YR=`FUN_FISCAL_YR`(V_DATE);
SELECT CONCAT(IF(DIST_SAN_CODE='GUN','GNT',DIST_SAN_CODE),IFNULL(`dist_mandal_code`,'NULL'))INTO #MANDAL
FROM `st_com_dist` SCD INNER JOIN `st_com_mandal` STM ON STM.`mandal_dist_id`= SCD.`DIST_VC_DC` WHERE MANDAL_VS_MC=V_MANDALID;
IF MDLCODE >0 THEN
SELECT COUNT(Soil_Sample_ID)+1 INTO #ID FROM `tt_mao_soil_sample_dtls` WHERE MANDAL_ID=V_MANDALID AND SUBSTR(UNIQUE_ID,1,7)=#YR ;
ELSE
SELECT COUNT(Soil_Sample_ID)+1 INTO #ID FROM `tt_mao_soil_sample_dtls` WHERE SUBSTR(UNIQUE_ID,1,14)=CONCAT(#YR,#MANDAL) ;
END IF ;
IF LENGTH(#ID)=1 THEN
SET #ID=CONCAT('000',#ID);
ELSEIF LENGTH(#ID)=2 THEN
SET #ID=CONCAT('00',#ID);
ELSEIF LENGTH(#ID)=3 THEN
SET #ID=CONCAT('0',#ID);
ELSE
SET #ID=#ID;
END IF ;
RETURN CONCAT(#YR,#MANDAL,#ID);
ELSE
RETURN 'Mandal Doesnt Exists';
END IF;
END$$
DELIMITER ;
I do not think community will be able to help you with this question. This is a complex function that requires very careful analysis of table / index access and locking.
The only thing I can recommend is to not use existing table data to calculate next sequence as this is a bad practice.
Besides Race conditions that you are experiencing you will also get problems if the record with the last sequence is deleted.
I suggest you read this to get an idea on how to write a custom sequence generator:
http://en.latindevelopers.com/ivancp/2012/custom-auto-increment-values/
Basically I am trying to refer to my table in mysql function, so that in my query I can say "from x" as in x is a parameter of the function, so that someone can put in the table they want the function to run on.
CREATE DEFINER=`root`#`localhost` FUNCTION `somefunction`(t varchar(8), num integer) RETURNS int(8)
BEGIN
DECLARE result integer(12);
DECLARE test varchar(12);
SET result = 0;
SET test = t;
select integer * 5 INTO result from x;
return result;
END
Basically when I do somefunction(thisisthetableiwant, 5) I get an error saying that it cannot find 'test in field list' so it isn't setting the table to what I put in the parameter, currently I have the part "from x" hardcoded with the table I want and it works but I need to make it so I can have a parameter incase I need to use the function on another table