I have a procedure that receives 2 parameters I would like to take the last character of one of these parameters does anyone know how to do, using mysql?
CREATE PROCEDURE `sp_status`(IN status_p CHAR(1), IN codigo_p VARCHAR(255))
BEGIN
UPDATE cartaodigital SET statusPedido = status_p WHERE id_cartaodigital = codigo_p;
END
The function you are looking for is SUBSTRING:
select substring(COLUMNNAME from length(COLUMNNAME))
from TABLENAME;
or
select substring(COLUMNNAME, length(COLUMNNAME))
from TABLENAME;
or
select substring(COLUMNNAME from -1)
from TABLENAME;
or
select substring(COLUMNNAME, -1)
from TABLENAME;
Related
I have a simple mysql procedure which must return an query string. But, it returns almost every time QueryResult (column name) as <null> value.
create procedure return_table_rename_query(
IN targetTable VARCHAR(100),
IN tblPrefix VARCHAR(100)
)
BEGIN
SET #returnQuery = CONCAT('SELECT "MYSQLIMPORT can not rename table for target ', #targetTable, '";');
SET #totalRows = (SELECT COUNT(*) FROM table);
if IFNULL(#totalRows, 0) > 0
then
SET #returnQuery = CONCAT('drop table if exists table_name.', ...);
end if;
SELECT #returnQuery AS 'QueryResult';
end;
#targettable is not the same variable as targettable - you are mixing user defined variables and parameter variables and it seems likely that #targettable is null and if any element in a concat is null then the result is null.
Please read How to declare a variable in MySQL?
I'm trying to update a column (in this case, a date) that is present on most of the tables on my database. Sadly, my database has more than 100 tables already created and full of information. Is there any way to loop through them and just use:
UPDATE SET date = '2016-04-20' WHERE name = 'Example'
on the loop?
One painless option would be to create a query which generates the UPDATE statements you want to run on all the tables:
SELECT CONCAT('UPDATE ', a.table_name, ' SET date = "2016-04-20" WHERE name = "Example";')
FROM information_schema.tables a
WHERE a.table_schema = 'YourDBNameHere'
You can copy the output from this query, paste it in the query editor, and run it.
Update:
As #PaulSpiegel pointed out, the above solution might be inconvenient if one be using an editor such as HeidiSQL, because it would require manually copying each record in the result set. Employing a trick using GROUP_CONCAT() would give a single string containing every desired UPDATE query in it:
SELECT GROUP_CONCAT(t.query SEPARATOR '; ')
FROM
(
SELECT CONCAT('UPDATE ', a.table_name,
' SET date = "2016-04-20" WHERE name = "Example";') AS query,
'1' AS id
FROM information_schema.tables a
WHERE a.table_schema = 'YourDBNameHere'
) t
GROUP BY t.id
You can use SHOW TABLES command to list all tables in database. Next you can check if column presented in table with SHOW COLUMNS command. It can be used this way:
SHOW COLUMNS FROM `table_name` LIKE `column_name`
If this query returns result, then column exists and you can perform UPDATE query on it.
Update
You can check this procedure on sqlfiddle.
CREATE PROCEDURE UpdateTables (IN WhereColumn VARCHAR(10),
IN WhereValue VARCHAR(10),
IN UpdateColumn VARCHAR(10),
IN UpdateValue VARCHAR(10))
BEGIN
DECLARE Finished BOOL DEFAULT FALSE;
DECLARE TableName VARCHAR(10);
DECLARE TablesCursor CURSOR FOR
SELECT c1.TABLE_NAME
FROM INFORMATION_SCHEMA.COLUMNS c1
JOIN INFORMATION_SCHEMA.COLUMNS c2 ON (c1.TABLE_SCHEMA = c2.TABLE_SCHEMA AND c1.TABLE_NAME = c2.TABLE_NAME)
WHERE c1.TABLE_SCHEMA = DATABASE()
AND c1.COLUMN_NAME = WhereColumn
AND c2.COLUMN_NAME = UpdateColumn;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET Finished = TRUE;
OPEN TablesCursor;
MainLoop: LOOP
FETCH TablesCursor INTO TableName;
IF Finished THEN
LEAVE MainLoop;
END IF;
SET #queryText = CONCAT('UPDATE ', TableName, ' SET ', UpdateColumn, '=', QUOTE(UpdateValue), ' WHERE ', WhereColumn, '=', QUOTE(WhereValue));
PREPARE updateQuery FROM #queryText;
EXECUTE updateQuery;
DEALLOCATE PREPARE updateQuery;
END LOOP;
CLOSE TablesCursor;
END
This is just an example how to iterate through all tables in database and perform some action with them. Procedure can be changed according to your needs.
Assuming you are using MySQL, You can use Stored Procedure.
This post is a very helpful.
Mysql-loop-through-tables
Example: I have a table with 5 fields, named id, field_1, field_2, field_3, field_4
And I am searching for 'foo' across all fields.
SELECT ID FROM table WHERE field_1 LIKE ('%foo%') OR field_2 LIKE ('%foo%') OR ...
I'd like to return the IDs, as well as which fields the term was found in.
What would be the most efficient way to do this?
Note: I am looking for a solution that could dynamically accommodate adding new DB fields, without having to manually update the SQL.
One possible approach is to map these matches in returned columns:
SELECT ID,
field_1 LIKE '%foo%' AS field_1_match,
field_2 LIKE '%foo%' AS field_2_match
...
... so you can just check each corresponding column_match value to know, well, was it matched or not.
It's easy to extend this into returning a string with columns (separated by ,, for example) with CONCAT_WS:
SELECT ID,
CONCAT_WS(',',
IF(field_1 LIKE '%foo%', 'field_1', NULL),
IF(field_2 LIKE '%foo%', 'field_2', NULL)
...
)
... but, honestly speaking, I doubt it'll be easier to process data formatted this way.
Use unions:
SELECT id, 'field_1' as 'fieldName' FROM table WHERE field1 LIKE '%foo%' UNION
SELECT id, 'field_2' as 'fieldName' FROM table WHERE field2 LIKE '%foo%' UNION
...
This will return the id and column name wherever it is found. If it happens multiple times on the same row, multiple results will be returned for that row.
Updated:
It is possible to dynamically search all of the tables using a stored procedure and a cursor.
DELIMITER //
CREATE PROCEDURE search_all_fields(IN search VARCHAR(100), IN tableName VARCHAR(100), IN idColumnName VARCHAR(100))
BEGIN
DECLARE sqlQuery VARCHAR(200);
DECLARE done INT DEFAULT 0;
DECLARE columnName VARCHAR(30);
DECLARE cur CURSOR FOR SELECT `COLUMN_NAME` FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE `TABLE_NAME`= tableName; # cursor will iterate over the column names
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
CREATE TEMPORARY TABLE temp ( id VARCHAR(100), FieldName VARCHAR(100) ); # procedure returns multiple result sets, so we'll dump them in a temp table and get them at the end
OPEN cur;
read_loop: LOOP # iterates through column names
FETCH cur INTO columnName;
IF done THEN
LEAVE read_loop;
END IF;
# execute search
SET #sqlQuery = CONCAT("INSERT INTO temp SELECT ", idColumnName, ", '", columnName, "' as 'FieldName' FROM ", tableName, " WHERE ", columnName, " LIKE '%", search, "%'");
PREPARE stmt FROM #sqlQuery;
EXECUTE stmt;
END LOOP;
CLOSE cur;
# grab the results
SELECT * FROM temp;
END;//
DELIMITER ;
MY Table like this:
id Tag platform
1 #class1,#class2 CS
2 #class1 PS
3 #class2 CS
if i pass "'#class1'" as parameter to SP getting only one record that is 2nd record.But need to 1st and 2nd records because #class1 contains in both 1,2 rows.Please tell me how to write this.I am using IN statement as of now.By using getting only record.
MY SP:
ALTER PROCEDURE [dbo].[usp_Get]-- 1,"'#class1,#class2'"
#Appid INT,
#TagList NVARCHAR (MAX)
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
SELECT #TagList = '%' + RTRIM(LTRIM(#TagList)) + '%';
declare #tags varchar(MAX)
set #tags = #TagList
create table #t (tag varchar(MAX))
set #tags = 'insert #t select ' + replace(#tags, ',', ' union select ')
exec(#tags)
Select
id FROM dbo.List WHERE ((appid=#Appid)) AND ((Tags LIKE(select tag from #t)
END
How to modify please tell me...
Thanks in advance..
One solution would be to use LIKE operator in your stored procedure:
CREATE PROCEDURE FindTag #TagName char(50)
AS
SELECT #TagName = '%' + TRIM(#TagName) + '%';
SELECT Tag
FROM MyTable
WHERE Tag LIKE #TagName;
GO
I have a table called webqueries with a column named qQuestion of data type text(sql server 2008). I want to create a count on words used in qQuestion (excluding 'and', 'is' etc). My goal is to see how many times a person has asked a question about a specific product.
You could create a table-valued function to parse words and join it to your query against qQuestion. In your schema, I recommend using varchar(8000) or varchar(max) instead of text. Meanwhile, the following should get you started:
create function [dbo].[fnParseWords](#str varchar(max), #delimiter varchar(30)='%[^a-zA-Z0-9\_]%')
returns #result table(word varchar(max))
begin
if left(#delimiter,1)<>'%' set #delimiter='%'+#delimiter;
if right(#delimiter,1)<>'%' set #delimiter+='%';
set #str=rtrim(#str);
declare #pi int=PATINDEX(#delimiter,#str);
while #pi>0 begin
insert into #result select LEFT(#str,#pi-1) where #pi>1;
set #str=RIGHT(#str,len(#str)-#pi);
set #pi=PATINDEX(#delimiter,#str);
end
insert into #result select #str where LEN(#str)>0;
return;
end
go
select COUNT(*)
from webqueries q
cross apply dbo.fnParseWords(cast(q.qQuestion as varchar(max)),default) pw
where pw.word not in ('and','is','a','the'/* plus whatever else you need to exclude */)