I've made this function but no matter what I add (delimiters) it's still throwing the same error.
CREATE FUNCTION getNumberOfBuyers(IN userId INT) RETURNS INT
BEGIN
DECLARE numberOfBuyers INT DEFAULT 0;
SELECT COUNT(*) INTO numberOfBuyers FROM buyers WHERE id = userId;
RETURN numberOfBuyers;
END;
The error is:
[42000][1064] You have an error in your SQL syntax; check the manual
that corresponds to your MariaDB server version for the right syntax
to use near 'IN userId INT) RETURNS INT BEGIN DECLARE numberOfBuyers
INT DEFAULT 0; ...' at line 1
There is no possibility to mark parameter as input parameter in mariadb. So remove the IN in the declaration:
CREATE FUNCTION getNumberOfBuyers(userId INT) RETURNS INT
BEGIN
DECLARE numberOfBuyers INT DEFAULT 0;
SELECT COUNT(*) INTO numberOfBuyers FROM buyers WHERE id = userId;
RETURN numberOfBuyers;
END;
The general syntax declaration looks like:
CREATE FUNCTION function_name [ (parameter datatype [, parameter datatype]) ]
RETURNS return_datatype
BEGIN
declaration_section
executable_section
END;
Related
i want to get count of no.of rows present in table which i pass at runtime to a function.
i have created a procedure and function to execute dynamic queries. function will not allow dynamic query because i am calling procedure from function.
that procedure having dynamic query.
///////procedure///////
CREATE PROCEDURE bizopsgolddev.`test1`(tbnm varchar(100))
begin
declare sql_text varchar(200);
DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN
SELECT CONCAT(sql_text, ' is not valid');
END;
set sql_text=concat('select count(*) from ',tbnm);
SET #SQL := sql_text;
PREPARE stmt FROM #SQL;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
end;
//////function//////
DROP FUNCTION IF EXISTS xyz;
CREATE FUNCTION `xyz`(tname varchar(100)) RETURNS int(11)
begin
declare val int;
call test1(tname);
return 1;
end;
if i execute this //select xyz('axpdc')// it should return rows count
can any one tell me how can i get count by passing table name to function(in mariadb only)
As I understand the question, the solution would be a function that returns the row count of a table with it's name passed to the function as a parameter.
I think this could be done by querying the information_schema database in MariaDB. A function could look like this:
CREATE DEFINER = 'yourUsername'#'192.168.%'
FUNCTION testDataBase.fn_GetRowCount(tableName VARCHAR(128))
RETURNS int(11)
BEGIN
-- This could be a parameter if need it to be.
DECLARE databaseName varchar(40) DEFAULT 'testDataBase';
DECLARE result int DEFAULT -1;
SELECT t.TABLE_ROWS INTO result
FROM information_schema.TABLES t
WHERE t.TABLE_NAME = tableName
AND t.TABLE_SCHEMA = databaseName;
RETURN result;
END
In order for this to work the user mentioned as the definer must have read privilege to the TABLES table in the information_schema database, otherwise you might get an error (tbh, I don't know if this is necessary).
There is a lot of useful information to be grabbed from the information_schema database.
I am using mariadb 10.3.9, and have created a user defined aggregate function (UDAF) and placed in a common_schema. This schema contains my utility functions to be used by other schema/databases on the same server.
The issue is that when calling the UDAF while using any other schema, it always return NULL!
The following is to demonstrate the issue:
CREATE SCHEMA IF NOT EXISTS common_schema;
DELIMITER $$
DROP FUNCTION IF EXISTS common_schema.add_ints $$
CREATE FUNCTION common_schema.add_ints(int_1 INT, int_2 INT) RETURNS INT NO SQL
BEGIN
RETURN int_1 + int_2;
END $$
DROP FUNCTION IF EXISTS common_schema.sum_ints $$
CREATE AGGREGATE FUNCTION common_schema.sum_ints(int_val INT) RETURNS INT
BEGIN
DECLARE result INT DEFAULT 0;
DECLARE CONTINUE HANDLER FOR NOT FOUND RETURN result;
LOOP FETCH GROUP NEXT ROW;
SET result = common_schema.add_ints(result, int_val);
END LOOP;
END $$
DELIMITER ;
Now, calling it this way, returns the result as expected:
USE common_schema;
SELECT common_schema.sum_ints(seq)
FROM (SELECT 1 seq UNION ALL SELECT 2) t;
-- result: 3
Calling it using any other schema, it returns NULL:
USE other_schema;
SELECT common_schema.sum_ints(seq)
FROM (SELECT 1 seq UNION ALL SELECT 2) t;
-- result: null
Am I missing something here? Is there any configuration that is missing?
Appreciate your help.
Reported as a Bug https://jira.mariadb.org/browse/MDEV-18100.
As a workaround, create the UDAF in every schema.
I have an table contain three columns ID,Obj_name,Object in a table. Object refers to metadata/File which is located in folder. How can write a script to check what is the file size of each object.
Output like
ID,Obj_name,Object,File_size.
let me know if there is any idea.
Try this :
DECLARE
v_fexists BOOLEAN;
v_file_length NUMBER;
v_block_size BINARY_INTEGER;
BEGIN
UTL_FILE.FGETATTR
('NFS_DIR', 'west.txt', v_fexists, v_file_length,
v_block_size);
DBMS_OUTPUT.PUT_LINE (v_file_length);
END;
Since object is a bfile, you can do something like
CREATE OR REPLACE FUNCTION( p_id IN INTEGER )
RETURN INTEGER
IS
l_bfile bfile;
l_length integer;
BEGIN
SELECT object
INTO l_bfile
FROM your_table
WHERE id = p_id;
DBMS_LOB.OPEN(l_bfile, DBMS_LOB.LOB_READONLY);
/* Get the length of the LOB: */
l_length := DBMS_LOB.GETLENGTH(l_bfile);
DBMS_LOB.CLOSE(l_bfile);
RETURN l_length;
END;
and then call that function from your query passing in the id. Note that this example is taken directly from the documentation on LOBs
CREATE OR REPLACE FUNCTION InsertInformation
(
p_Name varchar(20)
,p_Address varchar(250)
,p_Mobile int
) RETURNS VOID
as $$
begin
declare v_ID int;
BEGIN
select coalesce(max(Id),0) into v_ID from Information
set; v_ID=v_ID+1
insert into Information
(
Id
,Name
,Address
,Mobile
)
values
(
v_ID
,p_Name
,p_Address
,p_Mobile
)
select v_ID;
$$
LANGUAGE plpgsql;
I convert my sql insert sp to Postgres function using online converter tool but it showing the below mention error
error showing : ERROR: syntax error at or near "insert"
LINE 16: insert into Information
This:
select coalesce(max(Id),0) into v_ID from Information
set; v_ID=v_ID+1
Is wrong.
The select isn't properly terminated, and the set itself is illegal syntax.
You probably want this:
select coalesce(max(Id),0)
into v_ID
from Information; --<< terminate with a ; here
v_id := v_id + 1; --<< terminate with a ; here
But the extra assignment isn't necessary in the first place. The above can be shortened to:
select coalesce(max(Id),0) + 1
into v_ID
from Information;
This
select v_ID;
is also wrong. To return a value use:
return v_id;
But your function is defined as returns void so you can't return anything in the first place.
But: using select coalesce(max(Id),0) + 1 to generate unique IDs is wrong and will not work correctly in a real world application.
The only correct, scalable and fast way to generate new ids is to use a sequence. Really.
The complete function (if you want to return the newly "generated" id) would look like this:
CREATE OR REPLACE FUNCTION InsertInformation(p_Name varchar(20),p_Address varchar(250),p_Mobile int)
RETURNS integer
as
$$
declare
v_ID int;
BEGIN
select coalesce(max(Id),0) + 1
into v_ID
from Information;
INSERT INTO information
(id, name, address, mobile)
VALUES
(v_id, p_name, p_address, p_mobile);
return v_id;
END;
$$
LANGUAGE plpgsql;
SQLFiddle example: http://sqlfiddle.com/#!15/4ac27/1
I want to create a function that returns the number of rows in a table called Rating with a where clause.Where am i going wrong before the declare statement and the end statement?
create or replace
FUNCTION get_movies(user IN NUMBER) RETURN NUMBER
IS
DECLARE cnt NUMBER;
BEGIN
SELECT count(*)
INTO cnt
FROM rating
where userid= user;
RETURN cnt;
END;
I will appreciate help.Thanks.
You should not have the DECLARE keyword. You only need that for an anonymous block (or a sub-block).
create or replace
FUNCTION get_movies(p_userid IN NUMBER) RETURN NUMBER
IS
cnt NUMBER;
BEGIN
...
user is a reserved word so I'd suggest not using that as your parameter name. In the where clause I'm not sure if it will use your parameter value, or the name of the user executing the function; which would error as that string value couldn't be implicitly converted to a number.