SQL server Trigger no working - sql
I create this trigger, and this select:
SELECT #registro=seccion
FROM dbo.horarios
WHERE materia=#materia
AND seccion=#seccionselect
is not working. This link states that: if the value is not returned from select, previous assign value will be kept. But the record matching this criteria is not found it is returning new data. In the bottom is the output and database values.
CREATE TRIGGER tgr_insertOnHorarios on horarios
AFTER INSERT
AS
BEGIN
DECLARE #materia varchar(7),#aula int,#profesor varchar(7), #seccion varchar(2),#dia varchar(10),
#hora_desde time, #hora_hasta time, #cantidad int, #errores varchar(300), #displayError bit,#registro nchar(10)
SELECT #materia= i.materia FROM inserted i;
SELECT #profesor=i.profesor FROM inserted i;
SELECT #seccion=i.seccion FROM inserted i;
SELECT #dia= i.dia FROM inserted i;
SELECT #hora_desde=i.hora_desde FROM inserted i;
SELECT #hora_hasta= i.hora_hasta FROM inserted i;
SELECT #cantidad= i.cantidad FROM inserted i;
SELECT #aula = i.aula FROM inserted i;
IF (SELECT cantidad_alumnos FROM aulas WHERE codigo=#aula)<#cantidad
BEGIN
SET #errores= 'Contiene mas estudiantes de los permitidos en el aula,'
PRINT #errores
--RAISERROR (#errores,16,1);
ROLLBACK TRANSACTION;
RETURN
END
print #seccion
print #materia
***set #registro='empty'***
print 'registro '+ #registro
**SELECT #registro=seccion FROM dbo.horarios WHERE materia=#materia AND seccion=#seccion**
**print 'registro '+#registro**
IF #registro = #seccion
BEGIN
SET #errores= ' La seccion y la materia ya esta creada, por favor, haga una nueva seccion'
PRINT #errores
--RAISERROR (#errores,16,1);
ROLLBACK TRANSACTION;
RETURN
END
--------------------------------------------
SELECT #registro=profesor FROM horarios WHERE dia=#dia AND hora_desde=#hora_desde AND #hora_hasta=hora_desde AND profesor=#profesor
If #registro IS NOT NULL
BEGIN
SET #errores=' el profesor ya esta asignado en este horario'
PRINT #errores
--RAISERROR (#errores,16,1);
ROLLBACK TRANSACTION;
RETURN
END
--------------------------------------------
declare #dayassig varchar(10),#desde time,#hasta time
SELECT #registro=profesor, #dayassig=dia,#desde=hora_desde,#hasta=hora_hasta FROM horarios WHERE
#dayassig=#dia and
((#desde<=#hora_desde and #hasta>#hora_desde) OR
(#desde<#hora_hasta and #hasta>=#hora_hasta))
IF #registro IS NOT NULL
BEGIN
SET #errores= #errores+' este horario choca'
PRINT #errores
--RAISERROR (#errores,16,1);
ROLLBACK TRANSACTION;
RETURN
END
END
[output]
03 (printing input on insert seccion)
CCI-110 (printing input on insert materia)
registro **empty** (before select)
registro **03** (after select, should not be returning this)
La seccion y la materia ya esta creada, por favor, haga una nueva seccion
[database values]
materia aula profesor seccion dia hora_desde hora_hasta cantidad
CCI-110 501 7722 01 miercoles 12:00:00.0000000 15:00:00.0000000 25
CCI-110 501 7722 01 miercoles 12:00:00.0000000 16:00:00.0000000 25
CCI-110 501 7722 01 miercoles 14:00:00.0000000 16:00:00.0000000 25
How you can see not record matching input seccion 03 andmateria CCI-110, but on [output is printing on register 03]?
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Pascal sum calculator
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Recursive query to give a route in postgreSQL
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Here I leave the solution I've get finally: with recursive caminos(from_city_name, to_city_name, path, total_distance, terminar, ultima_ciudad) as ( -- Consulta base select to_city_name ,'Saint Jean Pied de Port' -- Cambiar Destino ,concat(to_city_name, concat(' -> ', from_city_name)) ,cast(km_distance_num as numeric(8,2)) ,0 --No terminar ,from_city_name from textil.tb_route where to_city_name = 'Santiago de Compostela' -- Cambiar Origen union all -- Consulta recursiva select caminos.from_city_name ,caminos.to_city_name ,concat(caminos.path, concat( ' -> ', tr.from_city_name)) ,cast(caminos.total_distance + tr.km_distance_num as numeric(8,2)) ,case when tr.from_city_name = caminos.to_city_name then 1 else 0 end ,tr.from_city_name from caminos inner join textil.tb_route tr on tr.to_city_name = caminos.ultima_ciudad and caminos.terminar != 1 ) select from_city_name, to_city_name, path, total_distance from caminos where 1 = 1 and from_city_name = 'Santiago de Compostela' --Cambiar Origen and ultima_ciudad = 'Saint Jean Pied de Port' -- Cambiar Destino ;
I understand your question as a graph-walking problem. As described in your questions, edges are directed (meaning that you can travel from from_city_name to to_city_name, but not the other way around). Here is an approach using a recursive CTE. The idea is to start from a given city, and then follow all possible routes, while keeping track of the overall travel path in an arry. The recursion stops either when a circle is detected, or when the target city is reached. Then, the outer query filters on the successful paths (there may be none, one or several). with recursive cte as ( select from_city_name, to_city_name, km_distance_num, array[from_city_name::text, to_city_name::text] path from tb_route where from_city_name = 'Saint Jean Pied de Port' union all select r.from_city_name, r.to_city_name, c.km_distance_num + r.km_distance_num, c.path || r.to_city_name::text from tb_route r inner join cte c on c.to_city_name = r.from_city_name where not r.to_city_name = any(c.path) and c.from_city_name <> 'Santiago de Compostela' ) select path[1] from_city_name, to_city_name, km_distance_num, array_to_string(path, ' > ') path from cte where to_city_name = 'Santiago de Compostela'; Demo on DB Fiddle: from_city_name | to_city_name | km_distance_num | path :---------------------- | :--------------------- | --------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Saint Jean Pied de Port | Santiago de Compostela | 775.3 | Saint Jean Pied de Port > Roncesvalles > Zubiri > Pamplona/Iruña > Puente la Reina/Gares > Estella/Lizarra > Torres del Río > Logroño > Nájera > Santo Domingo de la Calzada > Belorado > Agés > Burgos > Hontanas > Boadilla del Camino > Carrión de los Condes > Terradillos de los Templarios > El Burgo Ranero > León > San Martín del Camino > Astorga > Foncebadón > Ponferrada > Villafranca del Bierzo > O Cebreiro > Triacastela > Sarria > Portomarín > Palas de Rei > Arzúa > Pedrouzo > Santiago de Compostela
How can I use the IF in Firebird with a stored procedure?
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Your if is syntactically wrong for what I think you want to do. The indentation of the following suggests that all those statements should depend on the if condition: if (TIPO_DOC = 'DEV') then total_neto = -total_neto ; total_impuesto = -total_impuesto ; total = -total ; costo = -costo ; precio = -precio; In reality only the first statement after the if belongs to the if condition. In other words, it is actually if (TIPO_DOC = 'DEV') then total_neto = -total_neto ; total_impuesto = -total_impuesto ; total = -total ; costo = -costo ; precio = -precio; If you want all those statements to depend on the if, you need to define a block using begin and end: if (TIPO_DOC = 'DEV') then begin total_neto = -total_neto ; total_impuesto = -total_impuesto ; total = -total ; costo = -costo ; precio = -precio; end See also IF ... THEN ... ELSE in the Firebird 2.5 Language Reference.
Not an answer, just an advice, using syntactic highlighting. FOR SELECT .... do if (TIPO_DOC = 'DEV') then total_neto = -total_neto ; total_impuesto = -total_impuesto ; total = -total ; costo = -costo ; precio = -precio; This code has few problems with me. If within loop - often it may slow down execution. So if IF condition is not dependent upon loop data - if it is invariant - it might make sense to move If outside of loop. Future compatibility - what would you procedure do if for example TIPO_DOCUMENTO = 'BE-BE-BE'? Should not happen today? But it can happen tomorrow as new functions would be added to the program. It even can happen today because of some bug. Personally i would do it different way: DECLARE VARIABLE COEFF SMALLINT; .... COEFF = CASE TIPO_DOC WHEN 'DEV' THEN -1 WHEN 'FAC' THEN +1 ELSE :COEFF / 0 /* generate error if prohibited value */ END; -- shorthand -- COEFF = DECODE( TIPO_DOC, 'DEV',-1, 'FAC',+1, :COEFF / 0 ); FOR SELECT.... DO total_neto = COEFF*total_neto ; total_impuesto = COEFF*total_impuesto; .... More strange things: P_VENDEDOR_DESDE = ''; - thus this variable is some text type, like VarChar or CHAR or BLOB SUB_TYPE TEXT. Then why VEN.VENDEDOR_CODIGO BETWEEN '''||P_VENDEDOR_DESDE||''' AND '''||P_VENDEDOR_HASTA||''' ??? Why not just VEN.VENDEDOR_CODIGO BETWEEN P_VENDEDOR_DESDE AND P_VENDEDOR_HASTA ?