0

首先，对不起我的英语不好。

我正在创建一个使用 PostgreSQL 9.2 的新应用程序。我正在尝试使用 Firebird 中使用的相同“逻辑”，但显然不适用于 PostgreSQL。

我有一个名为“Albaran”的表 Master 和一个名为“AlbaMov”的其他详细表。我已经定义了一些具有相应职责的触发器，当您修改 Detail 表中的记录时，Master 表会更新这些触发器。除非我想删除主表中的记录，否则一切正常。

当您删除 Master 表中的记录时，会从 Detail 中删除所有记录，并且我将 Master 表中的“Total”字段更新为 0，但不会删除 Master 表记录。如果我从 Master 表中删除了没有 Detail 表中的记录的记录，则可以顺利删除。

我一直在测试并发现问题出在对主表的更新是在我称为 CalculoAlbaranVenta 的函数中完成的。

同样的系统在 Firebird 中也能完美运行。

这个函数返回一个%ROWTYPE 类型的变量，我用它来更新一个PHP 屏幕。

在这里，我保留了带有触发器和函数的表的定义。

问题可能出在哪里？

提前问候和感谢。

CREATE OR REPLACE FUNCTION public."CalculoAlbaranVenta"
(
  IN  "cSerie"      public."Serie",
  IN  "nNumeroDoc"  public."NumeroDocumento"
)
RETURNS SETOF public."Totales" AS
$$
declare nBasImp "Importes";
declare nIva "Importes";
declare nRE "Importes";
declare nTotalBase "Importes";
declare nTotalIVA "Importes";
declare nTotalRE "Importes";
declare nTotalDtoBase "Importes";
declare nTotalDtoResto "Importes";
declare nTotalDtos "Importes";
declare nTotalLinea "Importes";
declare rRow RECORD;
declare rTotales "Totales"%ROWTYPE;

begin
  nBasImp        := 0;
  nIva           := 0;
  nRE            := 0;
  nTotalBase     := 0;
  nTotalIVA      := 0;
  nTotalRE       := 0;
  nTotalDtoBase  := 0;
  nTotalDtoResto := 0;
  nTotalDtos     := 0;
  nTotalLinea    := 0;

  FOR rRow IN SELECT "TotalUnidades", 
                     "Precio", 
                     "PorcentajeIVA", 
                     "PorcentajeRE", 
                     "DescuentoBase", 
                     "DescuentoResto"
              FROM "AlbaMov"
              WHERE ("Serie" = "cSerie") AND ("NumeroDoc" = "nNumeroDoc") AND
                    ("Referencia" IS NOT NULL)
  LOOP
    nTotalLinea    := Round((rRow."TotalUnidades" * rRow."Precio")::numeric, 3);
    nTotalDtoBase  := Round((nTotalLinea * (rRow."DescuentoBase" / 100))::numeric, 3);
    nTotalLinea    := nTotalLinea - nTotalDtoBase; 
    nTotalDtoResto := Round((nTotalLinea * (rRow."DescuentoResto" / 100))::numeric, 3);
    nTotalLinea    := nTotalLinea - nTotalDtoResto;
    nTotalDtos     := nTotalDtos + nTotalDtoBase + nTotalDtoResto; 

    nBasImp := Round(nTotalLinea::numeric, 2);

    nTotalBase := nTotalBase + nBasImp;
    nTotalIVA  := nTotalIVA  + (nBasImp * rRow."PorcentajeIVA" / 100);
    nTotalRE   := nTotalRE   + (nBasImp * rRow."PorcentajeRE" / 100);

  END LOOP;

  nTotalIVA  := Round(nTotalIVA::numeric, 2);
  nTotalRE   := Round(nTotalRE::numeric, 2);
  nTotalDtos := Round(nTotalDtos::numeric, 2);

  UPDATE "Albaran"
  SET "BaseImponible" = nTotalBase,
      "TotalDescuentos" = nTotalDtos,
      "IVA" = nTotalIVA,
      "RE" = nTotalRE,
      "Total" = nTotalBase + nTotalIVA + nTotalRE
  WHERE ("Serie" = "cSerie") AND ("NumeroDoc" = "nNumeroDoc");

  rTotales."TotalDescuentos" := nTotalDtos;
  rTotales."BaseImponible"   := nTotalBase;
  rTotales."TotalIVA"        := nTotalIVA;
  rTotales."TotalRE"         := nTotalRE;
  rTotales."Total"           := nTotalBase + nTotalIVA + nTotalRE;

  RETURN NEXT rTotales;

end
$$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 1;

CREATE OR REPLACE FUNCTION public."AlbaranBeforeDelete"()
RETURNS trigger AS
$$
begin
  DELETE FROM "AlbaMov"
  WHERE ("Serie" = OLD."Serie") AND ("NumeroDoc" = OLD."NumeroDoc");

  RETURN OLD;
end
$$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;

CREATE OR REPLACE FUNCTION public."AlbaranBeforeUpdate"()
RETURNS trigger AS
$$
begin

  NEW."Total" := Round((NEW."BaseImponible" + NEW."IVA" + NEW."RE")::numeric, 2);

  RETURN NEW;

end
$$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;

CREATE OR REPLACE FUNCTION public."AlbaMovAfterDelete"()
RETURNS trigger AS
$$
declare nTotalBase "Importes";
declare nTotalIVA "Importes";
declare nTotalRE "Importes";
declare nTotalDtoBase "Importes";
declare nTotalDtoResto "Importes";
declare nTotalDtos "Importes";
declare nTotalLinea "Importes";
declare cCliente "CodigoCliente";

begin
  PERFORM "CalculoAlbaranVenta"(OLD."Serie", OLD."NumeroDoc");

  nTotalLinea    := Round((OLD."TotalUnidades" * OLD."Precio")::numeric, 3);
  nTotalDtoBase  := Round((nTotalLinea * (OLD."DescuentoBase" / 100))::numeric, 3);
  nTotalLinea    := nTotalLinea - nTotalDtoBase; 
  nTotalDtoResto := Round((nTotalLinea * (OLD."DescuentoResto" / 100))::numeric, 3);
  nTotalLinea    := nTotalLinea - nTotalDtoResto;
  nTotalDtos     := nTotalDtos + nTotalDtoBase + nTotalDtoResto; 

  nTotalBase := Round(nTotalLinea::numeric, 2);
  nTotalIVA  := (nTotalBase * OLD."PorcentajeIVA" / 100);
  nTotalRE   := (nTotalBase * OLD."PorcentajeRE" / 100);

  nTotalIVA  := Round(nTotalIVA::numeric, 2);
  nTotalRE   := Round(nTotalRE::numeric, 2);
  nTotalDtos := Round(nTotalDtos::numeric, 2);

  PERFORM "SumaArticulo"(OLD."Referencia", OLD."TotalUnidades");

  SELECT "Cliente" INTO cCliente FROM "Albaran"
  WHERE ("Serie" = OLD."Serie") AND ("NumeroDoc" = OLD."NumeroDoc");

  PERFORM "RestaCliente"(cCliente, nTotalBase + nTotalIVA + nTotalRE);

  RETURN OLD;
end
$$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;


CREATE TABLE public."Albaran" (
  "NumeroDoc"        public."NumeroDocumento" NOT NULL,
  "Serie"            public."Serie" NOT NULL,
  "Fecha"            date NOT NULL,
  "Cliente"          public."CodigoCliProv" NOT NULL,
  "Nombre"           public."RazonSocial",
  "BaseImponible"    public."Importes",
  "IVA"              public."Importes",
  "RE"               public."Importes",
  "Notas"            public."Memo",
  "CodigoDir"        public."CodigoDireccion",
  "Direccion"        public."Direccion",
  "Poblacion"        public."Poblacion",
  "CodigoPostal"     public."CodigoPostal",
  "Provincia"        public."Provincia",
  "Pais"             public."Pais",
  "CIF"              public."CIF",
  "Total"            public."Importes",
  "Agente"           public."CodigoAgente",
  "SuNumeroPedido"   public."SuNumeroPedido",
  "Telefono"         public."Telefono",
  "Fax"              public."Telefono",
  "FormaPago"        public."FormaPago",
  "Transportista"    public."CodigoTransporte",
  "Repartidor"       public."CodigoRepartidor",
  "Portes"           public."Importes",
  "DebidosPagados"   public."Boolean",
  "Gastos"           public."Importes",
  "TotalDescuentos"  public."Importes",
  "TotalPesoNeto"    public."Peso",
  "TotalPesoBruto"   public."Peso",
  "Facturado"        public."Boolean",
  "Modificado"       public."Boolean"
  /* Llaves */
  CONSTRAINT "PK_Albaran"
    PRIMARY KEY ("Serie", "NumeroDoc")
) WITH (
    OIDS = FALSE
  );

CREATE INDEX "IDX_Albaran_Nombre"
  ON public."Albaran"
  ("Nombre");

CREATE TRIGGER "Albaran_BD"
  BEFORE DELETE
  ON public."Albaran"
  FOR EACH ROW
  EXECUTE PROCEDURE public."AlbaranBeforeDelete"();

CREATE TRIGGER "Albaran_BU"
  BEFORE UPDATE
  ON public."Albaran"
  FOR EACH ROW
  EXECUTE PROCEDURE public."AlbaranBeforeUpdate"();

CREATE TABLE public."AlbaMov" (
  "RecNo"              serial NOT NULL,
  "Serie"              public."Serie" NOT NULL,
  "NumeroDoc"          public."NumeroDocumento" NOT NULL,
  "Referencia"         public."CodigoArticulo" NOT NULL,
  "Descripcion"        public."Descripcion",
  "Cantidad"           public."Cantidad",
  "Precio"             public."Importes",
  "PrecioCosto"        public."Importes",
  "PorcentajeIVA"      public."Porcentaje",
  "PorcentajeRE"       public."Porcentaje",
  "Almacen"            public."CodigoAlmacen",
  "Lote"               public."Lote",
  "Unidades"           public."Cantidad",
  "TotalUnidades"      public."Cantidad",
  "CodigoPromocion"    public."CodigoArticuloOpcional",
  "Promocion"          public."Cantidad",
  "DescuentoBase"      public."Porcentaje",
  "DescuentoResto"     public."Porcentaje",
  "PesoNeto"           public."Peso",
  "PesoBruto"          public."Peso",
  "ReferenciaCliente"  public."CodigoArticuloOpcional",
  "Modificado"         public."Boolean",
  "FechaCaducidad"     date,
  "TotalLinea"         public."Importes",
  "SeriePedido"        public."Serie",
  "NumeroPedido"       public."NumeroDocumento",
  /* Llaves */
  CONSTRAINT "PK_AlbaMov"
    PRIMARY KEY ("RecNo")
) WITH (
    OIDS = FALSE
  );

CREATE INDEX "IDX_AlbaMov_SerieNumeroDoc"
  ON public."AlbaMov"
  ("Serie", "NumeroDoc", "RecNo");

CREATE TRIGGER "AlbaMov_AD"
  AFTER DELETE
  ON public."AlbaMov"
  FOR EACH ROW
  EXECUTE PROCEDURE public."AlbaMovAfterDelete"();

做测试，我发现如果我从这个函数中删除主表记录，它是完美的，为什么没有坏？，我无法理解。

CREATE OR REPLACE FUNCTION public."Albaran2Factura"
(
  IN  "cSerieAlbaran"   public."SerieDocumento",
  IN  "nNumeroAlbaran"  public."NumeroDocumento"
)
RETURNS SETOF public."SerieNumeroDocumento" AS
$$
declare rDocumento "SerieNumeroDocumento"%ROWTYPE;
declare rMaster RECORD;
declare rDetail RECORD;
declare rConfig RECORD;
declare rIVA RECORD;
declare cRegimenIVA CHAR;
declare nNumeroFactura "NumeroDocumento";
declare nPorcentajeIVAPortes "Importes";
declare nPorcentajeREPortes "Importes";

begin
  rDocumento."Serie"     := '';
  rDocumento."NumeroDoc" := -1;

  SELECT * INTO rConfig FROM "Empresa" LIMIT 1;

  SELECT "PorcentajeIVA", "PorcentajeRE" INTO rIVA FROM "Iva"
  WHERE "Tipo" = rConfig."TipoIVAPortes";

  nPorcentajeIVAPortes := rIVA."PorcentajeIVA";
  nPorcentajeREPortes  := rIVA."PorcentajeRE";

  UPDATE "Numera" 
  SET "NumeroDoc" = "NumeroDoc" + 1
  WHERE ("TipoDocumento" = 'FV') AND ("Serie" = "cSerieAlbaran");

  SELECT "NumeroDoc" INTO nNumeroFactura FROM "Numera"
  WHERE ("TipoDocumento" = 'FV') AND ("Serie" = "cSerieAlbaran");

  SELECT * INTO rMaster FROM "Albaran"
  WHERE ("Serie" = "cSerieAlbaran") AND ("NumeroDoc" = "nNumeroAlbaran");

  SELECT "RegimenIVA" INTO cRegimenIVA FROM "Clientes"
  WHERE "Codigo" = rMaster."Cliente";

  IF ("cSerieAlbaran" <> 'ZZZ') THEN

    IF (cRegimenIVA = 'G') THEN
      nPorcentajeREPortes := 0;
    ELSIF (cRegimenIVA = 'E') THEN
      nPorcentajeIVAPortes := 0;
      nPorcentajeREPortes  := 0;
    END IF; /* IF (cRegimenIVA = 'G') */

  ELSE
    nPorcentajeIVAPortes := 0;
    nPorcentajeREPortes  := 0;
  END IF; /* IF ("cSerieAlbaran" <> 'ZZZ') */

  INSERT INTO "Factura" ("NumeroDoc",            
                         "Serie",                
                         "Fecha",                
                         "Cliente",              
                         "Nombre",               
                         "BaseImponible",        
                         "IVA",                  
                         "RE",                   
                         "Notas",                
                         "Direccion",            
                         "Poblacion",            
                         "CodigoPostal",         
                         "Provincia",            
                         "CIF",                  
                         "Total",                
                         "Agente",
                         "CodigoDir",            
                         "Pais",                 
                         "SuNumeroPedido",       
                         "Telefono",             
                         "Fax",                  
                         "FormaPago",            
                         "Transportista",        
                         "Repartidor",           
                         "Portes",               
                         "DebidosPagados",       
                         "Gastos",               
                         "TotalDescuentos",      
                         "TotalPesoNeto",        
                         "TotalPesoBruto",
                         "PorcentajeIVAPortes",  
                         "PorcentajeREPortes",   
                         "Albaranes",            
                         "Exportada",            
                         "Rapel",                
                         "Cobrada",              
                         "Modificado") 
  VALUES (nNumeroFactura,            
          "cSerieAlbaran",                
          current_date,                
          rMaster."Cliente",              
          rMaster."Nombre",               
          rMaster."BaseImponible",        
          rMaster."IVA",                  
          rMaster."RE",                   
          rMaster."Notas",                
          rMaster."Direccion",            
          rMaster."Poblacion",            
          rMaster."CodigoPostal",         
          rMaster."Provincia",            
          rMaster."CIF",                  
          rMaster."Total",                
          rMaster."Agente",
          rMaster."CodigoDir",            
          rMaster."Pais",                 
          rMaster."SuNumeroPedido",       
          rMaster."Telefono",             
          rMaster."Fax",                  
          rMaster."FormaPago",            
          rMaster."Transportista",        
          rMaster."Repartidor",           
          rMaster."Portes",               
          rMaster."DebidosPagados",       
          rMaster."Gastos",               
          rMaster."TotalDescuentos",      
          rMaster."TotalPesoNeto",        
          rMaster."TotalPesoBruto",
          nPorcentajeIVAPortes,  
          nPorcentajeREPortes,   
          'Albaran ' || "nNumeroAlbaran" || '/' || "cSerieAlbaran",            
          '0',            
          '0',                
          '0',              
          '1');

  FOR rDetail IN SELECT * FROM "AlbaMov"
                 WHERE ("Serie" = "cSerieAlbaran") AND ("NumeroDoc" = "nNumeroAlbaran")
                 ORDER BY "RecNo"
  LOOP

      INSERT INTO "FacMov" ("Serie",            
                            "NumeroDoc",        
                            "Referencia",       
                            "Descripcion",      
                            "Cantidad",         
                            "Precio",           
                            "PorcentajeIVA",    
                            "PorcentajeRE",     
                            "NumeroAlbaran",    
                            "SerieAlbaran",     
                            "FechaAlbaran",     
                            "NumeroPedido",     
                            "SeriePedido",      
                            "PrecioCosto",      
                            "Almacen",          
                            "Lote",             
                            "Unidades",         
                            "TotalUnidades",    
                            "CodigoPromocion",  
                            "Promocion",        
                            "DescuentoBase",    
                            "DescuentoResto",   
                            "PesoNeto",         
                            "PesoBruto",        
                            "ReferenciaCliente",
                            "Modificado",       
                            "FechaCaducidad",   
                            "NoDescontar",      
                            "Agente",           
                            "Repartidor")
             VALUES ("cSerieAlbaran",            
                     nNumeroFactura,        
                     rDetail."Referencia",       
                     rDetail."Descripcion",      
                     rDetail."Cantidad",         
                     rDetail."Precio",           
                     rDetail."PorcentajeIVA",    
                     rDetail."PorcentajeRE",     
                     rMaster."NumeroDoc",    
                     rMaster."Serie",     
                     rMaster."Fecha",     
                     rDetail."NumeroPedido",     
                     rDetail."SeriePedido",      
                     rDetail."PrecioCosto",      
                     rDetail."Almacen",          
                     rDetail."Lote",             
                     rDetail."Unidades",         
                     rDetail."TotalUnidades",    
                     rDetail."CodigoPromocion",  
                     rDetail."Promocion",        
                     rDetail."DescuentoBase",    
                     rDetail."DescuentoResto",   
                     rDetail."PesoNeto",         
                     rDetail."PesoBruto",        
                     rDetail."ReferenciaCliente",
                     '1',       
                     rDetail."FechaCaducidad",   
                     '0',      
                     rMaster."Agente",           
                     rMaster."Repartidor");

  END LOOP;


  /********************** Deleting master record work ****************/

  DELETE FROM "Albaran"
  WHERE ("Serie" = "cSerieAlbaran") AND ("NumeroDoc" = "nNumeroAlbaran");

  /**************************************/

  rDocumento."Serie"     := "cSerieAlbaran";
  rDocumento."NumeroDoc" := nNumeroFactura;

  RETURN NEXT rDocumento;


end
$$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER;

这不起作用：

CREATE OR REPLACE FUNCTION public."BorrarAlbaran"
(
  IN  "cSerie"      public."SerieDocumento",
  IN  "nNumeroDoc"  public."NumeroDocumento"
)
RETURNS void AS
$$
begin
  DELETE FROM "Albaran"
  WHERE ("Serie" = "cSerie") and ("NumeroDoc" = "nNumeroDoc");
end
$$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;

解决方法：

CREATE OR REPLACE FUNCTION public."BorrarAlbaranVenta"
(
  IN  "cSerie"      public."SerieDocumento",
  IN  "nNumeroDoc"  public."NumeroDocumento"
)
RETURNS void AS
$$
begin
  DELETE FROM "AlbaMov"
  WHERE ("Serie" = "cSerie") and ("NumeroDoc" = "nNumeroDoc");

  DELETE FROM "Albaran"
  WHERE ("Serie" = "cSerie") and ("NumeroDoc" = "nNumeroDoc");
end
$$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;
4

1 回答 1

2

当您删除 Master 表中的记录时，会从 Detail 中删除所有记录，并且我将 Master 表中的“Total”字段更新为 0，但不会删除 Master 表记录。如果我从 Master 表中删除了没有 Detail 表中的记录的记录，则可以顺利删除。

这通常表明触发器正在级联将行重新插入到具有副作用的前触发器中。

在 Postgres 中，更新实际上是删除后插入。一旦所有之前的触发器都完成了它们的工作，旧的行/ctid 将被标记为死，并创建一个新的行/ctid——从 txid_current() 开始。然后触发后触发。

这里要理解的一点是，您不是在操纵行本身。相反，您在给定时间处理行的快照，后者由其 ctid 和各种元信息引用：

http://www.postgresql.org/docs/9.2/static/ddl-system-columns.html

无论如何，我只是粗略地看了一下，但我的猜测是 AlbaranBeforeDelete() 是罪魁祸首。

在 row/ctid1 被删除之前，您级联删除子表中的行。当你这样做时，row/ctid1 仍然被标记为活动，而不是已经被标记为死......也有充分的理由：如果你在删除前触发器中返回 null，则该行不会被删除。

此时，您的子表的 after delete 触发器将启动并更新 row/ctid1。此语句在创建新的、活动的和更新的 row/ctid2 时将 row/ctid1 标记为已死。

然后您的初始语句继续。Postgres 将 row/ctid1 标记为已死（顺便说一句，它已经死了），并且在触发器触发之后。但是，您仍然留下了一个实时行/ctid2，因为您的原始语句在触发每个后者的触发器之前计算出受影响的行/ctid，并不知道。因此 row/ctid2 会继续存在。

解决方法是改变你的流程，使之前的触发器没有任何副作用。副作用属于触发后。

诚然，有人可能会说这是 Postgres 中的一个错误。几年前它咬了我一口，当我这样做时，它被当作一个功能而被忽视了。

顺便说一句，如果上述内容不是 100% 清楚，这里是正在发生的另一个典型示例：

create table if not exists test (
    id serial primary key
);

create table if not exists subtest (
    id serial primary key,
    test_id int references test(id) on delete cascade
);

create function break_pgsql() returns trigger as $$
begin
    return null;
end;
$$ language plpgsql;

create trigger break_pgsql before delete on subtest
    for each row
execute procedure break_pgsql();

insert into test default values;
insert into subtest (test_id) select id from test;
delete from test;
select * from test;    -- empty
select * from subtest; -- not empty

在上面的代码中，Postgres 的内置触发器级联删除了相关的行。生成的 delete 语句被发出，但是带有副作用的 before 触发器会弄乱它，从而产生带有无效外键的行。

于 2013-05-03T09:34:06.947 回答