oracle – 是否有可能获得变量的最大可能长度

我想知道在plsql中是否存在给出变量最大长度的函数.

例如,如果我声明

DECLARE

varia VARCHAR2(7)
BEGIN
   call of a function that would return 7
END

即使varia为null,我也可以得到varchar的长度为7.

—例如

create or replace 
TYPE ENREG_320_03 UNDER ENREG_320_BASE(
date_creation VARCHAR2(8),raison_sociale_emetteur VARCHAR2(35),adresse_emetteur_1 VARCHAR2(35),adresse_emetteur_2 VARCHAR2(35),adresse_emetteur_3 VARCHAR2(35),num_siret VARCHAR2(14),ref_remise VARCHAR2(16),code_bic_emetteur VARCHAR2(11),type_ident_compte_debit VARCHAR2(1),ident_compte_debit VARCHAR2(34),code_devise_compte_debit VARCHAR2(3),ident_client VARCHAR2(16),type_ident_compte_frais VARCHAR2(1),ident_compte_frais VARCHAR2(34),code_devise_compte_frais VARCHAR2(3),zone_reserve VARCHAR2(16),indice_type_debit_remise VARCHAR2(1),indice_type_remise  VARCHAR2(1),date_execution_souhait VARCHAR2(8),devise_transfert VARCHAR2(3),MEMBER FUNCTION get_date_creation RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.date_creation IS NULL THEN lpad(' ',8,' ') ELSE   rpad(SELF.date_creation,' ') END;
END get_date_creation;

MEMBER FUNCTION get_raison_sociale_emetteur RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.raison_sociale_emetteur IS NULL THEN lpad(' ',35,' ') ELSE rpad(SELF.raison_sociale_emetteur,' ') END;
END get_raison_sociale_emetteur;

MEMBER FUNCTION get_adresse_emetteur_1 RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.adresse_emetteur_1 IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.adresse_emetteur_1,' ') END;
END get_adresse_emetteur_1;

MEMBER FUNCTION get_adresse_emetteur_2 RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.adresse_emetteur_2 IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.adresse_emetteur_2,' ') END;
END get_adresse_emetteur_2;

MEMBER FUNCTION get_adresse_emetteur_3 RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.adresse_emetteur_3 IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.adresse_emetteur_3,' ') END;
END get_adresse_emetteur_3;

MEMBER FUNCTION get_num_siret RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.num_siret IS NULL THEN lpad(' ',14,' ') ELSE rpad(SELF.num_siret,' ') END;
END get_num_siret;

MEMBER FUNCTION get_ref_remise RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ref_remise IS NULL THEN lpad(' ',16,' ') ELSE rpad(SELF.ref_remise,' ') END;
END get_ref_remise;

MEMBER FUNCTION get_code_bic_emetteur RETURN VARCHAR2 AS
BEGIN
   RETURN CASE WHEN SELF.code_bic_emetteur IS NULL THEN lpad(' ',11,' ') ELSE rpad(SELF.code_bic_emetteur,' ') END;
END get_code_bic_emetteur;

MEMBER FUNCTION get_type_ident_compte_debit RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.type_ident_compte_debit IS NULL THEN lpad(' ',1,' ') ELSE rpad(SELF.type_ident_compte_debit,' ') END;
END get_type_ident_compte_debit;

MEMBER FUNCTION get_ident_compte_debit RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ident_compte_debit IS NULL THEN lpad(' ',34,' ') ELSE rpad(SELF.ident_compte_debit,' ') END;
END get_ident_compte_debit;

MEMBER FUNCTION get_code_devise_compte_debit RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.code_devise_compte_debit IS NULL THEN lpad(' ',3,' ') ELSE rpad(SELF.code_devise_compte_debit,' ') END;
END get_code_devise_compte_debit;

MEMBER FUNCTION get_ident_client RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ident_client IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.ident_client,' ') END;
END get_ident_client;

MEMBER FUNCTION get_type_ident_compte_frais RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.type_ident_compte_frais IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.type_ident_compte_frais,' ') END;
END get_type_ident_compte_frais;

MEMBER FUNCTION get_ident_compte_frais RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ident_compte_frais IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.ident_compte_frais,' ') END;
END get_ident_compte_frais;

MEMBER FUNCTION get_code_devise_compte_frais RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.code_devise_compte_frais IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.code_devise_compte_frais,' ') END;
END get_code_devise_compte_frais;

MEMBER FUNCTION get_zone_reserve RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.zone_reserve IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.zone_reserve,' ') END;
END get_zone_reserve;

MEMBER FUNCTION get_indice_type_debit_remise RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.indice_type_debit_remise IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.indice_type_debit_remise,' ') END;
END get_indice_type_debit_remise;

MEMBER FUNCTION get_indice_type_remise RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.indice_type_remise IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.indice_type_remise,' ') END;
END get_indice_type_remise;

MEMBER FUNCTION get_date_execution_souhait RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.date_execution_souhait IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.date_execution_souhait,' ') END;
END get_date_execution_souhait;

MEMBER FUNCTION get_devise_transfert RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.devise_transfert IS NULL THEN lpad(' ',' ') ELSE rpad(SELF.devise_transfert,' ') END;
END get_devise_transfert;

所以我想知道是否存在一个简单的函数来获得字段的大小所以我不必在getter中使用数字：如果字段的大小改变了,就没有必要更改getter,它会工作无论varchar的大小

但我明白这是不可能的

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