Question

在pl / sql中，我可以使用in关键字和一组字符串：

select * from languages where language_tag in ('en','fr','es')

如何在脚本的('en','fr','es')部分中定义DECLARE的集合并再次使用它？

- 编辑：一个非常讨厌的方法（这是我目前的方法！）是在声明部分中将项目定义为csv字符串并使用execute_immediate：

DECLARE
  v_csv_tags VARCHAR2(123) :='''en'',''es''';

BEGIN
execute immediate 'delete from config_supports_language where language_code not in ('||v_csv_tags||')';
execute immediate 'delete from languages where language_code not in ('||v_csv_tags||')';

END;
/
EXIT;

Answer 1

您可以创建嵌套表或varray SQL类型（作为架构对象），然后在PL / SQL存储过程或匿名PL / SQL块中使用它，如下所示：

SQL类型

create type T_List as table of varchar2(123);
/
Type created

PL / SQ块：

declare
   l_list T_List3 := T_List3('en','fr','es'); -- the l_list also can be initialized
begin                                         -- in the BEGIN..END section
   select <<columns list>> 
     into <<variables>>
     from languages 
    where language_tag in (select column_values  -- you can query table(l_list)
                             from table(l_list)) -- as many times as you like
exception
  when no_data_found
  then dbms_output.put_line('No data is found');
end;

如何在pl / sql脚本的declare部分定义一组字符串

1 个答案: