Merge Into ----using table to keep properties contents

Posted 2020-08-09 julia_faneast

When there are some property contents we want to keep, usually, we can use Property table to keep them.

 

1. Create one table with two fields: one is identifier (key), the other is value (value)     key : value

       

CREATE TABLE properties_bvoip3 (identifier VARCHAR2 (4000), value VARCHAR2 (4000)) ;

　　2.Insert data to property table

 

merge into properties_bvoip3 p
using (select ‘one_key‘ identifier, ‘one_value‘ value from dual) s
on (p.identifier = s.identifier)
when matched then update set p.value = s.value
when not matched then insert (identifier,value) values (s.identifier, s.value);

　　3.Get the value of one key from property table

　　1).Create one function to get value

create or replace function get_property_bvoip3( p_key Varchar2(4000)) return varchar2 as
l_tmp varchar2(4000);
begin
    select value into l_tmp from properties_bvoip3 where p_key=identifier;
    return l_tmp;
    exception when others then
        return null;
end;
/

　　2).Get value

l_value := get_property_bvoip3(‘one_key‘);