初始化pl / sql记录类型

时间:2011-11-07 19:20:35

标签: sql oracle plsql oracle10g

在PL / SQL中,varray可以在创建时初始化为:

TYPE colour_tab IS VARRAY(3) OF VARCHAR2(20);
    french_colours colour_tab := colour_tab('RED','WHITE','BLUE');

PL / SQL记录类型是否有等效的初始化方法?

type location_record_type is record (
      street_address       varchar2(40),
     postal_code          varchar2(12),
      city                 varchar2(30),
     state_province       varchar2(25),
     country_id           char(2) not null := 'US'
    );

5 个答案:

答案 0 :(得分:7)

使用函数作为一种“构造函数”函数(查看函数f()):

DECLARE
  TYPE ty_emp IS RECORD(
    id INTEGER,
    name VARCHAR(30),
    deptcode VARCHAR(10)
    );
  TYPE ty_tbl_emp IS TABLE OF ty_emp;
  tbl_emp ty_tbl_emp;
  FUNCTION f (             -- <==============
    id INTEGER,
    name VARCHAR,
    deptcode VARCHAR) RETURN ty_emp IS
  e ty_emp;
  BEGIN
    e.id := id;
    e.name := name;
    e.deptcode := deptcode;
    RETURN e;
  END f;
BEGIN

  tbl_emp := ty_tbl_emp(
    f(1, 'Johnson', 'SALES'), 
    f(2, 'Peterson', 'ADMIN'));
  Dbms_Output.put_line(tbl_emp(2).name);
END;  

答案 1 :(得分:4)

不,没有。您必须明确指定每个值。 Documentation reference here

答案 2 :(得分:3)

记录类型实际上是为从SELECT语句中保存行而设计的。

    ....
    type location_record_type is record (
          street_address       varchar2(40),
         postal_code          varchar2(12),
          city                 varchar2(30),
         state_province       varchar2(25),
         country_id           char(2) not null := 'US'
        );
    type location_record_nt is table of location_record_type;
    loc_recs location_record_nt;
begin
    select street_name
           , pcode
           , city
           , region
           , country_code
    bulk collect into loc_recs
    from t69
    where ....

显然,对于查询不是SELECT * FROM单个表的情况(因为在那种情况下我们可以使用%ROWTYPE代替。

答案 3 :(得分:2)

记录初始化在其声明中执行 并通过从DUAL中进行选择来记录分配:

    declare
        type location_record_type is record
        (
            street_address       varchar2(40) := '1234 Fake Street',
            postal_code          varchar2(12) := '90210',
            city                 varchar2(30) := 'Springfield',
            state_province       varchar2(25) := 'KY',
            country_id           char(2) not null := 'US'
        );
        v_location location_record_type;

   begin 
      select 
        '4321 Another St.', '48288', 'Detroit', 'MI', v_location.country_id
      into v_location from dual;
    end;
    /

答案 4 :(得分:0)

Oracle 18c允许使用qualified expressions进行记录初始化:

declare
    type location_record_type is record
    (
        street_address       varchar2(40),
        postal_code          varchar2(12),
        city                 varchar2(30),
        state_province       varchar2(25),
        country_id           char(2) not null := 'US'
    );
    --Oracle 18c Qualified Expression:
    v_location location_record_type :=
        location_record_type('1234 Fake Street', '90210', 'Springfield', 'KY', 'US');
begin
    dbms_output.put_line('It worked!');
end;
/

您可以在Oracle Live SQL here中运行上面的示例代码。 (不幸的是,该网站需要登录。由于18c无法下载,因此测试新功能的方法并不多。)