相关疑难解决方法(0)

鉴于此类型:

-- Just for testing purposes:
CREATE TYPE testType as (name text)

我可以使用此函数动态获取字段的值:

CREATE OR REPLACE FUNCTION get_field(object anyelement, field text) RETURNS text as
$BODY$
DECLARE
    value text;
BEGIN
    EXECUTE 'SELECT $1."' || field || '"'
      USING object
       INTO value;

    return value;
END;
$BODY$
LANGUAGE plpgsql

呼叫get_field('(david)'::testType, 'name')按预期工作返回"大卫".

但是如何在复合类型中设置字段的值？我试过这些功能:

CREATE OR REPLACE FUNCTION set_field_try1(object anyelement, field text, value text)
RETURNS anyelement
as
$BODY$
DECLARE
    value text;
BEGIN
    EXECUTE '$1."' || field || '" := $2'
      USING object, value; …