Изменения представления — различия между версиями

Версия 11:10, 14 июля 2016

Изменение VIEW

• изменяет view,таблицы
  

пока что без добавления join'ов во view - там всё не так однозначно

Пример:

 
/* создание генератора */
execute procedure PR_ALTER_VIEW('','','gen1111','generator');
/* создание или добавление в конец триггера */
execute procedure pr_alter_view('SELECTMODES','SELECTMODES_BI','--test','TRIGGER','BEFORE INSERT')
/* создание индекса */
execute procedure PR_ALTER_VIEW('wares','name_id','wares_idx100500','index');
execute procedure PR_ALTER_VIEW('wares','name_id','wares_idx100501','DESCENDING INDEX');
execute procedure PR_ALTER_VIEW('wares','name_id','wares_idx100502','ASCENDING INDEX');
/* первичный ключ */
execute procedure PR_ALTER_VIEW('TEMP_MNN','ID','','PRIMARY KEY');
/* изменение таблицы */
execute procedure PR_ALTER_VIEW('DOC_DETAIL','MGN_ID1','DM_DATETIME','TABLE');
/* изменение вьюхи */
execute procedure PR_ALTER_VIEW('VW_WARES','MGN_ID','w.mgn_id','VIEW');
execute procedure PR_ALTER_VIEW('VW_WARES','MGN_ID','w.mgn_id');
execute procedure PR_ALTER_VIEW('VW_WARES','MGN_ID','w.mgn_id','');
/* создание домена */
execute procedure PR_ALTER_VIEW('DM_BIGINT1','','BIGINT','DOMAIN');

Установка:

SET TERM ^ ;

create or alter procedure PR_ALTER_VIEW (
    VW_NAME DM_TEXT,
    NEW_VW_FIELD DM_TEXT,
    NEW_VW_VALUE DM_TEXT,
    NEW_VW_JOIN DM_TEXT = null,
    NEW_EVENT DM_TEXT = null)
as
declare variable I DM_ID;
declare variable VW_BODY DM_TEXT_BIG;
declare variable VW_FIELDS DM_TEXT_BIG;
declare variable J DM_ID;
declare variable STR DM_TEXT_BIG;
declare variable L integer;
begin
  if ((:NEW_VW_JOIN is null) or (:NEW_VW_JOIN = '') or (upper(:NEW_VW_JOIN) = 'VIEW'))  then
  begin
    select list(trim(RDB$FIELD_NAME))
    from (select RC.RDB$FIELD_NAME
            from RDB$RELATION_FIELDS RC
            where RC.RDB$RELATION_NAME = upper(:VW_NAME)
            order by RC.RDB$FIELD_POSITION)
    into :VW_FIELDS;
    select R.RDB$VIEW_SOURCE
    from RDB$RELATIONS R
    where R.RDB$RELATION_NAME = upper(:VW_NAME)
    into :VW_BODY;

    I = 0;
    J = 0;
    if ((select count(*)
            from RDB$RELATION_FIELDS RF
            where RF.RDB$RELATION_NAME = upper(:VW_NAME) and
             RF.RDB$FIELD_NAME = upper(:NEW_VW_FIELD)) = 0) then
    begin
        while (position('FROM', UPPER(:VW_BODY), :J + 1) <> 0) do
        begin
            J = position('FROM', UPPER(:VW_BODY), :J + 1);
            I = :I + 1;
        end

        if (:I = 1) then /* один основной from, т.е. скрипт без подзапросов */
        begin
            execute statement 'CREATE OR ALTER VIEW ' || upper(:VW_NAME) || '( ' || :VW_FIELDS || ',' || upper(:NEW_VW_FIELD) || ' ) as ' || substring(:VW_BODY from 1 for :J - 1) || ' ,' || upper(:NEW_VW_VALUE) || ' ' || substring(:VW_BODY from :J for char_length(:VW_BODY)) || '';
        end
        else
        begin /* есть подзапросы - нужно распарсить и найти основной from */
            J = 0;
            while (position('FROM', UPPER(:VW_BODY), :J + 1) <> 0) do /* находим сколько всего from'ов в скрипте */
            begin
                I = 0;
                J = position('FROM', UPPER(:VW_BODY), :J + 1);
                L = 0;
                STR = substring(:VW_BODY from L + 1 for :J - 1);
                while (position('(', STR, :L + 1) <> 0) do /* считаем количество открывающих скобок */
                begin
                    L = position('(', STR, :L + 1);
                    I = :I + 1;
                end

                L = 0;
                while (position(')', STR, :L + 1) <> 0) do /* считаем количество закрывающих скобок */
                begin
                    L = position(')', STR, :L + 1);
                    I = :I - 1;
                end

                if (:I = 0) then /* если открывающих и закрывающих поровну - значит этот from основной, если конечно в комментах нет лишних скобок */
                    execute statement 'CREATE OR ALTER VIEW ' || upper(:VW_NAME) || '( ' || :VW_FIELDS || ',' || upper(:NEW_VW_FIELD) || ' ) as ' || substring(:VW_BODY from 1 for :J - 1) || ' ,' || upper(:NEW_VW_VALUE) || ' ' || substring(:VW_BODY from :J for char_length(:VW_BODY)) || '';
            end
        end
    end
  end
  if (upper(:NEW_VW_JOIN) = 'TABLE') then
  begin
    if (not exists(select 1 from RDB$RELATION_FIELDS rf where rf.RDB$RELATION_NAME = :VW_NAME and rf.RDB$FIELD_NAME = :NEW_VW_FIELD)) then
        execute statement 'ALTER '||:NEW_VW_JOIN||' '||:VW_NAME||' ADD '||:NEW_VW_FIELD||' '||:NEW_VW_VALUE||';';
  end
  if ((upper(:NEW_VW_JOIN) = 'INDEX') or (upper(:NEW_VW_JOIN) = 'DESCENDING INDEX') or (upper(:NEW_VW_JOIN) = 'ASCENDING INDEX'))  then
  begin
    if (not exists(SELECT RDB$INDEX_NAME FROM RDB$INDICES WHERE RDB$INDEX_NAME=:NEW_VW_VALUE)) then
        execute statement 'CREATE '||:NEW_VW_JOIN||' '||:NEW_VW_VALUE||' ON '||:VW_NAME||' ('||:NEW_VW_FIELD||');';
  end
  if (upper(:NEW_VW_JOIN) = 'GENERATOR') then
  begin
    if (not exists(SELECT RDB$GENERATOR_NAME FROM RDB$GENERATORS WHERE RDB$SYSTEM_FLAG=0 and RDB$GENERATOR_NAME = :NEW_VW_VALUE)) then
        execute statement 'CREATE GENERATOR '||:NEW_VW_VALUE||';';
  end
  if (upper(:NEW_VW_JOIN) = 'PRIMARY KEY') then
  begin
    if (not exists(SELECT s.rdb$field_name FROM rdb$index_segments AS s LEFT JOIN rdb$relation_constraints AS rc ON (rc.rdb$index_name = s.rdb$index_name) WHERE rc.rdb$constraint_name = 'PK_'||:VW_NAME AND rc.rdb$constraint_type = 'PRIMARY KEY')) then
        execute statement 'ALTER TABLE '||:VW_NAME||' ADD CONSTRAINT PK_'||:VW_NAME||' PRIMARY KEY ('||:NEW_VW_FIELD||');';
  end
  if (upper(:NEW_VW_JOIN) = 'DOMAIN') then
  begin
    if (not exists(select f.rdb$field_name, t.rdb$type_name from     rdb$fields f, rdb$types t where f.rdb$field_name=:VW_NAME and f.rdb$field_type=t.rdb$type and t.rdb$field_name='RDB$FIELD_TYPE')) then
        execute statement 'CREATE DOMAIN '||:VW_NAME||' AS '||:NEW_VW_VALUE||';';
  end

  if (upper(:NEW_VW_JOIN) = 'TRIGGER') then
  begin
    if ((select r.rdb$trigger_source from rdb$triggers r where r.rdb$trigger_name = :NEW_VW_FIELD) not containing :NEW_VW_VALUE) then
    execute statement '
        CREATE OR ALTER TRIGGER '||:NEW_VW_FIELD||' FOR '||:VW_NAME||'
        ACTIVE '||:NEW_EVENT||' POSITION 0
        '||
        (select substring(r.rdb$trigger_source from 1 for CHAR_LENGTH(r.rdb$trigger_source)-3) from rdb$triggers r where r.rdb$trigger_name = :NEW_VW_FIELD)||:NEW_VW_VALUE
        ||'
         end;';
  end
end^

SET TERM ; ^

/* Existing privileges on this procedure */

GRANT EXECUTE ON PROCEDURE PR_ALTER_VIEW TO SYSDBA;