[英]Porting from Oracle to Postgres
较早之前，我们的托管环境是在Oracle上运行的，但是现在，我们最近改用了postgres。 我相信移植表已经很成功了，因为它已经可以正常工作很长时间了。 我实际上一直在努力移植程序，但由于某种原因无法正常工作。 我浏览了ora2pg的文档部分，但无法破解，我相信这是最后的难题。
我从这个开始，在Oracle中看起来像这样：
create or replace
procedure c_audit(anonymous in boolean, aud_level IN varchar)
AUTHID CURRENT_USER IS
script varchar2(32000);
acc_select varchar(100);
open_cursor integer;
returnval integer;
p_id integer;
a_id integer;
p_name varchar2(100);
a_name varchar2(100);
v_count integer;
c_count integer;
doc_count integer;
curr_user varchar(100);
begin
for i in (select a.a_name a_name, a.a_id, p.name p_name, p.id p_id, ds.username username
from c_account a
inner join c_pro p on a.a_id = p.a_id
inner join c_dat_ds_xref x on p.id = x.p_id
inner join c_data ds on x.id_datasource = ds.id
inner join c_conntypes ct on x.id_conntype = ct.id_conntype
where ct.typeid = 'CAPTURE'
order by a.a_name, p.name)
LOOP
curr_user := i.username;
IF anonymous = true
THEN
acc_select := 'select ' || '''' || i.a_id || '''' || ' a_id,' || '''' || i.p_id || '''' || ' p_id';
ELSE
acc_select := 'select ' || '''' || i.a_name || '''' || ' a_name,' || '''' || i.p_name || '''' || ' p_name';
END IF;
IF upper(aud_level) = 'VERBATIM'
THEN
script:= acc_select || '
, count(distinct d.document_id) docCount
, sum(case when v.document_id is null or v.verbatim_type_value = ''NO_VERBATIM_TEXT'' then 0 else 1 end) VerbCount
, sum(case when v.document_id is null then (select to_number(prop_value) verbSize
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_pro = 0) else v.credits end) CreditCount
from ' || i.username || '.p_document d
left outer join (
select vi.document_id, t.verbatim_type_value
, case when dbms_lob.substr(vi.extracted_original,8) = ''<cbnull>''
or t.verbatim_type_value = ''NO_VERBATIM_TEXT''
then coalesce(s2.strucCredit, .25)
else ceil(vi.extracted_original_size/coalesce(s.verbSize, 2048)) end credits
from ' || i.username || '.p_verbatim vi
left outer join ' || i.username || '.pd_verbatim_type t on vi.verbatim_type_id = t.verbatim_type_id
, (
select to_number(prop_value) verbSize
from c_properties
where prop_name = ''METERING.MAXSIZE.VERBATIM''
and id_pro = 0
) s
, (
select to_number(prop_value) strucCredit
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_pro = 0
) s2
) v on d.document_id = v.document_id';
ELSE
IF upper(aud_level) = 'DOCUMENT'
THEN
script:= acc_select || '
, count(distinct a.document_id) docCount
, sum(credits) creditCount
from (
select d.document_id, ceil(sum(v.extracted_original_size)/coalesce(s.verbSize,2048)) credits
from ' || i.username || '.p_document d
inner join ' || i.username || '.p_verbatim v on d.document_id = v.document_id
inner join ' || i.username || '.pd_verbatim_type t on v.verbatim_type_id = t.verbatim_type_id
, (
select to_number(prop_value) verbSize
from c_properties
where prop_name = ''METERING.MAXSIZE.VERBATIM''
and id_pro = 0
) s
where t.verbatim_type_value <> ''NO_VERBATIM_TEXT''
and dbms_lob.substr(v.extracted_original,8) <> ''<cbnull>''
group by d.document_id, s.verbSize
union
select d.document_id, coalesce(s2.strucCredit, .25)
from ' || i.username || '.p_document d
, (
select to_number(prop_value) strucCredit
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_pro = 0
) s2
where d.document_id not in (select distinct v.document_id from ' || i.username || '.p_verbatim v)
union
select distinct d.document_id, coalesce(s2.strucCredit, .25)
from ' || i.username || '.p_document d
inner join ' || i.username || '.p_verbatim v on d.document_id = v.document_id
inner join ' || i.username || '.pd_verbatim_type t on v.verbatim_type_id = t.verbatim_type_id
, (
select to_number(prop_value) strucCredit
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_pro = 0
) s2
where (t.verbatim_type_value = ''NO_VERBATIM_TEXT''
or dbms_lob.substr(v.extracted_original,8) = ''<cbnull>'')
) a';
ELSE
dbms_output.put_line('Invalid choice for audit level, no audit generated');
exit;
END IF;
END IF;
begin
open_cursor := dbms_sql.open_cursor;
DBMS_SQL.PARSE(open_cursor, script,
DBMS_SQL.NATIVE);
IF anonymous = true then
dbms_sql.define_column(open_cursor,1,a_id);
dbms_sql.define_column(open_cursor,2,p_id);
else
dbms_sql.define_column(open_cursor,1,a_name,100);
dbms_sql.define_column(open_cursor,2,p_name,100);
end if;
dbms_sql.define_column(open_cursor,3,doc_count);
dbms_sql.define_column(open_cursor,4,v_count);
IF upper(aud_level) = 'VERBATIM' then
dbms_sql.define_column(open_cursor,5,c_count);
end if;
returnval := DBMS_SQL.EXECUTE(open_cursor);
loop
if dbms_sql.fetch_rows(open_cursor) > 0 then
IF anonymous = true then
dbms_sql.column_value(open_cursor,1,a_id);
dbms_sql.column_value(open_cursor,2,p_id);
dbms_sql.column_value(open_cursor,3,doc_count);
dbms_sql.column_value(open_cursor,4,v_count);
IF upper(aud_level) = 'VERBATIM' then
dbms_sql.column_value(open_cursor,5,c_count);
dbms_output.put_line(a_id || ',' || p_id || ',' || doc_count || ',' || v_count || ',' || c_count);
else
dbms_output.put_line(a_id || ',' || p_id || ',' || doc_count || ',' || v_count);
end if;
else
dbms_sql.column_value(open_cursor,1,a_name);
dbms_sql.column_value(open_cursor,2,p_name);
dbms_sql.column_value(open_cursor,3,doc_count);
dbms_sql.column_value(open_cursor,4,v_count);
IF upper(aud_level) = 'VERBATIM' then
dbms_sql.column_value(open_cursor,5,c_count);
dbms_output.put_line(a_name || ',' || p_name || ',' || doc_count || ',' || v_count || ',' || c_count);
else
dbms_output.put_line(a_name || ',' || p_name || ',' || doc_count || ',' || v_count);
end if;
end if;
else
exit;
end if;
end loop;
exception
when others then
--dbms_output.put_line('Error occured. Please check if the current user has Select access to table ' || curr_user || '.p_document ' || curr_user || '.p_verbatim ' || curr_user || '.pd_verbatim_type');
dbms_output.put_line('Error occured. Please login as ' || curr_user || ' and run the following:');
dbms_output.put_line('GRANT SELECT ON ' || curr_user || '.P_DOCUMENT to ' || user ||';');
dbms_output.put_line('GRANT SELECT ON ' || curr_user || '.P_VERBATIM to ' || user ||';');
dbms_output.put_line('GRANT SELECT ON ' || curr_user || '.pd_verbatim_type to ' || user ||';');
end;
end loop;
end;
就语法而言，此过程是否正确？
CREATE OR REPLACE FUNCTION c_audit(anonymous boolean, aud_level text) RETURNS VOID AS $body$
DECLARE
script text;
acc_select text;
returnval integer;
p_id integer;
a_id integer;
i record;
p_name text;
a_name text;
v_count integer;
c_count integer;
doc_count integer;
curr_user text;
BEGIN
for i in (SELECT a.a_name a_name, a.a_id, p.name p_name, p.id p_id, ds.username username
from c_account a
inner join c_pro p on a.a_id = p.a_id
inner join c_dat_ds_xref x on p.id = x.p_id
inner join c_data ds on x.id_datasource = ds.id
inner join c_conntypes ct on x.id_conntype = ct.id_conntype
where ct.typeid = 'CAPTURE'
order by a.a_name, p.name)
LOOP
curr_user := i.username;
IF anonymous = true
THEN
acc_select := 'SELECT ' || '''' || i.a_id || '''' || ' AccountID,' || '''' || i.p_id || '''' || ' ProjectID';
ELSE
acc_select := 'SELECT ' || '''' || i.a_name || '''' || ' AccountName,' || '''' || i.p_name || '''' || ' ProjectName';
END IF;
IF upper(aud_level) = 'VERBATIM'
THEN
script:= acc_select || '
, count(distinct d.document_id) docCount
, sum(case when coalesce(CAST(v.document_id AS text), '') = '' or v.verbatim_type_value = ''NO_VERBATIM_TEXT'' then 0 else 1 end) VerbCount
, sum(case when coalesce(CAST(v.document_id AS text), '') = '' then (SELECT to_number(prop_value,''9999.99'') verbSize
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_project = 0) else v.credits end) CreditCount
from ' || i.username || '.p_document d
left outer join (
SELECT vi.document_id, t.verbatim_type_value
, case when substr(vi.extracted_original,8) = ''<cbnull>''
or t.verbatim_type_value = ''NO_VERBATIM_TEXT''
then coalesce(s2.strucCredit, .25)
else ceil(vi.extracted_original_size/coalesce(s.verbSize, 2048)) end credits
from ' || i.username || '.p_verbatim vi
left outer join ' || i.username || '.pd_verbatim_type t on vi.verbatim_type_id = t.verbatim_type_id
, (
select to_number(prop_value,''9999.99'') verbSize
from c_properties
where prop_name = ''METERING.MAXSIZE.VERBATIM''
and id_project = 0
) s
, (
select to_number(prop_value,''9999.99'') strucCredit
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_project = 0
) s2
) v on d.document_id = v.document_id';
SELECT format(script) into script;
ELSE IF upper(aud_level) = 'DOCUMENT'
THEN
script:= acc_select || '
, count(distinct a.document_id) docCount
, sum(credits) creditCount
from (
SELECT d.document_id, ceil(sum(v.extracted_original_size)/coalesce(s.verbSize,2048)) credits
from ' || i.username || '.p_document d
inner join ' || i.username || '.p_verbatim v on d.document_id = v.document_id
inner join ' || i.username || '.pd_verbatim_type t on v.verbatim_type_id = t.verbatim_type_id
, (
SELECT to_number(prop_value,''9999.99'') verbSize
from c_properties
where prop_name = ''METERING.MAXSIZE.VERBATIM''
and id_project = 0
) s
where t.verbatim_type_value <> ''NO_VERBATIM_TEXT''
and substr(v.extracted_original,8) <> ''<cbnull>''
group by d.document_id, s.verbSize
union
select d.document_id, coalesce(s2.strucCredit, .25)
from ' || i.username || '.p_document d
, (
select to_number(prop_value,''9999.99'') strucCredit
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_project = 0
) s2
where d.document_id not in (select distinct v.document_id from ' || i.username || '.p_verbatim v)
union
select distinct d.document_id, coalesce(s2.strucCredit, .25)
from ' || i.username || '.p_document d
inner join ' || i.username || '.p_verbatim v on d.document_id = v.document_id
inner join ' || i.username || '.pd_verbatim_type t on v.verbatim_type_id = t.verbatim_type_id
, (
select to_number(prop_value,''9999.99'') strucCredit
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_project = 0
) s2
where (t.verbatim_type_value = ''NO_VERBATIM_TEXT''
or substr(v.extracted_original,8) = ''<cbnull>'')
) a';
SELECT format(script) into script;
ELSE
SELECT format(script) into script;
exit;
END IF;
END IF;
BEGIN
IF anonymous = true
THEN
IF upper(aud_level) = 'VERBATIM'
THEN
EXECUTE script into a_id, p_id, doc_count, v_count, c_count;
ELSE
EXECUTE script into a_id, p_id, doc_count, c_count;
END IF;
ELSE
IF upper(aud_level) = 'VERBATIM'
THEN
EXECUTE script into a_name, p_name, doc_count, v_count, c_count;
ELSE
EXECUTE script into a_name, p_name, doc_count, c_count;
END IF;
END IF;
GET DIAGNOSTICS returnval := ROW_COUNT;
LOOP
IF returnval > 0
THEN
IF anonymous = true
THEN
IF upper(aud_level) = 'VERBATIM'
THEN
SELECT format ('Information %s, %s, %s, %s, %s', a_id, p_id, doc_count, v_count, c_count);
ELSE
SELECT format ('Information %s, %s, %s, %s', a_id, p_id, doc_count, c_count);
END IF;
ELSE
IF upper(aud_level) = 'VERBATIM'
THEN
SELECT format ('Information %s, %s, %s, %s, %s', a_name, p_name, doc_count, v_count, c_count);
ELSE
SELECT format ('Information %s, %s, %s, %s', a_name, p_name, doc_count, c_count);
END IF;
END IF;
ELSE
EXIT;
END IF;
END LOOP;
EXCEPTION
WHEN others THEN
PERFORM format('Error occured. Please login as %s, %s' , curr_user , ' and run the following:');
PERFORM format('GRANT SELECT ON %s.P_DOCUMENT to %s', curr_user, user);
PERFORM format('GRANT SELECT ON %s.P_VERBATIM to %s', curr_user, user);
PERFORM format('GRANT SELECT ON %s.pd_verbatim_type to %s', curr_user, user);
END;
END LOOP;
END;
$body$
LANGUAGE PLPGSQL
;
ALTER FUNCTION cb_audit(boolean, text) OWNER TO USER;
-- REVOKE ALL ON FUNCTION cb_audit FROM PUBLIC;
我得到的失败错误是-
错误：为RAISE指定了太多参数其中：RAISE处的PL / pgSQL函数“ cb_audit”行145
我发现这是一个很好的链接，用作参考
我相信，对于移植DBMS_OUTPUT.PUT_LINE，RAISE NOTICE应该是正确的方法。 我遇到了另一个错误-格式为-to_number（prop_value，'9999.99'），按照此处提到的语法正确显示，但是由于某种原因，当我切换到to_number（prop_value，''9999.99''）时，我没有收到错误，但不确定为什么会这样，甚至无法正确运行。
Postgres的版本-
x86_64-unknown-linux-gnu上的PostgreSQL 9.1.10，由gcc（GCC）4.4.7 20120313（Red Hat 4.4.7-3）编译，64位
编辑：我实际上试图根据Patrick的建议修改此功能，但由于某种原因，它在屏幕上未显示任何内容。 我在每个脚本的末尾添加了format（），以将该脚本显示为，但它只是执行了代码并显示c_audit和null。 虽然我执行单个子SQL，但它们确实返回了预期的计数和结果。 我有什么想念的吗？
您正在使用两种类型的字符串“ building”：串联|| 运算符和%占位符。 两者都是完全合法的，但是首选使用format()函数 ，因为代码更简洁，PG可以防止在后台进行SQL注入之类的事情。
您得到的错误是您的RAISE NOTICE命令之一与您提供的参数有%差异。 请原谅我没有查找该line 145 ，但是很难找到line 145 。 通常，您应该像这样重写它们：
RAISE NOTICE format('GRANT SELECT ON %I.pd_verbatim_type to %I', curr_user, user);
%I占位符将SQL标识符作为输入：它不能为NULL ，并且将正确加引号，以避免SQL注入和关键字冲突。 （从您的代码中，我认为curr_user是架构名称， user是角色名称，都是SQL标识符。）
还要注意，PL / pgSQL函数中的PERFORM语句是不返回数据的SELECT语句，但是执行该语句是为了检查副作用，例如断言某些数据的存在。 因此，没有PERFORM权限，请改用GRANT SELECT 。
在PostgreSQL中引用时，SQL标识符使用双引号，而字符串文字值使用单引号。 to_number()函数肯定需要单引号。
还有几点可以改善您的代码：
（1）像这样的动态查询中的两个子选择...
'select to_number(prop_value,''9999.99'') strucCredit
from c_properties
where prop_name = ''METERING.STRUCT.ONLY.CHARGE''
and id_project = 0'
...是STABLE ：您总是得到相同的结果。 不要将它们留在动态SQL中，而是创建两个变量并将结果放在它们中，然后再执行其他操作：
DECLARE
...
verbSize numeric;
strucCredit numeric;
BEGIN
SELECT to_number(prop_value,'9999.99') INTO verbSize
FROM c_properties
WHERE prop_name = 'METERING.MAXSIZE.VERBATIM' AND id_pro = 0;
SELECT to_number(prop_value,'9999.99') INTO strucCredit
FROM c_properties
WHERE prop_name = 'METERING.STRUCT.ONLY.CHARGE' AND id_pro = 0;
...
然后在动态SQL中使用verbSize和strucCredit 。 这样，您只需一次查询这些查询，而不是每次迭代都进行几次查询。
（2）所有动态查询都需要GROUP BY 1, 2子句。
（3）子句CASE WHEN coalesce(CAST(v.document_id AS text), '') = '' ...写法应类似于CASE WHEN v.document_id IS NULL ... ，假定v.document_id不能为一个空字符串。
（4）您将RAISE NOTICE语句更改为SELECT format(...) 。 后一种形式不产生任何输出，请改用RAISE NOTICE format(...) 。
（5）也重写您的动态SQL以使用format()函数。
将应用程序从Oracle 9移植到Oracle 11 - gottchas？
[英]Porting an application from Oracle 9 to Oracle 11 - gottchas?
将Oracle过程（带有特定的函数调用）移植到Postgres PL / PGSQL
[英]Porting Oracle Procedure (With Specific Function Calls) To Postgres PL/PGSQL
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.