I need a store procedure that loop in a table that returns a name of a table in the db2 and depending from that name i need to do a select statement from the named table. i have tried doing it with an 'execute immediate' in so many ways that a lost the count here is an example of the execute immediate:
set insertstring = 'INSERT INTO pribpm.TEMP_T_TOQUE_CICLO (idSemana,tiempo_ciclo,tiempo_toque)
SELECT to_number(to_char( '''|| ' time_stamp ' ||''' ,' || ' IW ' || ')) ,SUM(KPITOTALTIMECLOCK),SUM(s.KPIEXECUTIONTIMECLOCK) FROM ' || TABLA || ' where to_number(to_char( '''|| ' time_stamp ' ||''' ,' || ' IW ' || ')) between ' || (to_number(to_char(FECHA,'IW'))-3) || ' and ' || to_number(to_char(FECHA,'IW')) || ' GROUP BY to_number(to_char('''|| ' time_stamp ' ||''' ,' || ' IW ' || '))';
PREPARE stmt FROM insertstring;
EXECUTE IMMEDIATE insertstring;
where tabla is a string that contains the name of the table and fecha is a date in timestamp type
besides i've tried it with cursors like this
set select_ = 'SELECT time_stamp, KPITOTALTIMECLOCK, KPIEXECUTIONTIMECLOCK FROM ' || tabla;
PREPARE stmt FROM select_;
FOR v2 AS
c2 cursor for
execute select_
do
if to_number(to_char(time_stamp,'IW')) between
(to_number(to_char(fecha,'IW'))-3) and to_number(to_char(fecha,'IW')) then
--something here
end if;
END FOR;
but with no success.
may you or may someone please help me clear my error or giving some other idea about this im trying to do?
all this in db2 environment
Write a procedure and loop tables from SYSCAT.TABLES to get the table name and again loop to fire a select query for each and every table.
I am not 100% sure as it has been a long time I worked on db2
Related
I have this code and I want to concatenate the variables but don't work.
This is my DDL code for the view:
CREATE OR REPLACE function acd.add_credito2()
RETURNS void
SET SCHEMA 'acd'
SET search_path = acd
AS $$
DECLARE
auxsigla text;
auxnome text;
_sql text := 'CREATE OR REPLACE VIEW acd.teste AS SELECT md.matriz_disciplina_id AS id, dcp.nome, mc.curso, mc.versao AS matriz';
_join text := ' FROM matriz_disciplina as md LEFT JOIN disciplina as dcp ON md.disciplina_id = dcp.disciplina_id LEFT JOIN matriz_curricular as mc ON md.matriz_curricular_id = mc.matriz_curricular_id';
BEGIN
select into auxsigla, auxnome from ( select sigla, nome from acd.categoria_credito where categoria_credito_id = 9) as foo;
_join := _join || ' LEFT JOIN (SELECT creditos, matriz_disciplina_id FROM acd.disciplina_credito WHERE categoria_credito_id = ' || x || ') AS ' || "auxsigla" ' ON ' || "auxsigla" || '.matriz_disciplina_id = md.matriz_disciplina_id';
_sql := _sql || ', ' || "auxsigla" || '.' || auxnome || ' AS ' || auxnome;
_sql := _sql || _join;
EXECUTE _sql;
END;
$$ LANGUAGE plpgsql
So, when I execute the function
database-1=# select acd.add_credito2();
This error appears:
ERROR: type "auxsigla" does not exist
LINE 1: ...WHERE categoria_credito_id = ' || x || ') AS ' || "auxsigla"...
^
QUERY: SELECT _join || ' LEFT JOIN (SELECT creditos, matriz_disciplina_id FROM acd.disciplina_credito WHERE categoria_credito_id = ' || x || ') AS ' || "auxsigla" ' ON ' || "auxsigla" || '.matriz_disciplina_id = md.matriz_disciplina_id'
CONTEXT: PL/pgSQL function add_credito2() line 13 at assignment
Can anyone help me? I don't know what to do now.
(I know, this study view don't have a purpose but this is the idea that I want to use in the real view)
The error comes from this construct:
"auxsigla" ' ON '
You forgot a concatenation operator || between these two tokens, and now the SQL parser interprets it as
data_type string_constant
which is a way to specify constants of a certain data type.
Working examples would be DATE '2018-09-20' or INTEGER '-20'.
Your function has numerous other problems, two of which I could spot:
select into auxsigla, auxnome from will always set the variables to NULL because you forgot to specify which columns you want to select.
you do not properly escape single quotes while composing your dynamic query string. What if auxsigla has the value with'quote?
Use format() or quote_literal() and quote_ident() for that.
I need to generate Insert script in postgres for all the tables in a database such that it can be run again without throwing any error.
The problem is, Only few tables have primary key while the rest have Unique index on different columns.
This is why I am not able to list out the columns on which unique index has been created.
The reason behind this is that the schema is automatically created through Magnolia.
Can anyone help me write the query which produces Insert statement including 'Where not Exists (Select 1 from table where column = value)' condition based on Primary Key/Unique columns?
You can use on conflict:
insert into t ( . . . )
values ( . . . )
on conflict do nothing;
This function returns Insert script for data and works well with tables on which primary constraint is not available.
I have modified the code that I found on another thread by adding the condition to it.
CREATE OR REPLACE FUNCTION public.generate_inserts(varSchema text, varTable text) RETURNS TABLE(resultado text) AS $$
DECLARE CODE TEXT;
BEGIN
CODE :=
(
SELECT
'SELECT ''INSERT INTO '
|| table_schema || '.'
|| table_name ||' ('
|| replace(replace(array_agg(column_name::text)::text,'{',''),'}','') || ') SELECT ''||'
|| replace(replace(replace(array_agg( 'quote_nullable(' || column_name::text || ')')::text,'{',''),'}',''),',',' || '','' || ')
|| ' || '' Where Not Exists (Select 1 From ' || table_name ||' Where 1 = 1 '
|| ''''
|| replace(replace(replace(replace(array_agg(' || '' and (' || column_name::text || ' = '' || quote_nullable(' || column_name::text || '),' || ' || '' or ' || column_name::text || ' is null)''')::text,'{',''),'}',''),'"',''),',','')
|| '|| '');'''
|| ' FROM ' || table_schema || '.' || table_name || ';'
FROM information_schema.columns c
WHERE table_schema = varSchema
AND table_name = varTable
GROUP BY table_schema, table_name);
RETURN QUERY
EXECUTE CODE;
END;
$$ LANGUAGE plpgsql;
I've got a plpgsql function that needs to prepare data from 3 tables based on user input, and export the data using COPY TO. The data are road accidents, so the 3 tables are accident, casualty and vehicle, each accident links to zero or more records in the vehicle and casualty tables via an accidentid column that exists in all three tables. severity and local_authorities are input parameters (both text []).
sql_query = 'SELECT COUNT(*) FROM accident WHERE severity = ANY(' || quote_literal(severity)
|| ') AND local_auth = ANY (' || quote_literal(local_authorities) || ')';
EXECUTE sql_query INTO result_count;
IF result_count > 0 THEN
-- replace Select Count(*) With Select *
sql_query = Overlay(sql_query placing '*' from 8 for 8);
-- copy the accident data first
EXECUTE 'COPY (' || sql_query || ') TO ' || quote_literal(file_path || file_name_a) ||
' CSV';
This first bit will get the relevant accidents, so I'm now looking for the most efficient way to use the accidentid's from the first query to download the related vehicle and casualty data.
I thought I'd be able to use a WITH block like this:
-- replace * with accidentid
sql_query = Overlay(sql_query placing 'accidentid' from 8 for 1);
WITH acc_ids AS (sql_query)
EXECUTE 'COPY (SELECT * FROM vehicle WHERE accidentid IN (SELECT accidentid FROM
acc_ids)) TO ' || out_path_and_vfilename || ' CSV';
EXECUTE 'COPY (SELECT * FROM casualty WHERE accidentid IN (SELECT accidentid FROM
acc_ids)) TO ' || out_path_and_cfilename || ' CSV';
but get an error:
ERROR: syntax error at or near "$1"
LINE 1: WITH acc_ids AS ( $1 ) EXECUTE 'COPY (SELECT * FROM accident....
I have tried the above in a non-dynamic test case e.g.
WITH acc_ids AS (
SELECT accidentid FROM accident
WHERE severity = ANY ('{3,2}')
AND local_auth = ANY ('{E09000001,E09000002}')
)
SELECT * FROM vehicle
WHERE accidentid IN (
SELECT accidentid FROM acc_ids);
which works. Unfortunately the server is still running Postgres 8.4 so I can't use format() for the time being.
Perhaps this isn't possible with a WITH block, but I hope it at least illustrates what I'm trying to achieve.
Edit/Update
The main goal is to get the relevant data from the 3 tables in 3 separate csv files, ideally without having to run the selection on the accident table 3 times
If you want to run a query (part) that is stored in a string variable, you need a dynamic query like
EXECUTE 'WITH acc_ids AS (' || sql_query || ')'
'SELECT ... ';
Either the whole query is a string executed by EXECUTE, or the whole query is static SQL. You cannot mix them.
Do you need a CTE? If you can express the query as a join, the optimizer has more options.
This does what I need to do without CTE but I can't see this being the most efficient way of solving this since I have to perform the same query on the accident table 3 times:
sql_query = sql_query || which_tab || ' WHERE severity = ANY ('||
quote_literal(severity) ||') AND ' || date_start || ' AND ' ||
date_end || ' AND local_auth = ANY (' ||
quote_literal(local_authorities) || ')';
-- replace * with COUNT(*)
sql_query = Overlay(sql_query placing 'COUNT(*)' from 8 for 1);
EXECUTE sql_query INTO result_count;
IF result_count > 0 THEN
-- replace COUNT(*) with *
sql_query = Overlay(sql_query placing '*' from 8 for 8);
-- copy the accident data first
EXECUTE 'COPY (' || sql_query || ') TO ' || quote_literal(file_path ||
file_name_a) || ' CSV';
sql_query = Overlay(sql_query placing 'accidentid' from 8 for 1);
-- vehicles
EXECUTE 'COPY (SELECT * FROM vehicle WHERE accidentid IN (
SELECT accidentid FROM accident
WHERE severity = ANY (' || quote_literal(severity) || ')
AND local_auth = ANY (' || quote_literal(local_authorities) ||')))
TO ' || quote_literal(file_path || file_name_v) || ' CSV';
-- casualties
EXECUTE 'COPY (SELECT * FROM casualty WHERE accidentid IN (
SELECT accidentid FROM accident
WHERE severity = ANY (' || quote_literal(severity) || ')
AND local_auth = ANY (' || quote_literal(local_authorities) ||')))
TO ' || quote_literal(file_path || file_name_c) || ' CSV';
END IF;
When I run the following command from a function I defined, I get the error "EXECUTE of SELECT ... INTO is not implemented". Does this mean the specific command is not allowed (i.e. "SELECT ...INTO")? Or does it just mean I'm doing something wrong? The actual code causing the error is below. I apologize if the answer is already out here, however I looked and could not find this specific error. Thanks in advance... For whatever it's worth I'm running 8.4.7
vCommand = 'select ' || stmt.column_name || ' as id ' ||
', count(*) as nCount
INTO tmpResults
from ' || stmt.table_name || '
WHERE ' || stmt.column_name || ' IN (select distinct primary_id from anyTable
WHERE primary_id = ' || stmt.column_name || ')
group by ' || stmt.column_name || ';';
EXECUTE vCommand;
INTO is ambiguous in this use case and then is prohibited there.
You can use a CREATE TABLE AS SELECT instead.
CREATE OR REPLACE FUNCTION public.f1(tablename character varying)
RETURNS integer
LANGUAGE plpgsql
AS $function$
begin
execute 'create temp table xx on commit drop as select * from '
|| quote_ident(tablename);
return (select count(*) from xx);
end;
$function$
postgres=# select f1('omega');
f1
────
2
(1 row)
I have an ORACLE schema containing hundreds of tables. I would like to delete the data from all the tables (but don't want to DROP the tables).
Is there an easy way to do this or do I have to write an SQL script that retrieves all the table names and runs the TRUNCATE command on each ?
I would like to delete the data using commands in an SQL-Plus session.
If you have any referential integrity constraints (foreign keys) then truncate won't work; you cannot truncate the parent table if any child tables exist, even if the children are empty.
The following PL/SQL should (it's untested, but I've run similar code in the past) iterate over the tables, disabling all the foreign keys, truncating them, then re-enabling all the foreign keys. If a table in another schema has an RI constraint against your table, this script will fail.
set serveroutput on size unlimited
declare
l_sql varchar2(2000);
l_debug number := 1; -- will output results if non-zero
-- will execute sql if 0
l_drop_user varchar2(30) := '' -- set the user whose tables you're dropping
begin
for i in (select table_name, constraint_name from dba_constraints
where owner = l_drop_user
and constraint_type = 'R'
and status = 'ENABLED')
loop
l_sql := 'alter table ' || l_drop_user || '.' || i.table_name ||
' disable constraint ' || i.constraint_name;
if l_debug = 0 then
execute immediate l_sql;
else
dbms_output.put_line(l_sql);
end if;
end loop;
for i in (select table_name from dba_tables
where owner = l_drop_user
minus
select view_name from dba_views
where owner = l_drop_user)
loop
l_sql := 'truncate table ' || l_drop_user || '.' || i.table_name ;
if l_debug = 0 then
execute immediate l_sql;
else
dbms_output.put_line(l_sql);
end if;
end loop;
for i in (select table_name, constraint_name from dba_constraints
where owner = l_drop_user
and constraint_type = 'R'
and status = 'DISABLED')
loop
l_sql := 'alter table ' || l_drop_user || '.' || i.table_name ||
' enable constraint ' || i.constraint_name;
if l_debug = 0 then
execute immediate l_sql;
else
dbms_output.put_line(l_sql);
end if;
end loop;
end;
/
Probably the easiest way is to export the schema without data, then drop an re-import it.
I was looking at this too.
Seems like you do need to go through all the table names.
Have you seen this? Seems to do the trick.
I had to do this recently and wrote a stored procedure which you can run via: exec sp_truncate;. Most of the code is based off this: answer on disabling constraints
CREATE OR REPLACE PROCEDURE sp_truncate AS
BEGIN
-- Disable all constraints
FOR c IN
(SELECT c.owner, c.table_name, c.constraint_name
FROM user_constraints c, user_tables t
WHERE c.table_name = t.table_name
AND c.status = 'ENABLED'
ORDER BY c.constraint_type DESC)
LOOP
DBMS_UTILITY.EXEC_DDL_STATEMENT('ALTER TABLE ' || c.owner || '.' || c.table_name || ' disable constraint ' || c.constraint_name);
DBMS_OUTPUT.PUT_LINE('Disabled constraints for table ' || c.table_name);
END LOOP;
-- Truncate data in all tables
FOR i IN (SELECT table_name FROM user_tables)
LOOP
EXECUTE IMMEDIATE 'TRUNCATE TABLE ' || i.table_name;
DBMS_OUTPUT.PUT_LINE('Truncated table ' || i.table_name);
END LOOP;
-- Enable all constraints
FOR c IN
(SELECT c.owner, c.table_name, c.constraint_name
FROM user_constraints c, user_tables t
WHERE c.table_name = t.table_name
AND c.status = 'DISABLED'
ORDER BY c.constraint_type)
LOOP
DBMS_UTILITY.EXEC_DDL_STATEMENT('ALTER TABLE ' || c.owner || '.' || c.table_name || ' enable constraint ' || c.constraint_name);
DBMS_OUTPUT.PUT_LINE('Enabled constraints for table ' || c.table_name);
END LOOP;
COMMIT;
END sp_truncate;
/
Putting the details from the OTN Discussion Forums: truncating multiple tables with single query thread into one SQL script gives the following which can be run in an SQL-Plus session:
SET SERVEROUTPUT ON
BEGIN
-- Disable constraints
DBMS_OUTPUT.PUT_LINE ('Disabling constraints');
FOR reg IN (SELECT uc.table_name, uc.constraint_name FROM user_constraints uc) LOOP
EXECUTE IMMEDIATE 'ALTER TABLE ' || reg.table_name || ' ' || 'DISABLE' ||
' CONSTRAINT ' || reg.constraint_name || ' CASCADE';
END LOOP;
-- Truncate tables
DBMS_OUTPUT.PUT_LINE ('Truncating tables');
FOR reg IN (SELECT table_name FROM user_tables) LOOP
EXECUTE IMMEDIATE 'TRUNCATE TABLE ' || reg.table_name;
END LOOP;
-- Enable constraints
DBMS_OUTPUT.PUT_LINE ('Enabling constraints');
FOR reg IN (SELECT uc.table_name, uc.constraint_name FROM user_constraints uc) LOOP
EXECUTE IMMEDIATE 'ALTER TABLE ' || reg.table_name || ' ' || 'ENABLE' ||
' CONSTRAINT ' || reg.constraint_name;
END LOOP;
END;
/