Creating a clear log procedure, which deletes and insert into a backup table everyday, what I need to do is after the backup table reaches a certain number of rows, I want my job(procedure) to create a new table with the same fields.
So I have a table config with the tables I need to backup identified , and I have a column named pre_bck
which has the name I want my back up table to have.
So I want to try to make a procedure that will create a table from that 'column'+the sequence number
create table 'column_name'+sequence_id as select * from xyz where 1=0;
so for example if table name was abc and sequece id was 3, table name would be abc3
I dont know if I was clear, as to what I pretend to implement, any help would be appreciated.
I second Alex and Boneist's opinion that this is probably not a good approach.
However, to answer your question:
The operator to glue together various bits of a string is ||
, not +
as in other languages: column_name || sequence_id
column_name || sequence_id
.
To execute SQL from within a procedure, you can use EXECUTE IMMEDIATE 'CREATE ...';
To select from a sequence, you need to create it with CREATE SEQUENCE my_sequence;
. To get a value: my_sequence.nextval
.
The easiest way to loop over all rows in your config table is a FOR IN ... LOOP
:
CREATE OR REPLACE PROCEDURE my_procedure IS
stmt VARCHAR2(32000);
BEGIN
FOR r IN (SELECT * FROM my_config_table ORDER BY xxx) LOOP
stmt := 'CREATE TABLE ' || pre_bck || my_sequence.nextval ||
' AS SELECT * FROM xyz WHERE 1=0';
EXECUTE IMMEDIATE stmt;
END LOOP;
END my_procedure;
/
I'm not clear what the xyz
part means, but you can surely take it from here...
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.