Re: Synchronizing a table that is in two different databases : Need to dump a table as inserts from db1 and change the insert statements into UPDATE statements - Mailing list pgsql-general

Hi all

Synchronizing a table that is in two different databases(e.g db1 and db2).  

Please help me with this. I need to dump a table as INSERTS from db1 (postgres 9.1.2) and change the INSERT statements into UPDATE statements in order to apply that change in db2(postgres 8.3.0.112) which has the same table as db1. Where the record does not exist I need to insert that record.   There is more than 1000 INSERTS I need to convert to UPDATES for the same table. Please help .

Example:

Below it’s the INSERT from postgres 9.1.2 DATABASE which should convert to UPDATE statement.

INSERT INTO table (br_cde, br_desc, br_active, br_closed, grp_cde, ctry_cde, state_cde, br_addr_line1, br_addr_line2, br_addr_line3, br_addr_line4, br_addr_cde, br_post_addr_line1, br_post_addr_line2, br_post_addr_line3, br_post_addr_line4, br_post_addr_cde, br_phone, tax_cde, br_server_name, br_lang_ind, bureau_cde, br_risk_typ_cde, br_access_ccd, br_access_bureau, br_network_active, br_desc_short, br_is_trading, br_is_test, br_is_nomodem, br_is_whs, br_is_merch, br_is_cco, br_is_central, br_is_merch_active, br_central_brn, br_merch_brn, br_cco_brn, br_cgo_brn, br_cluster_brn, br_contact, br_tollfree, br_fax, br_telex, br_email, ops_cde, ops_director, br_cmpy_reg, br_tax_reg, audit_id, comp_cde, br_batch, br_release_pilot_type, br_is_order_active, bnk_id, br_class_cde, br_erp_xref, br_to_open, br_to_close, br_comments, br_is_hire, br_is_voucher, br_is_clear_center, br_is_headoffice, br_is_nsp_active, usr_pass_history, br_network_protocol, br_gen_ins_central_brn, br_cpi_ins_central_brn, br_rsc_area, br_rsc_perc, br_switch_deduc, br_tvlic_dealer_no, br_cco_followup, br_triad_live, br_do_cust_locking, br_is_rainbow, br_nca_live, br_ncr_reg_no, prov_cde, br_is_data_archive, br_icu_brn, br_living_expenses_live, br_ab_dorder_live, br_ab_receipts_active, br_spiv_max_alloc_perc, br_merger_brn, br_dep_bnk_acc, br_merchant_number, br_goods_ins_live, br_cgs_connection, whs_cde, br_crm_brn, subscription_active, br_prn_doc_default_active, br_use_jms, br_sso_active, br_paym8_properties, creditors_supp_no_prefix, br_block_debtors_obo, ccms_branch, br_is_ccms_live, ceres_conv_flag, cims_branch, br_is_cims_live, br_accept_sql_releases) VALUES ('9940', 'ELLERINES CENTRAL - 9940', true, NULL, '1', 'BAF', 'BAF', '209 SMIT STREET', 'BRA', 'Jgf', 'Jrg', '3025', '209 SMIT STREET', 'BRA', 'Jrg', NULL, '2017', '(4562) 712 1300', '1', 'dfgike.com', 'ENG', 'ITC', 'L', false, false, false, 'BATCH - 9940', false, false, false, false, false, false, true, false, '9940', NULL, NULL, '10.52.1.31', '9940', 'DOUG', NULL, '(4562) 712 1300' ‘, NULL, NULL, '001', NULL, '1969/02687/07', NULL, 0, NULL, '9940', NULL, false, NULL, NULL, NULL, NULL, NULL, NULL, false, false, false, false, false, 30, 'WS2~WS2', '1002', '1002', NULL, NULL, false, NULL, NULL, false, true, false, true, 'NC', NULL, true, NULL, true, true, NULL, NULL, NULL, NULL, NULL, true, 'oracle_live', NULL, NULL, true, NULL, true, false, NULL, NULL, NULL, NULL, NULL, NULL, NULL, false, false);

(For clarity, I'm going to call the table in question "foo".)

Option 1:  If you just want to do a full copy of db1.foo to db2.foo, then do that. Dump foo from db1, truncate foo in db2 and load db2.foo from the dump.  But you might not be able to do that (foreign keys and such).  In that case..

Option 2:  Dump the table from db1, then load it into a table with a different name ("bar") in db2.  Then you can do this:

begin;

update foo

set br_desc = bar.br_desc

, br_active = bar.br_active

(rest of columns)

where foo.br_cde = bar.br_cde;

insert into foo (br_cde, br_desc, br_active, ...)

select br_cde, br_desc, br_active, ....

from bar

where not exists

(  select *

   from foo

   where foo.br_cde = bar.br_cde);

commit;