fix error when connect to Postgres 8.2.0(fix #5254) (#7266)

* fix error when connect to Postgres 8.2.0

* Update sequelize.md

* separating version check for clean code

* changelog: properly state oids for postgres

changelog.md

@@ -49,6 +49,7 @@
 - [INTERNAL] Updated to `generic-pool@3.1.6` [#7109](https://github.com/sequelize/sequelize/issues/7109)
 - [FIXED] findAll throws error if attributes option is formatted incorrectly [#7162](https://github.com/sequelize/sequelize/issues/7163)
 - [FIXED] previous gave wrong value back [#7189](https://github.com/sequelize/sequelize/pull/7189)
+- [FIXED] Connection error when fetching OIDs for unspported types in Postgres 8.2 or below [POSTGRES] [#5254](https://github.com/sequelize/sequelize/issues/5254)
 
 ## BC breaks:
 - `DATEONLY` now returns string in `YYYY-MM-DD` format rather than `Date` type

docs/api/sequelize.md

@@ -75,7 +75,6 @@ var sequelize = new Sequelize('mysql://localhost:3306/database', {})
 | [options.typeValidation=false] | Boolean | Run built in type validators on insert and update, e.g. validate that arguments passed to integer fields are integer-like. |
 | [options.benchmark=false] | Boolean | Print query execution time in milliseconds when logging SQL. |
 
-
 ***
 
 <a name="sequelize"></a>

lib/dialects/postgres/connection-manager.js

@@ -145,7 +145,8 @@ class ConnectionManager extends AbstractConnectionManager {
       }
 
       // oids for hstore and geometry are dynamic - so select them at connection time
-      if (dataTypes.HSTORE.types.postgres.oids.length === 0) {
+      const supportedVersion = this.sequelize.options.databaseVersion !== 0 && semver.gte(this.sequelize.options.databaseVersion, '8.3.0');
+      if (dataTypes.HSTORE.types.postgres.oids.length === 0 && supportedVersion) {
         query += 'SELECT typname, oid, typarray FROM pg_type WHERE typtype = \'b\' AND typname IN (\'hstore\', \'geometry\', \'geography\')';
       }