B.7. PostgreSQL
Example B.23. PostgreSQL Local-TX Datasource
<?xml version="1.0" encoding="UTF-8"?> <datasources> <local-tx-datasource> <jndi-name>PostgresDS</jndi-name> <connection-url>jdbc:postgresql://[servername]:[port]/[database name]</connection-url> <driver-class>org.postgresql.Driver</driver-class> <user-name>x</user-name> <password>y</password> <!-- sql to call when connection is created <new-connection-sql>some arbitrary sql</new-connection-sql> --> <!-- sql to call on an existing pooled connection when it is obtained from pool <check-valid-connection-sql>some arbitrary sql</check-valid-connection-sql> --> <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) --> <metadata> <type-mapping>PostgreSQL 8.0</type-mapping> </metadata> </local-tx-datasource> </datasources>
Important
XA Transactions are denied if
max_prepared_transactions
uses the default value (0) in PostgreSQL v8.4 and v8.2.
PostgreSQL user documentation recommends you set the
max_prepared_transactions
value to meet or exceed the value of max_connections
so every session can have a prepared transaction pending.
For more information, refer to the PostgreSQL v8.4 User Documentation, located at http://www.postgresql.org/docs/8.4/interactive/runtime-config-resource.html#GUC-MAX-PREPARED-TRANSACTIONS
Example B.24. PostgreSQL XA Datasource
This configuration works for PostgreSQL 8.x and later.
<?xml version="1.0" encoding="UTF-8"?> <datasources> <xa-datasource> <jndi-name>PostgresDS</jndi-name> <xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class> <xa-datasource-property name="ServerName">[servername]</xa-datasource-property> <xa-datasource-property name="PortNumber">5432</xa-datasource-property> <xa-datasource-property name="DatabaseName">[database name]</xa-datasource-property> <xa-datasource-property name="User">[username]</xa-datasource-property> <xa-datasource-property name="Password">[password]</xa-datasource-property> <track-connection-by-tx></track-connection-by-tx> </xa-datasource> </datasources>