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jvx:common:setup:connectin_pooling [2018/02/02 10:08] admin created |
jvx:common:setup:connectin_pooling [2020/06/19 11:41] (current) cduncan Edited for English grammar (capitalization, punctuation, correct verb conjugation) |
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| By default, connection pooling is disabled which means that a connection is created on open, and released on close of DBAccess. | By default, connection pooling is disabled which means that a connection is created on open, and released on close of DBAccess. | ||
| - | If connection pooling is enabled and autocommit was enabled, a connection is created on demand where needed, and is automatically released when no transaction is open after last call. This check will be queued via invokeFinally (see [[jvx:server:lco:call_events|Server-side Call events]]). | + | If connection pooling is enabled and autocommit enabled, a connection is created on demand where needed and is automatically released when no transaction is open after last call. This check will be queued via invokeFinally (see [[jvx:server:lco:call_events|Server-side Call events]]). |
| - | If connection pooling is enabled and autocommit was disabled, the connection will be released after each request as long as no transaction was started. If a transaction was started, the connection will be released with next commit or rollback call. | + | If connection pooling is enabled and autocommit disabled, the connection will be released after each request as long as no transaction was started. If a transaction was started, the connection will be released with next commit or rollback call. |
| - | To be able to configure custom connection settings, use eventConfigureConnection and eventUnconfigureConnection. Especially configure connection is important because it's not guaranteed that the same connection will be used for different calls. If you need custom settings, use events to configure the connection. The configure event will be triggered automatically by open and getConnection and unconfigure will be triggered by close and releaseConnection. | + | To be able to configure custom connection settings, use eventConfigureConnection and eventUnconfigureConnection. Configure connection is especially important because it's not guaranteed that the same connection will be used for different calls. If you need custom settings, use events to configure the connection. The configure event will be triggered automatically by open and getConnection and unconfigure will be triggered by close and releaseConnection. |
| - | If you don't use connection pooling, you can configure your connection without events, because there will be exactly one database connection per logged-in user. We recommend using event for connection configuration! | + | If you don't use connection pooling, you can configure your connection without events because there will be exactly one database connection per logged-in user. We recommend using event for connection configuration! |
| == Configuring Connection Pool == | == Configuring Connection Pool == | ||
| - | Using an application server it's possible to configure a DataSource resource. | + | Using an application server, it's possible to configure a datasource resource. |
| The JNDI name can be configured in your applications config.xml: | The JNDI name can be configured in your applications config.xml: | ||
| Line 84: | Line 84: | ||
| </file> | </file> | ||
| - | In this case, the DataSource has to be created manually, e.g. in Application life-cycle object: | + | In this case, the datasource has to be created manually, e.g. in application life cycle object: |
| <file java> | <file java> | ||
| Line 108: | Line 108: | ||
| </file> | </file> | ||
| - | and in the Session life-cycle object: | + | and in the session life cycle object: |
| <file java> | <file java> | ||
| - | protected DBAccess getDBAccess() throws Exception | + | protected DBAccess getDBAccess() throws exception |
| { | { | ||
| DBAccess dba = (DBAccess)get("dBAccess"); | DBAccess dba = (DBAccess)get("dBAccess"); | ||
| Line 129: | Line 129: | ||
| </file> | </file> | ||
| - | == Configuring stateful Database connections == | + | == Configuring Stateful Database Connections == |
| - | It is possible to configure every connection, taken from the connection pool. In Oracle for example it's possible to store user information in packages. | + | It is possible to configure every connection taken from the connection pool. In Oracle, for example, it's possible to store user information in packages. |
| <file java> | <file java> | ||