Passing client information to a database

Using a WebSphere® Application Server API or trace function, you can pass unique client information about every connection that originates from the same data source.

About this task

Some databases, such as DB2®, support a data source custom property that triggers your database servers to extract client information from WebSphere Application Server connections. (Consult the database documentation to see whether your product supports this capability and which property the product requires.) Be aware, however, that these properties introduces limited functionality in Application Server. Consequently, an application server connection manager incurs the following risky behaviors, which can result in the transfer of wrong client information to the database.
  • The connection manager cannot change client information about the data source, or the connections obtained from that data source, dynamically.
  • The connection manager must set the same client information about all connections that are obtained from that data source. For example, if you set ApplicationName as part of the data source clientInformation property, all connections from that data source have the same application name.

Application Server offers two methods of passing client information that provide the necessary connection management flexibility. Either method is used to set client information about some connections and not others, as well as set different client information about different database connections from the same data source.

Procedure

Example: Setting client information with the setClientInformation(Properties) API

You can set WebSphere Application Server client information on connections to pass that information to your database with this API.

The following example code calls setClientInformation(Properties) on the com.ibm.websphere.rsadapter.WSConnection object.

import com.ibm.websphere.rsadapter.WSConnection;
.....
try {
   InitialContext ctx = new InitialContext();
   //Perform a naming service lookup to get the DataSource object.
   DataSource ds = (javax.sql.DataSource)ctx.lookup("java:comp/jdbc/myDS");
  }catch (Exception e) {System.out.println("got an exception during lookup: " + e);}

  WSConnection conn = (WSConnection) ds.getConnection();
  Properties props = new properties();
  props.setProperty(WSConnection.CLIENT_ID, "user123");
  props.setProperty(WSConnection.CLIENT_LOCATION, "127.0.0.1");
  props.setProperty(WSConnection.CLIENT_ACCOUNTING_INFO, "accounting");
  props.setProperty(WSConnection.CLIENT_APPLICATION_NAME, "appname");
  props.setProperty(WSConnection.CLIENT_OTHER_INFO, "cool stuff");
  conn.setClientInformation(props);
  conn.close()

Parameters

props contains the client information to be passed. Possible values are:
  • WSConnection.CLIENT_ACCOUNTING_INFO
  • WSConnection.CLIENT_LOCATION
  • WSConnection.CLIENT_ID
  • WSConnection.CLIENT_APPLICATION_NAME
  • WSConnection.CLIENT_OTHER_INFO
  • WSConnection.OTHER_CLIENT_TYPE
Refer to the WSConnection documentation for more details on which client information is passed to the backend database. To reset the client information, call the method with a null parameter.

Exceptions

This API creates an SQL exception if the database issues an exception when setting the data.


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時間戳記圖示 前次更新: July 9, 2016 11:15
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