Module org.apache.derby.tools
Package org.apache.derby.jdbc

Class ClientDataSource

  • All Implemented Interfaces:
    Serializable, Wrapper, Referenceable, CommonDataSource, DataSource, org.apache.derby.client.ClientDataSourceInterface
    Direct Known Subclasses:
    ClientConnectionPoolDataSource, ClientXADataSource
    public class ClientDataSource
extends BasicClientDataSource40
implements Referenceable
    This data source is suitable for a client/server use of Derby, running on full Java SE 6 and higher, corresponding to JDBC 4.0 and higher.

    ClientDataSource is a simple data source implementation that can be used for establishing connections in a non-pooling, non-distributed environment. The class ClientConnectionPoolDataSource can be used in a connection pooling environment, and the class ClientXADataSource can be used in a distributed, and pooling environment.

    The example below registers a DNC data source object with a JNDI naming service. 

     org.apache.derby.client.ClientDataSource dataSource = new org.apache.derby.client.ClientDataSource ();
 dataSource.setServerName ("my_derby_database_server");
 dataSource.setDatabaseName ("my_derby_database_name");
 javax.naming.Context context = new javax.naming.InitialContext();
 context.bind ("jdbc/my_datasource_name", dataSource);
    The first line of code in the example creates a data source object. The next two lines initialize the data source's properties. Then a Java object that references the initial JNDI naming context is created by calling the InitialContext() constructor, which is provided by JNDI. System properties (not shown) are used to tell JNDI the service provider to use. The JNDI name space is hierarchical, similar to the directory structure of many file systems. The data source object is bound to a logical JNDI name by calling Context.bind(). In this case the JNDI name identifies a subcontext, "jdbc", of the root naming context and a logical name, "my_datasource_name", within the jdbc subcontext. This is all of the code required to deploy a data source object within JNDI. This example is provided mainly for illustrative purposes. We expect that developers or system administrators will normally use a GUI tool to deploy a data source object.

    Once a data source has been registered with JNDI, it can then be used by a JDBC application, as is shown in the following example. 

     javax.naming.Context context = new javax.naming.InitialContext ();
 javax.sql.DataSource dataSource = (javax.sql.DataSource) context.lookup ("jdbc/my_datasource_name");
 java.sql.Connection connection = dataSource.getConnection ("user", "password");
    The first line in the example creates a Java object that references the initial JNDI naming context. Next, the initial naming context is used to do a lookup operation using the logical name of the data source. The Context.lookup() method returns a reference to a Java Object, which is narrowed to a javax.sql.DataSource object. In the last line, the DataSource.getConnection() method is called to produce a database connection.

    This simple data source subclass of BasicClientDataSource40 maintains it's own private password property.

    The specified password, along with the user, is validated by DERBY. This property can be overwritten by specifying the password parameter on the DataSource.getConnection() method call.

    This password property is not declared transient, and therefore may be serialized to a file in clear-text, or stored to a JNDI server in clear-text when the data source is saved. Care must taken by the user to prevent security breaches.

    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static String className__  

      • Fields inherited from class org.apache.derby.client.BasicClientDataSource

        CLEAR_TEXT_PASSWORD_SECURITY, ENCRYPTED_PASSWORD_SECURITY, ENCRYPTED_USER_AND_PASSWORD_SECURITY, propertyDefault_traceLevel, SSL_BASIC, SSL_OFF, SSL_PEER_AUTHENTICATION, STRONG_PASSWORD_SUBSTITUTE_SECURITY, TRACE_ALL, TRACE_CONNECTION_CALLS, TRACE_CONNECTS, TRACE_DIAGNOSTICS, TRACE_DRIVER_CONFIGURATION, TRACE_NONE, TRACE_PARAMETER_META_DATA, TRACE_PROTOCOL_FLOWS, TRACE_RESULT_SET_CALLS, TRACE_RESULT_SET_META_DATA, TRACE_STATEMENT_CALLS, TRACE_XA_CALLS, USER_ONLY_SECURITY

      • Fields inherited from interface org.apache.derby.client.ClientDataSourceInterface

        propertyDefault_portNumber, propertyDefault_retrieveMessageText, propertyDefault_securityMechanism, propertyDefault_serverName, propertyDefault_traceFileAppend, propertyDefault_user

    • Constructor Summary

      Constructors 
      Constructor Description
      ClientDataSource()
      Creates a simple DERBY data source with default property values for a non-pooling, non-distributed environment.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Reference getReference()  

      • Methods inherited from class org.apache.derby.client.BasicClientDataSource

        computeDncLogWriterForNewConnection, getClientSSLMode, getConnection, getConnection, getConnectionAttributes, getCreateDatabase, getDatabaseName, getDataSourceName, getDescription, getLoginTimeout, getLogWriter, getParentLogger, getPassword, getPassword, getPortNumber, getProperties, getRetrieveMessageText, getRetrieveMessageText, getSecurityMechanism, getSecurityMechanism, getSecurityMechanism, getServerName, getShutdownDatabase, getSsl, getSSLModeFromString, getTraceDirectory, getTraceDirectory, getTraceFile, getTraceFile, getTraceFileAppend, getTraceFileAppend, getTraceLevel, getTraceLevel, getUser, getUser, isWrapperFor, maxStatementsToPool, setConnectionAttributes, setCreateDatabase, setDatabaseName, setDataSourceName, setDescription, setLoginTimeout, setLogWriter, setPassword, setPortNumber, setRetrieveMessageText, setSecurityMechanism, setServerName, setShutdownDatabase, setSsl, setTraceDirectory, setTraceFile, setTraceFileAppend, setTraceLevel, setUser, tokenizeAttributes, unwrap

    • Constructor Detail

      • ClientDataSource

        public ClientDataSource()
        Creates a simple DERBY data source with default property values for a non-pooling, non-distributed environment. No particular DatabaseName or other properties are associated with the data source.

        Every Java Bean should provide a constructor with no arguments since many beanboxes attempt to instantiate a bean by invoking its no-argument constructor.