Examples of org.apache.derby.jdbc.ClientDataSource

org.apache.derby.jdbc.ClientDataSource
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. Use these DataSources if your application runs under JDBC3.0 or JDBC2.0, that is, on the following Java Virtual Machines:
- JDBC 3.0 - Java 2 - JDK 1.4, J2SE 5.0
- JDBC 2.0 - Java 2 - JDK 1.2,1.3
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 ClientBaseDataSource maintains it's own private password property.
The specified password, along with the user, is validated by DERBY. This property can be overwritten by specifing 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.


    private SQLException _internal_stopSlave(String slaveServerHost, 
            int slaveServerPort, 
            String dbPath) {
        util.DEBUG("_internal_stopSlave");
        ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
        ds.setDatabaseName(dbPath);
        ds.setServerName(slaveServerHost);
        ds.setPortNumber(slaveServerPort);
        ds.setConnectionAttributes("internal_stopslave=true");
        try {
            Connection conn = ds.getConnection(); // 
            conn.close();
            return null; // If successfull - 
        } catch (SQLException se) {
            util.DEBUG(se.getErrorCode()+" "+se.getSQLState()+" "+se.getMessage());
            return se;

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    SQLException _failOver(String serverHost, int serverPort, String dbPath) 
    {
        util.DEBUG("BEGIN _failOver"); 
        ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
        ds.setDatabaseName(dbPath);
        ds.setServerName(serverHost);
        ds.setPortNumber(serverPort);
        ds.setConnectionAttributes("failover=true");
        try {
            Connection conn = ds.getConnection(); // 
            conn.close();
            util.DEBUG("END   _failOver. Got Connection");
            return null; // If successfull - could only happen on slave after a master stopMaster.
        } catch (SQLException se) {
            util.DEBUG("END   _failOver. " + se.getSQLState());

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            int serverPort,
            String dbPath) 
        throws SQLException 
    {
        util.DEBUG("_startSlaveTrueAndCreateTrue");
        ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
        ds.setDatabaseName(dbPath);
        ds.setServerName(serverHost);
        ds.setPortNumber(serverPort);
        ds.setConnectionAttributes("startSlave=true;create=true");
        try {
            Connection conn = ds.getConnection(); // XRE10 - REPLICATION_CONFLICTING_ATTRIBUTES
            conn.close();
            return null; // Should never get here.
        } catch (SQLException se) {
            return se;
        }

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    }


    SQLException _stopMaster(String masterServerHost, int masterServerPort, String dbPath) 
    {
        util.DEBUG("_stopMaster");
        ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
        ds.setDatabaseName(dbPath);
        ds.setServerName(masterServerHost);
        ds.setPortNumber(masterServerPort);
        ds.setConnectionAttributes("stopMaster=true");
        try {
            Connection conn = ds.getConnection(); // 
            conn.close();
            return null; // If successfull.
        } catch (SQLException se) {
            util.DEBUG(se.getErrorCode()+" "+se.getSQLState()+" "+se.getMessage());
            return se;

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    SQLException _stopSlave(String slaveServerHost, int slaveServerPort,
            String dbPath) 
        throws SQLException
    {
        util.DEBUG("_stopSlave");
        ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
        ds.setDatabaseName(dbPath);
        ds.setServerName(slaveServerHost);
        ds.setPortNumber(slaveServerPort);
        ds.setConnectionAttributes("stopSlave=true");
        try {
            Connection conn = ds.getConnection();
            conn.close();
            return null; // If successfull.
        } catch (SQLException se) {
            return se;
        }

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        String sState = "CONNECTED";
        String msg = null;
        Thread.sleep(waitTime); // .... until stable...
        try
        {
            ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
            ds.setDatabaseName(fullDbPath);
            ds.setServerName(serverHost);
            ds.setPortNumber(serverPort);
            Connection conn = ds.getConnection();
            conn.close();
        }
        catch ( SQLException se )
        {
            errCode = se.getErrorCode();

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        String msg = null;
        while ( count++ <= tries )
        {
            try
            {
                ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
                ds.setDatabaseName(fullDbPath);
                ds.setServerName(serverHost);
                ds.setPortNumber(serverPort);
                Connection conn = ds.getConnection();
                util.DEBUG("Got connection after " 
                        + (count-1) +" * "+ sleepTime + " ms.");
                conn.close();
                return;
            }

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        String msg = null;
        while ( count++ <= tries )
        {
            try
            {
                ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
                ds.setDatabaseName(fullDbPath);
                ds.setServerName(serverHost);
                ds.setPortNumber(serverPort);
                Connection conn = ds.getConnection();
                // Should never get here!
                conn.close();
                assertTrue("Expected SQLState'"+expectedState
                            + "', but got connection!",
                        false);

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                     * using DriverManager.getConnection() concurrently
                     * in startMaster and startSlave!
                    Class.forName(DRIVER_CLASS_NAME); // Needed when running from classes!
                    conn = DriverManager.getConnection(URL);
                     */
                    ClientDataSource ds = new org.apache.derby.jdbc.ClientDataSource();
                    ds.setDatabaseName(masterDatabasePath+FS+masterDbSubPath+FS+dbName);
                    ds.setServerName(masterHost);
                    ds.setPortNumber(masterServerPort);
                    ds.setConnectionAttributes("startMaster=true"
                            +";slaveHost="+slaveReplInterface
                            +";slavePort="+slaveReplPort);
                    conn = ds.getConnection();
                    
                    done = true;
                    conn.close();
                    util.DEBUG("startMaster_direct connected in " + count + " * 100ms.");
                }

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     */
    public void testClientDSConnectionAttributes() throws SQLException {
        if (usingEmbedded())
            return;
        
        ClientDataSource ds = new ClientDataSource();


        // DataSource - EMPTY; expect error 08001 in all cases
        // 08001: Required Derby DataSource property databaseName not set.
        dsConnectionRequests(new String[]  
            {"08001","08001","08001","08001",
             "08001","08001","08001","08001","08001"}, ds);


        // DataSource - connectionAttributes=databaseName=<valid name>
        ds.setConnectionAttributes("databaseName=" + dbName);
        dsConnectionRequests(new String[]  
            {"08001","08001","08001","08001",
             "08001","08001","08001","08001","08001"}, ds);
        ds.setConnectionAttributes(null);


        // Test that (invalid) database name specified in connection
        // attributes is not used
        // DataSource - databaseName=<valid db> and 
        // connectionAttributes=databaseName=kangaroo
        ds.setConnectionAttributes("databaseName=kangaroo");
        ds.setDatabaseName(dbName);
        dsConnectionRequests(new String[]  
            {"OK","08001","OK","OK",
             "08001","08001","OK","OK","OK"}, ds);
        ds.setConnectionAttributes(null);
        ds.setDatabaseName(null);


    } // End testClientDSConnectionAttributes

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