Oracle XA例子

/*
A simple 2 phase XA demo. Both the branches talk to different RMS
Need 2 java enabled 8.1.6 databases to run this demo.
-> start-1
-> start-2
-> Do some DML on 1
-> Do some DML on 2
-> end 1
-> end 2
-> prepare-1
-> prepare-2
-> commit-1
-> commit-2
Please supply hostname as args[0],
port number as args[1],
and service_name as args[2]
to make the URL2 when run this.
as: java XA4 myhost 5521 orcl.us.oracle.com

Please use jdk1.2 or later version
*/

// You need to import the java.sql package to use JDBC
import java.sql.*;
import javax.sql.*;
import oracle.jdbc.*;
import oracle.jdbc.pool.*;
import oracle.jdbc.xa.OracleXid;
import oracle.jdbc.xa.OracleXAException;
import oracle.jdbc.xa.client.*;
import javax.transaction.xa.*;

class XA4
{
public static void main (String args [])
throws SQLException
{
if ( args.length != 3 )
{
System.out.println("usage: java XA4 <host> <port> <service_name>");
System.exit (0);
}

String host = args[0];
String port = args[1];
String service_name = args[2];

try
{
String URL1 = "jdbc:oracle:oci8:@";
String URL2 = "jdbc:oracle:thin:@(description=(address=(host=" + host
+ ")(protocol=tcp)(port=" + port + "))(connect_data=(service_name="
+ service_name + ")))";

try {
String url1 = System.getProperty("JDBC_URL");
if (url1 != null)
URL1 = url1;
} catch (Exception e) {
// If there is any security exception, ignore it
// and use the default
}

try {
String url2 = System.getProperty("JDBC_URL_2");
if (url2 != null)
URL2 = url2;
} catch (Exception e) {
// If there is any security exception, ignore it
// and use the default
}

// Create a OracleDataSource instance and set properties
OracleDataSource odsa = new OracleDataSource();
odsa.setUser("hr");
odsa.setPassword("hr");
odsa.setURL(URL1);

Connection conna = odsa.getConnection();

// Prepare a statement to create the table
Statement stmta = conna.createStatement ();

// Create another OracleDataSource
OracleDataSource odsb = new OracleDataSource();
odsb.setUser("hr");
odsb.setPassword("hr");
odsb.setURL(URL2);
Connection connb = odsb.getConnection();

Statement stmtb = connb.createStatement ();

// close odsa and odsb won't affect
// previously generated connections and statements
odsa.close();
odsb.close();

try
{
stmta.execute ("delete from jobs where job_id = 'SC_STUFF'");
}
catch (SQLException e)
{
// Ignore an error here
}

try
{
stmtb.execute ("delete from regions where region_id > 100");
}
catch (SQLException e)
{
// Ignore an error here
}

// Create a XADataSource instance
OracleXADataSource oxds1 = new OracleXADataSource();
oxds1.setURL(URL1);
oxds1.setUser("hr");
oxds1.setPassword("hr");

OracleXADataSource oxds2 = new OracleXADataSource();
oxds2.setURL(URL2);
oxds2.setUser("hr");
oxds2.setPassword("hr");

// Get a XA connection to the underlying data source
XAConnection pc1 = oxds1.getXAConnection();

// We can use the same data source
XAConnection pc2 = oxds2.getXAConnection();

// Get the Physical Connections
Connection conn1 = pc1.getConnection();
Connection conn2 = pc2.getConnection();

// Get the XA Resources
XAResource oxar1 = pc1.getXAResource();
XAResource oxar2 = pc2.getXAResource();

// Create the Xids With the Same Global Ids
Xid xid1 = createXid(1);
Xid xid2 = createXid(2);

// Start the Resources
oxar1.start (xid1, XAResource.TMNOFLAGS);
oxar2.start (xid2, XAResource.TMNOFLAGS);

// Do something with conn1 and conn2
DoSomeWork1 (conn1);
DoSomeWork2 (conn2);

// END both the branches -- THIS IS MUST
oxar1.end(xid1, XAResource.TMSUCCESS);
oxar2.end(xid2, XAResource.TMSUCCESS);

// Prepare the RMs
int prp1 = oxar1.prepare (xid1);
int prp2 = oxar2.prepare (xid2);

System.out.println("Return value of prepare 1 is " + prp1);
System.out.println("Return value of prepare 2 is " + prp2);

boolean do_commit = true;

if (!((prp1 == XAResource.XA_OK) || (prp1 == XAResource.XA_RDONLY)))
do_commit = false;

if (!((prp2 == XAResource.XA_OK) || (prp2 == XAResource.XA_RDONLY)))
do_commit = false;

System.out.println("do_commit is " + do_commit);
System.out.println("Is oxar1 same as oxar2 ? " + oxar1.isSameRM(oxar2))
;

if (prp1 == XAResource.XA_OK)
if (do_commit)
oxar1.commit (xid1, false);
else
oxar1.rollback (xid1);

if (prp2 == XAResource.XA_OK)
if (do_commit)
oxar2.commit (xid2, false);
else
oxar2.rollback (xid2);

// Close connections
conn1.close();
conn1 = null;
conn2.close();
conn2 = null;

pc1.close();
pc1 = null;
pc2.close();
pc2 = null;

ResultSet rset = stmta.executeQuery ("select job_id, job_title from jobs");
System.out.println("\ncontents of table jobs:\n");
while (rset.next())
System.out.println(rset.getString(1) + " " + rset.getString(2));

rset.close();
rset = null;

rset = stmtb.executeQuery ("select region_id, region_name from regions order by region_id");
System.out.println("\ncontents of table regions:\n");
while (rset.next())
System.out.println(rset.getInt(1) + " " + rset.getString(2));

rset.close();
rset = null;

stmta.close();
stmta = null;
stmtb.close();
stmtb = null;

conna.close();
conna = null;
connb.close();
connb = null;

} catch (SQLException sqe)
{
sqe.printStackTrace();
} catch (XAException xae)
{
if (xae instanceof OracleXAException) {
System.out.println("XA Error is " +
((OracleXAException)xae).getXAError());
System.out.println("SQL Error is " +
((OracleXAException)xae).getOracleError());
}
}
}

static Xid createXid(int bids)
throws XAException
{
byte[] gid = new byte[1]; gid[0]= (byte) 9;
byte[] bid = new byte[1]; bid[0]= (byte) bids;
byte[] gtrid = new byte[64];
byte[] bqual = new byte[64];
System.arraycopy (gid, 0, gtrid, 0, 1);
System.arraycopy (bid, 0, bqual, 0, 1);
Xid xid = new OracleXid(0x1234, gtrid, bqual);
return xid;
}

private static void DoSomeWork1 (Connection conn)
throws SQLException
{
// Create a Statement
Statement stmt = conn.createStatement ();

int cnt = stmt.executeUpdate ("insert into jobs values ('SC_STUFF', 'Security Stuff', null, null)");

System.out.println("No of rows Affected " + cnt);

stmt.close();
stmt = null;
}

private static void DoSomeWork2 (Connection conn)
throws SQLException
{
// Create a Statement
Statement stmt = conn.createStatement ();

int cnt = stmt.executeUpdate ("insert into regions values (101, 'Africa')");

System.out.println("No of rows Affected " + cnt);

stmt.close();
stmt = null;
}

}