Using DBCP and Retrieving LastInsertID From An auto_incremented key

I am using Apache Tomcat 4.1.24 with Connector/J 3.0.7 and Mysql 4.0.12. I am trying to use DBCP but need to be able to get the LastInsertID From An auto_incremented key. I have read many examples that say to use "select LAST_INSERT_ID()" with a javax.sql.PreparedStatement but have concerns about this due to the following comment in com.mysql.jdbc.Statement http://www.mysql.com/downloads/api-jdbc-stable.html
* getLastInsertID returns the value of the auto_incremented key
* after an executeQuery() or excute() call.
* <p>
* This gets around the un-threadsafe behavior of
* "select LAST_INSERT_ID()" which is tied to the Connection
* that created this Statement, and therefore could have had
* many INSERTS performed before one gets a chance to call
* "select LAST_INSERT_ID()".
* @return the last update ID.
public long getLastInsertID() {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "getLastInsertID", args);
return lastInsertId;
I have posted a detailed description of my problems with using com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource which will provide the com.mysql.jdbc.PreparedStatement.getLastInsertID() method shown above, in the following thread http://forum.java.sun.com/thread.jsp?forum=48&thread=396427&tstart=15&trange=15. The connections not being reused with com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource is my reason for wanting to use DBCP.
Thanks For Your Help
James

I have solved the problem that I had by implementing the Jakarta Commons DBCP and the following code to get last insert ids:
PreparedStatement ps = con.prepareStatement("INSERT INTO table1 (description) VALUES(?)", 1);
//The 1 makes it get auto_keys
ps.setString(1, "2222222");
ps.executeUpdate();
ResultSet rs = ps.getGeneratedKeys();
long insertID = -1;
if(rs.next()){
insertID = rs.getLong(1);
I only have one auto increment column in the table so I have just used this simple con.prepareStatement. If you have more than one auto increment column than you can use one of the other con.prepareStatement methods to create your prepared statement.
Using the Jakarta Commons DBCP to pool the connections, I was able to get more than twice the performance of using com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource. I even pounded my implementation using Jakarta Commons DBCP with thousands of requests(10 simultaneous threads) using Apache JMeter and it scaled very well. The pool grew up to about 10 Database connections that were reused for the duration of over 15,000 requests.
I am very confident due to this performance difference and the experiment that I will insert below that com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource is not reusing database connections.
The following is the result of using com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource to pool connections and refreshing a page a bunch of times. The connection are not reused in the pool.
-------------------------------------------------------------------------------------+
| Id | User | Host | db | Command | Time | State | Info |
-------------------------------------------------------------------------------------+
| 554 | test | localhost:35261 | ebayListings | Sleep | 1475 | | |
| 940 | ebayRW | localhost:35949 | ebayListings | Sleep | 18 | | |
| 941 | ebayRW | localhost:35950 | ebayListings | Sleep | 18 | | |
| 942 | ebayRW | localhost:35951 | ebayListings | Sleep | 18 | | |
| 943 | ebayRW | localhost:35952 | ebayListings | Sleep | 18 | | |
| 956 | ebayRW | localhost:35965 | ebayListings | Sleep | 17 | | |
| 957 | ebayRW | localhost:35966 | ebayListings | Sleep | 17 | | |
| 958 | ebayRW | localhost:35967 | ebayListings | Sleep | 17 | | |
| 959 | ebayRW | localhost:35968 | ebayListings | Sleep | 17 | | |
| 960 | ebayRW | localhost:35969 | ebayListings | Sleep | 17 | | |
| 961 | ebayRW | localhost:35970 | ebayListings | Sleep | 17 | | |
| 962 | ebayRW | localhost:35971 | ebayListings | Sleep | 17 | | |
| 963 | ebayRW | localhost:35972 | ebayListings | Sleep | 17 | | |
| 964 | ebayRW | localhost:35973 | ebayListings | Sleep | 17 | | |
| 965 | ebayRW | localhost:35974 | ebayListings | Sleep | 17 | | |
| 966 | ebayRW | localhost:35975 | ebayListings | Sleep | 16 | | |
| 967 | ebayRW | localhost:35976 | ebayListings | Sleep | 16 | | |
| 968 | ebayRW | localhost:35977 | ebayListings | Sleep | 16 | | |
| 969 | ebayRW | localhost:35978 | ebayListings | Sleep | 16 | | |
| 983 | ebayRW | localhost:35993 | ebayListings | Sleep | 6 | | |
| 984 | ebayRW | localhost:35994 | ebayListings | Sleep | 6 | | |
| 985 | ebayRW | localhost:35995 | ebayListings | Sleep | 6 | | |
| 986 | ebayRW | localhost:35996 | ebayListings | Sleep | 6 | | |
| 987 | ebayRW | localhost:35997 | ebayListings | Sleep | 6 | | |
| 988 | ebayRW | localhost:35998 | ebayListings | Sleep | 6 | | |
| 989 | ebayRW | localhost:35999 | ebayListings | Sleep | 6 | | |
| 990 | ebayRW | localhost:36000 | ebayListings | Sleep | 6 | | |
| 991 | ebayRW | localhost:36001 | ebayListings | Sleep | 6 | | |
| 992 | ebayRW | localhost:36002 | ebayListings | Sleep | 6 | | |
| 993 | ebayRW | localhost:36003 | ebayListings | Sleep | 5 | | |
| 994 | ebayRW | localhost:36004 | ebayListings | Sleep | 5 | | |
| 995 | ebayRW | localhost:36005 | ebayListings | Sleep | 5 | | |
| 996 | ebayRW | localhost:36006 | ebayListings | Sleep | 5 | | |
| 1003 | ebayRW | localhost:36014 | ebayListings | Sleep | 5 | | |
| 1009 | ebayRW | localhost:36020 | ebayListings | Sleep | 4 | | |
| 1010 | ebayRW | localhost:36021 | ebayListings | Sleep | 4 | | |
| 1011 | ebayRW | localhost:36022 | ebayListings | Sleep | 4 | | |
| 1012 | ebayRW | localhost:36023 | ebayListings | Sleep | 4 | | |
| 1013 | ebayRW | localhost:36024 | ebayListings | Sleep | 4 | | |
| 1014 | ebayRW | localhost:36025 | ebayListings | Sleep | 4 | | |
| 1015 | ebayRW | localhost:36026 | ebayListings | Sleep | 4 | | |
| 1016 | ebayRW | localhost:36027 | ebayListings | Sleep | 4 | | |
| 1017 | ebayRW | localhost:36028 | ebayListings | Sleep | 4 | | |
| 1018 | ebayRW | localhost:36029 | ebayListings | Sleep | 4 | | |
| 1019 | root | localhost | | Query | 0 | | show processlist |
-------------------------------------------------------------------------------------+
After a while it will just terminates all connections and start piling them up again. Notice the higher ID numbers.
-------------------------------------------------------------------------------------+
| Id | User | Host | db | Command | Time | State | Info |
-------------------------------------------------------------------------------------+
| 554 | test | localhost:35261 | ebayListings | Sleep | 1523 | | |
| 1042 | ebayRW | localhost:36061 | ebayListings | Sleep | 7 | | |
| 1043 | ebayRW | localhost:36062 | ebayListings | Sleep | 7 | | |
| 1046 | ebayRW | localhost:36067 | ebayListings | Sleep | 6 | | |
| 1047 | ebayRW | localhost:36068 | ebayListings | Sleep | 6 | | |
| 1048 | ebayRW | localhost:36069 | ebayListings | Sleep | 6 | | |
| 1049 | ebayRW | localhost:36070 | ebayListings | Sleep | 6 | | |
| 1050 | ebayRW | localhost:36071 | ebayListings | Sleep | 6 | | |
| 1051 | ebayRW | localhost:36072 | ebayListings | Sleep | 6 | | |
| 1052 | ebayRW | localhost:36073 | ebayListings | Sleep | 6 | | |
| 1053 | ebayRW | localhost:36074 | ebayListings | Sleep | 6 | | |
| 1054 | root | localhost | | Query | 0 | | show processlist |
-------------------------------------------------------------------------------------+
I have switched all of my existing Web Applications over to Jakarta Commons DBCP which only involved changing 3 lines of code per file and will allow me the totally change the underlying database without modifying my individual JSPs and Servlets. Jakarta Commons DBCP is a great solution to the Connection Pool Problem and has worked for my needs.
James Fredley

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There is still a need to set the NLS_LANG so that correct conversion can take place between the client and the >>database.
For e.g, when retrieving if we set the NLS_LANG character set to ZHS16GBK (chinese) and the data store in >>unicode in database is E.G (THAI) , then the conversion would be wrong .am i right on this point for UNICODE supported client ?
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Million thanks again for sharing.
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