?MySQL Connector/J下載地址
http://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-3.1.12.zip/
主要新增功能是:
The driver now also supports "streaming" result sets, which allows users to retrieve large numbers of rows without using a large memory buffer. With newly added large-packet protocol support, the driver can send rows and BLOBs up to 2 gigabytes in size.
New features from the JDBC-3.0 API in the latest production version of MySQL Connector/J include getGeneratedKeys which allows users to retrieve auto-increment fields in a non-database-specific way. Auto-increment fields now work with object-relational mapping tools, as well as Enterprise Java Beans (EJB) servers with Container Managed Persistence (CMP) that support JDBC-3.0.
The development version is being refactored to support new features in conjunction with version 4.1 of the MySQL database server, including server-side prepared statements and improved handling of multiple simultaneous character sets, including Unicode in the UCS2 and UTF8 encodings.
Retrieval of Auto Generated Keys:
主要針對(duì)自動(dòng)增長(zhǎng)類型的數(shù)據(jù)取值的問題：
比如我們插入一條數(shù)據(jù)：
像原來jdbc2.0時(shí)我們這樣干的：
Int rowcount = stmt.executeUpdate (
"insert into LocalGeniusList (name) values ('Karen')"); // insert row
// now get the disk address – rowid – for the newly inserted row
ResultSet rs = stmt.executeQuery (
"select rowid from LocalGeniusList where name = 'Karen'");
jdbc3.0時(shí)我們可以在插入一條記錄時(shí)同時(shí)得到行數(shù)，
還可以訪問到自動(dòng)增長(zhǎng)的數(shù)據(jù)如：
Int rowcount = stmt.executeUpdate (
"insert into LocalGeniusList (name) values ('Karen'),
Statement.RETURN_GENERATED_KEYS); // insert row AND return key
ResultSet rs = stmt.getGeneratedKeys (); // key is automatically available
而有些數(shù)據(jù)庫不支持自動(dòng)增長(zhǎng)類型的數(shù)據(jù)，jdbc3.0也給出相應(yīng)的支持:
// insert the row and specify that you want the employee ID returned as the key
Int rowcount = stmt.executeUpdate (
"insert into LocalGeniusList (name) values ('Karen'),
"employeeID");
ResultSet rs = stmt.getGeneratedKeys (); // Karen's employeeID value is now available
要想了解更多的jdbc3.0可以參考下面的網(wǎng)站:
http://www.datadirect.com/developer/jdbc/topics/jdbc30/index.ssp
http://www-128.ibm.com/developerworks/java/library/j-jdbcnew/
http://www.onjava.com/pub/a/onjava/synd/2001/08/21/jdbc.html?page=3
jdbc4.0參考網(wǎng)站
http://www.theserverside.com/news/thread.tss?thread_id=34465
http://weblogs.java.net/blog/lancea/archive/2006/05/jdbc_40_sqlxml.html
http://java.sys-con.com/read/111252.htm
下載jdbc4.0規(guī)范
http://192.18.108.135/ECom/EComTicketServlet/BEGIN747810F695946413098EEF45230B1F12/-2147483648/1488530847/1/686798/686786/1488530847/2ts+/westCoastFSEND/jdbc-4.0-pr-spec-oth-JSpec/jdbc-4.0-pr-spec-oth-JSpec:2/jdbc4.0-pd-spec.pdf