spring 对 JdbcTemplate……的事务管理不用担心。就是对直接Jdbc实现的Dao事务管理有点小问题,如:我直接,用dataSource.getConnection()。spring是管理不了事务的。原因是Jdbc实现的Dao里的connection是自动提交的。要改用经过spring 处理过的connection = DataSourceUtil.getConnection(dataSource);才行。
我这有个例子——用户注册,有备份。只是例子而且。
下面是原始的Dao实现,
备份方法:
public User backUp(User user) throws SQLException {
Connection conn = dataSource.getConnection();
try {
PreparedStatement pstmt = conn.prepareStatement("insert into user(name) values (?)");
pstmt.setString(1, user.getName()+" 备份");
pstmt.executeUpdate();
pstmt = conn.prepareStatement("select last_insert_id()");
ResultSet rs = pstmt.executeQuery();
if(rs != null && rs.next()) {
user.setUId(rs.getInt(1));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
throw e;
} finally {
if(conn != null) {
try {
conn.close();
} catch (SQLException e) {
System.out.println("数据库连接关闭失败!");
}
}
}
return user;
}
现在要改成:
public User backUp(User user) throws SQLException {
Connection conn = DataSourceUtils.getConnection(dataSource);
try {
PreparedStatement pstmt = conn.prepareStatement("insert into user(name) values (?)");
pstmt.setString(1, user.getName()+" 备份");
pstmt.executeUpdate();
pstmt = conn.prepareStatement("select last_insert_id()");
ResultSet rs = pstmt.executeQuery();
if(rs != null && rs.next()) {
user.setUId(rs.getInt(1));
}
} catch (SQLException e) {
throw e;
} finally {
DataSourceUtils.releaseConnection(conn, dataSource);
}
return user;
}
然后你在逻辑层就可以用spring的任何方式管理事务了。
如:注册
public User register(User user) throws SQLException {
userDao.backUp(user);
userDao.insert(user);
return user;
}
posted on 2007-08-20 11:22
流浪汗 阅读(644)
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