我想运行我的应用程序与tomcat第一次,我正在调试/运行应用程序其工作正常。但是当我第二次尝试运行时,出现错误“XJ040”。与关闭数据库与servlet连接的问题
"Failed to start database 'C:\Documents and Settings\vitaly87\.netbeans- derby\articals' with class loader WebappClassLoader
context: /WebApplication1
delegate: false
repositories:
我认为问题是由于一些错误关闭connections.Because当我停止我的服务器,问题消失了,直到第二次运行。
这里的代码:如果你有一个例外
private Connection connect = null;
//private Statement stmt = null;
private PreparedStatement preparedStatement = null;
private ResultSet resultSet = null;
public ArrayList<story> stories=new ArrayList<story>();
void getStories(String version) throws SQLException{
try{
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
}catch(ClassNotFoundException e){
System.out.println(e);
}
connect = DriverManager.getConnection("jdbc:derby:C:\\Documents and Settings\\vitaly87\\.netbeans-derby\\articals", "admin", "admin");
// statement = connect.createStatement();
int ArticlesId= Integer.parseInt(version);
preparedStatement = connect.prepareStatement("SELECT * FROM admin.articles where id>"+ArticlesId+"");
resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
stories.add(new story(resultSet.getString("title"),resultSet.getString("date"),resultSet.getString("text")));
}
close();
}
//close connection
private void close() {
try {
if (resultSet != null) {
resultSet.close();
}
if (connect != null) {
connect.close();
}
} catch (Exception e) {
}
感谢在最后
connect = DriverManager.getConnection(...)
try
{
// use connection
}
finally
{
try
{
connect.close()
}
catch (SQLException e)
{
// log e
}
}
帮助
为什么不在close函数的开始处放一个print语句来查看它是否被运行。 – BobTurbo