小编Jay*_*cal的帖子

我的JAVA程序中有以下代码,允许我将文件中的数据复制到Postgres数据库中:

Connection con = DriverManager.getConnection("jdbc:postgresql://localhost:####/myDb", 
                                                   "myuser", "mypassword"); 
CopyManager cm = new CopyManager((BaseConnection) con);
cm.copyIn("COPY prices FROM STDIN WITH DELIMITER AS ','", 
             new BufferedReader(new FileReader(filepath)), buffersize);

这段代码工作正常,但我想使用连接池来管理我的连接,因为我有这个代码运行多个文件.所以我使用了C3P0.

public static final ComboPooledDataSource cpds = new ComboPooledDataSource();

public class MyPooledConnection {
MyPooledConnection() throws PropertyVetoException {
    cpds.setDriverClass("org.postgresql.Driver"); 
    cpds.setJdbcUrl("jdbc:postgresql://localhost:5432/myStockDatabase"); 
    cpds.setUser("myUserName"); 
    cpds.setPassword("myPassword"); 
    cpds.setInitialPoolSize(4);
    cpds.setMinPoolSize(4);
    cpds.setMaxIdleTime(30);
    cpds.setMaxPoolSize(MAX_CONNECTIONS);
}

public static Connection getConnection() {
    return cpds.getConnection();
}
}

但是,当我从上面的连接池获得连接并尝试使用CopyManager时,如下例所示,代码不起作用

Connection pooled_con = MyPooledConnection.getConnection();
CopyManager cm = new CopyManager((BaseConnection) pooled_con);
cm.copyIn("COPY prices FROM STDIN WITH DELIMITER AS …