Question

我有一些OAF代码，我正在启动sql连接但是当我试图关闭它时，它会抛出sql异常。这是代码。

    try
    {
        conn = 
        (OracleConnection)oadbtransactionimpl.getJdbcConnection();
        String queryForEmpty = 
            "select ... query here"; 
        projectDetailsStatment = 
                conn.prepareStatement(queryForEmpty);
        projectDetailsStatment.setString(1,sprojectid);
        ResultSet rs = projectDetailsStatment.executeQuery();

    }
    catch(SQLException e)
   {
       String sqlErrMsg = e.getMessage();
       throw new OAException((new StringBuilder()).append("handle exception here:").append(sqlErrMsg).toString(), (byte)0);
   }
   finally
   {
      conn.close(); // throws exception here
   }

Answer 1

尝试使用try和catch子句

附上结束代码

    try
    {
        conn = 
        (OracleConnection)oadbtransactionimpl.getJdbcConnection();
        String queryForEmpty = 
            "select ... query here"; 
        projectDetailsStatment = 
                conn.prepareStatement(queryForEmpty);
        projectDetailsStatment.setString(1,sprojectid);
        ResultSet rs = projectDetailsStatment.executeQuery();

    }
    catch(SQLException e)
   {
       String sqlErrMsg = e.getMessage();
       throw new OAException((new StringBuilder()).append("Exception in Finding Project Type:").append(sqlErrMsg).toString(), (byte)0);
   }
   finally
   {
      try{
      conn.close(); // throws exception here
      }
        catch(SQLException e)
      {
        //your code here
      }
   }

Answer 2

任何JDBC操作的基本方案都非常简单：

获取连接。
创建声明。
执行语句并获取ResultSet。
处理ResultSet。
关闭所有内容：ResultSet，声明和连接。

BAD SOLUTION

public void handleJDBC()  {
    try {
        DataSource dataSource = getDataSource();
        Connection connection = dataSource.getConnection();
        operation(connection)
        connection.close();
    } catch (SQLException e) {
        //do something here
    }
}

良好做法

finally {
        if (connection != null) {
            try {
            connection.close();
        } catch (SQLException e) {
            if (exception != null) {
                exception = new DoubleException(exception, e);
            } else {
                exception = e;
            }
        }
        }
    }
    if (exception != null) {
        throw exception;
    }

尝试关闭finally子句中的连接时发生SQL异常

2 个答案: