Question

我正在尝试对数据库执行3次操作。

计算行数（使用SELECT COUNT(*) FROM TestCaseTable）
插入行
再次计算行数

这是为了断言该行已成功插入数据库。

以下是执行这些操作的存根：

try {
    Class.forName(JDBC_DRIVER).newInstance();
    Connection connection =  DriverManager.getConnection(DB_URL, USERNAME, PASSWORD);
    statement = connection.createStatement();

    System.out.println("Checking before Insertion");
    ResultSet beforeinsertResultSet = statement.executeQuery("SELECT COUNT(*) FROM TestCaseTable");
    beforeinsertResultSet.next();
    int beforeInsertRowCount = beforeinsertResultSet.getInt(1);
    System.out.println("Before Insert "+beforeInsertRowCount);

    String insertTCQuery = "Insert into TestCaseTable ([Test Case Id], [Test Module Name], [Test Priority], [Test Designed By], "
            + "[Test Designed Date], [Test Executed By], [Test Execution Date], [Test Title], [Test Summary], [Pre-Condition],"
            + " [Dependencies], [Test Steps], [Test Data], [Expected result], [Post-Condition], [Actual Result], "
            + "[Test Status], [Notes]) "
            + "Values ('"+ testCaseIdIs +"', '"+ moduleNameIs +"', '"+ priorityIs +"', '"+ testDesignerIs +"', '"+ testDesignDateIs +"', "
                    + "'"+ testExecutedByIs +"', '"+ testExecutionDateIs +"', '"+ titleNameIs +"', '"+ descriptionIs +"', "
                            + "'"+ preConditionIs +"', '"+ dependenciesIs +"', '"+ testStepsIs +"', '"+ testDataIs +"',"
                                    + "'"+ expectedResultsIs +"', '"+ postConditionIs +"', '"+ actualResultIs +"', '"+ testStstusIs +"', "
                                            + "'"+ notesIs +"')";


    statement.executeUpdate(insertTCQuery);

    System.out.println("Checking after Insertion");
    ResultSet afterinsertResultSet = statement.executeQuery("SELECT COUNT(*) FROM TestCaseTable");
    afterinsertResultSet.next();
    int afterInsertRowCount = beforeinsertResultSet.getInt(1);
    System.out.println("Before Insert "+afterInsertRowCount);

    if(afterInsertRowCount == beforeInsertRowCount+1) {
        statusLabel.setText("Inserted Successfully!");
        statusLabel.setForeground(Color.GREEN);
    } else {
        statusLabel.setText("Error Inserting Test Case.");
    }

    beforeinsertResultSet.close();
    afterinsertResultSet.close();
    statement.close();
    connection.close();

} catch (InstantiationException | IllegalAccessException | ClassNotFoundException | SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

插入之前检查插入之前11检查插入之后检查 com.microsoft.sqlserver.jdbc.SQLServerException：结果集是关闭。在 com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError（SQLServerException.java:190）在 com.microsoft.sqlserver.jdbc.SQLServerResultSet.checkClosed（SQLServerResultSet.java:372）在 com.microsoft.sqlserver.jdbc.SQLServerResultSet.getInt（SQLServerResultSet.java:2309）在 com.gs.SaveTestCases.SaveTestCase $ ButtonClickListener.actionPerformed（SaveTestCase.java:321）在javax.swing.AbstractButton.fireActionPerformed（未知来源）at javax.swing.AbstractButton $ Handler.actionPerformed（Unknown Source）at javax.swing.DefaultButtonModel.fireActionPerformed（未知来源）at javax.swing.DefaultButtonModel.setPressed（未知来源）at javax.swing.plaf.basic.BasicButtonListener.mouseReleased（未知来自）java.awt.Component.processMouseEvent（未知来源）at javax.swing.JComponent.processMouseEvent（未知来源）at java.awt.Component.processEvent（未知来源）at java.awt.Container.processEvent（未知来源）at java.awt.Component.dispatchEventImpl（未知来源）at java.awt.Container.dispatchEventImpl（未知来源）at java.awt.Component.dispatchEvent（未知来源）at java.awt.LightweightDispatcher.retargetMouseEvent（未知来源）at java.awt.LightweightDispatcher.processMouseEvent（未知来源）at java.awt.LightweightDispatcher.dispatchEvent（未知来源）at java.awt.Container.dispatchEventImpl（未知来源）at java.awt.Window.dispatchEventImpl（未知来源）at java.awt.Component.dispatchEvent（未知来源）at java.awt.EventQueue.dispatchEventImpl（未知来源）at java.awt.EventQueue.access $ 500（未知来源）at java.awt.EventQueue $ 3.run（未知来源）at java.awt.EventQueue $ 3.run（未知来源）at java.security.AccessController.doPrivileged（Native Method）at java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（未知来源）at java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（未知来自）java.awt.EventQueue $ 4.run（未知来源）at java.awt.EventQueue $ 4.run（未知来源）at java.security.AccessController.doPrivileged（Native Method）at java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（未知来自）java.awt.EventQueue.dispatchEvent（未知来源）at java.awt.EventDispatchThread.pumpOneEventForFilters（未知来源） at java.awt.EventDispatchThread.pumpEventsForFilter（Unknown Source）在java.awt.EventDispatchThread.pumpEventsForHierarchy（未知来自java.awt.EventDispatchThread.pumpEvents（未知来源） at java.awt.EventDispatchThread.pumpEvents（Unknown Source）at java.awt.EventDispatchThread.run（未知来源）

正如您所看到的，第一行计数和插入成功执行但第三行操作（再次计算DB行）会出现“The result set is closed”错误。

有人可以告诉我哪里出错了吗？

编辑：在我的案例中，我所尝试的一切都没有用：

我创建了新的连接（connection1），声明（statement1）并将其用于第二次行计数。
插入后我已关闭beforeinsertResultSet

Answer 1

这使您的代码失败：

 int afterInsertRowCount = beforeinsertResultSet.getInt(1);

替换为

int afterInsertRowCount = afterinsertResultSet.getInt(1);

执行更新语句后，beforeinsertResultSet将关闭

在哪里找到代码：

ResultSet afterinsertResultSet = statement.executeQuery("SELECT COUNT(*) FROM TestCaseTable");
afterinsertResultSet.next();
int afterInsertRowCount = beforeinsertResultSet.getInt(1);
System.out.println("Before Insert "+afterInsertRowCount);

“结果集已关闭。”执行

1 个答案: