Question

请查看以下代码

DBHandler.java

 @Override
    public String insertClient(String name, String address, String phone, String email, String country, Date visaGrantedDate, Date visaEntryDate)
    {
         int i=0;
       try
       {
           con.setAutoCommit(false);
           PreparedStatement ps = con.prepareStatement("insert into Client (Name, Address, Phone, Email, Country, Visa_Granted_Date, Visa_Entry_Date) values (?,?,?,?,?,?,?)");
           ps.setString(1,name);
           ps.setString(2,address);
           ps.setString(3,phone);
           ps.setString(4, email);
           ps.setString(5, country);
           ps.setDate(6, visaGrantedDate);
           ps.setDate(7, visaEntryDate);

           i = ps.executeUpdate();
           con.commit();

           if(i>0)
           {
               return "Data saved successfully";
           }
           else
           {
               return "Error in saving data";
           }
       }
       catch(SQLException e)
       {
           try
           {
               con.rollback();
               e.printStackTrace();
               return "Failed to save data. Data safely rolled back";
           }
           catch(Exception ee)
           {
               ee.printStackTrace();
               return "Failed to save data. Data roll back failed";
           }
       }
    }

    @Override
    public String insertPortfolio(String portfolioID, String clientName, double amount, double dicn, String lawyer, String introducer, String provider, String Types)
    {
        int i=0;
       try
       {
           con.setAutoCommit(false);
           PreparedStatement ps = con.prepareStatement("insert into Portfolio (portfolio_id, Client_Name, Amount, riteria_Net, Lawyer, Introducer, Provider, Types) values (?,?,?,?,?,?,?,?)");
           ps.setString(1,portfolioID);
           ps.setString(2,clientName);
           ps.setDouble(3,amount);
           ps.setDouble(4, dicn);
           ps.setString(5, lawyer);
           ps.setString(6, introducer);
           ps.setString(7, provider);
           ps.setString(8, Types);

           i = ps.executeUpdate();
           con.commit();

           if(i>0)
           {
               return "Data saved successfully";
           }
           else
           {
               return "Error in saving data";
           }
       }
       catch(SQLException e)
       {
           try
           {
               con.rollback();
               e.printStackTrace();
               return "Failed to save data. Data safely rolled back";
           }
           catch(Exception ee)
           {
               ee.printStackTrace();
               return "Failed to save data. Data roll back failed";
           }
       }
    }

    @Override
    public String insertClientFees(String portfolioID, double initialFees, double initialStepnaFees, double initialIntraFees, double ongoingFees, double ongoingStepnaFees, double ongoingIntraFees, double ongoingFabulaFees, double Fees, double otherFees, double VAT) 
    {
         int i=0;
       try
       {
           con.setAutoCommit(false);
           PreparedStatement ps = con.prepareStatement("insert into Client_Fees (portfolio_id, Initial_Fees, InitiaFees2, Initial_intra_Fees, Ongoing_Fees, Ongoing_octa_Fees, Ongoing_intra_Fees, Ongoing_fabula_Fees, Ongoing_stepna_Fees, Other, VAT) values (?,?,?,?,?,?,?,?,?,?,?)");
           ps.setString(1,portfolioID);
           ps.setDouble(2,initialintraFees); 
           //Rest of the data insert code has been removed


           i = ps.executeUpdate();
           con.commit();

           if(i>0)
           {
               return "Data saved successfully";
           }
           else
           {
               return "Error in saving data";
           }
       }
       catch(SQLException e)
       {
           try
           {
               con.rollback();
               e.printStackTrace();
               return "Failed to save data. Data safely rolled back";
           }
           catch(Exception ee)
           {
               ee.printStackTrace();
               return "Failed to save data. Data roll back failed";
           }
       }
    }

您在上面的代码中看到的是如何将数据插入同一数据库中的3个不同表中。但是，＆＃34;表单字段＆＃34;因为所有这三个表都包含在一个表单中，所以所有这些表都应该立即更新，如果发生某些事情，应该回滚插入所有3个表的数据。例如，下面是如何调用数据库代码。

MainUI.java

dbConnector.insertClient(name, address, phone, email, country, null, null);

dbConnector.insertPortfolio(clientPortfolioId, name, amount, dicn, name, country, phone, visaEntryDate);

dbConnector.insertClientFees(clientPortfolioId, initialFees, initialVisionFees, initialintraFees, ongoingFees, ongoingStepnaFees, ongoingIntraFees, ongoingFabulaFees, ongoingserFees, otherFees, VAT)

所以我的问题是，如果出现问题，我怎样才能将刚刚插入所有3个表的数据回滚到一起？

Answer 1

你应该简单地从他们之外的方法推出try...catch块：

try {
     con.setAutoCommit(false);

     dbConnector.insertClient(...
     dbConnector.insertPortfolio(...
     dbConnector.insertClientFees(...

     con.commit();
} catch(SQLException e) {
     try {
          con.rollback();
          e.printStackTrace();
           return "Failed to save data. Data safely rolled back";
     } 
     ...
}

Answer 2

您目前有3个交易，每个方法一个。您需要进行一次交易（一次setAutoCommit(false)，一次commit()或rollback()。

因此，您需要相应地重构代码。

Answer 3

你的con.setAutoCommit（false）;很好，但你可能不会做con.commit（）;在每三个功能完成之前......

try {
  dbConnector.disableAutoCommit();
  dbConnector.insertClient(name, address, phone, email, country, null, null);

  dbConnector.insertPortfolio(clientPortfolioId, name, amountInvested, dicn, name, country, phone, visaEntryDate);

  dbConnector.insertClientFees(clientPortfolioId, initialEdenhurstFees, initialVisionFees, initialIntroducerFees, ongoingEdenhurstFees, ongoingVisionFees, ongoingIntroducerFees, ongoingCastleFees, ongoingEdenCastleFees, otherFees, VAT)

  dbConnector.commit();
} catch(Esxception e) {
  dbConnector.rollback();
}

更像这样，你插入函数不应该执行setAutocommit（false）和commit（），rollback（）的东西，也不要自己捕获异常

如何一次回滚插入3个表的数据？

3 个答案: