請看看下面的代碼如何回滾數據一次插入到3個表中?
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";
}
}
}
你剛纔在上面的代碼中看到的是你如何將數據插入到同一個數據庫中3頁不同的表。然而,所有這3個表格的「表單字段」都包含在一個表格中,因此所有這些表格都應該立即更新,如果發生什麼情況,那麼只需插入所有3個表格中的數據就應該回滾。舉個例子,下面是數據庫代碼應該如何被調用。
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)
所以我的問題是,如果出事了,我怎麼能回滾剛插入到所有3個表一次數據?
您應該使用'TRANSACTION':http://docs.oracle.com/javase/tutorial/jdbc/basics/transactions.html – 2014-08-27 08:14:24
只需回滾事務 – Antoniossss 2014-08-27 08:17:01
您應該使用相同的'Connection'實例來執行所有三個語句。然後調用'commit()'或'rollback()'一次。 每次調用'commit()'時,都不能回滾已提交的內容。 – Benjamin 2014-08-27 08:17:22