我在另一个论坛上询问了我的代码，但是有一个新创建的问题。
第一个准备好的语句只执行。我尝试交换CUSTOMER表和ORDERS表的预处理语句的位置。当CUSTOMER表格准备好的声明位于第一个位置时，它可以工作，但如果我将它交换到ORDERS表，它就不会工作，反之亦然。所以这意味着只执行第一个预处理语句。
这是我的程序逻辑：here。
我的代码：
payment = Integer.parseInt(custPaymentTextField.getText());
try{
if(payment>=total){
change = payment - total;
JOptionPane.showMessageDialog(this, "Thank you for shopping! Your change is "+change, "Exiting", JOptionPane.INFORMATION_MESSAGE);
Connection conn = null;
PreparedStatement pstmt = null;
PreparedStatement pstmt2 = null;
PreparedStatement pstmt3 = null;
String URL = "jdbc:oracle:thin:@VAIO:49160:xe";
String USER = "mariel";
String PASS = "1234";
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
try {
String name = nameTextField.getText();
String address = addressTextField.getText();
int contact = Integer.parseInt(contactTextField.getText());
conn = DriverManager.getConnection(URL, USER, PASS);
String sql2 = "INSERT INTO CUSTOMER " +
"VALUES(CustNumSeq.NEXTVAL, ?, ?, ?)";
String generatedColumns[] = {"CUST_NUM"};
pstmt2 = conn.prepareStatement(sql2, generatedColumns);
pstmt2.setString(1, name);
pstmt2.setString(2, address);
pstmt2.setInt(3, contact);
pstmt2.executeUpdate();
ResultSet rs = pstmt2.getGeneratedKeys();
custNum = rs.getInt("CUST_NUM");
for(int index=0;index<add.itemNum.length;index++){
String sql = "INSERT INTO ORDERS "+
"VALUES(OrderNumSeq.NEXTVAL, ?, ?)";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1,add.itemNum[index]);
pstmt.setInt(2, add.quantity[index]);
pstmt.executeUpdate();
}
creditCard = Integer.parseInt(creditCardTextField.getText());
String sql3 = "INSERT INTO TRANSACTION " +
"VALUES(TransNumSeq.NEXTVAL, ?, ?, ?, ?, ?)";
pstmt3 = conn.prepareStatement(sql3);
pstmt3.setInt(1, custNum);
pstmt3.setInt(2, payment);
pstmt3.setString(3, payment_desc);
pstmt3.setInt(4, creditCard);
pstmt3.setInt(5, change);
}
catch (SQLException ex) {
}
catch(NumberFormatException a){
JOptionPane.showMessageDialog(this, "Invalid input", "Error!", JOptionPane.ERROR_MESSAGE);
}
}
catch(NumberFormatException a){
JOptionPane.showMessageDialog(this, "Invalid input", "Error!", JOptionPane.ERROR_MESSAGE);
}
finally{
try{
if(pstmt!=null)
pstmt.close();
}
catch(SQLException se2){
}
try{
if(pstmt2!=null)
pstmt2.close();
}
catch(SQLException se2){
}
try{
if(pstmt3!=null)
pstmt3.close();
}
catch(SQLException se2){
}
try{
if(conn!=null)
conn.close();
}
catch(SQLException se){
}
}
}
else
JOptionPane.showMessageDialog(this, "Your payment is not enough. Please try again!", "Error!", JOptionPane.ERROR_MESSAGE);
}
catch(NumberFormatException a){
JOptionPane.showMessageDialog(this, "Invalid input", "Error!", JOptionPane.ERROR_MESSAGE);
}
catch(ClassNotFoundException ex) {
System.out.println("Error: unable to load driver class!");
System.exit(1);
}
错误讯息：
java.sql.SQLException: Unsupported feature
at oracle.jdbc.driver.OracleReturnResultSet.findColumn(OracleReturnResultSet.java:95)
at oracle.jdbc.driver.GeneratedResultSet.getInt(GeneratedResultSet.java:1350)
at FinishTransaction.actionPerformed(FinishTransaction.java:156)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6516)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6281)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4872)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:747)
at java.awt.EventQueue.access$300(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:706)
at java.awt.EventQueue$3.run(EventQueue.java:704)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:720)
at java.awt.EventQueue$4.run(EventQueue.java:718)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:717)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
这是错误消息指向的行：custNum = rs.getInt("CUST_NUM");
答案 0 :(得分：1)
应该做以下事情：
add中的并行数组，而是创建一个包含字段的类的数组。因此
void f(int payment, int total, String name, String address, int contact, int creditCard) throws SQLException {
if (payment >= total) {
int change = payment - total;
JOptionPane.showMessageDialog(null, "Thank you for shopping! Your change is " + change, "Exiting", JOptionPane.INFORMATION_MESSAGE);
String URL = "jdbc:oracle:thin:@VAIO:49160:xe";
String USER = "mariel";
String PASS = "1234";
// No longer needed in JDBC4: Class.forName("oracle.jdbc.driver.OracleDriver");
try (Connection conn = DriverManager.getConnection(URL, USER, PASS)) {
String sql2 = "INSERT INTO CUSTOMER "
+ "VALUES(CustNumSeq.NEXTVAL, ?, ?, ?)";
String generatedColumns[] = {"CUST_NUM"};
try (PreparedStatement pstmt2 = conn.prepareStatement(sql2, generatedColumns)) {
pstmt2.setString(1, name);
pstmt2.setString(2, address);
pstmt2.setInt(3, contact);
pstmt2.executeUpdate();
try (ResultSet rs = pstmt2.getGeneratedKeys()) {
if (rs.next()) {
int custNum = rs.getInt("CUST_NUM");
String sql = "INSERT INTO ORDERS "
+ "VALUES(OrderNumSeq.NEXTVAL, ?, ?)";
try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
for (int index = 0; index < add.itemNum.length; index++) {
pstmt.setInt(1, add.itemNum[index]);
pstmt.setInt(2, add.quantity[index]);
pstmt.executeUpdate();
}
}
}
String sql3 = "INSERT INTO TRANSACTION "
+ "VALUES(TransNumSeq.NEXTVAL, ?, ?, ?, ?, ?)";
try (PreparedStatement pstmt3 = conn.prepareStatement(sql3)) {
pstmt3.setInt(1, custNum);
pstmt3.setInt(2, payment);
pstmt3.setString(3, payment_desc);
pstmt3.setInt(4, creditCard);
pstmt3.setInt(5, change);
pstmt3.executeUpdate();
}
}
}
}
}