我想在保存按钮点击时将jtable多行数据插入到mysql数据库中。它给出了一些错误......
这是我的代码......
package my.bill;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax .swing.table.DefaultTableModel;
public class bill extends javax.swing.JFrame {
/**
* Creates new form bill
*/
Object[][] data=null;
String[] columnNames = new String[2];
/*static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL="jdbc:mysql://localhost:3306/gdb?zeroDateTimeBehavior=convertToNull";
//static final String DB_URL = "jdbc:mysql://localhost/";
// Database credentials
static final String USER = "root";
static final String PASS = "root";*/
public bill() {
initComponents();
CurrentDate();
}
public void CurrentDate(){
Calendar cal=new GregorianCalendar();
int month=cal.get(Calendar.MONTH);
int year=cal.get(Calendar.YEAR);
int day=cal.get(Calendar.DAY_OF_MONTH);
Date.setText(day+"-"+(month+1)+"-"+year);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
Date = new javax.swing.JTextField();
jScrollPane2 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
netprofit = new javax.swing.JButton();
netsum = new javax.swing.JTextField();
save = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Date");
Date.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
DateActionPerformed(evt);
}
});
jTable1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
jTable1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{"", null, null, null, null, null},
{"", null, null, null, "", null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null}
},
new String [] {
"Job No", "Item", "Billed Amount", "Parts cost", "Net Profit", "Percentage"
}
));
jTable1.setColumnSelectionAllowed(true);
jTable1.setGridColor(new java.awt.Color(0, 0, 0));
jTable1.setRowHeight(20);
jTable1.setRowMargin(2);
jTable1.setSelectionBackground(new java.awt.Color(255, 255, 255));
jTable1.addInputMethodListener(new java.awt.event.InputMethodListener() {
public void caretPositionChanged(java.awt.event.InputMethodEvent evt) {
}
public void inputMethodTextChanged(java.awt.event.InputMethodEvent evt) {
jTable1InputMethodTextChanged(evt);
}
});
jScrollPane2.setViewportView(jTable1);
jTable1.getColumnModel().getSelectionModel().setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
if (jTable1.getColumnModel().getColumnCount() > 0) {
jTable1.getColumnModel().getColumn(0).setHeaderValue("Job No");
jTable1.getColumnModel().getColumn(1).setHeaderValue("Item");
jTable1.getColumnModel().getColumn(2).setHeaderValue("Billed Amount");
jTable1.getColumnModel().getColumn(3).setHeaderValue("Parts cost");
jTable1.getColumnModel().getColumn(4).setHeaderValue("Net Profit");
jTable1.getColumnModel().getColumn(5).setHeaderValue("Percentage");
}
netprofit.setText("Total Profit");
netprofit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
netprofitActionPerformed(evt);
}
});
save.setText("Save");
save.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
saveActionPerformed(evt);
}
});
jMenu1.setText("File");
jMenuBar1.add(jMenu1);
jMenu2.setText("Edit");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(114, 114, 114)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(Date, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(350, 350, 350)
.addComponent(netprofit)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(netsum, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(221, 221, 221)
.addComponent(save)))
.addContainerGap(147, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(20, 20, 20)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(Date, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 350, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(netprofit)
.addComponent(netsum, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(1, 1, 1)
.addComponent(save)
.addContainerGap(32, Short.MAX_VALUE))
);
Date.getAccessibleContext().setAccessibleName("date");
save.getAccessibleContext().setAccessibleName("save");
pack();
}// </editor-fold>
private void DateActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void netprofitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void saveActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Connection conn = null;
Statement stmt = null;
int count=jTable1.getRowCount();
int col=jTable1.getColumnCount();
String jobno[] =new String[count]; // name is array and index 4 means no. of row
String item[]=new String[count];
String bill[] =new String[count]; // name is array and index 4 means no. of row
String part[]=new String[count];
String profit[] =new String[count]; // name is array and index 4 means no. of row
String percent[]=new String[count];
for(int i=0;i<=count;i++)
{
for(int j=0;j<=col;j++)
{
no[i]=jTable1.getValueAt(i,j).toString(); // it get value from 0 row and 0 column
it[i]=jTable1.getValueAt(i,j).toString();
amount[i]=jTable1.getValueAt(i,j).toString();
p[i]=jTable1.getValueAt(i,j).toString();
cost[i]=jTable1.getValueAt(i,j).toString();
s[i]=jTable1.getValueAt(i,j).toString();
try{
String sql="INSERT INTO m (no,it,amount,cost,sell,p,date) VALUES('"+no[i]+"','"+it[i]+"','"+amount[i]+"','"+p[i]+"','"+cost[i]+"','"+s[i]+"','"+Date.getText()+"')";
// stmt.execute(sql);
stmt.executeQuery(sql);
//stmt.execute(sql);
/*PreparedStatement ps=conn.prepareStatement(sql);
ps.setString(1, "");
ps.setString(2, "");
ps.setString(3, "");
ps.setString(4, "");
ps.setString(5, "");
ps.setString(6, "");
ps.setString(7,Date.getText());
ps.execute();*/
JOptionPane.showMessageDialog(null,"saved");
}
catch(Exception e){
JOptionPane.showMessageDialog(null,e);
}
}
}
private void jTable1InputMethodTextChanged(java.awt.event.InputMethodEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
Connection conn = null;
Statement stmt = null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//Class.forName("jdbc:mysql://localhost:3306/ganpatidb?zeroDateTimeBehavior=convertToNull");
//STEP 3: Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ganpatidb", "root", "root");
//STEP 4: Execute a query
System.out.println("Creating database...");
stmt = conn.createStatement();
}catch(SQLException se){
//Handle errors for JDBC
// se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
// e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
//se.printStackTrace();
}//end finally try
}//end try
//System.out.println("Goodbye!");
//int r=jTable1.selectedrow;
//jTable1.getValue(3,3);
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new bill().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField Date;
private javax.swing.JLabel jLabel1;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable1;
private javax.swing.JButton netprofit;
private javax.swing.JTextField netsum;
private javax.swing.JButton save;
// End of variables declaration
}
我如何将多行数据插入mysql数据库.... 请帮帮....
答案 0 :(得分：2)
从它看起来，你甚至没有在saveActionPerformed方法下初始化connection和statement，你将它们设置为NULL。
private void saveActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Connection conn = null;
Statement stmt = null;
在你的主要方法中，你确实正在初始化它们。
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//Class.forName("jdbc:mysql://localhost:3306/ganpatidb?zeroDateTimeBehavior=convertToNull");
//STEP 3: Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ganpatidb", "root", "root");
//STEP 4: Execute a query
System.out.println("Creating database...");
stmt = conn.createStatement();
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
//se.printStackTrace();
}//end finally try
}//end try
您需要删除将其设置为NULL的代码，或者之后直接添加相同的代码，并记住您需要将代码放在try和catch块中。
这样的事情：
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//Class.forName("jdbc:mysql://localhost:3306/ganpatidb?zeroDateTimeBehavior=convertToNull");
//STEP 3: Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ganpatidb", "root", "root");
//STEP 4: Execute a query
System.out.println("Creating database...");
stmt = conn.createStatement();
int count=jTable1.getRowCount();
int col=jTable1.getColumnCount();
String jobno[] =new String[count];
// name is array and index 4 means no. of row
String item[]=new String[count];
String bill[] =new String[count];
// name is array and index 4 means no. of row
String part[]=new String[count];
String profit[] =new String[count];
// name is array and index 4 means no. of row
String percent[]=new String[count];
for(int i=0;
i<
=count;
i++) {
for(int j=0;
j<
=col;
j++) {
no[i]=jTable1.getValueAt(i,j).toString();
// it get value from 0 row and 0 columN
it[i]=jTable1.getValueAt(i,j).toString();
amount[i]=jTable1.getValueAt(i,j).toString();
p[i]=jTable1.getValueAt(i,j).toString();
cost[i]=jTable1.getValueAt(i,j).toString();
s[i]=jTable1.getValueAt(i,j).toString();
try{
String sql="INSERT INTO m (no,it,amount,cost,sell,p,date) VALUES('"+no[i]+"','"+it[i]+"','"+amount[i]+"','"+p[i]+"','"+cost[i]+"','"+s[i]+"','"+Date.getText()+"')";
stmt.execute(sql);
JOptionPane.showMessageDialog(null,"saved");
}
catch(Exception e){
JOptionPane.showMessageDialog(null,e);
}
}
catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}
catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}
finally{
//finally block used to close resources
try{
if(stmt!=null) stmt.close();
}
catch(SQLException se2){
}
// nothing we can do
try{
if(conn!=null) conn.close();
}
catch(SQLException se){
//se.printStackTrace();
}
//end finally try
}
//end try