所以我正在处理的数据库出现了这个问题，我在使用java连接Mysql和Neatbean的程序中引入信息时出错。。。。问题是当我在的时候
在我的程序中介绍信息
如果你需要我的数据库和代码的信息，我会把它留在这里
create database colorines;
use colorines;
create table informacion(
articulo varchar(50),
departamento varchar(50),
precio float,
cantidad int
)ENGINE=INNODB;
MYSQL 上的数据库
package jproject;
/**
*
* @author KK
*/
public class JProject {
public static void main(String[] args) {
}
}
//这是一个名为jproject.java的包，网站将其放在同一个盒子中的代码中，但这与下一个代码是分开的
package jproject;
import java.sql.*;
import javax.swing.DefaultListModel;
import javax.swing.JOptionPane;
/* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author KK
*/
public class JProject2 extends javax.swing.JFrame {
static Connection conn= null;/*metodos de tipo SQL para usar en la BD*/
static Statement st=null;
static ResultSet rs=null;
DefaultListModel mod1= new DefaultListModel();
DefaultListModel mod2= new DefaultListModel();
DefaultListModel mod3= new DefaultListModel();
DefaultListModel mod4= new DefaultListModel();
/*datos de la BD para la conexion*/
static String bd="colorines";
static String login="root";
static String pass="";
static String url="jdbc:mysql://localhost/"+bd;
/*Metodo para hacer la conexion a la bd*/
public static Connection Enlace(Connection conn)throws SQLException
{
try
{
Class.forName("com.mysql.jdbc.Driver");
conn= DriverManager.getConnection(url,login,pass);
}
catch(ClassNotFoundException c)
{
JOptionPane.showMessageDialog (null,c);
}
return conn;
}
/**
* Creates new form Conecta
*/
public JProject2() {
initComponents();
jTextField1.setText("");
jTextField2.setText("");
jTextField3.setText("");
jTextField4.setText("");
jTextField5.setText("");
jTextField6.setText("");
jList1.setModel(mod1);
jList2.setModel(mod2);
jList3.setModel(mod3);
jList4.setModel(mod4);
String cadena="";
try
{
conn=Enlace(conn); /*creo la conexion con la base de datos*/
st=conn.createStatement(); /*Especifico que hare una consulta sobre conn que contiene mi base de datos*/
rs=st.executeQuery("select * from informacion"); /*guardo en rs result set, mi consulta de toda la tabla "informacion"*/
while(rs.next()) /*mientras rs result set (contiene la tabla informacion), tenga datos para leer, sigue leyendo*/
{
/*cadena=cadena+rs.getString(1)+" - "+rs.getString(2)+" - "+rs.getString(3)+" - "+rs.getString(4)+"n"; */
mod1.addElement(rs.getString(1));
mod2.addElement(rs.getString(2));
mod3.addElement(rs.getString(3));
mod4.addElement(rs.getString(4));
}
}
catch (SQLException c)
{
JOptionPane.showMessageDialog(null,"Error"+c.getMessage());
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jTextField3 = new javax.swing.JTextField();
jTextField4 = new javax.swing.JTextField();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
jList1 = new javax.swing.JList();
jScrollPane2 = new javax.swing.JScrollPane();
jList2 = new javax.swing.JList();
jScrollPane3 = new javax.swing.JScrollPane();
jList3 = new javax.swing.JList();
jScrollPane4 = new javax.swing.JScrollPane();
jList4 = new javax.swing.JList();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jTextField5 = new javax.swing.JTextField();
jTextField6 = new javax.swing.JTextField();
jScrollPane5 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText(" COLORINES ");
jButton1.setText("GUARDAR");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jLabel2.setText("ARTICULO");
jLabel3.setText("MARCA");
jLabel4.setText("PRECIO");
jLabel5.setText("CANTIDAD");
jTextField1.setText("jTextField1");
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jTextField2.setText("jTextField2");
jTextField3.setText("jTextField3");
jTextField4.setText("jTextField4");
jLabel6.setText("CANTIDAD");
jLabel7.setText("PRECIO");
jLabel8.setText("MARCA");
jLabel9.setText("ARTICULO");
jList1.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jScrollPane1.setViewportView(jList1);
jList2.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jScrollPane2.setViewportView(jList2);
jList3.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jScrollPane3.setViewportView(jList3);
jList4.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jScrollPane4.setViewportView(jList4);
jButton2.setText("BUSCAR");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText("BORRAR");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jTextField5.setText("jTextField5");
jTextField6.setText("jTextField6");
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane5.setViewportView(jTextArea1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 140, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(281, 281, 281))
.addGroup(layout.createSequentialGroup()
.addGap(88, 88, 88)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, 97, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGap(116, 116, 116)
.addComponent(jButton2)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, 116, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton3)
.addGap(144, 144, 144))
.addGroup(layout.createSequentialGroup()
.addGap(67, 67, 67)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jScrollPane5, javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 45, Short.MAX_VALUE)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(52, 52, 52)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jLabel4)
.addGap(19, 19, 19))
.addComponent(jTextField3, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(45, 45, 45)
.addComponent(jLabel5))
.addGroup(layout.createSequentialGroup()
.addGap(28, 28, 28)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, 89, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(30, 30, 30)
.addComponent(jButton1)))))
.addGap(34, 34, 34))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel9)
.addComponent(jScrollPane1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel8)
.addComponent(jLabel3))
.addGap(43, 43, 43)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel7))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(43, 43, 43)
.addComponent(jLabel6))
.addGroup(layout.createSequentialGroup()
.addGap(34, 34, 34)
.addComponent(jScrollPane4, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(87, 87, 87))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton2)
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton3)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel8)
.addComponent(jLabel7)
.addComponent(jLabel6))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jScrollPane4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3)
.addComponent(jLabel4)
.addComponent(jLabel5))
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane5, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(35, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
try
{
conn=Enlace(conn); /*creo la conexion con la base de datos*/
st=conn.createStatement(); /*Especifico que hare una consulta sobre conn que contiene mi base de datos*/
st.execute("DELETE FROM informacion WHERE articulo='"+jTextField6.getText()+"'"); /*guardo en rs result set, mi consulta de toda la tabla "informacion"*/
jTextField6.setText("");
}
catch (SQLException c)
{
JOptionPane.showMessageDialog(null,"Error"+c.getMessage());
}
// TODO add your handling code here:
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
String cadena="";
try
{
conn=Enlace(conn); /*creo la conexion con la base de datos*/
st=conn.createStatement(); /*Especifico que hare una consulta sobre conn que contiene mi base de datos*/
rs=st.executeQuery("select informacion.articulo,informacion.departamento,informacion.precio,informacion.cantidad FROM informacion WHERE articulo='"+jTextField5.getText()+"';"); /*guardo en rs result set, mi consulta de toda la tabla "informacion"*/
while(rs.next()) /*mientras rs result set (contiene la tabla lista), tenga datos para leer, sigue leyendo*/
{
cadena=cadena+rs.getString(1)+" "+rs.getString(2)+" "+rs.getString(3)+" "+rs.getString(4)+"n";
/*mod1.addElement(rs.getString(1));
mod2.addElement(rs.getString(2));
mod3.addElement(rs.getString(3));
mod4.addElement(rs.getString(4));
*/
}
jTextArea1.setText(cadena);
}
catch (SQLException c)
{
JOptionPane.showMessageDialog(null,"Error"+c.getMessage());
}
// TODO add your handling code here:
}
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try
{
conn=Enlace(conn); /*creo la conexion con la base de datos*/
st=conn.createStatement(); /*Especifico que hare una consulta sobre conn que contiene mi base de datos*/
st.execute("INSERT INTO informacion VALUES ("+jTextField1.getText()+",'"+jTextField2.getText()+"','"+jTextField3.getText()+"','"+jTextField4.getText()+"');"); /*guardo en rs result set, mi consulta de toda la tabla "informacion"*/
jTextField1.setText("");
jTextField2.setText("");
jTextField3.setText("");
jTextField4.setText("");
}
catch (SQLException c)
{
JOptionPane.showMessageDialog(null,"Error"+c.getMessage());
}
// 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(JProject2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(JProject2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(JProject2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(JProject2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new JProject2().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JList jList1;
private javax.swing.JList jList2;
private javax.swing.JList jList3;
private javax.swing.JList jList4;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JScrollPane jScrollPane4;
private javax.swing.JScrollPane jScrollPane5;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
private javax.swing.JTextField jTextField3;
private javax.swing.JTextField jTextField4;
private javax.swing.JTextField jTextField5;
private javax.swing.JTextField jTextField6;
// This is JProject2.java
}
这是JProject2.java，通过netbeans向Mysql表发送信息的接口代码，以及这两个之间的java连接器
问题是我们可能需要在列值周围使用单引号因为我们传递的是一个字符串，所以INSERT语句的正确函数代码是：
"INSERT INTO informacion VALUES ('"+jTextField1.getText()+"', '"+jTextField2.getText()+"', "+jTextField3.getText()+", "+jTextField4.getText()+");"
您当前在jButton1ActionPerformed方法中拥有的是
"INSERT INTO informacion VALUES ("+jTextField1.getText()+",'"+jTextField2.getText()+"','"+jTextField3.getText()+"','"+jTextField4.getText()+"');"
哪个dpe看起来不对。
或者，您可以使用PreparedStatementPreparedStatement是一种特殊类型的Statement对象，具有一些有用的功能。
PreparedStatement 的优点
- 易于在SQL语句中插入参数
- 使用新参数可以轻松重用PreparedStatement
您可以使用PreparedStatement而不是以下语句：
String insertTableSQL = "INSERT INTO informacion"
+ "(articulo , departamento , precio , cantidad ) VALUES"
+ "(?,?,?,?)";
PreparedStatement preparedStatement = conn.prepareStatement(insertTableSQL);
preparedStatement.setString(1, "jTextField1.getText()");
preparedStatement.setString(2, "jTextField2.getText()");
preparedStatement.setFloat(3, Float.parseFloat("jTextField3.getText()"));
preparedStatement.setInt(4, Integer.parseInt("jTextField4.getText()"));
// execute insert SQL stetement
preparedStatement .executeUpdate();