使用jComboBox从数据库中过滤jTable数据
[英]Filter jTable data from database using jComboBox
问题描述
I am new in java programming. 
我是Java编程的新手。 I used netbeans 8.2 to create simple projects. 我使用netbeans 8.2创建简单的项目。 Now, I created a jtable with data from database and I used jComboBox to filter its data. 现在，我使用数据库中的数据创建了一个jtable ，并使用jComboBox过滤了其数据。
I want the jTable to show data depending on the selected item of jCombobox . 我希望jTable根据jCombobox的选定项显示数据。
jComboBox is also connected to database but to a different table. jComboBox也连接到数据库，但连接到另一个表。
My database 我的资料库
Database - sales 数据库- sales
-
cat: id, categorycat：ID，类别 -
product: id, specs, price, quantityproduct：编号，规格，价格，数量
The jComboBox is connected to table cat and is showing the data from category column. jComboBox连接到表cat ，并显示category列中的数据。
The problem is the jTable does not show data. 问题是jTable不显示数据。
package GUI;
public class MainGUI extends javax.swing.JFrame {
myQuery mq = new myQuery();
public MainGUI() {
initComponents();
BindCombo();
}
private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) { ArrayList <Product> list = mq.getData(jComboBox1.getSelectedItem().toString());
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(new Object \[\]{"id","specs","price","quantity"}); Object\[\] row = new Object\[4\];
for (int i= 0; i < list.size();i++){
row \[0\] = list.get(i).getId();
row \[1\] = list.get(i).getSpecs();
row \[2\] = list.get(i).getId();
row \[3\] = list.get(i).getSpecs();
model.addRow(row);
}
jTable1.setModel(model);
}
/*bind jComboBox to database table cat*/
private void BindCombo(){
Connection con = myQuery.Connect();
Statement st;
ResultSet rs;
try{
st = con.createStatement();
rs = st.executeQuery("SELECT * FROM cat");
while(rs.next()){
jComboBox1.addItem(rs.getString(2));
}
}catch(SQLException ex){
}
}
public class myQuery {
public static Connection Connect(){
Connection conn = null;
try{
Class.forName("com.mysql.jdbc.Driver");
conn = riverManager.getConnection("jdbc:mysql://localhost:3306/sales", "root", "");
System.out.println("Connected");
return conn;
}catch(Exception e){
JOptionPane.showMessageDialog(null, e);
return null;
}
}
/* fetch data from database to jTable*/
public ArrayList<Product> getData(String category){
ArrayList<Product> list = new ArrayList<Product>();
Connection conn = Connect();
Statement st = null;
ResultSet rs = null;
try{
st = conn.createStatement();
rs = st.executeQuery("SELECT 'id', 'specs', 'price', 'quantity' FROM 'product' WHERE 'category'");
Product p = null;
while(rs.next()){
p = new Product(
rs.getInt("id"),
rs.getString("specs"),
rs.getInt("price"),
rs.getInt("quantity")
);
list.add(p);
}
}catch(SQLException ex){
}
return list;
}
}
2 个解决方案
解决方案1
0 2019-02-08 14:25:26
Let me get this straight first. 让我先弄清楚这一点。 You want to display a grid called jTable, and refresh its content whenever a change occurs in jCombobox1, correct? 您想显示一个名为jTable的网格，并在jCombobox1中发生更改时刷新其内容，对吗？ The WHERE clause looks suspect as there is no SARG equation (Search argument). WHERE子句看起来很可疑，因为没有SARG方程（搜索参数）。
rs = st.executeQuery("SELECT 'id', 'specs', 'price', 'quantity' FROM 'product' WHERE 'category'"); You need WHERE 'category' = ???
at the VERY LEAST. 至少 In fact, the way you are iterating over the rows is very inefficient. 实际上，在行上进行迭代的方式效率很低。 Try to think of binding to the full SET every time instead of a "for loop." 尝试考虑每次都绑定到完整的SET，而不是“ for循环”。
解决方案2
0 2019-02-09 00:30:33
@Abra here it is initComponents menthod @Abra这是initComponents方法
private void initComponents() { 私人无效initComponents（）{
BindingAppPUEntityManager = java.beans.Beans.isDesignTime() ? null : javax.persistence.Persistence.createEntityManagerFactory("BindingAppPU").createEntityManager();
productQuery = java.beans.Beans.isDesignTime() ? null : BindingAppPUEntityManager.createQuery("SELECT p FROM Product p");
productList = java.beans.Beans.isDesignTime() ? java.util.Collections.emptyList() : productQuery.getResultList();
jTabbedPane1 = new javax.swing.JTabbedPane();
categotyPanel = new javax.swing.JPanel();
jPanel1 = new javax.swing.JPanel();
jPanel2 = new javax.swing.JPanel();
jTextField1 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
jPanel3 = new javax.swing.JPanel();
jComboBox1 = new javax.swing.JComboBox();
jLabel3 = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
jLabel4 = new javax.swing.JLabel();
productPanel = new javax.swing.JPanel();
jPanel4 = new javax.swing.JPanel();
jLabel5 = new javax.swing.JLabel();
jComboBox2 = new javax.swing.JComboBox();
jLabel6 = new javax.swing.JLabel();
jTextField2 = new javax.swing.JTextField();
jLabel7 = new javax.swing.JLabel();
jTextField3 = new javax.swing.JTextField();
jLabel8 = new javax.swing.JLabel();
jTextField4 = new javax.swing.JTextField();
jLabel9 = new javax.swing.JLabel();
jTextField5 = new javax.swing.JTextField();
jButton2 = new javax.swing.JButton();
jLabel10 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTabbedPane1.setFont(new java.awt.Font("Times New Roman", 0, 18)); // NOI18N
jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());
jPanel2.setBorder(javax.swing.BorderFactory.createEtchedBorder());
jTextField1.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jTextField1.setHorizontalAlignment(javax.swing.JTextField.CENTER);
jLabel1.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jLabel1.setText("Name");
jButton1.setFont(new java.awt.Font("Times New Roman", 1, 12)); // NOI18N
jButton1.setText("add");
jLabel2.setFont(new java.awt.Font("Times New Roman", 0, 18)); // NOI18N
jLabel2.setText("Add New Category");
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(jLabel2)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addGap(95, 95, 95)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jTextField1)
.addGap(95, 95, 95))
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(12, 12, 12)
.addComponent(jButton1)
.addContainerGap())
);
jPanel3.setBorder(javax.swing.BorderFactory.createEtchedBorder());
jComboBox1.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jComboBox1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jComboBox1ActionPerformed(evt);
}
});
jLabel3.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jLabel3.setText("Available Categories");
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
}
));
jScrollPane1.setViewportView(jTable1);
jLabel4.setFont(new java.awt.Font("Times New Roman", 1, 18)); // NOI18N
jLabel4.setText("Available Products");
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addGap(20, 20, 20)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addGap(23, 23, 23))
.addGroup(jPanel3Layout.createSequentialGroup()
.addGap(30, 30, 30)
.addComponent(jLabel3)
.addGap(18, 18, 18)
.addComponent(jComboBox1, 0, 203, Short.MAX_VALUE)
.addGap(91, 91, 91))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel4)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))
.addGap(13, 13, 13)
.addComponent(jLabel4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 325, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(19, Short.MAX_VALUE))
);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 105, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
javax.swing.GroupLayout categotyPanelLayout = new javax.swing.GroupLayout(categotyPanel);
categotyPanel.setLayout(categotyPanelLayout);
categotyPanelLayout.setHorizontalGroup(
categotyPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, categotyPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
categotyPanelLayout.setVerticalGroup(
categotyPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(categotyPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jTabbedPane1.addTab("Category", categotyPanel);
jPanel4.setBorder(javax.swing.BorderFactory.createEtchedBorder());
jLabel5.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
jLabel5.setText("Category");
jComboBox2.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jLabel6.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
jLabel6.setText("Name");
jTextField2.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jTextField2.setHorizontalAlignment(javax.swing.JTextField.CENTER);
jLabel7.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
jLabel7.setText("CostPrice");
jTextField3.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jTextField3.setHorizontalAlignment(javax.swing.JTextField.CENTER);
jLabel8.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
jLabel8.setText("SalePrice");
jTextField4.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jTextField4.setHorizontalAlignment(javax.swing.JTextField.CENTER);
jLabel9.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
jLabel9.setText("Quantity");
jTextField5.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jTextField5.setHorizontalAlignment(javax.swing.JTextField.CENTER);
jButton2.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
jButton2.setText("Add");
jLabel10.setFont(new java.awt.Font("Times New Roman", 1, 18)); // NOI18N
jLabel10.setText("Add new Product");
javax.swing.GroupLayout jPanel4Layout = new javax.swing.GroupLayout(jPanel4);
jPanel4.setLayout(jPanel4Layout);
jPanel4Layout.setHorizontalGroup(
jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel4Layout.createSequentialGroup()
.addGap(139, 139, 139)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel6)
.addComponent(jLabel7)
.addComponent(jLabel8)
.addComponent(jLabel9)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 56, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTextField4, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jTextField2, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jTextField3)
.addComponent(jTextField5)
.addComponent(jComboBox2, 0, 176, Short.MAX_VALUE))
.addGap(85, 85, 85))
.addGroup(jPanel4Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel10))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel4Layout.setVerticalGroup(
jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel4Layout.createSequentialGroup()
.addGap(17, 17, 17)
.addComponent(jLabel10)
.addGap(18, 18, 18)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel5)
.addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(25, 25, 25)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel6)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel7)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel8)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel9)
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(44, 44, 44)
.addComponent(jButton2)
.addContainerGap(225, Short.MAX_VALUE))
);
javax.swing.GroupLayout productPanelLayout = new javax.swing.GroupLayout(productPanel);
productPanel.setLayout(productPanelLayout);
productPanelLayout.setHorizontalGroup(
productPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, productPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
productPanelLayout.setVerticalGroup(
productPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(productPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jTabbedPane1.addTab("Product", productPanel);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTabbedPane1)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTabbedPane1)
);
pack();
}// </editor-fold>
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