用mysql數據填充組合框

Question

嗨，大家好，我有這段代碼，但不知道爲什麼它不起作用！

//in database class 

String query = "SELECT group_name FROM customer ORDER BY group_name"; 
java.sql.PreparedStatement stm = connection.prepareStatement(query); 

rs = stm.executeQuery(query); 

while (rs.next()) { 
String x = rs.getString("group_name"); 
System.out.println(x); 
} 

rs.close(); 
} 


//combo box action 


int group = jcombobox.getSelectedIndex(); 

rg_domain rg = new rg_domain(); 
rg.setGroup(group); 
rg.setPhone_number(phone_no); 

dbconnection db = new dbconnection(); 

db.broadcastmsgservice_sms(rg); 
} 


//domain class 
private String group; 
public void setGroup(String group) { 
this.group = group; 
} 
public String getGroup() { 
return group; 
} 

任何人都可以幫我請..

Answer 1

你的問題不是很清楚，但這裏是你如何填充從數據庫中檢索結果的組合框：

// Create an array list to be filled with group names 
ArrayList<String> groupNames = new ArrayList<String>(); 
String query = "SELECT group_name FROM customer ORDER BY group_name"; 
PreparedStatement stm = connection.prepareStatement(query); 

ResultSet rs = stm.executeQuery(query); 

while (rs.next()) { 
    String groupName = rs.getString("group_name"); 
    // add group names to the array list 
    groupNames.add(groupName) 
} 

rs.close(); 


// Populate the combo box 
DefaultComboBoxModel model = new DefaultComboBoxModel(groupNames.toArray()); 
comboBox.setModel(model);