Question

我有mysql DB，其中costumer表包括两条记录：id 1 name omar，id 3 name ahmad。我用这个类来获取和设置ID和名称

public class ComboItem 
{
private int index;
private String name;

public ComboItem(int pindex, String pName)
{
    this.index = pindex;
    this.name = pName;
}

public int GetIndex()
{
    return this.index;
}

public String GetName()
{
    return this.name;
}

public void SetIndex(int pindex)
{
    this.index = pindex;
}

 public void SetName(String pName)
{
    this.name = pName;
}

主要课程

private void FillNameComboBox(JComboBox combo) throws IOException{
    try{
        combo.removeAllItems();
        Connect c =new Connect();
        Statement stmnt= c.MakeConnection().createStatement();
        ResultSet rset=stmnt.executeQuery("select idCostumer,Name from Costumer");
        while(rset.next()){
            int index=Integer.parseInt(rset.getString("idCostumer"));
            String name=rset.getString("Name");
            ComboItem ci=new ComboItem(index, name);
            combo.addItem(ci);
        }

    }
    catch(SQLException e){
        JOptionPane.showMessageDialog(NameComboBox, e);
    }
}

每当我运行应用程序时，它一直给我的索引而不是ID ...我该怎么做？screen shot

Answer 1

亲爱的奥马尔您可以通过执行以下操作为Jcompobox提供ID和名称

1-首先创建一个Compo框类，让它命名为＆＃34; ComboItem＆＃34;并执行以下操作：

公共类ComboItem {

private int index;
private String name;
private String col;

public ComboItem(int pindex, String pName) {
    this.index = pindex;
    this.name = pName;
}

public ComboItem(int pindex, String pcol, String pName) {
    this.index = pindex;
    this.col = pcol;
    this.name = pName;

}

public int GetIndex() {
    return this.index;
}

public String GetName() {
    return this.name;
}

public String GetCol() {
    return this.col;
}

public int SetIndex(int pindex) {
    this.index = pindex;
    return pindex;
}

public String SetName(String pName) {
    this.name = pName;
    return pName;
}

public String SetCol(String pCol) {
    this.col = pCol;
    return pCol;
}

// This will be used internally by JComboBox as the label to be displayed.
@Override
public String toString() {
    return name;
}

// to get the Index of Combobox depends on ComboItem Class
public static int getIndexById(JComboBox combo, int id) {

    for (int i = 1; i < combo.getItemCount(); i++) {
        try {
            ComboItem c = (ComboItem) combo.getItemAt(i);
            int tempId = c.GetIndex();
            if (tempId == id) {
                return i;
            }
        } catch (Exception e) {

        }
    }
    return 0;
}

}

之后，您将能够在其他类中设置和获取compo box Items，如下所示：

设置项目ID和名称

     try
    {
        combo.removeAllItems();
        conn = Operations.SqlConnector();
        String sql = "select EmpID, EmpName from Emp";
        pst = conn.prepareStatement(sql);
        rs = pst.executeQuery();
        ComboItem nullValue = new ComboItem(0,"- select -");
        combo.addItem(nullValue);
        while(rs.next())
        {
            int index = Integer.parseInt(rs.getString("EmpID"));
            String name = rs.getString("EmpName");
            ComboItem c = new ComboItem(index,name);
            combo.addItem(c);
            c.GetName();
        }
        pst.close();
        rs.close();
    }
    catch(SQLException | NumberFormatException e)
    {
        JOptionPane.showMessageDialog(null, e);
    }

获取物品ID或名称

ComboItem dept = (ComboItem) ComboBox_DeptID.getSelectedItem();
int deptID = dept.GetIndex();

您还可以使用GetIndexByID（），如下所示：

int dept = ComboItem.getIndexById(ComboBox_DeptID, BindList().get(index).GetDeptID());
        ComboBox_DeptID.setSelectedIndex(dept);

最好的问候。

将ID添加到Value而不是mysql中的自动数字Jcombobox

1 个答案: