javaswing-conditionsql查询

我有一个sqlselect语句，通过jButton从jComboBox&jDateChooser获取用户输入信息来显示jtable上的查询

是否可以为按钮设置条件，例如

下面是jButton action lisener的代码

    java.util.Date dateFromDateChooser = jDateChooser.getDate();
    String dateString = String.format("%1$tY-%1$tm-%1$td", dateFromDateChooser);  

    String attendant = (String) cbName.getSelectedItem();
    String fill = "SELECT id as 'No', recDate as 'Date', super as 'Supervisor', attendant as 'Attendant' from log"
            + "WHERE recDate = '"+dateString+"'"
            + "and attendant = '" + attendant + "'";

    try{

        ps = conn.prepareStatement(fill);
        rs = ps.executeQuery();    
        jTable1.setModel(DbUtils.resultSetToTableModel(rs));

    }
    catch(Exception e){
        JOptionPane.showMessageDialog(null, e);
    }

} 上面的代码运行良好，但我希望允许用户选择两种条件之一。 例如，通过选择“Date and jComboBox”或仅选择“Date”来显示搜索结果

我可以为这种情况使用if-else语句吗

请建议

---

在SQL构建中添加检查

String fill = "SELECT id as 'No', recDate as 'Date', super as 'Supervisor', attendant as 'Attendant' from log"
        + "WHERE recDate = '"+dateString+"'";

if(comboboxShouldBeIncluded) {
        fill+= " and attendant = '" + attendant + "'";
}

---

如果未选择名称，则查询不带助理

String attendant = (String) cbName.getSelectedItem();
    String qry;
    if( attendant != null && !attendant.isEmpty() ) {
     qry = "SELECT id as 'No', recDate as 'Date', super as 'Supervisor', attendant as 'Attendant' from log"
            + "WHERE recDate = '"+dateString+"'"
            + "and attendant = '" + attendant + "'";
    } else {
        qry = "SELECT id as 'No', recDate as 'Date', super as 'Supervisor', attendant as 'Attendant' from log"
            + "WHERE recDate = '"+dateString+"'";
    }

---

是的，这是可能的。如果您澄清您的问题，我们实际上可能会帮助您。请举例说明如何检查（comboboxShouldBeIncluded）{fill+=”和attendant='“+attendant+'”；}