java - 如何通过id从表中删除一条记录

Question

我从数据库中检索了所有数据并用表格显示列表。现在我想在单击表中的“删除”时删除一条记录。我不知道如何传递我要删除的记录的 id。您能检查我的代码并给出指示吗？我非常感谢您的指示。

JSP:

    <table id="employee" class="table">
                    <thead>
                        <tr>
                            <th><span>ID</span></th>
                            <th><span>Name</span></th>
                            <th><span>DOB</span></th>
                            <th><span>Address</span></th>
                            <th><span>Position</span></th>
                            <th colspan="2"><span></span></th>
                        </tr>
                    </thead>
                    <tbody>
                        <s:iterator value="emplistList" var="emplist">
                        <tr>
                        <td><s:property value="id"></s:property></td>
                        <td><s:property value="name"></s:property></td>
                        <td><s:property value="dateofbirth"></s:property></td>
                        <td><s:property value="address"></s:property></td>
                        <td><s:property value="position"></s:property></td>
                        <td><span><a href="delemp?name=<s:property value='id'/>">Delete</a></span>
                    </td>
                        </tr>
                        </s:iterator>
                    </tbody>
                </table>

行动:

public String delete() throws Exception{
    int i = EmployeeListDao.delete(this);
    if(i>0){
        return SUCCESS;
    }
    return ERROR;
}

道:

public static int delete(EmployeeListAction emp) {
    // TODO Auto-generated method stub
    int status = 0;
    Connection conn = null;
    try {
        String url = "jdbc:mysql://localhost:3306/Test";
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection(url, "root", "root");
        System.out.println(conn);
        PreparedStatement ps = conn
                .prepareStatement("Delete from employee where emp_id=?");
        ps.setInt(1, emp.getId());
        status = ps.executeUpdate();

    } catch (Exception e) {
        // TODO: handle exception
        System.out.println(e);
    }
    return status;

}

Struts.xml

<action name="delemp" class="master.struts2.action.EmployeeListAction"
        method="delete">
        <result name="input">index.jsp</result>
        <result name="success" type="dispatcher">index.jsp</result>
        <result name="error">error.jsp</result>
    </action>

Answer 1

您可以简单地使用 ServletActionContext.getRequest().getParameter("paramName"); 来获取 action 中的 HttpRequest 参数值类(class)。所以在你的删除方法中，

public String delete() throws Exception{
    String id=ServletActionContext.getRequest().getParameter("name");
    int i = EmployeeListDao.delete(id);
    if(i>0){
        return SUCCESS;
    }
    return ERROR;
} 

将为您完成这项工作。但看看这里类似的线程 How to access url parameters in Action classes Struts 2