找不到symbol executeQuery

Question

我是Netbeans的新手，现在正在尝试实现JDBC连接。我想用我的java文件ShowData.java连接MS Access数据库mis.accdb。ShowData.java的内容

import java.beans.Statement;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ShowData extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out=response.getWriter();
Connection con=null;
Statement st=null;
ResultSet rs=null;
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    try 
    {
        con=DriverManager.getConnection("jdbc:odbc:mis");
    } catch (SQLException ex) 
    {
        Logger.getLogger(ShowData.class.getName()).log(Level.SEVERE, null, ex);
    }
st=(Statement) con.createStatement();
rs=st.executeQuery("select * from student");
out.println("<table border='1'><tr><th>Student ID</th><th>Student Name</th><th>Branch</th></tr>");
while(rs.next())
{
int sid=rs.getInt("StudId");
String snm=rs.getString("StudName");
String br=rs.getString("Branch");
out.println("<tr>");
out.println("<td>"+sid+"</td>");
out.println("<td>"+snm+"</td>");
out.println("<td>"+br+"</td>");
}
}
catch(ClassNotFoundException e)
{
out.println("Driver Loading Failed...");
}
catch(SQLException e)
{
out.println("Please Check SQL Query...");
}
}
}

此代码最初在没有Netbeans IDE的情况下工作，现在当我尝试在集成开发环境中实现它时，它在rs=st.executeQuery("select * from student");行上显示了一个错误，如下所示

cannot find symbol
symbol: method executeQuery(String)
location: variable st of type Statement

请帮我解决这个问题，并指导我如何在Netbeans中连接到上述指定的MS Access数据库mis.accdb。谢谢

Answer 1

导入的java.beans.Statement不正确。你可能指的是java.sql.Statement。

更改之后，您可能还可以删除此行中的强制转换：

st=(Statement) con.createStatement();

Answer 2

这也是我所面临的问题，它帮助我解决了这个问题

我用过

PreparedStatement st = null;

st = con.prepareStatement("THE QUERY");

ResultSet rs=st.executeQuery();

所有这些都在同一个事件/函数中