使用limit分页查询无效（显示所有结果）

package addCourse.servlet;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import addCourse.model.course;

import addCourseDaoImpl.courseDaoImpl;

@WebServlet("/addCourseServlet")

public class addCourseServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

    public addCourseServlet() {

        super();

    }

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

course c = new course();

String courseName = request.getParameter("courseName");

String category =request.getParameter("category");

String desp =request.getParameter("desp");

if(courseName.isEmpty()||category.isEmpty()||desp.isEmpty()) {

request.getRequestDispatcher("/addCourse.jsp").forward(request, response);

}else {

c.setName(courseName);

c.setCategory(category);

c.setDesp(desp);

courseDaoImpl add= new courseDaoImpl();

boolean flag = add.addCourse(c);

if(flag) {

request.getSession().setAttribute("add", "1");

}

System.out.println(flag+"///");

List<course> list = add.FindAllCourse(0,5);

request.getSession().setAttribute("list",list);

request.getRequestDispatcher("/showCourse.jsp").forward(request, response);

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

---------------------------------------------------

package addCourseDaoImpl;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.util.ArrayList;

import java.util.List;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import addCourse.model.course;

import addCourseDao.addCourseDao;

import addCourseJDBCUtils.jdbcUtils;

public class courseDaoImpl implements addCourseDao {

@Override

public boolean addCourse(course c) {

Connection conn = null;

PreparedStatement pstmt = null;

boolean flag = false;

try {

conn = jdbcUtils.getConn();

String sql = "insert course values(null,?,?,?,now())";

pstmt = conn.prepareStatement(sql);

pstmt.setString(1, c.getName());

pstmt.setString(2, c.getCategory());

pstmt.setString(3,c.getDesp());

int x = pstmt.executeUpdate();

if(x>0) {

flag = true;

}

}catch(Exception e) {

e.printStackTrace();

}finally {

jdbcUtils.release(conn, pstmt);

}

return flag;

}

@Override

public List<course> FindAllCourse(int index,int column) {

Connection conn = null;

PreparedStatement pstmt = null;

List<course> list = new ArrayList();

ResultSet rs = null;

try {

conn = jdbcUtils.getConn();

String sql = "select * from course limit ?,?";

pstmt = conn.prepareStatement(sql);

pstmt.setInt(1, index);

pstmt.setInt(2, column);

rs = pstmt.executeQuery();

while(rs.next()) {

course c = new course();

c.setId(rs.getInt("id"));

c.setName(rs.getString("name"));

c.setCategory(rs.getString("category"));

c.setDesp(rs.getString("desp"));

c.setCreateTime(rs.getDate("createTime"));

list.add(c);

}

}catch(Exception e) {

e.printStackTrace();

}finally {

jdbcUtils.release(conn, pstmt,rs);

}

return list;

}

}