mysql+java课程设计学生管理系统

package com.java.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import com.java.model.Book; import com.java.util.StringUtil; /** * 图书Dao类 * @author Administrator * */ public class BookDao { /** * 图书添加 * @param con * @param book * @return * @throws Exception */ public int add(Connection con,Book book)throws Exception{ String sql="insert into t_book values(null,?,?,?,?,?,?)"; PreparedStatement pstmt=con.prepareStatement(sql); pstmt.setString(1, book.getBookName()); pstmt.setString(2, book.getAuthor()); pstmt.setString(3, book.getSex()); pstmt.setFloat(4, book.getPrice()); pstmt.setInt(5, book.getBookTypeId()); pstmt.setString(6, book.getBookDesc()); return pstmt.executeUpdate(); } /** * 图书信息查询 * @param con * @param book * @return * @throws Exception */ public ResultSet list(Connection con,Book book)throws Exception{ StringBuffer sb=new StringBuffer("select * from t_book b,t_bookType bt where b.bookTypeId=bt.id"); if(StringUtil.isNotEmpty(book.getBookName())){ sb.append(" and b.bookName like '%"+book.getBookName()+"%'"); } if(StringUtil.isNotEmpty(book.getAuthor())){ sb.append(" and b.author like '%"+book.getAuthor()+"%'"); } if(book.getBookTypeId()!=null && book.getBookTypeId()!=-1){ sb.append(" and b.bookTypeId="+book.getBookTypeId()); } PreparedStatement pstmt=con.prepareStatement(sb.toString()); return pstmt.executeQuery(); } /** * 图书信息删除 * @param con * @param id * @return * @throws Exception */ public int delete(Connection con,String id)throws Exception{ String sql="delete from t_book where id=?"; PreparedStatement pstmt=con.prepareStatement(sql); pstmt.setString(1, id); return pstmt.executeUpdate(); } /** * 图书信息修改 * @param con * @param book * @return * @throws Exception */ public int update(Connection con,Book book)throws Exception{ String sql="update t_book set bookName=?,author=?,sex=?,price=?,bookDesc=?,bookTypeId=? where id=?"; PreparedStatement pstmt=con.prepareStatement(sql); pstmt.setString(1, book.getBookName()); pstmt.setString(2, book.getAuthor()); pstmt.setString(3, book.getSex()); pstmt.setFloat(4, book.getPrice()); pstmt.setString(5, book.getBookDesc()); pstmt.setInt(6, book.getBookTypeId()); pstmt.setInt(7, book.getId()); return pstmt.executeUpdate(); } /** * 指定图书类别下是否存在图书 * @param con * @param bookTypeId * @return * @throws Exception */ public boolean existBookByBookTypeId(Connection con,String bookTypeId)throws Exception{ String sql="select * from t_book where bookTypeId=?"; PreparedStatement pstmt=con.prepareStatement(sql); pstmt.setString(1, bookTypeId); ResultSet rs=pstmt.executeQuery(); return rs.next(); } } 部分代码