9、图书修改，删除功能

1、添加图书修改，删除的Dao代码

/*** 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());pstmt.setInt(7, book.getId());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();}/*** 产品信息修改* @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());return pstmt.executeUpdate();}----------------------------------------------------------------------------
}

2、在“图书管理-修改”窗体新建图书修改删除组件

在BookManageInterFrm窗体上添加JLabel，JTextField，JComboBox，JTextArea，JButtonJRadioButton组件

重命名组件：

实现bookTable的行点击事件

@Override
public void mousePressed(MouseEvent e) {bookTableMousePressed(e);
}

调用方法：

this.fillBookType("modify");

修改fillBookType方法，为modify时：

/*** 初始化下拉框*/private void fillBookType(String type){Connection con=null;BookType bookType=null;try{con=dbUtil.getCon();ResultSet rs=bookTypeDao.list(con, new BookType());if("search".equals(type)){bookType=new BookType();bookType.setBookTypeName("请选择");bookType.setId(-1);this.s_bookTypeJcb.addItem(bookType);}while(rs.next()){bookType=new BookType();bookType.setBookTypeName(rs.getString("bookTypeName"));bookType.setId(rs.getInt("id"));if("search".equals(type)){this.s_bookTypeJcb.addItem(bookType);}else if("modify".equals(type)){-----------------------------------------------------------------------------------this.bookTypeJcb.addItem(bookType);
------------------------------------------------------------------------------------------}}}catch(Exception e){e.printStackTrace();}finally{try {dbUtil.close(con);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

/*** 表格行点击处理* @param e*/private void bookTableMousePressed(MouseEvent e) {int row=this.bookTable.getSelectedRow();//获取选中的行this.idTxt.setText(bookTable.getValueAt(row, 0)+"");this.bookNameTxt.setText((String)bookTable.getValueAt( row, 1));this.authorTxt.setText((String)bookTable.getValueAt(row, 2));String sex=(String)bookTable.getValueAt(row, 3);if("男".equals(sex)){this.manJrb.setSelected(true);}else if("女".equals(sex)){this.femaleJrb.setSelected(true);}this.priceTxt.setText((Float)bookTable.getValueAt(row, 4)+"");this.bookDescTxt.setText((String)bookTable.getValueAt(row, 5));String bookTypeName=(String)this.bookTable.getValueAt(row, 6);//遍历下拉框int n=this.bookTypeJcb.getItemCount();for(int i=0;i<n;i++){BookType item=(BookType)this.bookTypeJcb.getItemAt(i);if(item.getBookTypeName().equals(bookTypeName)){this.bookTypeJcb.setSelectedIndex(i);}}}

3、实现修改功能：

修改按钮新建事件

public void actionPerformed(ActionEvent e) {bookUpdateActionPerformed(e);
}

封装一个重置表单的方法

/*** 重置表单*/private void resetValue() {this.idTxt.setText("");this.bookNameTxt.setText("");this.authorTxt.setText("");this.priceTxt.setText("");this.manJrb.setSelected(true);this.bookDescTxt.setText("");if(this.bookTypeJcb.getItemCount()>0){this.bookTypeJcb.setSelectedIndex(0);}}

/*** 图书修改事件处理*/
private void bookUpdateActionPerformed(ActionEvent evt) {String id=this.idTxt.getText();if(StringUtil.isEmpty(id)){JOptionPane.showMessageDialog(null, "请选择图书！");return;}String bookName=this.bookNameTxt.getText();String author=this.authorTxt.getText();String price=this.priceTxt.getText();String bookDesc=this.bookDescTxt.getText();if(StringUtil.isEmpty(bookName)){JOptionPane.showMessageDialog(null, "图书名为空！");return;}if(StringUtil.isEmpty(author)){JOptionPane.showMessageDialog(null, "作者为空！");return;}if(StringUtil.isEmpty(price)){JOptionPane.showMessageDialog(null, "价格为空！");return;}String sex="";if(manJrb.isSelected()){sex="男";}else if(femaleJrb.isSelected()){sex="女";}//获取下拉框BookType bookType=(BookType)bookTypeJcb.getSelectedItem();int bookTypeId=bookType.getId();Book book=new Book(Integer.parseInt(id),bookName,author,sex,Float.parseFloat(price),bookTypeId,bookDesc);Connection con=null;try{con=dbUtil.getCon();int addNum=bookDao.update(con, book);if(addNum==1){JOptionPane.showMessageDialog(null, "修改成功！");resetValue();this.fillTable(new Book());//刷新表单}else{JOptionPane.showMessageDialog(null, "修改失败！");}}catch(Exception e){e.printStackTrace();JOptionPane.showMessageDialog(null, "修改失败！");}finally{try {dbUtil.close(con);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}

4、实现删除功能

删除按钮新建事件

public void actionPerformed(ActionEvent e) {bookDeleteActionPerformed(e);}

/*** 图书删除事件处理* @param e*/private void bookDeleteActionPerformed(ActionEvent evt) {String id=this.idTxt.getText();if(StringUtil.isEmpty(id)){JOptionPane.showMessageDialog(null, "请选择图书！");return;}int n=JOptionPane.showConfirmDialog(null, "确认删除");if(n==0){Connection con=null;try{con=dbUtil.getCon();int deleteNum=bookDao.delete(con, id);if(deleteNum==1){JOptionPane.showMessageDialog(null, "删除成功！");resetValue();this.fillTable(new Book());}else{JOptionPane.showMessageDialog(null, "删除失败！");}}catch(Exception e){e.printStackTrace();JOptionPane.showMessageDialog(null, "删除失败！");}finally{try {dbUtil.close(con);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

5、删除图书类别时做判断，图书类别下是否存在图书

/*** 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();}/*** 产品信息修改* @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();}
-----------------------------------------------------------------------------
}

在BookTypeManageInterFrm 图书类别删除事件处理里加判断

/*** 图书类别删除事件处理* @param e*/private void bookTypeDeleteActionEvent(ActionEvent evt) {String id=idTxt.getText();if(StringUtil.isEmpty(id)){JOptionPane.showMessageDialog(null, "请选择要删除的记录");return;}int n=JOptionPane.showConfirmDialog(null, "是否删除该记录");if(n==0){Connection con=null;try{con=dbUtil.getCon();
----------------------------------------------------------------------------------------boolean flag=bookDao.existBookByBookTypeId(con, id);if(flag){JOptionPane.showMessageDialog(null, "当前图书类存在图书，不可删除");return;}
---------------------------------------------------------------------------------------int deleteNum=bookTypeDao.delete(con, id);if(deleteNum==1){JOptionPane.showMessageDialog(null, "删除成功");this.resetValue();this.fillTable(new BookType());}else{JOptionPane.showMessageDialog(null, "删除失败");}}catch(Exception e){e.printStackTrace();}finally{try {dbUtil.close(con);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

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