简单的更改记录的语句?解决方案

/* *网站JAVABEAN *添加一条新信息, *添加成功显示提示及继续添加的链接. *前台页面 */package mybean;import java.sql.*;public class Publish {        private PreparedStatement pstmt = null;    private Statement stmt = null;         private Connection conn = null;    private String city;    private String title;    private String style;    private String content;    private String pass;    private String chec;    private String addMessage;            public Publish(){}        public void setCity(String city){        this.city=city;    }    public void setTitle(String title){        this.title=title;           }    public void setStyle(String style){        this.style=style;    }    public void setContent(String content){        //替换HTML字符输出的格式        content=content.replace("\n","<BR/>");        content=content.replace(" ","&nbsp;");        this.content=content;    }    public void setPass(String pass){        this.pass=pass;    }    public void setChec(String chec){        this.chec=chec;    }        public String getCity(){        return this.city;    }    public String getTitle(){        return this.title;    }    public String getStyle(){        return this.style;    }    public String getContent(){        return this.content;    }    public String getPass(){        return this.pass;    }    public String getChec(){        return this.chec;    }    public String getAddMessage(){        conn = DBConnSource.getConnection("jdbc/myweb");                   try{         String sql="INSERT INTO adver VALUES(?,?,?,?,?,?,?,?)";           pstmt = DBConnSource.getPstmt(conn,sql);        java.util.Date date=new java.util.Date();        Timestamp tt=new Timestamp(date.getTime());        pstmt.setInt(1,0);        pstmt.setString(2,city);        pstmt.setString(3,style);        pstmt.setString(4,title);        pstmt.setString(5,content);        pstmt.setTimestamp(6,tt);        pstmt.setString(7,pass);        pstmt.setString(8,chec);                int flag=pstmt.executeUpdate();        if(flag>0){            addMessage="成功添加"+flag+"条记录!";            String sql2="UPDATE stylelist SET cou=cou+1 WHERE style='"+style+"'";                       stmt.executeUpdate(sql2); //这一句是Publish.java:89            }else{                addMessage="添加记录失败";            }      }catch(SQLException e) {        e.printStackTrace();    }finally{        DBConnSource.close(stmt);        DBConnSource.close(pstmt);        DBConnSource.close(conn);    }                        return addMessage;    }}