attachment.java

云网论坛CWBBS 源码,内容丰富,学习,参考,教学的好资料,具体见内说明,

package cn.js.fan.module.cms;

import java.io.File;
import java.sql.*;

import cn.js.fan.db.Conn;
import cn.js.fan.web.Global;
import org.apache.log4j.Logger;
import cn.js.fan.util.StrUtil;

public class Attachment implements java.io.Serializable {
    int id;
    int docId;
    String name;
    String fullPath;
    String diskName;
    String visualPath;

    String connname;

    String LOAD = "SELECT doc_id, name, fullpath, diskname, visualpath, orders, page_num,downloadCount FROM document_attach WHERE id=?";
    String SAVE = "update document_attach set doc_id=?, name=?, fullpath=?, diskname=?, visualpath=?, orders=?, page_num=?,downloadCount=? WHERE id=?";
    Logger logger = Logger.getLogger(Attachment.class.getName());

    public Attachment(int id) {
        connname = Global.defaultDB;
        if (connname.equals(""))
            logger.info("Attachment:DB is empty！");
        this.id = id;
        loadFromDb();
    }

    public Attachment(int orders, int docId, int pageNum) {
        connname = Global.defaultDB;
        if (connname.equals(""))
            logger.info("Attachment:DB is empty！");
        this.orders = orders;
        this.docId = docId;
        this.pageNum = pageNum;
        loadFromDbByOrders();
    }

    public boolean del() {
        String sql = "delete from document_attach where id=?";
        Conn conn = new Conn(connname);
        boolean re = false;
        try {
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, id);
            re = conn.executePreUpdate()==1?true:false;
            pstmt.close();
            // 更新其后的附件的orders
            sql = "update document_attach set orders=orders-1 where doc_id=? and page_num=? and orders>?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, docId);
            pstmt.setInt(2, pageNum);
            pstmt.setInt(3, orders);
            conn.executePreUpdate();
        }
        catch (SQLException e) {
            logger.error("del:" + e.getMessage());
            return false;
        }
        finally {
            if (conn!=null) {
                conn.close(); conn = null;
            }
        }
        // 删除文件
        File fl = new File(this.fullPath);
        fl.delete();
        return re;
    }

    public boolean save() {
        Conn conn = new Conn(connname);
        boolean re = false;
        try {
            PreparedStatement pstmt = conn.prepareStatement(SAVE);
            pstmt.setInt(1, docId);
            pstmt.setString(2, name);
            pstmt.setString(3, fullPath);
            pstmt.setString(4, diskName);
            pstmt.setString(5, visualPath);
            pstmt.setInt(6, orders);
            pstmt.setInt(7, pageNum);
            pstmt.setInt(8, downloadCount);
            pstmt.setInt(9, id);
            re = conn.executePreUpdate()==1?true:false;
        }
        catch (SQLException e) {
            logger.error("save:" + e.getMessage());
        }
        finally {
            if (conn!=null) {
                conn.close(); conn = null;
            }
            DocCacheMgr dcm = new DocCacheMgr();
            dcm.refreshUpdate(docId);
        }
        return re;
    }

    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getDocId() {
        return this.docId;
    }

    public void setDocId(int di) {
        this.docId = di;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDiskName() {
        return this.diskName;
    }

    public void setDiskName(String dn) {
        this.diskName = dn;
    }

    public String getFullPath() {
        return this.fullPath;
    }

    public void setFullPath(String f) {
        this.fullPath = f;
    }

    public String getVisualPath() {
        return this.visualPath;
    }

    public int getOrders() {
        return orders;
    }

    public int getPageNum() {
        return pageNum;
    }

    public boolean isLoaded() {
        return loaded;
    }

    public int getDownloadCount() {
        return downloadCount;
    }

    public void setVisualPath(String vp) {
        this.visualPath = vp;
    }

    public void setOrders(int orders) {
        this.orders = orders;
    }

    public void setPageNum(int pageNum) {
        this.pageNum = pageNum;
    }

    public void setLoaded(boolean loaded) {
        this.loaded = loaded;
    }

    public void setDownloadCount(int downloadCount) {
        this.downloadCount = downloadCount;
    }

    public void loadFromDb() {
        Conn conn = new Conn(connname);
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        try {
            pstmt = conn.prepareStatement(LOAD);
            pstmt.setInt(1, id);
            rs = conn.executePreQuery();
            if (rs != null && rs.next()) {
                docId = rs.getInt(1);
                name = rs.getString(2);
                fullPath = rs.getString(3);
                diskName = rs.getString(4);
                visualPath = rs.getString(5);
                orders = rs.getInt(6);
                pageNum = rs.getInt(7);
                downloadCount = rs.getInt(8);
                loaded = true;
            }
        } catch (SQLException e) {
            logger.error(e.getMessage());
        } finally {
            if (rs != null) {
                try {
                    rs.close();
                } catch (Exception e) {}
                rs = null;
            }
            if (conn != null) {
                conn.close();
                conn = null;
            }
        }
    }

    public void loadFromDbByOrders() {
        Conn conn = new Conn(connname);
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        try {
            String LOADBYORDERS = "SELECT id, name, fullpath, diskname, visualpath, downloadCount FROM document_attach WHERE orders=? and doc_id=? and page_num=?";
            pstmt = conn.prepareStatement(LOADBYORDERS);
            pstmt.setInt(1, orders);
            pstmt.setInt(2, docId);
            pstmt.setInt(3, pageNum);
            rs = conn.executePreQuery();
            if (rs != null && rs.next()) {
                id = rs.getInt(1);
                name = rs.getString(2);
                fullPath = rs.getString(3);
                diskName = rs.getString(4);
                visualPath = rs.getString(5);
                downloadCount = rs.getInt(6);
                loaded = true;
            }
        } catch (SQLException e) {
            logger.error(e.getMessage());
        } finally {
            if (rs != null) {
                try {
                    rs.close();
                } catch (Exception e) {}
                rs = null;
            }
            if (conn != null) {
                conn.close();
                conn = null;
            }
        }
    }

    public String getFileExt() {
        return StrUtil.getFileExt(getDiskName());
    }

    private int orders = 0;
    private int pageNum;
    private boolean loaded = false;
    private int downloadCount = 0;
}