deletedb.java

ftp管理。构造网络路径部分比较好。内部有数据库截图。。

package common;

import java.sql.*;

/**
 * @author 隋玉杰 E-mail: [e-mail]
 * @version 创建时间：Nov 19, 2008 6:06:46 AM 类说明
 */
public class DeleteDb {
	/**
	 * @author 隋玉杰 E-mail: [e-mail]
	 * @version 创建时间：Nov 19, 2008 6:06:47 AM 循环找出要删除的子类
	 */
	public void delsontype(int c_id) {
		Connection conn = DAO.getConnection();
		Statement stmt = null;
		ResultSet rs = null;
		String tempfid = "";
		try {
			stmt = conn.createStatement();
			// 删除要删除的父类
			String sql = "update t_type set c_isdel=0 where c_id=" + c_id;
			stmt.executeUpdate(sql);
			// 删除这个父类下面的文件
			sql = "update t_file set c_isdel=0 where c_typeid=" + c_id;
			stmt.executeUpdate(sql);
			// 查找要删除的第一级子类，存入字符串tempfid
			sql = "select c_id from t_type where c_isdel=1 and c_fid =" + c_id;
			rs = stmt.executeQuery(sql);
			while (rs.next()) {
				tempfid = tempfid + "," + rs.getInt(1);
			}
			if (tempfid.length() > 1) {
				tempfid = tempfid.substring(1);
			}
			// 删除更低级的子类
			while (tempfid.length() > 1) {
				// 删除查到的子类
				sql = "update t_type set c_isdel=0 where c_isdel=1 and c_id in ("
						+ tempfid + ")";
				stmt.executeUpdate(sql);
				// 删除这些子类下面的文件
				sql = "update t_file set c_isdel=0 where c_isdel=1 and c_typeid in ("
						+ tempfid + ")";
				stmt.executeUpdate(sql);
				// 查找这些子类更低一级的子类
				sql = "select c_id from t_type where c_isdel=1 and c_fid in ("
						+ tempfid + ")";
				tempfid = "";
				rs = stmt.executeQuery(sql);
				while (rs.next()) {
					tempfid = tempfid + "," + rs.getInt(1);
				}
				if (tempfid.length() > 1) {
					tempfid = tempfid.substring(1);
				}
			}
			rs.close();
			stmt.close();
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		DeleteDb db = new DeleteDb();
		int c_id = 1;
		db.delsontype(c_id);
	}
}