首先是一个DB工具类
package com.shiyou.lxbd.db; import java.io.File; import java.io.IOException; import com.shiyou.lxbd.utils.Utils; import android.database.Cursor; import android.database.sqlite.sqliteDatabase; /** * 数据库类 最近观看 * @author Administrator * */ public class RecentlyWatchDB { private static final String DB_NAME = "lxbd.db";// 数据库名 public static final String STUDENT_TABLE = "lx";// 表名 public static final String _ID = "_id";// id public static final String MID = "mid";// id public static final String TITLE = "title";// 标题 public static final String Plogo = "plogo";// 图片地址 public static final String LINKS = "links"; // 视频链接 public static final String DURATION = "duration"; // 时长 public static final String INFO = "info"; // 简介 public static final String score = "score"; // 评分 public static final String VIP = "vip"; // 是否vip标识 public static final String TIME = "time";// 时间 //创建表的sql private static final String CREATE_TABLE = "create table " + STUDENT_TABLE + " ( " + _ID + " Integer primary key autoincrement," + MID + " text," + TITLE + " text," + Plogo + " text," + LINKS + " text," + DURATION + " text," + INFO + " text," + score + " Integer," + VIP + " text," + TIME + " text)"; //判断表是否存在系统数据库中的sql private static String sql = "select count(*) as c from sqlite_master where type ='table' and name ='" + STUDENT_TABLE + "' "; /** * 创建数据库和表 * @return sqliteDatabase对象 */ public static sqliteDatabase db() { boolean result = false; Cursor cursor = null; sqliteDatabase db = null; //获取sdCard路径,设置数据库保存路径 String dbPath = Utils.getSdCard() + "/lxbd"; File dbp = new File(dbPath); File dbf = new File(dbPath + "/" + DB_NAME); //判断目录是否存在,不存在则创建 if (!dbp.exists()) { dbp.mkdir(); } // 数据库文件是否创建成功 boolean isFileCreateSuccess = false; if (!dbf.exists()) { try { isFileCreateSuccess = dbf.createNewFile(); } catch (IOException ioex) { } } else { isFileCreateSuccess = true; } if (isFileCreateSuccess) { //判断系统数据库中是否存在某个表 db = sqliteDatabase.openorCreateDatabase(dbf,null); cursor = db.rawQuery(sql,null); if (cursor.movetoNext()) { int count = cursor.getInt(0); if (count > 0) { result = true; } } //如果不存在表则创建表 if (!result) { db.execsql(CREATE_TABLE); } } return db; } /** * 关闭数据库 */ public static void closeDB(sqliteDatabase db) { db.close(); } }
以下的操作主要看自己要实现的功能来定,最主要的是上面的RecentlyWatchDB类
写入数据到数据库
/** * 放进去写入到数据库 */ sqliteDatabase db = RecentlyWatchDB.db(); Cursor cursor = db.query(RecentlyWatchDB.STUDENT_TABLE,null,RecentlyWatchDB.MID + "=?",new String[] { videoInfoList .get(position).getId() },null); // 判断数据库是否存在这个ID 的视频 if (cursor != null && cursor.movetoFirst()) { // 如果存在 则修改日期 ContentValues values = new ContentValues(); values.put(RecentlyWatchDB.TIME,Utils.getCurrentDatestr()); db.update( RecentlyWatchDB.STUDENT_TABLE,values,new String[] { videoInfoList.get(position).getId() }); } else { // 如果不存在 则新添加一条 ContentValues values = new ContentValues(); values.put(RecentlyWatchDB.MID,videoInfoList.get(position) .getId()); values.put(RecentlyWatchDB.TITLE,videoInfoList.get(position) .getTitle()); values.put(RecentlyWatchDB.DURATION,videoInfoList.get(position).getDuration()); values.put(RecentlyWatchDB.INFO,videoInfoList.get(position) .getInfo()); values.put(RecentlyWatchDB.score,videoInfoList.get(position) .getscore()); values.put(RecentlyWatchDB.Plogo,videoInfoList.get(position) .getPlogo()); values.put(RecentlyWatchDB.TIME,Utils.getCurrentDatestr()); db.insert(RecentlyWatchDB.STUDENT_TABLE,values); } db.close();
在使用的地方取出来
/** * 取出来 */ sqliteDatabase db = RecentlyWatchDB.db(); List<Videosql> persons = null; Cursor cursor = db.query(true,RecentlyWatchDB.STUDENT_TABLE,"time desc",null); if (cursor != null) { persons = new ArrayList<Videosql>(); while (cursor.movetoNext()) { Videosql vs = new Videosql(); String id = cursor.getString(cursor .getColumnIndex(RecentlyWatchDB.MID)); String title = cursor.getString(cursor .getColumnIndex(RecentlyWatchDB.TITLE)); String plogo = cursor.getString(cursor .getColumnIndex(RecentlyWatchDB.Plogo)); String duration = cursor.getString(cursor .getColumnIndex(RecentlyWatchDB.DURATION)); String info = cursor.getString(cursor .getColumnIndex(RecentlyWatchDB.INFO)); int score = cursor.getInt(cursor .getColumnIndex(RecentlyWatchDB.score)); String time = cursor.getString(cursor .getColumnIndex(RecentlyWatchDB.TIME)); vs.setId(id); vs.setTitle(title); vs.setPlogo(plogo); vs.setDuration(duration); vs.setInfo(info); vs.setscore(score); vs.setTime(time); persons.add(vs); } } if (persons.size() >= 20) { for (int i = 0; i < 20; i++) { Video video = new Video(); video.setId(persons.get(i).getId()); video.setTitle(persons.get(i).getTitle()); video.setPlogo(persons.get(i).getPlogo()); video.setDuration(persons.get(i).getDuration()); video.setInfo(persons.get(i).getInfo()); video.setscore(persons.get(i).getscore()); historyvideoList.add(video); } String timeDelete = persons.get(19).getTime(); db.delete(RecentlyWatchDB.STUDENT_TABLE,RecentlyWatchDB.TIME + "<?",new String[] { timeDelete }); } else { for (int i = 0; i < persons.size(); i++) { Video video = new Video(); video.setId(persons.get(i).getId()); video.setTitle(persons.get(i).getTitle()); video.setPlogo(persons.get(i).getPlogo()); video.setDuration(persons.get(i).getDuration()); video.setInfo(persons.get(i).getInfo()); video.setscore(persons.get(i).getscore()); historyvideoList.add(video); } } db.close();
原文地址:https://www.jb51.cc/sqlite/200623.html
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