实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
package com.gqq.tangpoem; import java.lang.annotation.Retention; import java.security.PublicKey; import java.util.*; import android.content.*; import android.database.*; import android.database.sqlite.*; import android.util.*; public class DataDb { public static final String DATADB_NAME = "tangshi.db"; private static final String DATA_TABLE_NAME = "tangsong"; private SQLiteDatabase db; private String path; public DataDb(Context context, String path) { this.path = path; db = context.openOrCreateDatabase(path, Context.MODE_PRIVATE, null); } public void closeDB() { if (null != db) db.close(); } public void openDB() { if (null != db) SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.CREATE_IF_NECESSARY); } public int[] getMaxMinId() { String sql = "select max(id) as max, min(id) as min from tangsong where `status`=1;"; int[] ids = { 0, 0 }; Cursor c = db.rawQuery(sql, null); if (c.moveToNext()) { ids[0] = c.getInt(c.getColumnIndex("max")); ids[1] = c.getInt(c.getColumnIndex("min")); } // db.close(); return ids; } public Poem getPoem(int id) { int[] ids = getMaxMinId(); // 鐗╂瀬蹇呭弽锛屽鏋滃埌浜嗘渶澶х殑id锛屽垯鍥炲埌鏈�灏忕殑 if (id >= ids[0]) id = ids[0]; else if (id <= ids[1]) { id = ids[1]; } try { String sql = "SELECT * from " DATA_TABLE_NAME " where `status`=1 and id=" id; Log.d(MainActivity.TAG_DATABASE, sql); Cursor c = db.rawQuery(sql, null); return genPoem(c); } catch (Exception e) { e.printStackTrace(); db.close(); return null; } } public Poem getNextPoem(int id) { int[] ids = getMaxMinId(); // 鐗╂瀬蹇呭弽锛屽鏋滃埌浜嗘渶澶х殑id锛屽垯鍥炲埌鏈�灏忕殑 if (id >= ids[0]) return getPoem(ids[1]); try { String sql = "SELECT * from " DATA_TABLE_NAME " where `status`=1 and id>" id " order by id limit 1;"; Log.d(MainActivity.TAG_DATABASE, sql); Cursor c = db.rawQuery(sql, null); return genPoem(c); } catch (Exception e) { e.printStackTrace(); db.close(); return null; } } public Poem getPrePoem(int id) { int[] ids = getMaxMinId(); if (id <= ids[1]) return getPoem(ids[0]); try { String sql = "SELECT * from " DATA_TABLE_NAME " where `status`=1 and id<" id " order by id desc limit 1;"; Log.d(MainActivity.TAG_DATABASE, sql); Cursor c = db.rawQuery(sql, null); return genPoem(c); } catch (Exception e) { e.printStackTrace(); db.close(); return null; } } /** * 鏍规嵁浼犲叆鐨勬父鏍囩敓鎴愪竴涓狿oem瀵硅薄 * * @param c * 浼犲叆鐨勬父鏍� * @return Poem瀵硅薄 */ private Poem genPoem(Cursor c) { Poem shiCi = null; if (c.moveToNext()) { int newId = c.getInt(c.getColumnIndex("id")); int type = c.getInt(c.getColumnIndex("type")); PoemType pType = Common.getType(type); String author = c.getString(c.getColumnIndex("author")); String cipai = c.getString(c.getColumnIndex("cipai")); String title = c.getString(c.getColumnIndex("title")); String content = c.getString(c.getColumnIndex("content")); String comment = c.getString(c.getColumnIndex("comment")); shiCi = new Poem(newId, pType, author, cipai, title, content, comment); } db.close(); return shiCi; } /** * 鍙栧緱鎵�鏈夌殑璇楄瘝鏂� * * @return 璇楄瘝鍒楄〃 */ public List<Poem> getAll() { String sql = "SELECT * from " DATA_TABLE_NAME " where `status` = 1;"; return getPoemFromSql(sql); } /** * 鍙栧緱鎵�鏈夌殑璇� * * @return 璇楄瘝鍒楄〃 */ public List<Poem> getPoems() { String sql = "SELECT * from " DATA_TABLE_NAME " where `type`=0 and `status` = 1;"; return getPoemFromSql(sql); } /** * 鍙栧緱鎵�鏈夌殑璇� * * @return 璇楄瘝鍒楄〃 */ public List<Poem> getSongs() { String sql = "SELECT * from " DATA_TABLE_NAME " where `type`=1 and `status` = 1;"; return getPoemFromSql(sql); } /** * 鍙栧緱鎵�鏈夌殑鏂� * * @return 璇楄瘝鍒楄〃 */ public List<Poem> getEssays() { String sql = "SELECT * from " DATA_TABLE_NAME " where `type`=9 and `status` = 1;"; return getPoemFromSql(sql); } /** * 鍙栧緱鎵�鏈夌殑宸茬粡鍒犻櫎鐨勮瘲璇� * * @return 璇楄瘝鍒楄〃 */ public List<Poem> getAllDeletedPoems() { String sql = "SELECT * from " DATA_TABLE_NAME " where `status` = 99;"; return getPoemFromSql(sql); } /** * 鍙栧緱鎵�鏈夌殑鐔熸倝鐨勭殑璇楄瘝 * * @return 璇楄瘝鍒楄〃 */ public List<Poem> getAllFamiliarPoems() { String sql = "SELECT * from " DATA_TABLE_NAME " where `status` = 0;"; return getPoemFromSql(sql); } private List<Poem> getPoemFromSql(String sql) { List<Poem> list = new ArrayList<Poem>(); Cursor c = db.rawQuery(sql, null); while (c.moveToNext()) { int id = c.getInt(c.getColumnIndex("id")); int type = c.getInt(c.getColumnIndex("type")); PoemType pType = Common.getType(type); String author = c.getString(c.getColumnIndex("author")); String cipai = c.getString(c.getColumnIndex("cipai")); String title = c.getString(c.getColumnIndex("title")); String content = c.getString(c.getColumnIndex("content")); String comment = c.getString(c.getColumnIndex("comment")); Poem shiCi = new Poem(id, pType, author, cipai, title, content, comment); list.add(shiCi); } db.close(); return list; } /** * 鎻掑叆涓�棣栨柊璇� * * @param type * 绫诲瀷锛�0锛氳瘲锛�1锛氳瘝 * @param author * 浣滆�� * @param title * 棰樼洰 * @param cipai * 璇嶇墝鍚� * @param content * 璇楄瘝鍐呭 * @return 鏄惁鎻掑叆鎴愬姛 */ public int insertPoem(int type, String author, String title, String cipai, String content) { String sql = "insert into " DATA_TABLE_NAME " (`status`, type, author,cipai,title, comment, content) values (1, " type ", '" author "',"; sql = "'" cipai "',"; sql = "'" title "',"; sql = "'" "鏆傛椂鏃犳敞閲婏紒" "',"; sql = "'" content "');"; Log.d("Sql", sql); try { db.execSQL(sql); } catch (Exception e) { db.close(); e.printStackTrace(); return 0; } int[] ids = getMaxMinId(); db.close(); return ids[0]; } /** * 淇敼涓�棣栬瘲璇� * * @param type * 绫诲瀷锛�0锛氳瘲锛�1锛氳瘝 * @param author * 浣滆�� * @param title * 棰樼洰 * @param cipai * 璇嶇墝鍚� * @param content * 璇楄瘝鍐呭 * @return 鏄惁鎻掑叆鎴愬姛 */ public boolean updatePoem(int id, int type, String author, String title, String cipai, String content) { String sql = "update " DATA_TABLE_NAME " set `type`=" type ", author='" author; sql = "', title='" title; sql = "', cipai='" cipai; sql = "', content='" content; sql = "' where id=" id; Log.d("Sql", sql); try { db.execSQL(sql); db.close(); return true; } catch (Exception e) { db.close(); e.printStackTrace(); return false; } } /** * 鏇存柊璇楄瘝鐨勮瘎璁� * * @param id * id * @param cm * 璇勮 * @return */ public boolean updatePoemComment(int id, String cm) { String sql = "update " DATA_TABLE_NAME " set `comment`='" cm; sql = "' where id=" id; Log.d("Sql", sql); try { db.execSQL(sql); db.close(); return true; } catch (Exception e) { db.close(); e.printStackTrace(); return false; } } /** * 鍒犻櫎涓�棣栬瘲璇� * * @param id * 璇楄瘝id * @return */ public boolean delPoem(int id) { String sql = "update " DATA_TABLE_NAME " set `status` = 99 where id = " id; Log.d(MainActivity.TAG_DATABASE, sql); try { db.execSQL(sql); db.close(); return true; } catch (Exception e) { db.close(); e.printStackTrace(); return false; } } }
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