diff --git a/app/src/main/java/com/monke/monkeybook/dao/DbHelper.java b/app/src/main/java/com/monke/monkeybook/dao/DbHelper.java index d9f3154..a50a4a7 100644 --- a/app/src/main/java/com/monke/monkeybook/dao/DbHelper.java +++ b/app/src/main/java/com/monke/monkeybook/dao/DbHelper.java @@ -1,41 +1,48 @@ -//Copyright (c) 2017. 章钦豪. All rights reserved. +// 包名声明 package com.monke.monkeybook.dao; - +// 导入SQLiteDatabase类，用于操作数据库 import android.database.sqlite.SQLiteDatabase; +// 导入MApplication类，用于获取应用上下文 import com.monke.monkeybook.MApplication; -public class DbHelper { - private DaoMaster.DevOpenHelper mHelper; - private SQLiteDatabase db; - private DaoMaster mDaoMaster; - private DaoSession mDaoSession; +public class DbHelper {// DbHelper类，用于管理GreenDao数据库连接 + private DaoMaster.DevOpenHelper mHelper; // DaoMaster.DevOpenHelper实例，用于创建和管理数据库 + private SQLiteDatabase db; // SQLiteDatabase实例，用于数据库操作 + private DaoMaster mDaoMaster; // DaoMaster实例，用于管理DAO + private DaoSession mDaoSession; // DaoSession实例，用于数据库会话 - private DbHelper(){ + private DbHelper(){// 私有构造方法，采用单例模式 + // 创建DaoMaster.DevOpenHelper实例，指定数据库名称为"monkebook_db"，游标工厂为null mHelper = new DaoMaster.DevOpenHelper(MApplication.getInstance(), "monkebook_db", null); + // 获取可写的SQLiteDatabase实例 db = mHelper.getWritableDatabase(); // 注意：该数据库连接属于 DaoMaster，所以多个 Session 指的是相同的数据库连接。 - mDaoMaster = new DaoMaster(db); - mDaoSession = mDaoMaster.newSession(); + mDaoMaster = new DaoMaster(db);// 创建DaoMaster实例，使用获取的SQLiteDatabase实例 + mDaoSession = mDaoMaster.newSession();// 创建DaoSession实例 } + // DbHelper的单例实例 private static DbHelper instance; - public static DbHelper getInstance(){ - if(null == instance){ - synchronized (DbHelper.class){ - if(null == instance){ - instance = new DbHelper(); + public static DbHelper getInstance(){// 获取DbHelper单例实例的方法 + if(null == instance){// 判断单例实例是否为空 + synchronized (DbHelper.class){// 同步块，保证线程安全 + if(null == instance){// 再次判断单例实例是否为空，避免重复创建 + instance = new DbHelper();// 创建DbHelper实例 } } } + // 返回单例实例 return instance; } - public DaoSession getmDaoSession() { + public DaoSession getmDaoSession() {// 获取DaoSession实例的方法 + // 返回DaoSession实例 return mDaoSession; } - public SQLiteDatabase getDb() { + public SQLiteDatabase getDb() { // 获取SQLiteDatabase实例的方法 + // 返回SQLiteDatabase实例 return db; } } diff --git a/app/src/main/java/com/monke/monkeybook/dao/DownloadChapterBeanDao.java b/app/src/main/java/com/monke/monkeybook/dao/DownloadChapterBeanDao.java index b13abc0..e816e52 100644 --- a/app/src/main/java/com/monke/monkeybook/dao/DownloadChapterBeanDao.java +++ b/app/src/main/java/com/monke/monkeybook/dao/DownloadChapterBeanDao.java @@ -1,185 +1,241 @@ +// 包名声明 package com.monke.monkeybook.dao; -import android.database.Cursor; -import android.database.sqlite.SQLiteStatement; +import android.database.Cursor; // 导入Cursor类，用于读取数据库查询结果 +import android.database.sqlite.SQLiteStatement; // 导入SQLiteStatement类，用于执行SQL语句 -import org.greenrobot.greendao.AbstractDao; -import org.greenrobot.greendao.Property; -import org.greenrobot.greendao.internal.DaoConfig; -import org.greenrobot.greendao.database.Database; -import org.greenrobot.greendao.database.DatabaseStatement; +import org.greenrobot.greendao.AbstractDao; // 导入AbstractDao类，GreenDao框架中数据库操作的抽象基类 +import org.greenrobot.greendao.Property; // 导入Property类，GreenDao框架中数据库字段的属性类 +import org.greenrobot.greendao.internal.DaoConfig; // 导入DaoConfig类，GreenDao框架中用于配置Dao对象的配置信息 +import org.greenrobot.greendao.database.Database; // 导入Database类，GreenDao框架中数据库操作的接口 +import org.greenrobot.greendao.database.DatabaseStatement; // 导入DatabaseStatement类，GreenDao框架中用于执行SQL语句的接口 +// 导入DownloadChapterBean类 import com.monke.monkeybook.bean.DownloadChapterBean; // THIS CODE IS GENERATED BY greenDAO, DO NOT EDIT. -/** +/** * DAO for table "DOWNLOAD_CHAPTER_BEAN". -*/ -public class DownloadChapterBeanDao extends AbstractDao { - + */ +public class DownloadChapterBeanDao extends AbstractDao { // DownloadChapterBeanDao类继承AbstractDao，主键类型为String + // 表名常量，表示数据库表的名称 public static final String TABLENAME = "DOWNLOAD_CHAPTER_BEAN"; /** * Properties of entity DownloadChapterBean.
* Can be used for QueryBuilder and for referencing column names. - */ - public static class Properties { - public final static Property NoteUrl = new Property(0, String.class, "noteUrl", false, "NOTE_URL"); - public final static Property DurChapterIndex = new Property(1, int.class, "durChapterIndex", false, "DUR_CHAPTER_INDEX"); - public final static Property DurChapterUrl = new Property(2, String.class, "durChapterUrl", true, "DUR_CHAPTER_URL"); - public final static Property DurChapterName = new Property(3, String.class, "durChapterName", false, "DUR_CHAPTER_NAME"); - public final static Property Tag = new Property(4, String.class, "tag", false, "TAG"); - public final static Property BookName = new Property(5, String.class, "bookName", false, "BOOK_NAME"); - public final static Property CoverUrl = new Property(6, String.class, "coverUrl", false, "COVER_URL"); + */ + public static class Properties {// 属性类，定义DownloadChapterBean实体类的属性 + public final static Property NoteUrl = new Property(0, String.class, "noteUrl", false, "NOTE_URL");// noteUrl属性 + public final static Property DurChapterIndex = new Property(1, int.class, "durChapterIndex", false, "DUR_CHAPTER_INDEX");// durChapterIndex属性 + public final static Property DurChapterUrl = new Property(2, String.class, "durChapterUrl", true, "DUR_CHAPTER_URL");// durChapterUrl属性，主键 + public final static Property DurChapterName = new Property(3, String.class, "durChapterName", false, "DUR_CHAPTER_NAME");// durChapterName属性 + public final static Property Tag = new Property(4, String.class, "tag", false, "TAG");// tag属性 + public final static Property BookName = new Property(5, String.class, "bookName", false, "BOOK_NAME");// bookName属性 + public final static Property CoverUrl = new Property(6, String.class, "coverUrl", false, "COVER_URL");// coverUrl属性 }; - public DownloadChapterBeanDao(DaoConfig config) { - super(config); + public DownloadChapterBeanDao(DaoConfig config) {// 构造函数，传入DaoConfig配置，初始化父类 + super(config);// 调用父类构造函数 } - - public DownloadChapterBeanDao(DaoConfig config, DaoSession daoSession) { - super(config, daoSession); + + public DownloadChapterBeanDao(DaoConfig config, DaoSession daoSession) {// 传入DaoConfig和DaoSession对象，初始化父类 + super(config, daoSession);// 调用父类构造函数 } /** Creates the underlying database table. */ - public static void createTable(Database db, boolean ifNotExists) { + public static void createTable(Database db, boolean ifNotExists) {// 创建表的方法，传入Database对象和是否忽略表已存在的标志 + // 判断是否忽略表已存在，构造SQL语句的一部分 String constraint = ifNotExists? "IF NOT EXISTS ": ""; - db.execSQL("CREATE TABLE " + constraint + "\"DOWNLOAD_CHAPTER_BEAN\" (" + // - "\"NOTE_URL\" TEXT," + // 0: noteUrl - "\"DUR_CHAPTER_INDEX\" INTEGER NOT NULL ," + // 1: durChapterIndex - "\"DUR_CHAPTER_URL\" TEXT PRIMARY KEY NOT NULL ," + // 2: durChapterUrl - "\"DUR_CHAPTER_NAME\" TEXT," + // 3: durChapterName - "\"TAG\" TEXT," + // 4: tag - "\"BOOK_NAME\" TEXT," + // 5: bookName - "\"COVER_URL\" TEXT);"); // 6: coverUrl + db.execSQL("CREATE TABLE " + constraint + "\"DOWNLOAD_CHAPTER_BEAN\" (" + //执行创建表的SQL语句 + "\"NOTE_URL\" TEXT," + // 0: noteUrl.表中字段NOTE_URL，数据类型为TEXT + "\"DUR_CHAPTER_INDEX\" INTEGER NOT NULL ," + // 1: durChapterIndex.DUR_CHAPTER_INDEX字段，整型，非空 + "\"DUR_CHAPTER_URL\" TEXT PRIMARY KEY NOT NULL ," + // 2: durChapterUrl.DUR_CHAPTER_URL字段，文本类型，主键，非空 + "\"DUR_CHAPTER_NAME\" TEXT," + // 3: durChapterName.DUR_CHAPTER_NAME字段，文本类型 + "\"TAG\" TEXT," + // 4: tag.TAG字段，文本类型 + "\"BOOK_NAME\" TEXT," + // 5: bookName.BOOK_NAME字段，文本类型 + "\"COVER_URL\" TEXT);"); // 6: coverUrl.COVER_URL字段，文本类型 } - /** Drops the underlying database table. */ - public static void dropTable(Database db, boolean ifExists) { + /** Drops the underlying database table. + * 删除数据库表 + */ + public static void dropTable(Database db, boolean ifExists) {// 删除表的方法，传入Database对象和是否忽略表不存在的标志 + // 构造删除表的SQL语句 String sql = "DROP TABLE " + (ifExists ? "IF EXISTS " : "") + "\"DOWNLOAD_CHAPTER_BEAN\""; + // 执行删除表的SQL语句 db.execSQL(sql); } @Override + // 将实体对象绑定到DatabaseStatement语句中 protected final void bindValues(DatabaseStatement stmt, DownloadChapterBean entity) { + // 清空绑定 stmt.clearBindings(); - + + // 获取noteUrl值 String noteUrl = entity.getNoteUrl(); + // 判断noteUrl是否为空 if (noteUrl != null) { + // 绑定noteUrl值到第一个参数位置 stmt.bindString(1, noteUrl); } + // 绑定durChapterIndex值到第二个参数位置 stmt.bindLong(2, entity.getDurChapterIndex()); - + + // 获取durChapterUrl值 String durChapterUrl = entity.getDurChapterUrl(); + // 判断durChapterUrl是否为空 if (durChapterUrl != null) { + // 绑定durChapterUrl值到第三个参数位置 stmt.bindString(3, durChapterUrl); } - + + // 获取durChapterName值 String durChapterName = entity.getDurChapterName(); + // 判断durChapterName是否为空 if (durChapterName != null) { + // 绑定durChapterName值到第四个参数位置 stmt.bindString(4, durChapterName); } - + + // 获取tag值 String tag = entity.getTag(); + // 判断tag是否为空 if (tag != null) { + // 绑定tag值到第五个参数位置 stmt.bindString(5, tag); } - + + // 获取bookName值 String bookName = entity.getBookName(); + // 判断bookName是否为空 if (bookName != null) { + // 绑定bookName值到第六个参数位置 stmt.bindString(6, bookName); } - + + // 获取coverUrl值 String coverUrl = entity.getCoverUrl(); + // 判断coverUrl是否为空 if (coverUrl != null) { + // 绑定coverUrl值到第七个参数位置 stmt.bindString(7, coverUrl); } } @Override + // 将实体对象绑定到SQLiteStatement语句中.与上面的方法基本一致，只是使用的Statement类型不同 protected final void bindValues(SQLiteStatement stmt, DownloadChapterBean entity) { + // 清空绑定 stmt.clearBindings(); - + + // 获取noteUrl值 String noteUrl = entity.getNoteUrl(); + // 判断noteUrl是否为空 if (noteUrl != null) { - stmt.bindString(1, noteUrl); + stmt.bindString(1, noteUrl);// 绑定noteUrl值到第一个参数位置 } - stmt.bindLong(2, entity.getDurChapterIndex()); - + stmt.bindLong(2, entity.getDurChapterIndex());// 绑定durChapterIndex值到第二个参数位置 + + // 获取durChapterUrl值 String durChapterUrl = entity.getDurChapterUrl(); + // 判断durChapterUrl是否为空 if (durChapterUrl != null) { - stmt.bindString(3, durChapterUrl); + stmt.bindString(3, durChapterUrl);// 绑定durChapterUrl值到第三个参数位置 } - + + // 获取durChapterName值 String durChapterName = entity.getDurChapterName(); + // 判断durChapterName是否为空 if (durChapterName != null) { - stmt.bindString(4, durChapterName); + stmt.bindString(4, durChapterName);// 绑定durChapterName值到第四个参数位置 } - + + // 获取tag值 String tag = entity.getTag(); + // 判断tag是否为空 if (tag != null) { - stmt.bindString(5, tag); + stmt.bindString(5, tag); // 绑定tag值到第五个参数位置 } - + + // 获取bookName值 String bookName = entity.getBookName(); + // 判断bookName是否为空 if (bookName != null) { - stmt.bindString(6, bookName); + stmt.bindString(6, bookName);// 绑定bookName值到第六个参数位置 } - + + // 获取coverUrl值 String coverUrl = entity.getCoverUrl(); + // 判断coverUrl是否为空 if (coverUrl != null) { - stmt.bindString(7, coverUrl); + stmt.bindString(7, coverUrl);// 绑定coverUrl值到第七个参数位置 } } @Override + // 从游标读取主键 public String readKey(Cursor cursor, int offset) { + // 读取第三列（索引为2），如果为空返回null，否则返回字符串 return cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2); - } + } @Override + // 从游标读取实体对象 public DownloadChapterBean readEntity(Cursor cursor, int offset) { + // 创建DownloadChapterBean对象 DownloadChapterBean entity = new DownloadChapterBean( // - cursor.isNull(offset + 0) ? null : cursor.getString(offset + 0), // noteUrl - cursor.getInt(offset + 1), // durChapterIndex - cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2), // durChapterUrl - cursor.isNull(offset + 3) ? null : cursor.getString(offset + 3), // durChapterName - cursor.isNull(offset + 4) ? null : cursor.getString(offset + 4), // tag - cursor.isNull(offset + 5) ? null : cursor.getString(offset + 5), // bookName - cursor.isNull(offset + 6) ? null : cursor.getString(offset + 6) // coverUrl + cursor.isNull(offset + 0) ? null : cursor.getString(offset + 0), // noteUrl + cursor.getInt(offset + 1), // durChapterIndex + cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2), // durChapterUrl + cursor.isNull(offset + 3) ? null : cursor.getString(offset + 3), // durChapterName + cursor.isNull(offset + 4) ? null : cursor.getString(offset + 4), // tag + cursor.isNull(offset + 5) ? null : cursor.getString(offset + 5), // bookName + cursor.isNull(offset + 6) ? null : cursor.getString(offset + 6) // coverUrl ); + // 返回创建的DownloadChapterBean对象 return entity; } - + @Override + // 将游标数据读取到实体对象中 public void readEntity(Cursor cursor, DownloadChapterBean entity, int offset) { - entity.setNoteUrl(cursor.isNull(offset + 0) ? null : cursor.getString(offset + 0)); - entity.setDurChapterIndex(cursor.getInt(offset + 1)); - entity.setDurChapterUrl(cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2)); - entity.setDurChapterName(cursor.isNull(offset + 3) ? null : cursor.getString(offset + 3)); - entity.setTag(cursor.isNull(offset + 4) ? null : cursor.getString(offset + 4)); - entity.setBookName(cursor.isNull(offset + 5) ? null : cursor.getString(offset + 5)); - entity.setCoverUrl(cursor.isNull(offset + 6) ? null : cursor.getString(offset + 6)); - } - + entity.setNoteUrl(cursor.isNull(offset + 0) ? null : cursor.getString(offset + 0));// 设置noteUrl + entity.setDurChapterIndex(cursor.getInt(offset + 1));// 设置durChapterIndex + entity.setDurChapterUrl(cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2));// 设置durChapterUrl + entity.setDurChapterName(cursor.isNull(offset + 3) ? null : cursor.getString(offset + 3));// 设置durChapterName + entity.setTag(cursor.isNull(offset + 4) ? null : cursor.getString(offset + 4));// 设置tag + entity.setBookName(cursor.isNull(offset + 5) ? null : cursor.getString(offset + 5));// 设置bookName + entity.setCoverUrl(cursor.isNull(offset + 6) ? null : cursor.getString(offset + 6));// 设置coverUrl + } + @Override + // 插入后更新主键 protected final String updateKeyAfterInsert(DownloadChapterBean entity, long rowId) { + // 返回durChapterUrl作为主键 return entity.getDurChapterUrl(); } - + @Override + // 获取主键 public String getKey(DownloadChapterBean entity) { + // 判断实体对象是否为空 if(entity != null) { + // 返回durChapterUrl作为主键 return entity.getDurChapterUrl(); } else { + // 实体对象为空，返回null return null; } } @Override + // 判断实体是否可更新 protected final boolean isEntityUpdateable() { + // 返回true，表示实体可更新 return true; } - + } diff --git a/app/src/main/java/com/monke/monkeybook/dao/SearchHistoryBeanDao.java b/app/src/main/java/com/monke/monkeybook/dao/SearchHistoryBeanDao.java index 47e9aa0..a5e21e3 100644 --- a/app/src/main/java/com/monke/monkeybook/dao/SearchHistoryBeanDao.java +++ b/app/src/main/java/com/monke/monkeybook/dao/SearchHistoryBeanDao.java @@ -1,136 +1,171 @@ +// 包名声明 package com.monke.monkeybook.dao; -import android.database.Cursor; -import android.database.sqlite.SQLiteStatement; +import android.database.Cursor;// 用于从数据库查询结果中读取数据 +import android.database.sqlite.SQLiteStatement;// 用于从数据库查询结果中读取数据 -import org.greenrobot.greendao.AbstractDao; -import org.greenrobot.greendao.Property; -import org.greenrobot.greendao.internal.DaoConfig; -import org.greenrobot.greendao.database.Database; -import org.greenrobot.greendao.database.DatabaseStatement; +import org.greenrobot.greendao.AbstractDao;// GreenDao框架提供的抽象DAO类 +import org.greenrobot.greendao.Property;// GreenDao框架提供的属性类，用于定义数据库表的字段属性 +import org.greenrobot.greendao.internal.DaoConfig;// GreenDao框架提供的DAO配置类 +import org.greenrobot.greendao.database.Database;// GreenDao框架提供的数据库操作接口 +import org.greenrobot.greendao.database.DatabaseStatement;// GreenDao框架提供的数据库语句执行接口 -import com.monke.monkeybook.bean.SearchHistoryBean; +import com.monke.monkeybook.bean.SearchHistoryBean;// 搜索历史Bean类 // THIS CODE IS GENERATED BY greenDAO, DO NOT EDIT. -/** +/** * DAO for table "SEARCH_HISTORY_BEAN". -*/ -public class SearchHistoryBeanDao extends AbstractDao { - + */ +public class SearchHistoryBeanDao extends AbstractDao {// 继承AbstractDao，主键类型为Long + // 数据库表名 public static final String TABLENAME = "SEARCH_HISTORY_BEAN"; /** * Properties of entity SearchHistoryBean.
* Can be used for QueryBuilder and for referencing column names. - */ + */ public static class Properties { - public final static Property Id = new Property(0, Long.class, "id", true, "_id"); - public final static Property Type = new Property(1, int.class, "type", false, "TYPE"); - public final static Property Content = new Property(2, String.class, "content", false, "CONTENT"); - public final static Property Date = new Property(3, long.class, "date", false, "DATE"); + // 定义SearchHistoryBean实体类的属性 + public final static Property Id = new Property(0, Long.class, "id", true, "_id");// id属性，主键，自增 + public final static Property Type = new Property(1, int.class, "type", false, "TYPE");// type属性，整型 + public final static Property Content = new Property(2, String.class, "content", false, "CONTENT");// content属性，字符串 + public final static Property Date = new Property(3, long.class, "date", false, "DATE");// date属性，长整型 }; - public SearchHistoryBeanDao(DaoConfig config) { + public SearchHistoryBeanDao(DaoConfig config) {// 构造函数，传入DAO配置 + // 调用父类构造函数 super(config); } - - public SearchHistoryBeanDao(DaoConfig config, DaoSession daoSession) { + + public SearchHistoryBeanDao(DaoConfig config, DaoSession daoSession) {// 构造函数，传入DAO配置和DAO会话 + // 调用父类构造函数 super(config, daoSession); } - /** Creates the underlying database table. */ - public static void createTable(Database db, boolean ifNotExists) { + /** Creates the underlying database table. + *创建数据库表 + */ + public static void createTable(Database db, boolean ifNotExists) {// 创建表的静态方法 + // 判断是否需要检查表是否存在，构建SQL语句 String constraint = ifNotExists? "IF NOT EXISTS ": ""; + // 执行创建表语句 db.execSQL("CREATE TABLE " + constraint + "\"SEARCH_HISTORY_BEAN\" (" + // - "\"_id\" INTEGER PRIMARY KEY AUTOINCREMENT ," + // 0: id - "\"TYPE\" INTEGER NOT NULL ," + // 1: type - "\"CONTENT\" TEXT," + // 2: content - "\"DATE\" INTEGER NOT NULL );"); // 3: date + "\"_id\" INTEGER PRIMARY KEY AUTOINCREMENT ," + // 0: id _id列，主键，自增 + "\"TYPE\" INTEGER NOT NULL ," + // 1: type TYPE列，整型，非空 + "\"CONTENT\" TEXT," + // 2: content CONTENT列，文本类型 + "\"DATE\" INTEGER NOT NULL );"); // 3: date DATE列，整型，非空 } - /** Drops the underlying database table. */ - public static void dropTable(Database db, boolean ifExists) { + /** Drops the underlying database table. + *删除数据库表 + */ + public static void dropTable(Database db, boolean ifExists) {// 删除表的静态方法 + // 构建删除表语句 String sql = "DROP TABLE " + (ifExists ? "IF EXISTS " : "") + "\"SEARCH_HISTORY_BEAN\""; + // 执行删除表语句 db.execSQL(sql); } @Override + // 将实体对象绑定到DatabaseStatement语句 protected final void bindValues(DatabaseStatement stmt, SearchHistoryBean entity) { + // 清除之前的绑定 stmt.clearBindings(); - + + // 获取实体对象的id Long id = entity.getId(); + // 判断id是否为空 if (id != null) { - stmt.bindLong(1, id); + stmt.bindLong(1, id);// 绑定id到第一个参数 } - stmt.bindLong(2, entity.getType()); - + stmt.bindLong(2, entity.getType());// 绑定type到第二个参数 + + // 获取实体对象的content String content = entity.getContent(); + // 判断content是否为空 if (content != null) { + // 绑定content到第三个参数 stmt.bindString(3, content); } - stmt.bindLong(4, entity.getDate()); + stmt.bindLong(4, entity.getDate());// 绑定date到第四个参数 } - @Override + @Override// 将实体对象绑定到SQLiteStatement语句, 和上面方法类似，只是Statement类型不同 protected final void bindValues(SQLiteStatement stmt, SearchHistoryBean entity) { + // 清除之前的绑定 stmt.clearBindings(); - + + // 获取实体对象的id Long id = entity.getId(); + // 判断id是否为空 if (id != null) { - stmt.bindLong(1, id); + stmt.bindLong(1, id);// 绑定id到第一个参数 } - stmt.bindLong(2, entity.getType()); - + stmt.bindLong(2, entity.getType());// 绑定type到第二个参数 + + // 获取实体对象的content String content = entity.getContent(); + // 判断content是否为空 if (content != null) { - stmt.bindString(3, content); + stmt.bindString(3, content);// 绑定content到第三个参数 } - stmt.bindLong(4, entity.getDate()); + stmt.bindLong(4, entity.getDate());// 绑定date到第四个参数 } @Override + // 从Cursor读取主键 public Long readKey(Cursor cursor, int offset) { + // 从Cursor的第offset+0列读取Long类型的主键，如果为空则返回null return cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0); - } + } @Override + // 从Cursor读取实体对象 public SearchHistoryBean readEntity(Cursor cursor, int offset) { SearchHistoryBean entity = new SearchHistoryBean( // - cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0), // id - cursor.getInt(offset + 1), // type - cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2), // content - cursor.getLong(offset + 3) // date + cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0), // id + cursor.getInt(offset + 1), // type + cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2), // content + cursor.getLong(offset + 3) // date ); + // 返回创建的SearchHistoryBean对象 return entity; } - + @Override + // 将Cursor数据读入到实体对象中 public void readEntity(Cursor cursor, SearchHistoryBean entity, int offset) { - entity.setId(cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0)); - entity.setType(cursor.getInt(offset + 1)); - entity.setContent(cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2)); - entity.setDate(cursor.getLong(offset + 3)); - } - + entity.setId(cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0));// 设置id + entity.setType(cursor.getInt(offset + 1));// 设置type + entity.setContent(cursor.isNull(offset + 2) ? null : cursor.getString(offset + 2));// 设置content + entity.setDate(cursor.getLong(offset + 3));// 设置date + } + @Override + // 插入数据后更新主键 protected final Long updateKeyAfterInsert(SearchHistoryBean entity, long rowId) { + // 设置主键为rowId entity.setId(rowId); + // 返回rowId return rowId; } - + @Override + // 获取主键 public Long getKey(SearchHistoryBean entity) { + // 判断实体对象是否为空 if(entity != null) { - return entity.getId(); + return entity.getId();// 返回实体对象的id } else { - return null; + return null;// 返回null } } @Override + // 判断实体是否可更新 protected final boolean isEntityUpdateable() { - return true; + return true;// 返回true，表示实体可更新 } - + }