上一篇 总结了grendao 环境搭建以及简单的增删查改,接下来将全面解析框架的使用,基于上篇的orm模型（Note)数据库讲解

GreenDao的插入:

插入的方式有很多:

daoSession.getNoteDao().insert(note);

 //插入note 如果note指定主键与表中已经存在了，就会发生异常（android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: tb_note._id (code 1555)）而插入不进去

 daoSession.insert(note); 同上

 daoSession.getNoteDao().insertOrReplace(note);

当主键存在的时候会替换，所以能够很好的执行插入操作,推荐

 daoSession.insertOrReplace(note); 同上

原生的sqlite

 String insertSql = String.format("insert into %s (%s,%s,%s) values('%s','%s','%s')",
        NoteDao.TABLENAME,
        NoteDao.Properties.Title.columnName,
        NoteDao.Properties.Content.columnName,
        NoteDao.Properties.CreateTime.columnName,
        note.getTitle(),
        note.getContent(),
        note.getCreateTime());
   daoSession.getDatabase().execSQL(insertSql);

批量插入

 public void insertBatch(List<Note> notes){
    daoSession.getNoteDao().insertInTx(notes);
  }

GreenDao的更新操作

1:单条更新(唯一性条件是主键相同)

  public void update(Note note) throws Exception {
        daoSession.update(note);
      //  daoSession.getNoteDao().update(note);
   }

2:批量更新 

 //批量更新
   public void updateBatch(List<Note> notes) throws Exception {
       daoSession.getNoteDao().updateInTx(notes);
   }

3:原生sql：

 public void updateSql(String sql){
    //  daoSession.getDatabase().execSQL("update .....");
     daoSession.getDatabase().execSQL(sql);
  }

GreenDao 的删除操作

1:单条删除(唯一性是主见相同)

  public void delete(Note note) throws Exception {
      daoSession.delete(note);
     // daoSession.getNoteDao().delete(note);
   }

2: 单条删除 指定主键删除

  public void delete(long id) {
       daoSession.getNoteDao().deleteByKey(id);
   }

3:批量删除

 public void deleteBatch(List<Note> notes) {
     daoSession.getNoteDao().deleteInTx(notes);
  }

4:批量按主键删除 

 // 批量按主键删除
   public void deleteBatchByKey(List<Long> pkIds) {
     daoSession.getNoteDao().deleteByKeyInTx(pkIds);
   }

5:删除所有 

  public void deleteAll() throws Exception {
    daoSession.deleteAll(Note.class);
    //   daoSession.getNoteDao().deleteAll();
  }

6:原始sqlite语句

 daoSession.getDatabase().execSQL(deletesql);

GreenDao 查询操作 也是最复杂的

1:单条查询

//按主键查询  
public Note query(long pk) throws Exception {  
   // daoSession.getNoteDao().load(pk);//按主见查询  
    //daoSession.getNoteDao().load(rowId);//按行号查询  
    return daoSession.load(Note.class, pk);  
} 

2: QueryBuilder 复合查询

public List<Note> queryBuider() throws Exception {  
     //select from tb_note where Content like 'greendao'  
     return daoSession.getNoteDao().queryBuilder().where(NoteDao.Properties.Content.like("greendao")).build().list();  
 }  

public long queryBuider2(long pk) throws Exception {  
     //select count(*) from tb_note where Content like 'greendao'  
     return daoSession.getNoteDao().queryBuilder().where(NoteDao.Properties.Content.like("greendao")).buildCount().count();  
 } 

public void queryBuider3() throws Exception {  
       Cursor cursor = null;  
       try {  
           //CursorQuery 部分查询  
           CursorQuery greendao = daoSession.getNoteDao().queryBuilder().where(NoteDao.Properties.Content.like("greendao")).buildCursor();  
           cursor = greendao.query();  
           while (cursor.moveToNext()) {  
               long id = cursor.getInt(0);  
               String title = cursor.getString(1);  
               String content = cursor.getString(2);  
               String time = cursor.getString(cursor.getColumnIndex(NoteDao.Properties.CreateTime.columnName));  
           }  
       } finally {  
           if (cursor != null)  
               cursor.close();  
       }  
   }  

3:查询所有:

public void queryAll()  
{  
    daoSession.loadAll(Note.class);  
    daoSession.queryBuilder(Note.class).build().list();  
    daoSession.getNoteDao().queryBuilder().build().list();  
    daoSession.getNoteDao().loadAll();  
}