每日学习
作者：互联网
贴一下做体温统计app时候用到的几个dao层查询方法，以后可能会需要。
有两张数据表 一张记录体温信息（Tem） 一张记录用户信息（User）
主要就是sqlite的增删改查
1.体温信息相关方法（TemDao）
增加体温信息
public boolean insert(TemBean temBean){//增
SQLiteDatabase db = helper.getReadableDatabase();
Date date0 = new Date();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日 HH:mm");
String date = simpleDateFormat.format(date0);
ContentValues values = new ContentValues();
values.put("name",temBean.getName());
values.put("condition",temBean.getCondition());
values.put("date",date);
values.put("heat",temBean.getHeat());
values.put("place",temBean.getPlace());
values.put("health",temBean.getHealth());
long insert = db.insert("teminfo",null,values);
//System.out.println(temBean.getPlace());
return insert>0;
}
更改信息
public boolean update(TemBean temBean){//改
SQLiteDatabase db = helper.getReadableDatabase();
ContentValues values = new ContentValues();
values.put("name",temBean.getName());
values.put("condition",temBean.getCondition());
values.put("date",temBean.getDate());
values.put("heat",temBean.getHeat());
values.put("place",temBean.getPlace());
long update = db.update("teminfo",values,"id=?",new String[]{temBean.getId()+""});
System.out.println(temBean.getId());
return update>0;
}
查询信息（全部）
public List<TemBean> queryAll(){//查
List<TemBean> list = new ArrayList<>();
TemBean bean = null;
SQLiteDatabase db = helper.getReadableDatabase();
Cursor c = db.query("teminfo",null,null,null,null,null,null);
if(c != null && c.getCount()>0){
list = new ArrayList<>();
while(c.moveToNext()){
bean = new TemBean();
bean.setId(c.getInt(c.getColumnIndex("id")));
bean.setName(c.getString(c.getColumnIndex("name")));
bean.setCondition(c.getString(c.getColumnIndex("condition")));
bean.setDate(c.getString(c.getColumnIndex("date")));
bean.setHeat(c.getString(c.getColumnIndex("heat")));
bean.setPlace(c.getString(c.getColumnIndex("place")));
list.add(bean);
}
}
return list;
}
查询信息（根据'姓名'条件，返回的是list）
public List<TemBean> queryOne(String name){//根据姓名查单独一个人的体温信息
List<TemBean> list = new ArrayList<>();
TemBean bean = null;
SQLiteDatabase db = helper.getReadableDatabase();
Cursor c = db.query("teminfo",null,"name=?",new String[]{name},null,null,null);
if(c != null && c.getCount()>0){
list = new ArrayList<>();
while(c.moveToNext()){
bean = new TemBean();
bean.setId(c.getInt(c.getColumnIndex("id")));
bean.setName(c.getString(c.getColumnIndex("name")));
bean.setCondition(c.getString(c.getColumnIndex("condition")));
bean.setDate(c.getString(c.getColumnIndex("date")));
bean.setHeat(c.getString(c.getColumnIndex("heat")));
bean.setPlace(c.getString(c.getColumnIndex("place")));
bean.setHealth(c.getString(c.getColumnIndex("health")));
list.add(bean);
}
}
return list;
}
查询信息（根据'日期'条件模糊查询，返回的是int）
public int normalnum(){//查询体温正常人数,小于37度
SQLiteDatabase db = helper.getReadableDatabase();
Date date0=new Date();
SimpleDateFormat simpleDateFormat =new SimpleDateFormat("yyyy年MM月dd日");
String date = simpleDateFormat.format(date0);
int count=0;//统计人数用
Cursor c = db.rawQuery("select heat from teminfo where date like ?",new String[]{"%"+date+"%"});
while(c.moveToNext()){
String heat = c.getString(c.getColumnIndex("heat"));
double heat1 = Double.parseDouble(heat);
System.out.println(heat1);
//int heat1 = Integer.valueOf(heat).intValue();
if(heat1<37.0){
count++;
}
}
return count;
}
2.用户信息相关方法（UserDao）
增加一名用户信息
public boolean insert(TemBean temBean){//增
SQLiteDatabase db = helper.getReadableDatabase();
Date date0 = new Date();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日 HH:mm");
String date = simpleDateFormat.format(date0);
ContentValues values = new ContentValues();
values.put("name",temBean.getName());
values.put("condition",temBean.getCondition());
values.put("date",date);
values.put("heat",temBean.getHeat());
values.put("place",temBean.getPlace());
values.put("health",temBean.getHealth());
long insert = db.insert("teminfo",null,values);
//System.out.println(temBean.getPlace());
return insert>0;
}
查询用户总数（本质为返回数据表的行数）
public int usernum(){//查询用户总数
SQLiteDatabase db = helper.getReadableDatabase();
Cursor c = db.rawQuery("select count(*) from userinfo",null);
c.moveToFirst();
int count = c.getInt(0);
c.close();
return count;
}
根据'手机号'条件查询（返回String类型的'name'）
public String queryNameByPhone(String phone){//按条件查
SQLiteDatabase db = helper.getReadableDatabase();
Cursor c = db.query("userinfo",null,"phone=?",new String[]{phone},null,null,null);
if(c != null && c.getCount()>0){
while(c.moveToNext()){
String name = c.getString(c.getColumnIndex("name"));
return name;
}
}
return "false";
}
根据'手机号'条件查询其所有属性（返回list表）
public List<UserBean> queryAllByPhone(String phone){//查
List<UserBean> list = new ArrayList<>();
UserBean bean = null;
SQLiteDatabase db = helper.getReadableDatabase();
Cursor c = db.query("userinfo",null,"phone=?",new String[]{phone},null,null,null);
if(c != null && c.getCount()>0){
list = new ArrayList<>();
while(c.moveToNext()){
bean = new UserBean();
bean.setId(c.getInt(c.getColumnIndex("id")));
bean.setUid(c.getString(c.getColumnIndex("uid")));
bean.setName(c.getString(c.getColumnIndex("name")));
bean.setPhone(c.getString(c.getColumnIndex("phone")));
bean.setGrade(c.getString(c.getColumnIndex("grade")));
list.add(bean);
}
}
return list;
}
总结：感觉与'查询'有关的方法比较难写，查询的种类比较多，既涉及模糊查询，又需要分别根据不同的条件或者返回值类型，分别写查询方法，比较难搞。之前用MySQL和安卓用的SQLite，增删改查也有点不一样，有点难顶。
标签：getColumnIndex,每日,学习,bean,temBean,values,new,null 来源： https://www.cnblogs.com/Arisf/p/14502186.html