android:SQLiteOpenHelper 与 greenDao 数据库操作

原文地址:http://blog.csdn.net/intbird

项目里使用的是greeDao,sqllite是以前练习使用的,

如果项目里全用这个,人会比较累;

然而greenDao使用起来非常方便,可以说是三分钟速成

如不明白请看官方文档,源码里也有详细说明.

===================

@GreenDao

官网链接:http://greendao-orm.com/documentation/how-to-get-started/

官网DEMO:https://github.com/greenrobot/greenDAO

public static void save(Locations locs) {
SQLiteDatabase db = Frame.getInstance().getDbHelp().getWritableDatabase();
DaoMaster master = new DaoMaster(db);
DaoSession session = master.newSession();
DbLocationsDao locsDao = session.getDbLocationsDao();
locsDao.insertOrReplace(locs); ;
db.close();
}

public static void deletedFromLast(long lastId){
SQLiteDatabase db = Frame.getInstance().getDbHelp().getWritableDatabase();
DaoMaster master = new DaoMaster(db);
DaoSession session = master.newSession();
DbLocationsDao locsDao = session.getDbLocationsDao();

QueryBuilder<DbLocations> query = locsDao.queryBuilder();
DeleteQuery<DbLocations> delete = query.where(Properties.Time.le(lastId)).buildDelete();
delete.executeDeleteWithoutDetachingEntities();
db.close();
}

public static long getDbSize(){
SQLiteDatabase db = Frame.getInstance().getDbHelp().getWritableDatabase();
DaoMaster master = new DaoMaster(db);
DaoSession session = master.newSession();
DbLocationsDao locsDao = session.getDbLocationsDao();
long size = locsDao.queryBuilder().count();
return size;
}

public static List<DbLocations> getDataBySize(int size){
SQLiteDatabase db = Frame.getInstance().getDbHelp().getWritableDatabase();
DaoMaster master = new DaoMaster(db);
DaoSession session = master.newSession();
DbLocationsDao locsDao = session.getDbLocationsDao();

List<DbLocations> list =  locsDao.queryBuilder().limit(size).orderAsc(Properties.Time).build().list();
db.close();
return list;
}

============

@SqlLiteOpenHelper

例子

package mode;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import core.override.MyselfDishAdapter;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.*;

public class DishSqlite extends SQLiteOpenHelper {

private static final String TB_NAME = "tb_dishMode";
private static final String CREATE_TABLE_SQL = "create table "+TB_NAME+"("
+ DishMode.ds_id+" integer primary key autoincrement,"
+ DishMode.ds_name+" text,"
+ DishMode.ds_cover+"  text,"
+ DishMode.ds_img+ " text,"
+ DishMode.ds_tips+ " text,"
+ DishMode.ds_addTime+ " text)";
public DishSqlite(Context context) {
super(context, TB_NAME, null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE_SQL);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// db.execSQL("ALTER TABLE tb_student ADD COLUMN other STRING");
// SCHMA_VERSION
}

public void executeSql(String sql) {
this.getWritableDatabase().execSQL(sql);
this.getWritableDatabase().close();
}

/**
** 查询
**/
public ArrayList<Map<String,String>> getAllDataInDB(String state) {
ArrayList<Map<String,String>> listmap = new ArrayList<Map<String,String>>();
Cursor cur = getWritableDatabase().query(TB_NAME, null, null, null,
null, null, null);// 查询并获得游标
if (cur.moveToFirst()) {// 判断游标是否为空
do {
Map<String,String> map=new HashMap<String, String>();
int id = cur.getInt(cur.getColumnIndex(DishMode.ds_id ));
String statedb=cur.getString(cur.getColumnIndex(DishMode.ds_state));
if(statedb.equals(state)){
String name=cur.getString(cur.getColumnIndex(DishMode.ds_name));
String dishCover=cur.getString(cur.getColumnIndex(DishMode.ds_cover));
String dishTime=cur.getString(cur.getColumnIndex(DishMode.ds_addTime));
map.put("id", id+"");
map.put("style", MyselfDishAdapter.styleNormal+"");
map.put("name", name);
map.put("img", dishCover);
map.put("addTime", dishTime);
listmap.add(map);
}
} while (cur.moveToNext());
cur.close();
this.getWritableDatabase().close();
}
return listmap;
}

/**
* 插入一条数据;
*/
public int insert(DishMode upData) {
ContentValues cv = new ContentValues();
cv.put(DishMode.ds_name, upData.getName());
cv.put(DishMode.ds_cover, upData.getCover());
cv.put(DishMode.ds_img, upData.getImg());
cv.put(DishMode.ds_state, upData.getState());
cv.put(DishMode.ds_burden, upData.getBurden());
cv.put(DishMode.ds_makes, upData.getMakes());
cv.put(DishMode.ds_tips, upData.getTips());
cv.put(DishMode.ds_addTime, upData.getAddTime());

long id = this.getWritableDatabase().insert(TB_NAME, null, cv);
this.getWritableDatabase().close();
return (int)id;
}
/**
* 修改一条数据;
*/
public int update(DishMode upData) {
ContentValues cv = new ContentValues();
cv.put(DishMode.ds_name, upData.getName());
cv.put(DishMode.ds_cover, upData.getCover());
cv.put(DishMode.ds_img, upData.getImg());
cv.put(DishMode.ds_state, upData.getState());
cv.put(DishMode.ds_burden, upData.getBurden());
cv.put(DishMode.ds_makes, upData.getMakes());
cv.put(DishMode.ds_tips, upData.getTips());
cv.put(DishMode.ds_addTime, upData.getAddTime());

int row= this.getWritableDatabase().update(TB_NAME, cv,null,null);
this.getWritableDatabase().close();
return row;
}
/**
* 删除
*/
public boolean deleteById(int id) {
int i = this.getWritableDatabase().delete(TB_NAME, DishMode.ds_id+"=" +  Integer.valueOf(id) + "",
null);
this.getWritableDatabase().close();
if (i > 0)
return true;
else
return false;
}