将json数据添加到数据库

public class MyHelper extends SQLiteOpenHelper {
public MyHelper(Context context) {
super(context, "dataa.db", null, 1);
}

@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
//创建表
sqLiteDatabase.execSQL("create table jsoncache(id integer primary key autoincrement,json text not null,url text not null)");

}

@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

}
}

public class JsonDao {

private MyHelper myHelper;

public JsonDao(Context context) {

myHelper = new MyHelper(context);
}

/**
* 插入数据的操作
*/
public void insertJson(String json,String url){

SQLiteDatabase database = myHelper.getWritableDatabase();
//现根据url删除json
database.delete("jsoncache","url = ?",new String[]{url});

//再去添加
ContentValues values = new ContentValues();
values.put("json",json);
values.put("url",url);

database.insert("jsoncache",null,values);

//关闭
database.close();
}

/**
* 查询数据库的操作....根据传入url获取存的json字符串
*/
public String getJson(String url){

SQLiteDatabase writableDatabase = myHelper.getWritableDatabase();

Cursor cursor = writableDatabase.query("jsoncache", new String[]{"json"}, "url = ?", new String[]{url}, null, null, null);

if (cursor.moveToNext()){
String json = cursor.getString(cursor.getColumnIndex("json"));

return json;
}

return null;
}

}

jsonDao = new JsonDao(getContext());
//1.先读取数据库中存的数据....有数据,解析展示....无数据,网络获取数据
String json = jsonDao.getJson("http://gank.io/api/data/Android/10/" + page_num);
if (json != null){
//解析 显示

Gson gson = new Gson();

DataDataBean dataDataBean = gson.fromJson(json, DataDataBean.class);

//往后面添加...
list.addAll(dataDataBean.getResults());

//设置适配器
setAdapter();

}else {
//1.设置listView的适配器
getDataFromNet();
}