如何在sqlite android中插入多行 [英] how to insert multiple rows into sqlite android

问题描述

我有一个方法可以在类的sqlite中插入值.在主要活动中，我正在解析json值，并试图将值插入到循环中的sqlite中，因为我必须插入多个行.但是只有一行被添加到数据库中.

I have a method to insert values into sqlite in a class. And in the main activity i am parsing json values and trying to insert the values into sqlite in a loop as i have got to insert more than one row. But only one row is getting added into database.

添加多行的方法如下:

public void addSession(String sessionname,String start_time,String end_time,String id) {
        SQLiteDatabase db = this.getWritableDatabase();
        try {
            db.beginTransaction();
            String sql = "Insert into session (id, sessionname,start_time, end_time) values(?,?,?,?)";
            SQLiteStatement insert = db.compileStatement(sql);
            insert.bindString(1, id);
            insert.bindString(2, sessionname);
            insert.bindString(3, start_time);
            insert.bindString(4, end_time);
            insert.execute();
            db.setTransactionSuccessful();
        } catch (Exception e) {
            Log.w("Appet8:",e );
        } finally {
         db.endTransaction();
        }
    }

在下面的for循环中，我试图将值添加到sqlite表中:

JSONObject jsonObject = new JSONObject(response);
JSONArray foodsessions = jsonObject.getJSONArray("foodsessions");
for(int i=0;i<foodsessions.length();i++) {
                   JSONObject session_object = foodsessions.getJSONObject(i);
                   String session = session_object.getString("sessionname");
                   String start_time = session_object.getString("start_time");
                   String end_time = session_object.getString("end_time");
                   String session_id = session_object.getString("id");                                
 db.addSession(session,start_time,end_time,session_id);
                       }                       

推荐答案

更好的结构是在方法外部创建db引用，并将其作为引用传递:

A better structure would be create a db reference outside the method, and pass it as a reference:

SQLiteDatabase db = this.getWritableDatabase();
db.beginTransaction();

// your for loop

db.setTransactionSuccessful();
db.endTransaction();

=============== 请检查下面用于插入多行的内容:

============== Please check below which is used for insert multi rows:

// adb is SQLiteOpenHelper
JSONObject jsonObject = new JSONObject(response);
JSONArray foodsessions = jsonObject.getJSONArray("foodsessions");
int length = foodsessions.length();

for (int i = 0; i < length; i++) {
    JSONObject o = foodsessions.getJSONObject(i);
    String session = session_object.getString("sessionname");
    String start_time = session_object.getString("start_time");
    String end_time = session_object.getString("end_time");
    String session_id = session_object.getString("id");    

    SQLiteDatabase db = adb.getWritableDatabase();

    ContentValues newValues = new ContentValues();
    newValues.put(adb.ATTRIBUTE_session, session);
    newValues.put(adb.ATTRIBUTE_start_time, start_time);
    newValues.put(adb.ATTRIBUTE_end_time, end_time);
    newValues.put(adb.ATTRIBUTE_session_id, session_id);

    long res = db.insertWithOnConflict(adb.TABLE_NAME, null, newValues, SQLiteDatabase.CONFLICT_REPLACE);
    db.close();
}

如果可以通过SQLiteDatabase提供的方法完成原始查询，则是一种更好的解决方案.

A better solution is avoiding to use raw query if it can be done by the method provided by SQLiteDatabase.

这篇关于如何在sqlite android中插入多行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！