如何在sqlite android中插入多行

Question

我有一种方法可以将值插入到类中的sqlite 中。在主要活动中，我正在解析 json 值并尝试在循环中将这些值插入sqlite，因为我必须插入多行。但是只有一行被添加到数据库中。

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，我尝试将值添加到 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);
                       }                       

Answer 1

更好的结构是在方法外部创建一个 db 引用，并将其作为引用传递：

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

// your for loop

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

=============== 请检查下面哪个用于插入多行：

// 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，更好的解决方案是避免使用原始查询。

Answer 2

这更简单：

INSERT INTO tb_units (sort, name, isdef) VALUES
(1, "عدد",1),
(2, "کیلوگرم",1),
(3, "گرم",1),
(4, "کیلومتر",1),
(5, "متر",1),
(6, "متراژ",1),
(7, "مگابایت",1),
(8, "کیلوبایت",1),
(9, "مثقال",1),
(10, "شاخه",1),
(11, "صفحه",1),
(12, "رول",1),
(13, "بسته",1),
(14, "کارتن",1),
(15, "دستگاه",1),
(16, "پاکت",1),
(17, "مورد",1),
(18, "جعبه",1),
(19, "تن",1),
(20, "قطعه",1),
(21, "حلقه",1),
(22, "تخته",1),
(23, "جلد",1),
(24, "لیتر",1),
(25, "مترمکعب",1),
(26, "مترمربع",1),
(27, "دست",1),
(28, "جین",1),
(29, "اشتراک",1),
(30, "سری",1),
(31, "گیگابایت",1),
(32, "جلسه",1),
(33, "جفت",1),
(34, "قراض",1),
(35, "ساعت",1),
(36, "تن",1);

我们用db.execSQL查询