java.lang.OutOfMemoryError: [memory exhausted] while reading data from Sqlite Android

Question

我已成功将数据保存在 SQLite 数据库中。但是我在从我的 SQLite 数据库中读取数据时遇到错误，然后我的应用程序崩溃了。

error message

01-01 05:42:13.916 607-607/com.example.eyesaver I/dalvikvm:   | sysTid=607 nice=0 sched=0/0 cgrp=apps handle=68313184
01-01 05:42:13.916 607-607/com.example.eyesaver I/dalvikvm:   | sysTid=607 nice=0 sched=0/0 cgrp=apps handle=68313184
01-01 05:42:13.916 607-607/com.example.eyesaver I/dalvikvm:   | state=R schedstat=( 0 0 0 ) utm=2910 stm=2910 core=0
01-01 05:42:13.916 607-607/com.example.eyesaver I/dalvikvm:   | state=R schedstat=( 0 0 0 ) utm=2910 stm=2910 core=0
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at android.database.CursorWindow.nativeGetString(Native Method)
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at android.database.CursorWindow.nativeGetString(Native Method)
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at android.database.CursorWindow.getString(CursorWindow.java:434)
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at android.database.CursorWindow.getString(CursorWindow.java:434)
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at com.example.eyesaver.SQ_Lite_DB.ReadSqliteData(SQ_Lite_DB.java:59)
01-01 05:42:13.917 607-607/com.example.eyesaver I/dalvikvm:     at com.example.eyesaver.SQ_Lite_DB.ReadSqliteData(SQ_Lite_DB.java:59)// I marked this line in code

和

1-01 05:42:16.189 607-607/com.example.eyesaver E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.eyesaver, PID: 607
    java.lang.OutOfMemoryError: [memory exhausted]
        at dalvik.system.NativeStart.main(Native Method)
01-01 05:42:16.189 607-607/com.example.eyesaver E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.eyesaver, PID: 607
    java.lang.OutOfMemoryError: [memory exhausted]
        at dalvik.system.NativeStart.main(Native Method)

我正在使用 'ReadSqliteData()' 方法从我的 SQLite 中读取数据

ReadSqliteData() method

public void ReadSqliteData(Context context){
    ArrayList<Model> list = new ArrayList<>();
    Adpter adpter = new Adpter(list,context);
    SQLiteDatabase database = getWritableDatabase();
    Cursor cursor = database.rawQuery("Select name, image from orders",null);
    if (cursor.moveToFirst()){
        while (cursor.moveToFirst()){
            Model model = new Model();
            model.setImage(cursor.getString(0));   //i am getting error here 
            model.setName(cursor.getString(1));    //i am getting error here 
            list.add(model);
        }
        adpter.notifyDataSetChanged();
    }
    cursor.close();
    database.close();
}

还有一个问题：我在SQLite数据库中的id为null，不知道为什么？我正在创建这样的 table

@Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(
                "Create Table orders"+
                        "(id INTERGER PRIMARY KEY,"+
                        "image text ,"+
                        "name text)"
        );
    }

如果您需要任何其他信息，请告诉我。

Answer 1

尝试使用以下代码。

//update your table create query, id should be auto increment and also your query was not in correct form.

 db.execSQL(
            "Create Table orders"+
                    "("+ id INTEGER PRIMARY KEY AUTOINCREMENT,"+
                    "image text ,"+
                    "name text" +")"
    );


//update you read method code
 public void ReadSqliteData(Context context){
ArrayList<Model> list = new ArrayList<>();
Adpter adpter = new Adpter(list,context);
SQLiteDatabase database = getReadableDatabase();
Cursor cursor = database.rawQuery("Select name, image from orders",null);
if (cursor.moveToNext()){
    while (cursor.moveToFirst()){
        Model model = new Model();
        model.setImage(cursor.getString(0));   
        model.setName(cursor.getString(1));   
        list.add(model);

    }
    adpter.notifyDataSetChanged();
}
cursor.close();
database.close();
}

Answer 2

您的循环永远不会结束，因为在每次迭代中您都将游标的索引设置在第一行 moveToFirst() 而没有前进到下一行。
仅使用 moveToNext()：

public void ReadSqliteData(Context context){
    ArrayList<Model> list = new ArrayList<>();
    Adpter adpter = new Adpter(list,context);
    SQLiteDatabase database = getWritableDatabase();
    Cursor cursor = database.rawQuery("Select name, image from orders",null);
    while (cursor.moveToNext()){
        Model model = new Model();
        model.setImage(cursor.getString(0));            
        model.setName(cursor.getString(1));    
        list.add(model);
    }
    adpter.notifyDataSetChanged();
    cursor.close();
    database.close();
}

java.lang.OutOfMemoryError: [memory exhausted] while reading data from Sqlite Android

java.lang.OutOfMemoryError: [memory exhausted] while reading data from Sqlite Android

java

android

sqlite

android-sqlite

sqliteopenhelper