rawQuery（query，selectionArgs）

Question

我想使用select查询从表中检索数据。我找到了rawQuery(query, selectionArgs)类的SQLiteDatabase方法来检索数据。但我不知道如何将query和selectionArgs传递给rawQuery方法？

Answer 1

rawQuery("SELECT id, name FROM people WHERE name = ? AND id = ?", new String[] {"David", "2"});

您传递的字符串数组具有相同数量的元素，因为您有“？”

Answer 2

也许这可以帮到你

Cursor c = db.rawQuery("query",null);
int id[] = new int[c.getCount()];
int i = 0;
if (c.getCount() > 0) 
{               
    c.moveToFirst();
    do {
        id[i] = c.getInt(c.getColumnIndex("field_name"));
        i++;
    } while (c.moveToNext());
    c.close();
}

Answer 3

rawQuery的一个示例 - db.rawQuery("select * from table where column = ?",new String[]{"data"});

Answer 4

为了完整性和正确的资源管理：

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        <item name="buttonBarButtonStyle">@style/StackedButtonBarButtonStyle</item>
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    <style name="StackedButtonBarButtonStyle" parent="Widget.AppCompat.Button.ButtonBar.AlertDialog">
        <item name="android:layout_gravity">right</item>
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    </style>

Answer 5

请参阅以下代码，它可能会对您有所帮助。

String q = "SELECT * FROM customer";
Cursor mCursor = mDb.rawQuery(q, null);

或

String q = "SELECT * FROM customer WHERE _id = " + customerDbId  ;
Cursor mCursor = mDb.rawQuery(q, null);

Answer 6

如果您的SQL查询是

SELECT name,roll FROM student WHERE name='Amit' AND roll='7'

然后rawQuery将

String query="SELECT id, name FROM people WHERE name = ? AND roll = ?";
String[] selectionArgs = {"Amit","7"} 
db.rawQuery(query, selectionArgs);

Answer 7

String mQuery = "SELECT Name,Family From tblName";
Cursor mCur = db.rawQuery(mQuery, new String[]{});
mCur.moveToFirst();
while ( !mCur.isAfterLast()) {
        String name= mCur.getString(mCur.getColumnIndex("Name"));
        String family= mCur.getString(mCur.getColumnIndex("Family"));
        mCur.moveToNext();
}

姓名和家庭是你的结果