Java android.database.sqlite.SQLiteException:接近“”：语法错误（代码1）：通过匹配两个不同的关键字从数据库读取时出错

我试图通过匹配整数ID和特定字符串来获取/读取数据，但在编译代码时，我遇到以下错误：

> android.database.sqlite.SQLiteException: near "Computing": syntax
> error (code 1): , while compiling: SELECT * FROM midSemAnsBank WHERE
> id = 4 AND subject = Cloud Computing

以下是我正在尝试的：

> android.database.sqlite.SQLiteException: near "Computing": syntax
> error (code 1): , while compiling: SELECT * FROM midSemAnsBank WHERE
> id = 4 AND subject = Cloud Computing

    openReadable();
    String select_query= "SELECT * FROM " +MID_SEM_ANSWERS_TABLE + " WHERE " + KEY_ID + " = " + answerID +" AND " + KEY_SUBJECT + " = " + subject +" " ;
    Log.d(LOG, select_query);
    Cursor c= m_sqLiteDatabase.rawQuery(select_query,null);
    if(c!=null)
        c.moveToFirst();

---

通过匹配两个关键字读取数据的正确查询是什么？

字符串应该介于两个关键字之间，因此：

> android.database.sqlite.SQLiteException: near "Computing": syntax
> error (code 1): , while compiling: SELECT * FROM midSemAnsBank WHERE
> id = 4 AND subject = Cloud Computing

String select_query= "SELECT * FROM " +MID_SEM_ANSWERS_TABLE + " WHERE " + 
     KEY_ID + " = " + answerID +" AND " + KEY_SUBJECT + " = '" + subject + "'";
//----------------------------------------------------------^---------------^

注

> android.database.sqlite.SQLiteException: near "Computing": syntax
> error (code 1): , while compiling: SELECT * FROM midSemAnsBank WHERE
> id = 4 AND subject = Cloud Computing

重要的是，您的代码仍然不安全，并且可能会导致语法错误或SQL注入，我建议改用PreparedStatement，请阅读更多相关信息

> android.database.sqlite.SQLiteException: near "Computing": syntax
> error (code 1): , while compiling: SELECT * FROM midSemAnsBank WHERE
> id = 4 AND subject = Cloud Computing