android - 从 SQLite Android 获取单个记录

Question

我有一个EditText，我在上面写下了我想在单击按钮后出现在TextView中的记录

所以我需要从我的数据库和特定列中检索行记录 我想要检索的是字符串类型 **这是我的查询，但它对我不起作用**

 public String getCountryCode(String cc) {

 Cursor cursor = null;
 String Code = "";
 try{
     String selectQuery = "SELECT  * FROM " + SQLITE_TABLE + " WHERE "
            + KEY_CODE + " = " + cc;
     cursor = mDb.rawQuery(selectQuery, null);


     if(cursor.getCount() > 0) {

         cursor.moveToFirst();
         Code = cursor.getString(cursor.getColumnIndex("KEY_CODE"));
     }

     return Code;
 }finally {

     cursor.close();
 }
 }

主要 Activity

b.setOnClickListener(new OnClickListener() {

public void onClick(View arg0) {
// TODO Auto-generated method stub
    try{
String in   =codeinput.getText().toString();
String c    = dbHelper.getCountryCode(in);
CountryShow.setText(c);
}
catch(Exception e ){
    Toast.makeText(listViewDisplay.this, e.getMessage(),      Toast.LENGTH_LONG).show();
}


}
});

Answer 1

将查询字符串替换为该字符串

String selectQuery = "SELECT  * FROM " + SQLITE_TABLE + " WHERE "
        + KEY_CODE + " = '" + cc+"'";

当您要将通用值添加到查询字符串中时，您需要在其周围添加单个 qouts