Java 从多个表检索数据-Android Eclipse

我正在使用UNION从多个表执行搜索界面。在搜索词中过滤的类是SimpleCorsAdapter表单，我的问题是当我单击搜索词以获取其信息时，唯一看到的是一个白色空白页

下面是我检索“获取更多信息”单词的代码。我认为问题出在WHERE条件下。请帮帮我。谢谢

commandId = getIntent().getIntExtra("COMMAND_ID", 0);
SQLiteDatabase db = (new DBHelper(this)).getWritableDatabase();
final String commandIdString = String.valueOf(commandId);
Cursor cursor = db.rawQuery("SELECT _id AS _id, name AS name, desc AS desc, syntax AS syntax, option AS option FROM comm_acc WHERE _id = ? " +
        "UNION SELECT _id AS _id, name AS name, desc AS desc, syntax AS syntax, option AS option FROM comm_filems WHERE _id = ? " +
        "UNION SELECT _id AS _id, name AS name, desc AS desc, syntax AS syntax, option AS option FROM comm_psu WHERE _id = ? " +
        "UNION SELECT _id AS _id, name AS name, desc AS desc, syntax AS syntax, option AS option FROM comm_shells WHERE _id = ? " +
        "UNION SELECT _id AS _id, name AS name, desc AS desc, syntax AS syntax, option AS option FROM comm_sic WHERE _id = ? " +
        "UNION SELECT _id AS _id,name AS name, desc AS desc, syntax AS syntax, option AS option FROM comm_stp WHERE _id = ?", 
        new String[]{commandIdString, commandIdString, commandIdString, commandIdString, commandIdString, commandIdString});


if (cursor.getCount() == 1)
{
        cursor.moveToFirst();

        commandName = (TextView) findViewById (R.id.commandName);
        commandName.setText(cursor.getString(cursor.getColumnIndex("name")));

        commandDesc = (TextView) findViewById (R.id.commandDesc);
        commandDesc.setText(cursor.getString(cursor.getColumnIndex("desc")));

        commandSyntax = (TextView) findViewById (R.id.commandSyntax);
        commandSyntax.setText(cursor.getString(cursor.getColumnIndex("syntax")));

        commandOption = (TextView) findViewById (R.id.commandOption);
        commandOption.setText(cursor.getString(cursor.getColumnIndex("option")));

}

}

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对于原始查询中使用的每个参数，必须设置要替换的值，因此

new String[]{""+commandId}

仅适用于列表中的第一个参数。换成

final String commandIdString = String.valueOf(commandId);
new String[]{commandIdString, commandIdString, commandIdString, commandIdString, commandIdString, commandIdString}

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您是否对DB使用了结果SQL查询？它不会解决您的问题，但是：“+commandId”很混乱。为什么不改为使用：String.valueOf（commandId）？我已经编辑了代码，请再次查看。还是一样，白色的空白页。还是一样，只有白色的一页。请再次查看，我已经编辑了代码。关于“您是否对DB使用了结果SQL查询？”-部分，以排除SQL语法相关问题？是的，我尝试过在没有WHERE条件的情况下执行它，它工作正常。我的WHERE条件是否有问题？您的工作是找出问题所在-调试代码，找到完整的SQL查询，执行它，检查结果，并检查LogCat是否发生任何异常。