Question

在我的Android应用中，我试图从SQLite中删除一行。对不起，我是这个＆amp;所以可能会问一些愚蠢的事情。之前我使用此查询进行删除：

    String queryToExecute = "DELETE FROM " + Constants.TABLE_STATS
            + " WHERE " + Constants.COL_ID + " IN " + "(SELECT "
            + Constants.COL_ID + " FROM " + Constants.TABLE_STATS
            + " WHERE " + Constants.COL_NAME + " = '" + name
            + "' AND " + Constants.COL_ID_ONE + " = " + idOne
            + " AND " + Constants.COL_DB_ID + " = " + dbId
            + " ORDER BY " + Constants.COL_DATE + " DESC" + " LIMIT 1)";
    databaseConn.execSQL(queryToExecute);

但我正在尝试将此转换为参数化查询，如下所示：

    String whereClause =        
            "? IN " + "(SELECT ? FROM ? WHERE ? = '?' AND ? = " + idOne
            + " AND ? = " + dbId
            + " ORDER BY ? DESC" + " LIMIT 1)";

    String[] whereArgs = {Constants.COL_ID, Constants.COL_ID, Constants.TABLE_STATS, Constants.COL_NAME, name, Constants.COL_ID_ONE, Constants.COL_DB_ID, Constants.COL_DATE};
     int numOfRowsDeleted =
     databaseConn.delete(Constants.TABLE_STATS, whereClause,
     whereArgs);

但是这导致了崩溃说

android.database.sqlite.SQLiteException：near＆＃34;？＆＃34 ;:语法错误（代码1）:,同时编译：DELETE FROM my_table WHERE？ IN（SELECT？FROM？WHERE？=＆＃39;？＆＃39; AND？= 1 AND？= 1 ORDER BY？DESC LIMIT 1）

任何帮助？

Answer 1

您只能使用?来绑定文字，而不是表格或列名称等标识符。绑定文字时，?不得自行引用（'?'是包含?的字符串文字，而不是占位符。）

如果您已经有一个正常运行的delete()原始SQL，我真的没有意识到尝试使用execSQL()的意义。您也可以将?占位符与execSQL()一起使用，例如name等字符串文字。

Android SQLite：删除语句准备查询的问题

1 个答案: