android - 如何删除数据库中没有id的行

Question

我的应用程序中有一个空闲数据库。如何删除任何行？我的数据库代码如下：

mydb=Nickname.this.openOrCreateDatabase("private", 0, null);
            mydb.execSQL("CREATE TABLE IF NOT EXISTS numbers(nickname varchar,number INT(13))");

有谁知道这怎么可能？

mydb=Clear.this.openOrCreateDatabase("private", 0, null);
            mydb.execSQL("CREATE TABLE IF NOT EXISTS numbers(_id INTEGER PRIMARY KEY,nickname varchar,number INT(13))");
mydb.execSQL("DELETE FROM numbers WHERE id='=?' AND number='"+num+"'");

//num is string which contains which number i wish to delete

Answer 1

SQLDatabase对象有一个删除方法。public int delete (String table, String whereClause, String[] whereArgs)

mydb.delete(TABLE, "nickname = "+ DatabaseUtils.sqlEscapeString(name), null);

Answer 2

mydb.execSQL("DELETE FROM your_db.your_table WHERE  <write your SQL conditions here> ");