SQLite提供了＃34;重复的列名称＆＃34; ，但没有重复的列名称

Question

据说我有重复的列名，但我不知道。看看这段代码

这是我的架构类：

public  class CrimeDBSchema {

    public static final class CrimeTable{
        public static final String NAME = "crimes";


        public static final class Cols{

            public static final String UUID = "uuid";
            public static final String TITLE = "title";
            public static final String DATE = "date";
            public static final String SOLVED = "solved";

        }

    }
}

这是扩展SQLiteOpenHelper的类：

public class CrimeBaseHelper extends SQLiteOpenHelper {

    private static final int VERSION = 1;
    private static final String DATABASE_NAME = "crimeBase.db";

    public CrimeBaseHelper(Context context){
        super(context, DATABASE_NAME, null, VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

        db.execSQL("create table "+ CrimeTable.NAME + "(" +
                "_id integer primary key autoincrement, " +
                CrimeTable.Cols.UUID + ", " +
                CrimeTable.Cols.TITLE + ", "+
                CrimeTable.Cols.DATE + ", " +
                CrimeTable.Cols.SOLVED + ")");


    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

并且AndroidStudio认为这是我的sql语句：

create table crimes(_id integer primary key autoincrement, uuid, uuid, uuid, uuid)

当显然所有四个列名都不同且不是＆＃34; uuid＆＃34;。有什么想法吗？

Answer 1

您将主键定义为整数数据类型，但将其他内容定义为。

public static final class Cols{
      public static final String ID = "_id";
      public static final String UUID = "uuid";
      public static final String TITLE = "title";
      public static final String DATE = "date";
      public static final String SOLVED = "solved";
}

你的db.execSQL应该是这样的（定义列数据类型）

db.execSQL("create table "+ CrimeTable.NAME + "(" +
                CrimeTable.Cols.ID + " integer primary key autoincrement, " +
                CrimeTable.Cols.UUID + " text, " +
                CrimeTable.Cols.TITLE + " text, "+
                CrimeTable.Cols.DATE + " text, " +
                CrimeTable.Cols.SOLVED + " text)");