我在数据库的第一个版本中具有以下模型:

@Table(name = DBConstants.TABLE_CHATS)
public class Chat extends Model {

    @Column(name = DBConstants.COLUMN_CHATS_CHAT_ID,unique = true,onUniqueConflict = Column.ConflictAction.REPLACE)
    public String chatId;

    @Column(name = DBConstants.COLUMN_CHATS_CHAT_MESSAGE)
    public String chatMessage;

    @Column(name = DBConstants.COLUMN_CHATS_SENDER_NAME)
    public String chatSenderName;

    @Column(name = DBConstants.COLUMN_JOBS_JOB_ID)
    public String chatJobId;

    public Chat(){super();}

    public Chat(String chatId, String chatMessage, String chatSenderName, String chatJobId){
        super();
        this.chatId = chatId;
        this.chatMessage = chatMessage;
        this.chatSenderName =chatSenderName;
        this.chatJobId = chatJobId;
    }

    public static List<Chat> getChats(String jobId) {
        return new Select()
                .from(Chat.class)
                .where("jobId=?",jobId)
                .execute();
    }
}


现在,我想用新列更新上述模型,因此我用新列更新了模型类,如下所示。

@Table(name = DBConstants.TABLE_CHATS)
public class Chat extends Model {

    @Column(name = DBConstants.COLUMN_CHATS_CHAT_ID,unique = true,onUniqueConflict = Column.ConflictAction.REPLACE)
    public String chatId;

    @Column(name = DBConstants.COLUMN_CHATS_CHAT_MESSAGE)
    public String chatMessage;

    @Column(name = DBConstants.COLUMN_CHATS_SENDER_NAME)
    public String chatSenderName;

    @Column(name = DBConstants.COLUMN_JOBS_JOB_ID)
    public String chatJobId;

    @Column(name = "extra_column")
    public String extraColumn;

    public Chat(){super();}

    public Chat(String chatId, String chatMessage, String chatSenderName, String chatJobId,String extraColumn){
        super();
        this.chatId = chatId;
        this.chatMessage = chatMessage;
        this.chatSenderName =chatSenderName;
        this.chatJobId = chatJobId;
        this.extraColumn = extraColumn;
    }

    public static List<Chat> getChats(String jobId) {
        return new Select()
                .from(Chat.class)
                .where("jobId=?",jobId)
                .execute();
    }
}


我将Active android用于数据库,所以我完成了以下步骤:

1.更新清单文件中的数据库版本号

<meta-data android:name="GC_DB_VERSION" android:value="4" />


2.在资产/迁移中添加了4.sql脚本文件

3.在其中添加了更新查询。

ALTER TABLE chat ADD COLUMN extra_column TEXT;



现在,当我尝试将新的列值插入数据库时​​,出现以下错误:



  android.database.sqlite.SQLiteException:表聊天没有列
  命名为extra_column(代码1):,而在编译时:INSERT INTO
  聊天(chat_message,Id,extra_column,chat_sender_name,jobId,chatId)
  值(?,?,?,?,?,?)
      10-16 06:54:29.712 16791-16791 / com.example.manikanta.navigationdrawerpattern
  E / SQLiteDatabase:位于
  android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native
  方法)
      10-16 06:54:29.712 16791-16791 / com.example.manikanta.navigationdrawerpattern
  E / SQLiteDatabase:位于
  android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)
      10-16 06:54:29.712 16791-16791 / com.example.manikanta.navigationdrawerpattern
  E / SQLiteDatabase:位于
  android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493)
      10-16 06:54:29.712 16791-16791 / com.example.manikanta.navigationdrawerpattern
  E / SQLiteDatabase:位于
  android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
      10-16 06:54:29.712 16791-16791 / com.example.manikanta.navigationdrawerpattern
      .......
      10-16 06:54:29.712 16791-16791 / com.example.manikanta.navigationdrawerpattern E / SQLiteLog:
  (1)表聊天中没有名为extra_column的列


谁能解释如何解决这个问题?

最佳答案

我已经解决了。

问题原因:

更改清单文件中的版本号时,不会调用活动android的迁移脚本

解决方法:

我已经通过Application.class通过以下行手动设置了数据库版本的更改:

Configuration configuration = new Configuration.Builder(this).setDatabaseVersion(13).create();

        ActiveAndroid.initialize(configuration);


我不知道这是否正确,任何更好的方法都值得赞赏。

07-24 09:26