我正在尝试升级数据库版本,而在上一版本中,该表在迁移室上创建了唯一索引,因此出现以下错误

预期:

TableInfo{name='ALERT_STATUS', columns={resolution_time=Column{name='resolution_time', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, status=Column{name='status', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, id=Column{name='id', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=1}, event_time=Column{name='event_time', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, is_uploaded=Column{name='is_uploaded', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, InvErrorCode=Column{name='InvErrorCode', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, is_fault=Column{name='is_fault', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, FaultDetails=Column{name='FaultDetails', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, code=Column{name='code', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, component=Column{name='component', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0}}, foreignKeys=[], indices=[Index{name='index_ALERT_STATUS_code_event_time', unique=true, columns=[code, event_time]}]}

找到:
TableInfo{name='ALERT_STATUS', columns={resolution_time=Column{name='resolution_time', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, status=Column{name='status', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, id=Column{name='id', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=1}, event_time=Column{name='event_time', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, is_uploaded=Column{name='is_uploaded', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, InvErrorCode=Column{name='InvErrorCode', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, is_fault=Column{name='is_fault', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}, FaultDetails=Column{name='FaultDetails', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0}, code=Column{name='code', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0}, component=Column{name='component', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0}}, foreignKeys=[], indices=[Index{name='code_time', unique=true, columns=[code, event_time]}]}

我尝试删除唯一索引,但迁移工作正常,但使用唯一索引却从未通过

我的数据库实体在下面
    @Entity(tableName = "ALERT_STATUS" , indices = {@Index(value = {"code", "event_time"},
    unique = true)})

  public class AlertStatus implements Serializable{
    @PrimaryKey(autoGenerate = true)
    public Integer id;

    @NonNull
    public String event_time;
    public String resolution_time;

    @NonNull
    public String code;
    public Integer component;
    public int status;
    public int is_fault;
    public String FaultDetails;
    public String InvErrorCode;
    public int is_uploaded;



    }

最佳答案

试试这个对我有用。

  • 创建一个新表,即Holder表,该表将在结构更改之间保存您的数据。
     database.execSQL("CREATE TABLE TABLE_NAME (id INTEGER, column1 varchar(25), column2 varchar(25) , PRIMARY KEY(id))");
    
  • 根据需要创建唯一索引
     database.execSQL("CREATE UNIQUE INDEX IF NOT EXISTS <index-name> ON TABLE_NAME (column1,column2)");
    
  • 关于android - 具有唯一索引的 session 室数据库迁移问题,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/54942888/

    10-09 01:49