当我在房间中迁移数据库时，它显示错误

Question

我正在将Room db从版本2迁移到版本3，但显示错误

原因：java.lang.IllegalStateException：迁移未正确处理user_info_job（com.nsas.bharatnext.DataBase.JobUserInfoTable）。      预期：

TableInfo {name ='user_info_job'，列= {sl_no = Column {name ='sl_no'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_PIN_code = Column {name ='user_PIN_code'，类型='TEXT'，亲和力='2'，notNull = false，primaryKeyPosition = 0}，user_email = Column {name ='user_email'，类型='TEXT'，亲和力='2'，notNull = false，primaryKeyPosition = 0}，user_door_no = Column {name ='user_door_no'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_name = Column {name ='user_name'，type = 'TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_diploma = Column {name ='user_diploma'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}， id_val = Column {name ='id_val'，type ='INTEGER'，affinity ='3'，notNull = true，primaryKeyPosition = 1}，user_specialisation = Column {name ='user_specialisation'，type ='TEXT'，affinity =' 2'，notNull = false，primaryKeyPosition = 0}，user_city = Column {name ='user_city'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_gender = Column {name =' ü ser_gender'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_date_of_birth = Column {name ='user_date_of_birth'，type ='TEXT'，affinity ='2'，notNull = false， primaryKeyPosition = 0}，user_marital_status = Column {name ='user_marital_status'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_ward = Column {name ='user_ward'，type ='TEXT '，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_state = Column {name ='user_state'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_educational_qualification =列{name ='user_educational_qualification'，类型='TEXT'，相似性='2'，notNull = false，primaryKeyPosition = 0}，user_mobile_num =列{name ='user_mobile_num'，类型='TEXT'，相似性='2' ，notNull = false，primaryKeyPosition = 0}，user_course = Column {name ='user_course'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_12th = Column {name ='user_12th' ，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_locality = Column {nam e ='user_locality'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_sub_city = Column {name ='user_sub_city'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_street_name = Column {name ='user_street_name'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_caste = Column {name ='user_caste'，类型='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}，user_10th = Column {name ='user_10th'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0} ，job_sl_no = Column {name ='job_sl_no'，type ='TEXT'，affinity ='2'，notNull = false，primaryKeyPosition = 0}}，外键= []，索引= []}

@Database（实体= {UserInfoTable.class，JobUserInfoTable.class，PolicyUserInfoTable.class，WorkForYouTable.class，UserDetailsTable.class}，版本= 3，exportSchema = false） @TypeConverters（{Converter.class}） 公共抽象类MyAppDataBase扩展了RoomDatabase {

public abstract MyDao myDao();

public abstract UserDAO userDAO();

public static MyAppDataBase mInstance;

public static MyAppDataBase getInstance(Context context){
    if(mInstance!=null){
        mInstance= Room.databaseBuilder(context,MyAppDataBase.class,"userdb")
                 .addMigrations(MIGRATION_2_3)
                 .build();
    }
    return mInstance;
}

public static final Migration MIGRATION_1_2 = new Migration(1, 2) {
    @Override
    public void migrate(@NonNull SupportSQLiteDatabase database) {
        database.execSQL(
                "CREATE TABLE work_for_you_info (state TEXT, city TEXT, consistency TEXT, PRIMARY KEY(slno))");
    }

};
public static final Migration MIGRATION_2_3 = new Migration(2, 3) {
    @Override
    public void migrate(@NonNull SupportSQLiteDatabase database) {
        database.execSQL("DROP TABLE user_info_job");
        database.execSQL("DROP TABLE user_info_policy");
        database.execSQL("DROP TABLE work_for_you_info");
        database.execSQL(
                "CREATE TABLE user_details (user_sl_no TEXT,name TEXT, email TEXT, mobile_num TEXT," +
                        "date_of_birth TEXT,religion TEXT, caste TEXT, subCaste TEXT," +
                        "occupation TEXT,state TEXT, district TEXT, constituency TEXT," +
                        "village TEXT,ward TEXT, gender TEXT, marital_status TEXT," +
                        "door_no TEXT,street_name TEXT, locality TEXT, PIN_code TEXT," +
                        "educational_qualification TEXT,course TEXT, specialisation TEXT, disabled TEXT," +
                        "userRelation TEXT)");
    }

};

}