Room使用遇到的问题

Room数据库升级，增加字段

room升级可以自动配置，官方文档有说明，新版本的库就行，看参考链接。向下面一样配置

is_my_attention是新添加的字段，配置完build一下，报如下的错：
/Users/zhongyili/work/AndroidStudioProjects/SohuModuleLibrary/sohuPush/src/main/java/com/sohu/sohuvideo/sohupush/data/SocketDatabase.java:26: 错误: New NOT NULL column'is_my_attention' added with no default value specified. Please specify the default value using @ColumnInfo. public abstract class SocketDatabase extends RoomDatabase { ^
意思是没有设置默认值，我们设置一个默认值

再build一下，还报错

这是注解自动生成的代码，居然报错，真是奇葩，也可能是没用对。
不纠结了，改成手动配置升级

升级成功了

Room和kotlin结合使用，升级数据库遇到奇葩问题

采用上面的升级方式，用koltin就有问题，真奇葩

这个怎么回事呀？还是注解自动生成代码出错了，为啥不能生成set方法呢？
后来猜想是不是名字带is导致的，把is删了结果可以了，奇葩吧

还有sqLite是不支持boolean类型的
在migrate（）方法中执行SQL语句新增某字段时，该字段不能为BOOLEAN类型的，需要用 INTEGER 替换，如果不指定默认值，则系统默认为1也就是true，但是在写表Model 实体时，时可以定义Boolean类型的变量的，Room会自己转化为INTEGER。
深坑!! 表里是BOOLEAN类型,但是SQL语句需要用INTEGER

但是room还是可以使用boolean类型的，因为通过注解解析后会自动转换的

升级数据库遇到错误

08-15 12:37:05.291 14342 14669 E AndroidRuntime: java.lang.RuntimeException: Exception while computing database live data.
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.room.RoomTrackingLiveData$1.run(RoomTrackingLiveData.java:92)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at java.lang.Thread.run(Thread.java:919)
08-15 12:37:05.291 14342 14669 E AndroidRuntime: Caused by: java.lang.IllegalStateException: Migration didn't properly handle: session_table(com.sohu.sohuvideo.sohupush.bean.Session).
08-15 12:37:05.291 14342 14669 E AndroidRuntime:  Expected:
08-15 12:37:05.291 14342 14669 E AndroidRuntime: TableInfo{name='session_table', columns={is_my_attention=Column{name='is_my_attention', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='0'}, last_msg_id=Column{name='last_msg_id', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, session_id=Column{name='session_id', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_session_id=Column{name='s_session_id', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_content=Column{name='s_content', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_show_time=Column{name='s_show_time', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_to_uid=Column{name='s_to_uid', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, read_msg_id=Column{name='read_msg_id', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, s_send_time=Column{name='s_send_time', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_msgId=Column{name='s_msgId', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_category=Column{name='s_category', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, unread_count=Column{name='unread_count', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, last_show_time=Column{name='last_show_time', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, s_nick_name=Column{name='s_nick_name', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_local_id=Column{name='s_local_id', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_animation_already_do=Column{name='s_animation_already_do', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='0'}, first_show_time=Column{name='first_show_time', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, s_msgStatus=Column{name='s_msgStatus', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_local_uid=Column{name='s_local_uid', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, user_uid=Column{name='user_uid', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=1, defaultValue='null'}, s_from_uid=Column{name='s_from_uid', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}}, foreignKeys=[], indices=[]}
08-15 12:37:05.291 14342 14669 E AndroidRuntime:  Found:
08-15 12:37:05.291 14342 14669 E AndroidRuntime: TableInfo{name='session_table', columns={is_my_attention=Column{name='is_my_attention', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='0'}, last_msg_id=Column{name='last_msg_id', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, session_id=Column{name='session_id', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_session_id=Column{name='s_session_id', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_content=Column{name='s_content', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_show_time=Column{name='s_show_time', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_to_uid=Column{name='s_to_uid', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, read_msg_id=Column{name='read_msg_id', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, s_send_time=Column{name='s_send_time', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_msgId=Column{name='s_msgId', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_category=Column{name='s_category', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, unread_count=Column{name='unread_count', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, last_show_time=Column{name='last_show_time', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, s_nick_name=Column{name='s_nick_name', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_local_id=Column{name='s_local_id', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, first_show_time=Column{name='first_show_time', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, s_msgStatus=Column{name='s_msgStatus', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, s_local_uid=Column{name='s_local_uid', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}, user_uid=Column{name='user_uid', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=1, defaultValue='null'}, s_from_uid=Column{name='s_from_uid', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0, defaultValue='null'}}, foreignKeys=[], indices=[]}
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.room.RoomOpenHelper.onUpgrade(RoomOpenHelper.java:103)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.onUpgrade(FrameworkSQLiteOpenHelper.java:177)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:417)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:317)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:145)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:106)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.room.RoomDatabase.inTransaction(RoomDatabase.java:476)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.room.RoomDatabase.assertNotSuspendingTransaction(RoomDatabase.java:281)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.room.RoomDatabase.query(RoomDatabase.java:324)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.room.util.DBUtil.query(DBUtil.java:83)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at com.sohu.sohuvideo.sohupush.data.dao.SessionDao_Impl$10.call(SessionDao_Impl.java:1195)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at com.sohu.sohuvideo.sohupush.data.dao.SessionDao_Impl$10.call(SessionDao_Impl.java:1192)
08-15 12:37:05.291 14342 14669 E AndroidRuntime:    at androidx.room.RoomTrackingLiveData$1.run(RoomTrackingLiveData.java:90)

这种情况下msg插入字段的时候，在升级数据库的时候session表也得插入字段

    static final Migration migration_2_3 = new Migration(2, 3) {@Overridepublic void migrate(@NonNull SupportSQLiteDatabase database) {database.execSQL("ALTER TABLE `msg_table` ADD COLUMN `animation_already_do` INTEGER NOT NULL DEFAULT 0");database.execSQL("ALTER TABLE `session_table` ADD COLUMN `s_animation_already_do` INTEGER NOT NULL DEFAULT 0");}};

这个要格外注意，一开始不知道怎么解决这个问题。后来使用自动升级配置，看看自动升级是怎么做的，才知道session中也需要插入字段

奇葩
自动升级生成的配置是

  public void migrate(@NonNull SupportSQLiteDatabase database) {database.execSQL("ALTER TABLE `msg_table` ADD COLUMN `animation_already_do` INTEGER NOT NULL DEFAULT 0");database.execSQL("ALTER TABLE `session_table` ADD COLUMN `s_animation_already_do` INTEGER DEFAULT NULL");}

用这个会报错，测试发现得用

database.execSQL("ALTER TABLE `session_table` ADD COLUMN `s_animation_already_do` INTEGER DEFAULT 0");

允许为空，而且默认值得是0

参考

android Room数据库新增BOOLEAN类型的坑
迁移 Room 数据库
将数据保存到本地数据库

Room使用遇到的问题

Room数据库升级，增加字段

Room和kotlin结合使用，升级数据库遇到奇葩问题

升级数据库遇到错误

参考

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