\n@Database\ub77c\ub294 \uc560\ub178\ud14c\uc774\uc158\uc744 \ud074\ub798\uc2a4\uc5d0 \ub2ec\uc544\uc57c \ud558\uba70,\u00a0 \ub2e4\uc74c\uacfc \uac19\uc740 \uc870\uac74\uc744 \ub9cc\uc871\ud574\uc57c\ud55c\ub2e4.<\/p>\n
- \n
- RoomDatabase\ub97c \uc0c1\uc18d\ud574\uc57c\ud55c abstract class\uc5ec\uc57c \ud55c\ub2e4.<\/li>\n
- \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc640 \uad00\ub828\ub41c \uc5d4\ud2f0\ud2f0\ub4e4\uc744 \uc560\ub178\ud14c\uc774\uc158\uc758 \uc778\uc790\uac12\uc73c\ub85c \ud3ec\ud568\ud574\uc57c\ud55c\ub2e4.<\/li>\n
- abstract method \ud3ec\ud568\ud574\uc57c\ud558\ub294\ub370, \uc774 \uba54\uc18c\ub4dc\uc5d0\ub294 \uc778\uc790\uac00 0\uac1c\uc774\uace0 return \ub418\ub294\ud074\ub798\uc2a4\uac00\u00a0@Dao \uc560\ub178\ud14c\uc774\uc158\uc744 \ub2ec\uace0 \uc788\uc5b4\uc57c\ud55c\ub2e4.<\/li>\n<\/ul>\n
\ub7f0\ud0c0\uc784\ub54c\uc5d0\ub294 Room.databaseBuilder() \ub610\ub294 Room.inMemoryDatabaseBuilder()\ub97c \ud1b5\ud574 Database\uc758 \uac1d\uccb4\ub97c \uc5bb\uc5b4 \ub0bc \uc218 \uc788\ub2e4.<\/li>\n
- Entity : \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \ud14c\uc774\ube14\uc744 \ud45c\ud604\ud55c\ub2e4<\/li>\n
- DAO : \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0 \uc811\uc18d\ud558\uae30 \uc704\ud55c \uba54\uc18c\ub4dc\ub97c \ud3ec\ud568\ud55c\ub2e4.<\/li>\n<\/ul>\n
\uc704\uc758 \uad6c\uc131\uc694\uc18c\uc640 \ub2e4\ub978 \uc571\ub4e4\uacfc\uc758 \uad00\uacc4\ub294 \uc544\ub798\uc758 \uadf8\ub9bc\uc5d0\uc11c \ud655\uc778 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.
\n![](\"http:\/\/wiki.navercorp.com\/download\/attachments\/387475051\/image.png?version=3&modificationDate=1529388044491&api=v2\" "\\"Group")
\n\ud558\ub098\uc758 \uc5d4\ud2f0\ud2f0\uc640 \ud558\ub098\uc758 DAO\ub97c \uac16\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ud658\uacbd\uc124\uc815\uc5d0 \ub300\ud55c \uc0d8\ud50c \ucf54\ub4dc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.
\nUser.java<\/strong><\/p>\n\n\n
\n \n @Entity\npublic class User {\n @PrimaryKey\n private int uid;\n @ColumnInfo(name = \"first_name\")\n private String firstName;\n @ColumnInfo(name = \"last_name\")\n private String lastName;\n \/\/ \uc911\uc694: getter\uc640 setter\ub294 \uac04\ub7b5\ud558\uac8c \uc791\uc131\ud558\uae30 \uc704\ud574 \uc5ec\uae30\uc11c\ub294 \uc0dd\ub7b5\ub418\uc5c8\uc9c0\ub9cc Room\uacfc \ud568\uaed8 \uc4f0\uc774\uae30 \uc704\ud574\uc11c\ub294 \ubc18\ub4dc\uc2dc \ud3ec\ud568\ud558\uc5ec\uc57c \ud569\ub2c8\ub2e4.\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nUserDao.java<\/strong><\/p>\n
\n\n
\n \n @Dao\npublic interface UserDao {\n @Query(\"SELECT * FROM user\")\n List<User> getAll();\n @Query(\"SELECT * FROM user WHERE uid IN (:userIds)\")\n List<User> loadAllByIds(int[] userIds);\n @Query(\"SELECT * FROM user WHERE first_name LIKE :first AND \"\n + \"last_name LIKE :last LIMIT 1\")\n User findByName(String first, String last);\n @Insert\n void insertAll(User... users);\n @Delete\n void delete(User user);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nAppDatabase.java<\/strong><\/p>\n
\n\n
\n \n @Database(entities = {User.class}, version = 1)\npublic abstract class AppDatabase extends RoomDatabase {\n public abstract UserDao userDao();\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uc704\uc640 \uac19\uc740 \ud074\ub798\uc2a4 \ud30c\uc77c\uc744 \ub9cc\ub4e4\uace0 \ub09c\ub4a4\uc5d0 \uc544\ub798\uc758 \ucf54\ub4dc\ub97c \ud1b5\ud574 \ub370\uc774\ud130 \ubca0\uc774\uc2a4\ub97c \uc0dd\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n AppDatabase db = Room.databaseBuilder(getApplicationContext(),\n AppDatabase.class, \"database-name\").build();<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n
\n \n<\/colgroup>\n \n Note : RoomDatabase\uac1d\uccb4\ub97c \uc778\uc2a4\ud134\uc2a4\ud654 \ud558\ub294 \ube44\uc6a9\uc740 \ub9e4\uc6b0 \ud06c\ubbc0\ub85c \uac1c\ubc1c\uc790\ub294 \uc774 AppDatabase\uac1d\uccb4\ub97c \uc5bb\ub294 \uc791\uc5c5\uc744 \uc2f1\uae00\ud1a4\ud328\ud134\uc73c\ub85c \ub9cc\ub4e4\uae30\ub97c \uad8c\uc7a5\ud569\ub2c8\ub2e4.<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n Room Entity\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub370\uc774\ud130 \uad6c\uc870 \uc815\uc758\ud558\uae30<\/h2>\n
Room \uc0ac\uc6a9\uc2dc Entity\ub97c \uc0ac\uc804\uc5d0 \uc815\uc758\ud574\uc57c\ud558\ub294\ub370, \uac01\uac00\uc758 \uc5d4\ud2f0\ud2f0 \ubcc4\ub85c \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c\ub294 \ud14c\uc774\ube14\uc774 \uc0dd\uc131\ub418\uc5b4 \uc544\uc774\ud15c\ub4e4\uc744 \ubcf4\uad00\ud560 \uc218 \uc788\uac8c \ub429\ub2c8\ub2e4.
\n\uae30\ubcf8\uc801\uc73c\ub85c Room\uc740 Entity\uc5d0 \uc815\uc758\ub41c \ud544\ub4dc\uc5d0\ub9de\ucdb0 \uceec\ub7fc\uc744 \uad6c\uc131\ud558\uac8c \ub429\ub2c8\ub2e4. \ub9cc\uc57d Entity\ub97c \uc704\ud574 \uc791\uc131\ub41c Data \ud074\ub798\uc2a4\uc5d0\uc11c \uc5b4\ub5a0\ud55c \ubcc0\uc218\ub97c \uc120\uc5b8\ud588\uace0 \uc774\uac83\uc774 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0\uc11c \uceec\ub7fc\uc73c\ub85c \uc0dd\uc131\ub418\uae30\ub97c \uc6d0\uce58 \uc54a\ub294\ub2e4\uba74\u00a0@Ignore \uc560\ub178\ud14c\uc774\uc158\uc744 \uc774\uc6a9\ud558\uba74 \ub429\ub2c8\ub2e4.
\n\uc0d8\ud50c \ucf54\ub4dc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n
\n \n @Entity\npublic class User {\n @PrimaryKey\n public int id;\n public String firstName;\n public String lastName;\n @Ignore\n Bitmap picture;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nRoom\uc774 \ud544\ub4dc\uc5d0 \uc811\uadfc\ud558\uae30 \uc704\ud574\uc11c \ubc18\ub4dc\uc2dc public \ub610\ub294 getter setter\ub97c \ub9cc\ub4e4\uc5b4\uc57c \ud569\ub2c8\ub2e4. \ub9cc\uc57d getter, setter \uba54\uc18c\ub4dc\ub97c \uc0ac\uc6a9\ud55c\ub2e4\uba74 \uba85\uc2ec\ud574\uc57c\ud560 \uac83\uc774 \ud558\ub098 \uc788\uc2b5\ub2c8\ub2e4. getter setter\ub294 JavaBeans\ucee8\ubca4\uc158\uc744 \uae30\ubc18\uc73c\ub85c \ud569\ub2c8\ub2e4.<\/p>\n
\n
\n \n<\/colgroup>\n \n Note:Entity\ub4e4\uc740 \ube48 \uc0dd\uc131\uc790(\ud574\ub2f9 DAO \ud074\ub798\uc2a4\uac00 \uac01 \ud544\ub4dc\uc5d0 \uc561\uc138\uc2a4 \ud560 \uc218 \uc788\ub294\uacbd\uc6b0) \ub610\ub294 \ub9e4\uac1c\ubcc0\uc218\uac00 \uc5d4\ud2f0\ud2f0\uc758 \ud544\ub4dc\uc640 \uc720\ud615 \ubc0f \uc774\ub984\uc774 \uc77c\uce58\ud558\ub294 \uc0dd\uc131\uc790\ub97c \ud3ec\ud568 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. Room\uc740 \ub610\ud55c \uc804\uccb4 \ub610\ub294 \uba87\uba87 \ud544\ub4dc\ub9cc\uc744 \ub9e4\uac1c\ubcc0\uc218\ub85c \ubc1b\ub294 \uc0dd\uc131\uc790\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n \uae30\ubcf8\ud0a4 \uc0ac\uc6a9\ud558\uae30<\/h2>\n
\uac01 \uc5d4\ud2f0\ud2f0\ub294 \ubc18\ub4dc\uc2dc \ud55c\uac1c\uc758 \ud544\ub4dc\ub97c \uae30\ubcf8\ud0a4\ub85c \uc815\uc758 \ud574\uc57c\ud569\ub2c8\ub2e4. \uc2ec\uc9c0\uc5b4 \ud544\ub4dc\uac00 \ud55c\uac1c\ubc16\uc5d0 \uc5c6\ub354\ub77c\ub3c4 \ubc18\ub4dc\uc2dc\u00a0@PrimaryKey \uc560\ub178\ud14c\uc774\uc158\uc744 \ubd99\uc5ec\uc11c \uae30\ubcf8\ud0a4\ub85c \uc815\uc758\ub97c \ud574\uc57c \ud569\ub2c8\ub2e4. \ub610\ud55c \ub9cc\uc57d\uc5d0 ID\uc640 \uac19\uc740 \uae30\ubcf8\ud0a4\uac12\uc744 \uc790\ub3d9\uc73c\ub85c \uc9c0\uc815\ud558\uace0 \uc2f6\ub2e4\uba74, \uc608\ub97c \ub4e4\uba74 Auto Increment\uac19\uc740.., @PrimaryKey\uc758 \uc18d\uc131\uac12\uc73c\ub85c\u00a0autoGenerate\ub97c true\ub85c \uc9c0\uc815\ud574\uc8fc\uba74 \ub429\ub2c8\ub2e4.
\n\ucf54\ub4dc\ub97c \ubcf4\ub3c4\ub85d\ud558\uc8e0.<\/p>\n\n\n
\n \n @Entity(primaryKeys = {\"firstName\", \"lastName\"})\npublic class User {\n public String firstName;\n public String lastName;\n @Ignore\n Bitmap picture;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uae30\ubcf8\uc801\uc73c\ub85c Room\uc740 \ud074\ub798\uc2a4\uc774\ub984\uc744 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \ud14c\uc774\ube14\uba85\uc73c\ub85c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uadfc\ub370 \ub9cc\uc57d\uc5d0 \ub2e4\ub978 \uc774\ub984\uc744 \uc4f0\uace0 \uc2f6\ub2e4\uba74 \uc544\ub798\uc640 \uac19\uc774 tableName\uc18d\uc131\uc744 \uc9c0\uc815\ud558\uba74\ub429\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Entity(tableName = \"users\")\npublic class User {\n ...\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n
\n \n<\/colgroup>\n \n Caution:SQLite\uc5d0\uc11c\ub294 \ub300\uc18c\ubb38\uc790\ub97c \uad6c\ubd84\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n tableName\uacfc \ube44\uc2b7\ud558\uac8c, Room \uc740 \ud544\ub4dc\uba85 \ub610\ud55c \ub2e4\ub974\uac8c \uc9c0\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\u00a0@ColumnInfo \uc560\ub178\ud14c\uc774\uc158\uc744 \uc774\uc6a9\ud574\uc11c \ub9d0\uc774\uc8e0. \uc544\ub798\uc640 \uac19\uc774 \uc0ac\uc6a9\ud558\uba74 \ub429\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Entity(tableName = \"users\")\npublic class User {\n @PrimaryKey\n public int id;\n @ColumnInfo(name = \"first_name\")\n public String firstName;\n @ColumnInfo(name = \"last_name\")\n public String lastName;\n @Ignore\n Bitmap picture;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uc778\ub371\uc2a4\uc640 \uace0\uc720\uc131\uc5d0 \ub300\ud574 \uc8fc\uc11d\ub2ec\uae30(Annotate indices and uniqueness)<\/h2>\n
\uc5b4\ub5bb\uac8c data\uc5d0 \uc811\uadfc\ud558\ub0d0\uc5d0 \ub530\ub77c, \ucffc\ub9ac\uc758 \uc18d\ub3c4\ub97c \ub192\uc774\uae30 \uc704\ud574 \uc5b4\ub5a4\ud544\ub4dc\ub97c \uc778\ub371\uc2a4\ud558\uace0 \uc2f6\uc744\uc9c0\ub3c4 \ubaa8\ub978\ub2e4. @Entity\uc560\ub178\ud14c\uc774\uc158\uc758 \uc18d\uc131\uc73c\ub85c\u00a0indices\ub97c \uc0ac\uc6a9\ud55c\ub2e4\uba74 \uc5d4\ud2f0\ud2f0\ub97c \uc778\ub371\uc2a4 \ud560 \uc218 \uc788\ub2e4. column\uc774\ub984\uc758 \ubaa9\ub85d\uc744 \uc801\uae30\ub9cc \ud558\uba74\ub41c\ub2e4. \uc0d8\ud50c \ucf54\ub4dc\ub97c \ud655\uc778\ud574\ubcf4\uc790<\/p>\n
\n\n
\n \n @Entity(indices = {@Index(\"firstName\"),\n @Index(value = {\"last_name\", \"address\"})})\npublic class User {\n @PrimaryKey\n public int id;\n public String firstName;\n public String address;\n @ColumnInfo(name = \"last_name\")\n public String lastName;\n @Ignore\n Bitmap picture;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\ub54c\ub85c\ub294 \uc5b4\ub5a4 \ud544\ub4dc\ub098 \ud544\ub4dc\uc758 \uadf8\ub8f9\uc744 \uace0\uc720\ud558\uac8c \ub9cc\ub4e4\uc5b4\uc57c \ud560 \ub54c\uac00 \uc788\ub2e4. \uac15\uc81c\ub85c \uace0\uc720\uc131\uc744 \ubd80\uc5ec\ud560\uc218\ub3c4 \uc788\ub294\ub370 \ubc14\ub85c unique \uc18d\uc131\uc774\ub2e4. \uc778\ub371\uc2a4 \uc560\ub178\ud14c\uc774\uc158\uacfc \uac19\uc774 \uc4f0\uc774\uba70 true\ub85c \uc9c0\uc815\ud558\uae30\ub9cc \ud558\uba74\ub41c\ub2e4. \ub2e4\uc74c \uc544\ub798\uc5d0 \ub098\uc624\ub294 \ucf54\ub4dc\uc5d0\uc11c\ub294 firstName\uacfc lastName\uceec\ub7fc\uc5d0 \ub300\ud558\uc5ec \ud14c\uc774\ube14\uc774 \ub450\uac1c \uc774\uc0c1\uc758 \uac19\uc740 \ud589\uc774 \uae30\ub85d\ub418\uc9c0 \uc54a\ub3c4\ub85d \ubc29\uc9c0 \ud558\uace0 \uc788\ub2e4.<\/p>\n
\n\n
\n \n @Entity(indices = {@Index(value = {\"first_name\", \"last_name\"},\n unique = true)})\npublic class User {\n @PrimaryKey\n public int id;\n @ColumnInfo(name = \"first_name\")\n public String firstName;\n @ColumnInfo(name = \"last_name\")\n public String lastName;\n @Ignore\n Bitmap picture;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uac1d\uccb4\uac04\uc758 \uad00\uacc4 \uc815\uc758 \ud558\uae30<\/h2>\n
SQLite\ub294 \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc774\uae30 \ub54c\ubb38\uc5d0 \uac1d\uccb4\uac04\uc758 \uad00\uacc4\ub3c4 \uc9c0\uc815\uac00\ub2a5\ud558\ub2e4. \ube44\ub85d \ub300\ubd80\ubd84\uc758 \uad00\uacc4\ud615 \uc624\ube0c\uc7ad\ud2b8 \ub9e4\ud551 \ub77c\uc774\ube0c\ub7ec\ub9ac\ub4e4\uc740 \uc5d4\ud2f0\ud2f0\uac00 \ub2e4\ub978 \uac83\ub4e4\uc744 \ucc38\uc870\ud558\ub3c4\ub85d \ud558\uc9c0\ub9cc Room \ubd84\uba85\ud558\uac8c \uc774\uac83\uc744 \uae08\uc9c0\ud558\uace0 \uc788\ub2e4.
\n\uc774\uc5d0 \ub300\ud55c \uc774\uc720\ub97c \uc54c\uace0 \uc2f6\ub2e4\uba74 \ub9c1\ud06c<\/a>\ub97c \ucc38\uc870\ud558\ub3c4\ub85d \ud558\uc790.
\n\ube44\ub85d \uc9c1\uc811\uc801\uc73c\ub85c \uad00\uacc4\ub97c \ub9fa\uc744\uc218\ub294 \uc5c6\uc9c0\ub9cc, Room\uc740 \uc5ec\uc804\ud788 \uc5d4\ud2f0\ud2f0\uac04\uc5d0 \uc678\ubd80\ud0a4\ub97c \uc815\uc758\ud558\ub294\uac83\uc744 \ud5c8\uc6a9\ud558\uace0 \uc788\ub2e4.
\n\uc608\ub97c\ub4e4\uba74 Book\uc774\ub77c\ub294 \uc5d4\ud2f0\ud2f0\uac00 \uc788\uace0 User\ub77c\ub294 \uc5d4\ud2f0\ud2f0\uc640 \uad00\uacc4\ub97c \ub9fa\uace0 \uc2f6\ub2e4\uba74\u00a0@ForeignKey \uc560\ub178\ud14c\uc774\uc158\uc744 \ud1b5\ud574 \uc544\ub798\uc640\uac19\uc774 \uc815\uc758 \ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n
\n \n @Entity(foreignKeys = @ForeignKey(entity = User.class,\n parentColumns = \"id\",\n childColumns = \"user_id\"))\npublic class Book {\n @PrimaryKey\n public int bookId;\n public String title;\n @ColumnInfo(name = \"user_id\")\n public int userId;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uc678\ubd80\ud0a4\ub294 \ub9e4\uc6b0 \uac15\ub825\ud558\ub2e4. \ucc38\uc870\ud55c \uc5d4\ud2f0\ud2f0\uac00 \uc5c5\ub370\uc774\ud2b8 \ub420\ub54c \uc5b4\ub5a4\uc77c\uc774 \ubc1c\uc0dd\ud588\ub294\uc9c0 \uba85\uc2dc\ud558\ub294\uac83\uc744 \ud5c8\uc6a9\ud558\uace0 \uc788\ub2e4.
\n\uc608\ub97c\ub4e4\uba74\u00a0@ForeignKey(onDelete=CASCADE) \uc560\ub178\ud14c\uc774\uc158\uc744 \uac00\uc9c0\uace0 \uc788\ub294 \uc5b4\ub5a4 User\uac1d\uccb4\uac00 \uc0ad\uc81c\ub41c\ub2e4\uba74 \ubaa8\ub4e0 \ud574\ub2f9 \uc720\uc838\uc758 \ubaa8\ub4e0 \ucc45\uc744 \uc0ad\uc81c\ud574\ub77c \ub77c\ub294 \uba85\ub839\uc744 SQLite\uc5d0\uac8c \uc904\uc218\ub3c4 \uc788\ub2e4.<\/p>\n\n
\n \n<\/colgroup>\n \n Note:SQLite\ub294 @Insert(onConflict = REPLACE)\ub97c \ud558\ub098\uc758 UPDATE \uc5f0\uc0b0\uc790 \ub300\uc2e0\uc5d0 REMOVE \uc640 REPLACE \uc5f0\uc0b0\uc790\ub4e4\uc758 \ubb36\uc74c\uc73c\ub85c \ub2e4\ub8ec\ub2e4. \uc911\ubcf5\uad50\uccb4\ub97c \ud558\ub294 \uc774 \uba54\uc18c\ub4dc\ub294 \uc678\ubd80\ud0a4 \uc81c\uc57d\uc0ac\ud56d\uc5d0 \uc601\ud5a5\uc744 \ucd9c\uc218\ub3c4 \uc788\ub2e4. \uc790\uc138\ud55c \uc0ac\ud56d\uc740 SQLite Documentation<\/a>\uc758 ON_CONFLICT \ud56d\ubaa9\uc744 \ud655\uc778\ud558\ub3c4\ub85d \ud558\uc790.<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n \ub610 \ub2e4\ub978 \uc5d4\ud2f0\ud2f0\ub97c \ub0b4\ud3ec\ud558\ub294 \uc624\ube0c\uc81d\ud2b8 \ub9cc\ub4e4\uae30(Create nested objects)<\/h2>\n
\ub54c\ub85c\ub294 \uc5ec\ub7ec \ud544\ub4dc\ub97c \ud3ec\ud568\ud558\uace0 \uc788\ub294 \uc5b4\ub5a0\ud55c \uac1d\uccb4\ub97c POJO\ub098 Entity\ub97c \ud1b5\ud574 \ud45c\ud604\ud558\uace0 \uc2f6\uc744\ub54c\uac00 \uc788\ub2e4. \uc774\ub7f0\uacbd\uc6b0\uc5d0\ub294\u00a0@Embeded \uc560\ub178\ud14c\uc774\uc158\uc744 \uc0ac\uc6a9\ud558\uc5ec \ud14c\uc774\ube14 \ub0b4\uc758 \ud558\uc704 \ud544\ub4dc\ub85c \ubd84\ud574 \ud560 \uac1d\uccb4\ub97c \ub098\ud0c0\ub0bc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub7f0 \ub2e4\uc74c \ub2e4\ub978 \uac01\uac00\uc758 \uceec\ub7fc\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c \ud3ec\ud568\ub41c \ud544\ub4dc\ub97c \ucffc\ub9ac \ud560 \uc218 \uc788\ub2e4. \u00a0\ub9d0\uc774 \uc5b4\ub824\uc6b4\ub370 \uadf8\ub0e5 \uc608\uc81c\ub97c \ubcf4\ub294\ud3b8\uc774 \ub354 \uc26c\uc6b8\ub54c\ub3c4 \uc788\ub2e4.<\/p>\n
\n\n
\n \n public class Address {\n public String street;\n public String state;\n public String city;\n @ColumnInfo(name = \"post_code\")\n public int postCode;\n}\n@Entity\npublic class User {\n @PrimaryKey\n public int id;\n public String firstName;\n @Embedded\n public Address address;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uacb0\uacfc\uc801\uc73c\ub85c User \ud14c\uc774\ube14\uc740 id, firstName, street, state, city, post_code\ub97c \ub2e4 \ud3ec\ud568\ud558\uc5ec\uc11c \ud45c\ud604\ud55c\ub2e4.<\/p>\n
\n
\n \n<\/colgroup>\n \n Note:Embeded \ud544\ub4dc\ub294 \ub610 \ub2e4\ub978 Embeded\ud544\ub4dc\ub97c \ud3ec\ud568\ud560 \uc218 \uc788\ub2e4.<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n \ub9cc\uc57d \uc5d4\ud2f0\ud2f0\uac00 \uac19\uc740\uc790\ub8cc\ud615\uc758 \uc5ec\ub7ec \uc784\ubca0\ub514\ub4dc \ud544\ub4dc\ub97c \uac16\ub294\ub2e4\uba74, prefix\uc18d\uc131\uc744 \ud1b5\ud574 \uac01 \uceec\ub7fc\uc774 \uace0\uc720\ud558\ub3c4\ub85d \ud560 \uc218 \uc788\ub2e4.\u00a0\uadf8\ub7f0 \ub2e4\uc74c \uc81c\uacf5\ub41c \uac12\uc744 \ud3ec\ud568 \ub41c \uac1c\uccb4\uc758 \uac01 \uceec\ub7fc \uc774\ub984 \uc2dc\uc791 \ubd80\ubd84\uc5d0 \ucd94\uac00\ud569\ub2c8\ub2e4.<\/p>\n
Room\uc758 DAO\ub4e4\uc744 \uc774\uc6a9\ud558\uc5ec data\uc5d0 \uc811\uadfc\ud558\uae30<\/h2>\n
Room\uc744 \ud1b5\ud574 database\uc5d0 \uc788\ub294 \ub370\uc774\ud130\ub97c \uc0ac\uc6a9\ud558\uae30 \uc704\ud574\uc11c\ub294 \u00a0\uc811\uadfc\ud558\ub824\uba74 DAO\uac00 \ud544\uc694\ud558\ub2e4. DAO\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0 \ucd94\uc0c1\uc801\uc778 \uc811\uadfc\uc744 \uc81c\uacf5\ud558\ub294 \uba54\uc18c\ub4dc\ub4e4\uc744 \ud3ec\ud568\ud55c\ub2e4.
\n\uc9c8\uc758\ub97c \ub9cc\ub4dc\ub294 \ube4c\ub354\ub098 \uc9c1\uc811\uc801\uc778 \ucffc\ub9ac\ub97c \uc791\uc131\ud558\ub294 \uac83 \ub300\uc2e0, DAO\ud074\ub798\uc2a4\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0 \uc811\uadfc\ud558\ub294\uac83\uc740 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uad6c\uc870\uc758 \uad6c\uc131\uc694\uc18c\ub97c \ubd84\ub9ac \ud55c\ub2e4. \ub354\ub098\uc544\uac00 DAO\ub294 \uc27d\uac8c \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub97c \ubaa8\ud0b9(Mock)\ud558\uc5ec \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ud14c\uc2a4\ud2b8\ud558\uae30 \uc27d\uac8c \ud55c\ub2e4.
\n\ud558\ub098\uc758 DAO\ub294 interface\ub098 abstract class\uac00 \ub418\uc57c \ud55c\ub2e4. \ub9cc\uc57d abstract class\ub85c \ub9cc\ub4e4\uc5c8\ub530\uba74 \uc120\ud0dd\uc801\uc73c\ub85c RoomDatabase\uac1d\uccb4\ub97c \uc0dd\uc131\uc790\uc758 \ub9e4\uac1c\ubcc0\uc218\ub85c \uac00\uc9c8\uc218 \uc788\uc73c\uba70. Room \uc740 \uac01 DAO\uc758 \uad6c\ud604\uc744 \ucef4\ud30c\uc77c \uc2dc\uac04\uc5d0 \uc0dd\uc131\ud574\ub0b8\ub2e4.<\/p>\n\n
\n \n<\/colgroup>\n \n Note:Room\uc740 \uba54\uc778\uc4f0\ub808\ub4dc\uc5d0\uc11c\uc758 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc811\uadfc\uc744 \ud5c8\uc6a9\ud558\uc9c0 \uc54a\ub294\ub2e4. \ud5c8\uc6a9\ud558\uace0 \uc2f6\ub2e4\uba74 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub97c \uc0dd\uc131\ud558\ub294 \ube4c\ub354\uc5d0\uc11c allowMainThreadQueries()\ub97c \ud638\ucd9c\ud574\uc57c\ud55c\ub2e4. \ud5c8\uc6a9\ud558\uc9c0 \uc54a\ub294 \uc774\uc720\ub294 \ub370\uc774\ud130\ub97c \ubc1b\uc544\uc624\ub294 \uc791\uc5c5\uc774 \uae38\uc5b4\uc9c8 \uacbd\uc6b0 UI\uac00 \uc7a5\uc2dc\uac04 \uba48\ucdb0\ubc84\ub9b4\uc218 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4. \uadf8\ub798\uc11c \ubcf4\ud1b5 \ube44\ub3d9\uae30 \ucffc\ub9ac\ub97c \ud558\uac8c \ub418\ub294\ub370 \ubc18\ud658\uac12\uc73c\ub85c\ub294 LiveData \ub610\ub294 RxJava\uc758 Flowable\uc774 \ub420 \uc218\ub3c4 \uc788\ub2e4.<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n \ud3b8\uc758\uc131\uc744 \uc704\ud55c \uba54\uc18c\ub4dc \uc815\uc758\ud558\uae30<\/h2>\n
DAO\ub97c \uc774\uc6a9\ud55c \uc5ec\ub7ec \ud3b8\ub9ac\ud55c \ucffc\ub9ac\ub4e4\uc774 \uc788\ub294\ub370 \uba87\uba87 \uac00\uc9c0 \uc608\ub9cc \ub2e4\ub8e8\uc5b4 \ubcf4\ub3c4\ub85d \ud558\uaca0\ub2e4.<\/p>\n
Insert<\/h3>\n
DAO\uba54\uc18c\ub4dc\ub97c \ub9cc\ub4e4\ub54c\u00a0@Insert\ub97c \ub2ec\uc544\uc904\uc218 \uc788\ub2e4. Room\uc740 \uc774\uc640 \uad00\ub828\ub41c \ucf54\ub4dc\ub97c \uc0dd\uc131\ud574\ub0b4\uace0 \ubaa8\ub4e0 \ud30c\ub77c\ubbf8\ud130\ub97c \ud558\ub098\uc758 \ud2b8\ub79c\uc7ad\uc158\ub0b4\uc5d0\uc11c \uc0bd\uc785(insert)\ud558\uac8c \ub41c\ub2e4.
\n\ucf54\ub4dc\ub97c \ud655\uc778\ud574\ubcf4\uc790<\/p>\n\n\n
\n \n @Dao\npublic interface MyDao {\n @Insert(onConflict = OnConflictStrategy.REPLACE)\n public void insertUsers(User... users);\n @Insert\n public void insertBothUsers(User user1, User user2);\n @Insert\n public void insertUsersAndFriends(User user, List<User> friends);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\ub9cc\uc57d\u00a0@Insert \uba54\uc18c\ub4dc\uac00 \ud558\ub098\uc758 \ud30c\ub77c\ubbf8\ud130\ub9cc \ubc1b\ub294\ub2e4\uba74, \uc0bd\uc785\ud55c \ub370\uc774\ud130\uc5d0 \ub300\ud55c long\ud615\u00a0rowId\ub97c \ub9ac\ud134 \ubc1b\uc744 \uc218 \uc788\ub2e4. \ub9cc\uc57d \ud30c\ub77c\ubbf8\ud130\uac00 \uc5ec\ub7ec\uac1c\ub77c\uba74 long[] \ub610\ub294 List<Long>\uc73c\ub85c \ub300\uc2e0 \ub9ac\ud134 \ubc1b\uc744 \uc218 \uc788\ub2e4.<\/p>\n
Update<\/h3>\n
Update\ub97c \ud1b5\ud574 \uc8fc\uc5b4\uc9c4 \ud30c\ub77c\ubbf8\ud130\ub85c\ubd80\ud130 \uc5ec\ub7ec \uc5d4\ud2f0\ud2f0\ub4e4\uc744 \uc218\uc815\ud560 \uc218 \uc788\ub2e4. \uc774\ub294 \uac01 \uc5d4\ud2f0\ud2f0\uc758 \uae30\ubcf8\ud0a4\uc5d0 \ub300\ud574 \uc77c\uce58\ud558\ub294 \uacbd\uc6b0 \uc0ac\uc6a9\ub41c\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Update\n public void updateUsers(User... users);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\ubcf4\ud1b5 \ud544\uc694\ud558\uc9c0\ub294 \uc54a\uc9c0\ub9cc, \uc774 \uba54\uc18c\ub4dc\uc758 \ub300\ud55c \ubc18\ud658\ud615\uc740 Int\uc778\ub370, \ubc18\ud658\uac12\uc740 \uc218\uc815\ub41c \ud589\uc758 \uac2f\uc218\ub97c \uc54c\ub824\uc900\ub2e4.<\/p>\n
Delete<\/h3>\n
\uc8fc\uc5b4\uc9c4 \ud30c\ub77c\ubbf8\ud130\ub85c \ubd80\ud130 \uc5d4\ud2f0\ud2f0\ub4e4\uc744 \uc9c0\uc6cc\uc8fc\ub294 \uba54\uc18c\ub4dc. \uc5d4\ud2f0\ud2f0\ub97c \ucc3e\uc544 \uc0ad\uc81c\ud558\uae30 \uc704\ud574\uc11c \uae30\ubcf8\ud0a4\ub97c \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Delete\n public void deleteUsers(User... users);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uc774 \uba54\uc18c\ub4dc \ub610\ud55c \uba87\uac1c\uc758 \ud589\uc774 \uc9c0\uc6cc\uc84c\ub294\uc9c0 int\ud615 \ubc18\ud658\uac12\uc73c\ub85c \uc54c\ub824\uc900\ub2e4.<\/p>\n
Query\ud574\ubcf4\uae30<\/h2>\n
@Query \ub294 DAO \uc5d0\uc11c \uc8fc\uc694\ud55c \uc560\ub178\ud14c\uc774\uc158\uc774\ub2e4. \uc77d\uae30\/\uc4f0\uae30\ub97c \uc774 \uc560\ub178\ud14c\uc774\uc158\uc73c\ub85c \ubaa8\ub450 \uac00\ub2a5\ud558\ub2e4. \uac01\u00a0@Query \uba54\uc18c\ub4dc\ub294 \ucef4\ud30c\uc77c \uc2dc\uac04\uc5d0 \uc54c\ub9de\uc740 \ucffc\ub9ac \uc778\uc9c0 \uc785\uc99d\ud558\uac8c \ub418\uace0 \ubb38\uc81c\uac00 \uc788\uc744\uc2dc\uc5d0\ub294 \ucef4\ud30c\uc77c \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud55c\ub2e4.
\nRoom\uc740 \ub610\ud55c \ucffc\ub9ac\uc5d0 \ub300\ud55c \ubc18\ud658\uac12\uc744 \ud655\uc778\ud55c\ub2e4. \ubc18\ud658\ub418\ub294 \uac1d\uccb4\uc758 \ud544\ub4dc\uc758 \uc774\ub984\uc774 \ub9cc\uc57d\uc5d0 \ub300\uc751\ub418\ub294 \uceec\ub7fc\uc774\ub984\uc774 \uc9c8\uc758\uc751\ub2f5\uc5d0\uc11c \uc77c\uce58\ud558\uc9c0 \uc54a\ub294\ub2e4\uba74 Room\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \ub450\uac00\uc9c0 \ubc29\ubc95\uc911 \ud558\ub098\ub85c \uc54c\ub9bc\uc744 \uc904\uac83\uc774\ub2e4.<\/p>\n- \n
- \uba87\uba87\uc758 \ud544\ub4dc\uba85\ub9cc \uc77c\uce58\ud558\ub294 \uacbd\uc6b0\uc5d0\ub294 \uacbd\uace0 \ubc1c\uc0dd<\/li>\n
- \uc77c\uce58\ud558\uc9c0 \uc54a\ub294 \ud544\ub4dc\uba85\uc774 \uc788\uc744\uc2dc \uc5d0\ub7ec \ubc1c\uc0dd<\/li>\n<\/ul>\n
\uac04\ub2e8\ud55c \ucffc\ub9ac<\/h3>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT * FROM user\")\n public User[] loadAllUsers();\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\ub9e4\uc6b0 \uac04\ub2e8\ud55c \ucffc\ub9ac\ub85c \ubaa8\ub4e0 \uc0ac\uc6a9\uc790 \ubaa9\ub85d\uc744 \ubd88\ub7ec \uc62c\uc218 \uc788\ub2e4. \ucef4\ud30c\uc77c\uc2dc\uac04\uc5d0 Room\uc740 User\ud14c\uc774\ube14\uc5d0 \uc788\ub294 \ubaa8\ub4e0 \uceec\ub7fc\uc744 \ucffc\ub9ac\ud558\ub294 \uac83\uc744 \uc54c\uac8c \ub41c\ub2e4. \ucffc\ub9ac\uac00 \ubb38\ubc95 \uc624\ub958\ub97c \ud3ec\ud568\ud558\uace0 \uc788\uac70\ub098 user \ud14c\uc774\ube14\uc774 \uc874\uc7ac\ud558\uc9c0 \uc54a\ub294\ub2e4\uba74 Room\uc740 \uc801\ub2f9\ud55c \uc5d0\ub7ec\uba54\uc2dc\uc9c0\ub97c \ucef4\ud30c\uc77c \uc2dc\uac04\uc5d0 \uc54c\ub824\uc90d\ub2c8\ub2e4.<\/p>\n
\ucffc\ub9ac\uc5d0 \ud30c\ub77c\ubbf8\ud130 \ub118\uae30\uae30<\/h3>\n
\ub300\ubd80\ubd84\uc758 \uacbd\uc6b0 \ucffc\ub9ac\uc5d0 \ud30c\ub77c\ubbf8\ud130\ub97c \ub118\uaca8 filter\ub97c \ud558\uace0 \uc2f6\uc744\ub54c\uac00 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c\ub4e4\uba74 \uc0ac\uc6a9\uc790\ub97c \ucffc\ub9ac \ud558\ub294\ub370 \ud2b9\uc815 \uc22b\uc790\ubcf4\ub2e4 \ub098\uc774\uac00 \ub9ce\uc740 \uc0ac\ub78c\uc744 \ud45c\ud604\ud55c\ub2e4\uac70\ub098 \ud560\ub54c \ub9d0\uc774\uc8e0. \uc774\ub7ec\ud55c \uc791\uc5c5\uc744 \uc218\ud589\ud558\uae30 \uc704\ud574\uc11c\ub294 \uba54\uc18c\ub4dc\uc5d0 \uc778\uc790\uac12\uc744 \uc560\ub178\ud14c\uc774\uc158\uc5d0\uc11c \uc774\uc6a9\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT * FROM user WHERE age > :minAge\")\n public User[] loadAllUsersOlderThan(int minAge);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\ucffc\ub9ac\uac00 \ucef4\ud30c\uc77c \uc2dc\uac04\uc774 \ucc98\ub9ac\ub420\ub54c, Room\uc740 \ubc14\uc778\ub4dc \uc778\uc790\uac12\uc778 :minAge\ub97c \uba54\uc18c\ub4dc\uc758 \ub9e4\uac1c\ubcc0\uc218\uc778 minAge\uc640 \uc77c\uce58 \uc2dc\ud0b5\ub2c8\ub2e4.
\n\ub9cc\uc57d \uc77c\uce58 \ud558\uc9c0 \uc54a\ub294\ub2e4\uba74 \ucef4\ud30c\uc77c \uc2dc\uac04\uc5d0 \uc5d0\ub7ec\ub97c \ubc1c\uc0dd\uc2dc\ud0b5\ub2c8\ub2e4.
\n\ubcf5\uc218\uac1c\uc758 \ud30c\ub77c\ubbf8\ud130\ub97c \uc0ac\uc6a9\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT * FROM user WHERE age BETWEEN :minAge AND :maxAge\")\n public User[] loadAllUsersBetweenAges(int minAge, int maxAge);\n @Query(\"SELECT * FROM user WHERE first_name LIKE :search \"\n + \"OR last_name LIKE :search\")\n public List<User> findUserWithName(String search);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uceec\ub7fc\uc758 \ubd80\ubd84\uc9d1\ud569 \ubc18\ud658\ud558\uae30<\/h3>\n
\uac1c\ubc1c\uc790\ub294 \ub300\ubd80\ubd84 \uba87\uba87 \ud544\ub4dc\ub9cc \uc5d4\ud2f0\ud2f0\ub85c \ubd80\ud130 \uc5bb\uc73c\ub824\uace0 \ud560\uac81\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uba74 \uc0ac\uc6a9\uc790\uc758 \ubaa8\ub4e0\uc815\ubcf4\ub97c \ub2e4 \ubcf4\uc5ec\uc8fc\uae30\ubcf4\ub2e4\ub294 \uc131\uc774\ub098 \uc774\ub984\uac19\uc740 \uc815\ubcf4\ub9cc \ub9d0\uc774\uc8e0. \uc571\ub0b4\uc758 UI\uc5d0\uc11c \uba87\uba87\uc758 \uceec\ub7fc\ub9cc \uac00\uc838\uc624\ub294 \uac83\ub9cc\uc73c\ub85c \ub9ac\uc18c\uc2a4\uc0ac\uc6a9\uc744 \uc904\uc77c\uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ucffc\ub9ac \ud558\ub294 \uc2dc\uac04\ub3c4 \ub2e8\ucd95\ub418\uaca0\uc8e0.
\nRoom\uc740 Query\ud560\ub54c \ubc18\ud658\uac12\uc774 \uceec\ub7fc\ub4e4\uc758 \ubd80\ubd84\uc9d1\ud569\uc778 \uc774\uc0c1 \uc5b4\ub5a0\ud55c \uc790\ubc14\uae30\ubc18\uc758 \uc624\ube0c\uc81d\ud2b8\ub3c4 \ub9ac\ud134\ud560 \uc218 \uc788\ub3c4\ub85d \ud5c8\uc6a9\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c\ub4e4\uba74 POJO\ub97c \ub9cc\ub4e4\uace0 \uc0ac\uc6a9\uc790\uc758 \uc131\uacfc \uc774\ub984\ub9cc \ubc1b\ub294 \ud074\ub798\uc2a4\ub97c \ub9cc\ub4e4\uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n
\n \n public class NameTuple {\n @ColumnInfo(name=\"first_name\")\n public String firstName;\n @ColumnInfo(name=\"last_name\")\n public String lastName;\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uc704\ucc98\ub7fc POJO\ub97c \ub9cc\ub4e4\uace0, \uc544\ub798\ucc98\ub7fc \ucffc\ub9ac\ub97c \ud569\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT first_name, last_name FROM user\")\n public List<NameTuple> loadFullName();\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nRoom\uc740 @ColumnInfo\uc5d0\u00a0\ud544\ub4dc\uba85\ub9cc \uc801\uc5b4\uc918\ub3c4 \uc54c\uc544\uc11c \ucc99\ucc99 \ub9e4\ud551\uc774 \ub429\ub2c8\ub2e4.<\/p>\n
Collection\uc778\uc790 \ub118\uae30\uae30<\/h3>\n
\uba87\uba87 \ucffc\ub9ac\ub4e4\uc740 \ub7f0\ud0c0\uc784\uae4c\uc9c0\ub294 \uc815\ud655\ud55c \ud30c\ub77c\ubbf8\ud130\uac2f\uc218\ub294 \ubaa8\ub974\uc9c0\ub9cc \ub2e4\uc591\ud55c \uac2f\uc218\uc758 \ud30c\ub77c\ubbf8\ud130\ub97c \ud544\uc694\ub85c \ud558\ub294\uacbd\uc6b0\uac00 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c\ub4e4\uba74, \ud2b9\uc815\uc9c0\uc5ed\ub4e4\uc758 \ubd80\ubd84\uc9d1\ud569\uc73c\ub85c\ubd80\ud130 \ubaa8\ub4e0 \uc0ac\uc6a9\uc790\uc5d0 \ub300\ud55c \uc815\ubcf4\ub97c \ud544\uc694\ub85c \ud558\ub294 \uacbd\uc6b0\ub97c \uc0dd\uac01\ud574\ubd05\uc2dc\ub2e4. Room\uc740 \ub611\ub611\ud558\uac8c\ub3c4 \ub7f0\ud0c0\uc784\uc2dc\uc5d0 \uc774\ub7ec\ud55c collection\ud30c\ub77c\ubbf8\ud130 \uc0ac\uc774\uc988\uc5d0 \ub9de\ucd94\uc5b4 \ud30c\ub77c\ubbf8\ud130 \uac2f\uc218\ub97c \uc790\ub3d9\uc73c\ub85c \ud655\uc7a5\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT first_name, last_name FROM user WHERE region IN (:regions)\")\n public List<NameTuple> loadUsersFromRegions(List<String> regions);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nObservable \ucffc\ub9ac<\/h3>\n
\ucffc\ub9ac\ub97c \uc694\uccad\ud560\ub54c \ubcf4\ud1b5 \ub370\uc774\ud130\uc758 \ubcc0\uacbd\uc5d0 \ub530\ub77c APP\uc758 UI\ub3c4 \uac19\uc774 \uc790\ub3d9\uc73c\ub85c \uac31\uc2e0\ub418\uae38 \uc6d0\ud560\uac81\ub2c8\ub2e4. \uc774\uac83\uc744 \ud558\ub824\uba74 LiveData\ub97c \ub9ac\ud134\uac12\uc73c\ub85c \uac19\ub294 \ucffc\ub9ac\ub97c \uba54\uc18c\ub4dc\uc5d0 \uc815\uc758\ud574\uc918\uc57c \ud569\ub2c8\ub2e4. Room\uc740 database\uac00 \uc5c5\ub370\uc774\ud2b8 \ub428\uc5d0 \ub530\ub77c LiveData\uc758 data\ub3c4 \ubcc0\uacbd\ub420\uc218 \uc788\ub3c4\ub85d \ucf54\ub4dc\ub97c \uc790\ub3d9\uc73c\ub85c \uc0dd\uc131\ud560 \uac83\uc785\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT first_name, last_name FROM user WHERE region IN (:regions)\")\n public LiveData<List<User>> loadUsersFromRegionsSync(List<String> regions);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nRxJava\uc640 \ud568\uaed8 \ud558\ub294 \ubc18\uc751\ud615 \ucffc\ub9ac<\/h3>\n
Room \uc740 RxJava2\uc758 Publisher\ub098 Flowable \ud0c0\uc785\uc73c\ub85c \ub9ac\ud134\uac12\uc744 \uac00\uc9c8\uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uae30\ub2a5\ub4e4\uc744 \uc0ac\uc6a9\ud558\uae30 \uc704\ud574\uc11c\ub294\u00a0android.arch.persistence.room:rxjava2 <\/strong>\uc544\ud2f0\ud329\ud2b8\ub97c Room Group\uc5d0 \uc758\uc874\uc131\uc744 \ucd94\uac00\ud574\uc918\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT * from user where id = :id LIMIT 1\")\n public Flowable<User> loadUserById(int id);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nCursor\ub97c \ud1b5\ud55c \uc9c1\uc811\uc801\uc778 \uc811\uadfc<\/h3>\n
\ub9cc\uc57d \uc9c1\uc811\uc801\uc778 \uc811\uadfc\uc774 \ud544\uc694\ud558\ub2e4\uba74 Cursor\uac1d\uccb4\ub97c \uc0ac\uc6a9\ud560\uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT * FROM user WHERE age > :minAge LIMIT 5\")\n public Cursor loadRawUsersOlderThan(int minAge);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n
\n \n<\/colgroup>\n \n Caution: Cursor API\ub97c \uc0ac\uc6a9\ud558\ub294\uac83\uc740 \ubcc4\ub85c \ucd94\ucc9c\ud558\uc9c0 \uc54a\ub294 \ubc29\ubc95\uc785\ub2c8\ub2e4. \ud589\ub4e4\uc774 \uc874\uc7ac\ud558\ub294\uc9c0 \uc5b4\ub5a4\uac12\uc774 \ud589\uc5d0 \ud3ec\ud568\ub41c\uac83\uc778\uc9c0 \ubcf4\uc7a5\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc774\ubbf8 cursor\uc640 \uad00\ub828\ub41c \ub9cc\ub4e4\uc5b4\uc9c4 \ucf54\ub4dc\uac00 \uc788\uac70\ub098 \ub9ac\ud329\ud1a0\ub9c1\uc774 \ud798\ub4e0 \uacbd\uc6b0\uac00 \uc0ac\uc6a9\ud558\uc2dc\uae38 \ubc14\ub78d\ub2c8\ub2e4.<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n \ub2e4\uc911 \ud14c\uc774\ube14 \ucffc\ub9ac\ud558\uae30<\/h3>\n
\uba87\uba87 \ucffc\ub9ac\ub4e4\uc740 \uc5ec\ub7ec \ud14c\uc774\ube14\ub4e4\uc5d0 \uc811\uadfc\ud558\uc5ec \uacc4\uc0b0\ub41c \uacb0\uacfc\ub97c \ud544\uc694\ub85c \ud55c\ub2e4. Room\uc740 \ud14c\uc774\ube14\uc744 join\ud558\uc5ec \ucffc\ub9ac \uc791\uc131\ud558\ub294\uac83\uc744 \ud5c8\uc6a9\ud558\uace0 \uc788\ub2e4. Flowable\uc774\ub098 LiveData\uac19\uc740 Observable \ub370\uc774\ud130 \ud0c0\uc785\uc73c\ub85c \ubc18\ud658\ub41c\ub2e4\uba74 Room\uc740 \ucffc\ub9ac\uc5d0\uc11c \ubb34\ud6a8\uc131\uc744 \uc704\ud574 \uc5f0\uad00\ub41c \ubaa8\ub4e0 \ud14c\uc774\ube14\uc744 \uac10\uc9c0\ud569\ub2c8\ub2e4.
\n\ub2e4\uc74c \ubcf4\uc5ec\uc8fc\ub294 \ucf54\ub4dc \uc2a4\ub2c8\ud3ab\uc740 \uc5b4\ub5bb\uac8c \ud14c\uc774\ube14\uc774 join\ud558\uc5ec \ud1b5\ud569\ub418\ub294\uc9c0 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4. \ub450 \ud14c\uc774\ube14\uc740\u00a0\ucc45\uc744 \ube4c\ub9ac\ub294 \uc0ac\uc6a9\uc790\ub97c \ud3ec\ud568\ud55c \ud14c\uc774\ube14\uacfc \ud604\uc7ac \ub300\ucd9c\uc911\uc778 \ucc45\uc744 \ud3ec\ud568\ud558\ub294 \ud14c\uc774\ube14\uc744 \ubcf4\uc5ec\uc8fc\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT * FROM book \"\n + \"INNER JOIN loan ON loan.book_id = book.id \"\n + \"INNER JOIN user ON user.id = loan.user_id \"\n + \"WHERE user.name LIKE :userName\")\n public List<Book> findBooksBorrowedByNameSync(String userName);\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\uc774\ub7ec\ud55c \ucffc\ub9ac\ub4e4\ub85c \ubd80\ud130 POJO\ub97c \ubc18\ud658\ud560\uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c\ub4e4\uba74 \uc0ac\uc6a9\uc790\uc640 \uc560\uc644\ub3d9\ubb3c\uc758 \uc774\ub984\uc744 \ubd88\ub7ec\uc624\ub294 \ucffc\ub9ac\ub97c \uc791\uc131\ud558\ub294\uac83\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n
\n\n
\n \n @Dao\npublic interface MyDao {\n @Query(\"SELECT user.name AS userName, pet.name AS petName \"\n + \"FROM user, pet \"\n + \"WHERE user.id = pet.user_id\")\n public LiveData<List<UserPet>> loadUserAndPetNames();\n \/\/ You can also define this class in a separate file, as long as you add the\n \/\/ \"public\" access modifier.\n static class UserPet {\n public String userName;\n public String petName;\n }\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"Room\uc744 \ud65c\uc6a9\ud558\uc5ec Local \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0 data\ub97c \uc800\uc7a5\ud574\ubcf4\uc790 Room \uc740 SQLite\ub97c \ucd94\uc0c1\uacc4\uce35\uc73c\ub85c \uac10\uc2f8\uace0 \uc788\uc73c\uba70, \uc27d\uac8c \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0 \uc811\uadfc\ud558\uc5ec SQLite\ub97c \ub9c8\uad6c\ub9c8\uad6c \uc790\uc720\ub86d\uac8c \ud480\ud30c\uc6cc\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4. Room\uc744 \uc0ac\uc6a9\ud55c\ub2e4\uba74 \ub9cc\ub9cc\uce58 \uc54a\uc740 \uc591\uc758 \uad6c\uc870\ud654\ub41c \ub370\uc774\ud130\ub97c \uc601\uad6c\uc801\uc73c\ub85c \uc800\uc7a5\ud558\uace0 \ucc98\ub9ac\ud558\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\ub3c4 \uadf8\ub920\uc787 \ud558\uac8c \uc774\ub4dd\uc744 \ubcfc\uc218 \uc788\ub294 \ubd80\ubd84\uc774 \uc788\ub2e4. \ub300\ubd80\ubd84\uc758 \uacbd\uc6b0\ub294 \uad00\ub828 \ub370\uc774\ud130\uc758 \uc870\uac01\ub4e4\uc744 \uce90\uc2dc\ud654 \ud558\ub294\uac83\uc774\uc600\ub2e4. \uc774 \ubc29\ubc95\uc5d0\uc11c\ub294 \uae30\uae30\uac00 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[16],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/368"}],"collection":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=368"}],"version-history":[{"count":0,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/368\/revisions"}],"wp:attachment":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}