I am new to Realm. Actually, Realm doesn't provide us functionality for Foreign key and I want to use the functionality of Foreign key.
So Here is my model :
public class CategoryInfo extends RealmObject {
#SerializedName("name")
String name;
#SerializedName("id")
int id;
#SerializedName("sub_category")
RealmList<SubCategoryInfo> subCategoryList;
public Data() {
}
public Data(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void setSubCategory(RealmList<SubCategoryInfo> subCategoryList) {
this.subCategoryList = subCategoryList;
}
public RealmList<SubCategoryInfo> getSubCategoryList() {
return subCategoryList;
}
}
public class SubCategoryInfo extends RealmObject {
#SerializedName("sub_cat_name")
String subCatName;
#SerializedName("sub_id")
int subId;
int catId;
public String getSubCatName() {
return subCatName;
}
public void setSubCatName(String subCatName) {
this.subCatName = subCatName;
}
public int getSubId() {
return subId;
}
public void setSubId(int subId) {
this.subId = subId;
}
public void setCatId(int catId) {
this.catId = catId;
}
}
So now when I am getting a response from API side I am updating my object by below code to add catId in SubCatInfo class.
List<CategoryInfo> catInfoList = catResult.getData();
for(CategoryInfo catInfo:catInfoList){
List<SubCategoryInfo> subCatList = catInfo.getSubCategoryList();
if (subCatList != null) {
for (SubCategoryInfo subCatInfo:SubCategoryInfo) {
subCatInfo.setCatId(catInfo.getId());
}
}
}
So What I want is that when I will delete any category from the main table, subCategory should be automatically deleted. So By what way I can achieve this functionality?
Thank you in advance.
Related
I am trying to insert realm lists to my realmdb in my first insert there is no problem but when I insert another realmList with a different class, my old values are deleted. So how can I insert a realmlist to DB? inserts are done separately.
RealmList<Product> insertedProduct = new RealmList<Product>();
RealmList<ProductSubCategory> insertedSubCategory = new RealmList<ProductSubCategory>();
RealmList<ProductMainCategory> insertedMainCategory = new RealmList<ProductMainCategory>();
... inserting to realm list firt time ...
insertRealmList(insertedProduct); //inserting to realmDB first time
insertRealmList(insertedSubCategory); //inserting to realmDB first time
insertRealmList(insertedMainCategory); //inserting to realmDB first time
first insert to realmDB
RealmList insert function
private void insertRealmList(final RealmList realmObject) {
mRealm = Realm.getDefaultInstance();
realmTask = mRealm.executeTransactionAsync(
new Realm.Transaction() {
#Override
public void execute(Realm realm) {
realm.copyToRealmOrUpdate(realmObject);
}
},
new Realm.Transaction.OnSuccess() {
#Override
public void onSuccess() {
Log.i(TAG, "onSuccess: successfully inserted data");
}
},
new Realm.Transaction.OnError() {
#Override
public void onError(Throwable error) {
Log.i(TAG, "onError: error while inserting " + "error: " + error);
}
}
);
}
... inserting to realm list second time...
insertRealmList(insertedLanguages); //insert realmDB second time
second insert to realmDB
PRODUCT MODEL
package Model;
import io.realm.RealmList;
import io.realm.RealmObject;
import io.realm.annotations.Ignore;
import io.realm.annotations.Index;
import io.realm.annotations.PrimaryKey;
public class Product extends RealmObject {
#PrimaryKey
#Index
private int ID;
#Index
private int PLU_NO;
private String PRODUCT_NAME;
private String MAIN_CATEGORY;
private String SUB_CATEGORY;
private String TYPE;
private String TUS;
private Double PRICE;
private String CALORIE;
private String COOKING_TIME;
private RealmList<String> PRODUCT_NAME_LANGUAGES;
private RealmList<String> PRODUCT_DESCRIPTION_LANGUAGES;
private String IMAGE_BASE_HORIZONTAL; //4/3
private String IMAGE_BASE_VERTICAL; //16/9
private String VIDEO_NAME; //video name
#Ignore
private int AMOUNT;
#Ignore
private int WINDOW_AMOUNT = 1;
public Product(int ID, int PLU_NO, String PRODUCT_NAME, String MAIN_CATEGORY, String SUB_CATEGORY, String TYPE, String TUS, Double PRICE, String CALORIE, String COOKING_TIME, RealmList<String> PRODUCT_NAME_LANGUAGES, RealmList<String> PRODUCT_DESCRIPTION_LANGUAGES, String IMAGE_BASE_HORIZONTAL, String IMAGE_BASE_VERTICAL, String VIDEO_NAME) {
this.ID = ID;
this.PLU_NO = PLU_NO;
this.PRODUCT_NAME = PRODUCT_NAME;
this.MAIN_CATEGORY = MAIN_CATEGORY;
this.SUB_CATEGORY = SUB_CATEGORY;
this.TYPE = TYPE;
this.TUS = TUS;
this.PRICE = PRICE;
this.CALORIE = CALORIE;
this.COOKING_TIME = COOKING_TIME;
this.PRODUCT_NAME_LANGUAGES = PRODUCT_NAME_LANGUAGES;
this.PRODUCT_DESCRIPTION_LANGUAGES = PRODUCT_DESCRIPTION_LANGUAGES;
this.IMAGE_BASE_HORIZONTAL = IMAGE_BASE_HORIZONTAL;
this.IMAGE_BASE_VERTICAL = IMAGE_BASE_VERTICAL;
this.VIDEO_NAME = VIDEO_NAME;
}
public Product() {
}
public int getID() {
return ID;
}
public void setID(int ID) {
this.ID = ID;
}
public int getPLU_NO() {
return PLU_NO;
}
public void setPLU_NO(int PLU_NO) {
this.PLU_NO = PLU_NO;
}
public String getPRODUCT_NAME() {
return PRODUCT_NAME;
}
public void setPRODUCT_NAME(String PRODUCT_NAME) {
this.PRODUCT_NAME = PRODUCT_NAME;
}
public String getMAIN_CATEGORY() {
return MAIN_CATEGORY;
}
public void setMAIN_CATEGORY(String MAIN_CATEGORY) {
this.MAIN_CATEGORY = MAIN_CATEGORY;
}
public String getSUB_CATEGORY() {
return SUB_CATEGORY;
}
public void setSUB_CATEGORY(String SUB_CATEGORY) {
this.SUB_CATEGORY = SUB_CATEGORY;
}
public String getTYPE() {
return TYPE;
}
public void setTYPE(String TYPE) {
this.TYPE = TYPE;
}
public String getTUS() {
return TUS;
}
public void setTUS(String TUS) {
this.TUS = TUS;
}
public Double getPRICE() {
return PRICE;
}
public void setPRICE(Double PRICE) {
this.PRICE = PRICE;
}
public String getCALORIE() {
return CALORIE;
}
public void setCALORIE(String CALORIE) {
this.CALORIE = CALORIE;
}
public String getCOOKING_TIME() {
return COOKING_TIME;
}
public void setCOOKING_TIME(String COOKING_TIME) {
this.COOKING_TIME = COOKING_TIME;
}
public RealmList<String> getPRODUCT_NAME_LANGUAGES() {
return PRODUCT_NAME_LANGUAGES;
}
public void setPRODUCT_NAME_LANGUAGES(RealmList<String> PRODUCT_NAME_LANGUAGES) {
this.PRODUCT_NAME_LANGUAGES = PRODUCT_NAME_LANGUAGES;
}
public RealmList<String> getPRODUCT_DESCRIPTION_LANGUAGES() {
return PRODUCT_DESCRIPTION_LANGUAGES;
}
public void setPRODUCT_DESCRIPTION_LANGUAGES(RealmList<String> PRODUCT_DESCRIPTION_LANGUAGES) {
this.PRODUCT_DESCRIPTION_LANGUAGES = PRODUCT_DESCRIPTION_LANGUAGES;
}
public String getIMAGE_BASE_HORIZONTAL() {
return IMAGE_BASE_HORIZONTAL;
}
public void setIMAGE_BASE_HORIZONTAL(String IMAGE_BASE_HORIZONTAL) {
this.IMAGE_BASE_HORIZONTAL = IMAGE_BASE_HORIZONTAL;
}
public String getIMAGE_BASE_VERTICAL() {
return IMAGE_BASE_VERTICAL;
}
public void setIMAGE_BASE_VERTICAL(String IMAGE_BASE_VERTICAL) {
this.IMAGE_BASE_VERTICAL = IMAGE_BASE_VERTICAL;
}
public String getVIDEO_NAME() {
return VIDEO_NAME;
}
public void setVIDEO_NAME(String VIDEO_NAME) {
this.VIDEO_NAME = VIDEO_NAME;
}
public int getAMOUNT() {
return AMOUNT;
}
public void setAMOUNT(int AMOUNT) {
this.AMOUNT = AMOUNT;
}
public int getWINDOW_AMOUNT() {
return WINDOW_AMOUNT;
}
public void setWINDOW_AMOUNT(int WINDOW_AMOUNT) {
this.WINDOW_AMOUNT = WINDOW_AMOUNT;
}
public void setDEFAULT_WINDOW_AMOUNT() {
this.WINDOW_AMOUNT = 1;
}
}
LANGUAGE MODEL
package Model;
import io.realm.RealmObject;
public class Language extends RealmObject {
#PrimaryKey
#Index
private int ID;
private String ICON;
private String NAME;
public Language(){
}
public Language(int ID, String ICON, String NAME) {
this.ID = ID;
this.ICON = ICON;
this.NAME = NAME;
}
public int getId() {
return ID;
}
public void setId(int id) {
this.ID = id;
}
public String getICON() {
return ICON;
}
public void setICON(String ICON) {
this.ICON = ICON;
}
public String getName() {
return NAME;
}
public void setName(String name) {
this.NAME = name;
}
}
Other two models are similar with product.
Please try the following method:
private <T extends RealmModel> void insertRealmList(final List<T> objects) {
try (Realm realmInstance = Realm.getDefaultInstance()) {
realmInstance.executeTransaction(realm -> {
for (T object : objects) {
realmInstance.insertOrUpdate(object);
}
});
}
}
Hope this helps!
In My application I get data from a web service and display those data in recycler view. After that I'm planing to add those data in to local sqlite database and display those data when user open application without internet connection.
Here's a simple model class I'm using to pars JSON result using GSON
public class Repo implements Parcelable {
#SerializedName("id")
#Expose
private Integer id;
#SerializedName("name")
#Expose
private String name;
#SerializedName("url")
#Expose
private String url;
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeValue(this.id);
dest.writeString(this.name);
dest.writeString(this.url);
}
public Repo() {
}
protected Repo(Parcel in) {
this.id = (Integer) in.readValue(Integer.class.getClassLoader());
this.name = in.readString();
this.url = in.readString();
}
public Integer getId() {
return id;
}
public String getName() {
return name;
}
public String getUrl() {
return url;
}
public void setId(Integer id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setUrl(String url) {
this.url = url;
}
public static final Creator<Repo> CREATOR = new Creator<Repo>() {
#Override
public Repo createFromParcel(Parcel source) {
return new Repo(source);
}
#Override
public Repo[] newArray(int size) {
return new Repo[size];
}
};
}
I can create a almost identical model class to represent SQLite data. In here I'm using ORMlite. But this is very similar situation for other ORMs.
#DatabaseTable(tableName = Repo.TABLE_NAME)
public class Repo {
public static final String TABLE_NAME = "repo";
#DatabaseField(columnName = "repo_id")
private long repoId;
#DatabaseField(columnName = "name")
private String name;
public long getRepoId() {
return repoId;
}
public String getName() {
return name;
}
public void setRepoId(long repoId) {
this.repoId = repoId;
}
public void setName(String name) {
this.name = name;
}
}
But by the time I'm trying to save these data in to SQLite database I already have data objects set in GSON model classes. It's kind a redundant thing copy object from GSON model and setting that values in to SQLite model. So I came up with below solution by trying to use single model class to represent both.
#DatabaseTable(tableName = Repo.TABLE_NAME)
public class Repo implements Parcelable {
public static final String TABLE_NAME = "repo";
#DatabaseField(columnName = "repo_id")
#SerializedName("id")
#Expose
private Integer id;
#DatabaseField(columnName = "name")
#SerializedName("name")
#Expose
private String name;
#SerializedName("url")
#Expose
private String url;
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeValue(this.id);
dest.writeString(this.name);
dest.writeString(this.url);
}
public Repo() {
}
protected Repo(Parcel in) {
this.id = (Integer) in.readValue(Integer.class.getClassLoader());
this.name = in.readString();
this.url = in.readString();
}
public Integer getId() {
return id;
}
public String getName() {
return name;
}
public String getUrl() {
return url;
}
public void setId(Integer id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setUrl(String url) {
this.url = url;
}
public static final Creator<Repo> CREATOR = new Creator<Repo>() {
#Override
public Repo createFromParcel(Parcel source) {
return new Repo(source);
}
#Override
public Repo[] newArray(int size) {
return new Repo[size];
}
};
}
I have try this with different type of model class where it only had String type fields. Since GSON uses types like Integer,Boolean That stopping me from using same model for SQLite because database does not identify Integer as a type, in order to work it need to be int.
So what is the professional way to handle this ? Don't I have any other option other than going back to the method of creating two separate model class to represent SQLite and GSON.
Yout approach is absolutely correct, but i think you are putting too much effort reinventing the wheel
You can easily achieve the described task using Room
I have two classes.
Class SubCategory
public class SubCategory implements Comparable<SubCategory>{
private int scid;
private String scname;
public SubCategory(int scid, String scname) {
this.scid = scid;
this.scname = scname;
}
public int getScid() {
return scid;
}
public void setScid(int scid) {
this.scid = scid;
}
public String getScname() {
return scname;
}
public void setScname(String scname) {
this.scname = scname;
}
public int compareTo(SubCategory subCategory){
return this.getScname().compareTo(subCategory.getScname());
}
}
Class Category
public class Category implements Comparable<Category>{
private int id;
private String name;
private String image;
private int display_with;
private List<SubCategory> subcategories;
public Category(int id, String name, String image, int display_with, List<SubCategory> subcategories) {
this.id = id;
this.name = name;
this.image = image;
this.display_with = display_with;
this.subcategories = subcategories;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public int getDisplay_with() {
return display_with;
}
public void setDisplay_with(int display_with) {
this.display_with = display_with;
}
public List<SubCategory> getSubcategories() {
return subcategories;
}
public void setSubcategories(List<SubCategory> subcategories) {
this.subcategories = subcategories;
}
public int compareTo(Category category){
return this.getName().compareTo(category.getName());
}
}
This is retrofir request.
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Constants.BASERESTURL)
.addConverterFactory(GsonConverterFactory.create())
.build();
I am Parsing the data with gson library in retrofit response
public void onResponse(retrofit.Response<List<Category>> response, Retrofit retrofit) {
loading.dismiss();
List<Category> categories = response.body();
Collections.sort(categories);
Utility.setCategories(categories);
}
i can sort the categories with Collections.sort(categories);
But how to sort subcategories with category??
You can do this right in setSubcategories, so everytime you set new subcategories they will get sorted:
public void setSubcategories(List<SubCategory> subcategories) {
Collections.sort(subcategories)
this.subcategories = subcategories;
}
Also you should replace this.subcategories = subcategories; with this.setSubcategories(subcategories) in your Constructor.
I have VisitingCardPOJO form table. I want update single entry say where no=3
VisitingCardPOJO.java
public class VisitingCardPOJO extends RealmObject {
#PrimaryKey private int no;
private String name;
private String address;
public int getNo() {
return no;
}
public void setNo(int no) {
this.no = no;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
I found the solution as and It worked
public void updateNewCard(Realm realm, VisitingCardPOJO card) {
realm.beginTransaction();
VisitingCardPOJO toEdit = realm.where(VisitingCardPOJO.class)
.equalTo("no", card.getNo()).findFirst();
toEdit.setName(card.getName());
toEdit.setAddress(card.getAddress());
realm.commitTransaction();
}
see demo for Realm
The actual right way to do it is this
public void updateNewCard(Realm realm, VisitingCardPOJO card) {
final int no = card.getNo();
realm.executeTransaction(new Realm.Transaction() {
#Override
public void execute(Realm realm) {
VisitingCardPOJO toEdit = realm.where(VisitingCardPOJO.class)
.equalTo("no", no).findFirst();
if(toEdit != null) {
toEdit.setName(card.getName());
toEdit.setAddress(card.getAddress());
}
}
});
}
I recently heard about Realm for android (also available for iOS) in this talk by Joaquim Verques . Very interesting and very powerful tool for persistent data.
I decided to give it a try after the video, researching and reading the documentation.
I found it very easy to use and set up but i end up stuck in the middle of my project because i couldn't manage to successfully make a query with many to many relationships.
I have created a small example for this topic.
My models:
public class Feed extends RealmObject {
#PrimaryKey
private int id;
private String title;
private String description;
private String link;
private Terms terms;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
public Terms getTerms() {
return terms;
}
public void setTerms(Terms terms) {
this.terms = terms;
}
}
public class Terms extends RealmObject {
private String tag;
private RealmList<Category> categories;
public String getTag() {
return tag;
}
public void setTag(String tag) {
this.tag = tag;
}
public RealmList<Category> getCategories() {
return categories;
}
public void setCategories(RealmList<Category> categories) {
this.categories = categories;
}
}
public class Category extends RealmObject {
#PrimaryKey
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
So far so good, now im going to save a list of feeds to realm (make it persistent) and then try to make some query.
public static void test(final Context context,final List<Feed> feedList) {
Realm realm = null;
try {
realm = Realm.getInstance(context);
realm.beginTransaction();
realm.copyToRealmOrUpdate(feedList);
realm.commitTransaction();
RealmResults<Feed> realmResults = realm.where(Feed.class).findAll();// return me all feeds
RealmResults<Feed> realmResults1 = realm.where(Feed.class).equalTo("id", 1).findAll(); // return feed with id 1
RealmResults<Feed> realmResults2 = realm.where(Feed.class).equalTo("terms.tag", "tech").findAll(); // return feeds //with tag = "tech"
RealmResults<Feed> realmResults3 = realm.where(Feed.class).equalTo("terms.category.name", "test").findAll(); //exception here
}
} catch (Exception e) {
//Empty
Log.d("Test","",e);
} finally {
if (realm != null)
realm.close();
}
}
}
Everything run well untill the last query and i get this exception:"java.lang.IllegalArgumentException: Invalid query: category does not refer to a class."
So my question is How do i do that kind of query successfully, as i will like realm to return me every feed with terms which has at least 1 category with name = "test"
Thank you very much
Your field is called "categories" and not "category". The third query should be:
RealmResults<Feed> realmResults3 = realm.where(Feed.class).equalTo("terms.categories.name", "test").findAll();