A Generic DAO for Mongo using MongoDB API Java
No external library used for mapping EXCEPT google.gson, all mapping is done by owners own logics and implimentations
Uses google gson library and mongo Json library for serializing and deserializing purposes
dao --> Abstract And Concrete implimentations of data access classes ( Standard generic Dao pattern)
models --> POJO classes
scaffolder --> Generates the concrete model dao classes instead of writing redundant classes ( PLEASE SEE Program.java TO UNDERSTAND HOW IT ALL WORKS
mapper --> An attempt to create a Object Document Modelling (ORMs for non-relational databases). Project still underway , maybe subjected to extensive edits and revisions
mapper is an attempt to create an easy to use ORM for MongoDb and Java
Description
Suppose you have a Mongo Database named ProductDB with collections CustomerCollection and ProductCollection
Now just like we create mappings in hibernate , you define a xml mapping file as follows :
<db name="ProductDB">
<collection name="CustomerCollection" class="Customer.java">
<attribute name="CustomerName" key="customer_id" type="int" />
<attribute name="CustomerAddress" key="customer_add" type="String" />
</collection>
<collection name="ProductCollection" class="Product.java">
<attribute name="ProductName" key="prod_name" type="String" />
<attribute name="ProductPrice" key="prod_price" type="double" />
</collection>
-
Database tag (db)
- Has only one attribute name , the name of a existing mongo database
-
Collection tag (collection)
- has two attributes name and class , name is for the existing collection in your database and class is for the name of the class that the collection will be mapped into.
-
Attribute tag (attribute)
- has three attributes name , key and type . name is for the NEW variable you want to create , key is for the EXISTING key attribute in your collection and type is for the data type of variable.