Difference between revisions of "EDT:Default SQL Generation"

Revision as of 03:51, 22 December 2011

         Quick Assist Support for Default SQL Generation

  EDT 0.7.0 release provides quick assist support for the following EGL action statements to 
generate default SQL statements:
1 ADD Statement
2 DELETE Statement
3 GET Statement
4 OPEN Statement
5 REPLACE Statement

Use examples to show how to use the feature in EDT plugin.

EGL Record Definition:
    record Product{@Table {name="Product"}}
       id bigint{@Id};
 name string;
 price float;
end


The above is a basic record definition, one must use annotation @Id to specific which record 
field is used as primary key, also can use annotation @Table to specify to which table the record 
is mapped, just as 'Product' definition shows, but this is optional.

record OrderItem type Entity{@table{name = "OrderItem"}}
ITEM_ID int{@Id};
NAME string{ @Column { insertable=true } };
IMAGE string?{ @Column { updateable=true } };
PRICE decimal(7, 2)?;
DESCRIPTION string?;
end

The above is an entity record definition that is generated from a table schema.



EGL Variable Definition
basicRec Product;    
itemEntity OrderItem;
rs SQLResultSet?;
ds SQLDataSource? = new SQLDataSource("jdbc:derby:C:/databases/EGLDerbyR7;create=true");    


ADD Statement

Click anywhere in the EGL statement and press CTRL+1, and press “Add SQL Statement” proposal, 
default SQL statement will be added to the above statement: 
   (1) add basicRec to ds; //for basic record 

Change To: 
   add basicRec to ds with 
       #sql{ insert into Product (id, name, price) values (?, ?, ?)}; 

   (2) add itemEntity to ds; //for entity record

Change To:
    add itemEntity to ds with
			#sql{
				insert into OrderItem
					(ITEM_ID, Name, IMAGE, price, description)
				values
					(?, ?, ?, ?, ?)
			};

DELETE Statement
  (3) delete basicRec from ds; // for basic record

Change To:
    delete basicRec from ds with
			#sql{
				delete from Product
				where id = ?
			};
 
  (4) delete itemEntity from ds; //for entity record

Change To:
      delete itemEntity from ds with
			#sql{
				delete from OrderItem
				where ITEM_ID = ?
			};

GET Statement
  (5) GET basicRec from ds; //for basic record

Change To:
     GET basicRec from ds using basicRec.id with
		#sql{
		   select id, rtrim(name), price
		   from  Product
		   where id = ?
		};


  (6) GET itemEntity from ds; //for entity record

Change To:
     GET itemEntity from ds using itemEntity.ITEM_ID  with
		#sql{
		   select ITEM_ID, rtrim(Name), rtrim(IMAGE), price, rtrim(description)
		   from OrderItem
		   where ITEM_ID = ?
		};


OPEN Statement 
  (7) rows OrderItem; open rs from ds for rows; 

Change To:
    open rs from ds using rows.ITEM_ID  with
			#sql{
				select ITEM_ID, rtrim(Name), rtrim(IMAGE), price, rtrim(description)
				from OrderItem
				where ITEM_ID =  ?
			};
  
REPLACE Statement
  (8) replace itemEntity to ds ;

Change To:
    replace itemEntity to ds with
			#sql{
				update OrderItem
				set Name = ?,IMAGE = ?,
				    price = ?,description = ?
				where ITEM_ID = ?
			} ;


Now the feature can only generate default SQL statements for entity record that does not contain any entity relationship field.