Difference between revisions of "EDT:Default SQL Generation"

Revision as of 03:41, 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 = ?
			};
   

• OPEN Statement
• REPLACE Statement