Difference between revisions of "EDT:Default SQL Generation"

Revision as of 03:38, 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
					(?, ?, ?, ?, ?)
			};

• • GET Statement
• OPEN Statement
• REPLACE Statement