Revision as of 21:47, 28 December 2011

Overview

    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 Records 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 Variables Declaration

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

Default SQL For ADD Statement 

    Click anywhere in the EGL SQL statement and press CTRL+1, and press “Add SQL Statement” proposal, default SQL statement
will be added to the below 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  

  ss   (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. =