Generate JETemplate

The main advantage verses the JETemplate is that the complexity of the code is in the generator class for the template and not the template itself. This may be of use if you want to use a given model that provides all necessairy data but some data must be computed from the model. All this can be done in a JETemplate but may complicate the template itself so that it is not easily maintained.

You start with calling the wizard File->New->Other...->Java->Java Code Generation. With the first page of the wizard you may be familiar since it is basicly identical with the Java class wizard although some elements are missing that are not needed here. If you had the focus on a project with a source folder this Source folder is already inserted. The same is true for the package. Supply the needed elements.

Proceed to the second page with "Next".

On the second page in the first section you specify the way to generate the code. For the generation of a Java Emitter template you switch the radio button to "Generation" and leaf the rest as is. Generation states that the code is generated from scratch. Jet in the second row says that the a JETemplate should be generated. The third row tells something about the input model. With "DB with input file" you specify the input model through an input file.

Now you have to specify the other needed input fields. As an "Data Input" file we choose the SQL create script for an USER table. For the generator class supply InitializableDbBeanGenerator. The generator class must implement the interface IJetCodeGenerator. Since the create script is for an Oracle table we choose the Oracle database product.

As you choose the option "DB with input file" the third page is basicly optional. Some templates/input model may need the information of the third page. Hit Finish to generate the code.

This produces the following code:

package ch.sahits.person;

import java.sql.Date;
import java.util.Hashtable;

/**
 * This class represents the database table
 * USER.
*/
public class UserBean {

    /** <code>name</code>holds the value of the field NAME */ 
    private String name;
    /** <code>surname</code> holds the value of the field SURNAME */ 
    private String surname;
    /** <code>email</code> holds the value of the field EMAIL */ 
    private String email;
    /** <code>bitrhDate</code> holds the value of the field BITRH_DATE */ 
    private Date bitrhDate;

   /**
     * Constructor initializes the bean with a list of values.
     * @param values Hashtable
     */
   public UserBean(Hashtable<String,Object> values){
        init(values);
    }

   /**
     * Initialize the bean with a list of values.
     * @param values Hashtable
     */
    private void init(Hashtable<String,Object> values){
	  if (values.contains("NAME")){
	       setName((String)values.get("NAME"));
	  }
	  if (values.contains("SURNAME")){
	       setSurname((String)values.get("SURNAME"));
	  }
	  if (values.contains("EMAIL")){
	       setEmail((String)values.get("EMAIL"));
	  }
	  if (values.contains("BITRH_DATE")){
	       setBitrhDate((Date)values.get("BITRH_DATE"));
	  }
    }

    /**
     * Retrieve the value of the field NAME.
     * @return the value of the field
     */
    public String getName(){
        return name;
    }

    /**
     * Set the value of the field NAME.
     * @param name value to be set for NAME
     */
    public void setName(String name){
        this.name = name;
    }

    /**
     * Retrieve the value of the field SURNAME.
     * @return the value of the field
     */
    public String getSurname(){
        return surname;
    }

    /**
     * Set the value of the field SURNAME.
     * @param surname value to be set for SURNAME
     */
    public void setSurname(String surname){
        this.surname = surname;
    }

    /**
     * Retrieve the value of the field EMAIL.
     * @return the value of the field
     */
    public String getEmail(){
        return email;
    }

    /**
     * Set the value of the field EMAIL.
     * @param email value to be set for EMAIL
     */
    public void setEmail(String email){
        this.email = email;
    }

    /**
     * Retrieve the value of the field BITRH_DATE.
     * @return the value of the field
     */
    public Date getBitrhDate(){
        return bitrhDate;
    }

    /**
     * Set the value of the field BITRH_DATE.
     * @param bitrhDate value to be set for BITRH_DATE
     */
    public void setBitrhDate(Date bitrhDate){
        this.bitrhDate = bitrhDate;
    }

}

The same result can be achieved (at least if you have the same structure defined) with option "DB with connection" indicating that the structural information on the table is retrieved through the database connection. Now you must not specify a "Data Input" file. The Jet template and DB product are still needed. Note that for the generation with a connection only a MySQL database is supported (in version 0.9.3). Other database products can be added though extension.

Now you must proceed with Next to the third page to supply the data needed for the connection. Host, port and user name are already supplied with sensible values. Add the database name, password and table name.

Before you can finish you must verify that the connection data is valid by hitting the button Test connection.

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