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In this tutorial, we will be following the guideline of for developing a plugin to develop our JDBC Options Binder plugin. Please also refer to the very first tutorial How to develop a Bean Shell Hash Variable for more details steps.

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Sometime, we may need to write some custom query to populate the options for our multi options field.

2.

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How to solve the problem?

Joget Workflow has provided a plugin type called Form Options Binder Plugin. We will develop one to support JDBC connection and custom query.

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Datasource: Using custom datasource or Joget default datasource
Custom JDBC Driver: The JDBC driver for custom datasource
Custom JDBC URL: The JDBC connection URL for custom datasource
Custom JDBC Username: The username for custom datasource
Custom JDBC Password: The password for custom datasource
SQL Query: The query to populate options.
Use Ajax: A checkbox to decide whether or not it is using AJAX to load options. (For AJAX Cascading Drop-Down List)

The query should also support a syntax to inject dependency values when using AJAX.

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The first column of returned JDBC result will be the value of the option and second column is the label of the option. There will be another optional third column for grouping when no not using AJAX for cascading drop-down list.

5.

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Are there any resources/API that can be

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reused?

We can refer to the implementation of other available Form Options Binder plugins. Joget default datasource can be retrieve with AppUtil.getApplicationContext().getBean("setupDataSource").

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We need to always have our Joget Workflow Source Code ready and builded built by following this guideline.

The following of this tutorial is prepared with a Macbook Pro and Joget Source Code version 5.0.0. Please refer to to the Guideline for developing a plugin for article for other platform commandcommands.

Let said 's say our folder directory is as followingfollows.

Code Block
- Home - joget - plugins - jw-community -5.0.0

The "plugins" directory is the folder we will create and store all our plugins and the "jw-community" directory is where the Joget Workflow Source code is stored.

Run the following command to create a maven project in "plugins" directory.

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Then, the shell script will ask us to key in a version number for your the plugin and ask us request for a confirmation before generate generating the maven project.

Code Block

language	bash

Define value for property 'version':  1.0-SNAPSHOT: : 5.0.0
[INFO] Using property: package = org.joget.tutorial
Confirm properties configuration:
groupId: org.joget.tutorial
artifactId: jdbc_options_binder
version: 5.0.0
package: org.joget.tutorial
Y: : y

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To make it work as a Form Options Binder, we will need to implement org.joget.apps.form.model.FormLoadOptionsBinder interface. We would like to support AJAX Cascading Drop-Down List as well, so we need to implement org.joget.apps.form.model.FormAjaxOptionsBinder interface also.

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As usual, we have to implement all the abstract methods. We will be using AppPluginUtil.getMessage method to support i18n and using constant variable MESSAGE_PATH for message resource bundle directory.

Code Block

language	java
title	Implementation of all basic abstract methods
collapse	true

package org.joget.tutorial;
 
import org.joget.apps.app.service.AppPluginUtil;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormAjaxOptionsBinder;
import org.joget.apps.form.model.FormBinder;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormLoadOptionsBinder;
import org.joget.apps.form.model.FormRowSet;
 
public class JdbcOptionsBinder extends FormBinder implements FormLoadOptionsBinder, FormAjaxOptionsBinder {
    
    private final static String MESSAGE_PATH = "messages/JdbcOptionsBinder";
    
    public String getName() {
        return "JDBC Option Binder";
    }
 
    public String getVersion() {
        return "5.0.0";
    }
    
    public String getClassName() {
        return getClass().getName();
    }
 
    public String getLabel() {
        //support i18n
        return AppPluginUtil.getMessage("org.joget.tutorial.JdbcOptionsBinder.pluginLabel", getClassName(), MESSAGE_PATH);
    }
    
    public String getDescription() {
        //support i18n
        return AppPluginUtil.getMessage("org.joget.tutorial.JdbcOptionsBinder.pluginDesc", getClassName(), MESSAGE_PATH);
    }
 
    public String getPropertyOptions() {
        return AppUtil.readPluginResource(getClassName(), "/properties/jdbcOptionsBinder.json", null, true, MESSAGE_PATH);
    }

    public FormRowSet load(Element element, String primaryKey, FormData formData) {
        return loadAjaxOptions(null); // reuse loadAjaxOptions method
    }
 
    public boolean useAjax() {
        return "true".equalsIgnoreCase(getPropertyString("useAjax")); // let user to decide whether or not to use ajax for dependency field
    }
 
    public FormRowSet loadAjaxOptions(String[] dependencyValues) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}

Then, we have to do create a UI for admin user to provide inputs for our plugin. In getPropertyOptions method, we have already specify that our Plugin Properties Options definition file is locate located at "/properties/jdbcOptionsBinder.json". Let us create a directory "resources/properties" under "jdbc_options_binder/src/main" directory. After create creating the directory, create a file named "jdbcOptionsBinder.json" in the "properties" folder.

In the properties definition options file, we will need to provide options as below. Please note that we can will use "@@message.key@@" syntax to support i18n in our properties options.

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In the Properties Options, we added a button for testing connection when using a custom datasource. This button is calling will call a JSON API to do the test. So, our plugin will need to implement org.joget.plugin.base.PluginWebSupport interface to make it as a Web Service Plugin as well. Let's implement the webService method as following for follows, to test the JDBC connection.

Code Block

language	java

    /**
     * JSON API for test connection button
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException 
     */
    public void webService(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //Limit the API for admin usage only
        boolean isAdmin = WorkflowUtil.isCurrentUserInRole(WorkflowUserManager.ROLE_ADMIN);
        if (!isAdmin) {
            response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        
        String action = request.getParameter("action");
        if ("testConnection".equals(action)) {
            String message = "";
            Connection conn = null;
            try {
                AppDefinition appDef = AppUtil.getCurrentAppDefinition();
                
                String jdbcDriver = AppUtil.processHashVariable(request.getParameter("jdbcDriver"), null, null, null, appDef);
                String jdbcUrl = AppUtil.processHashVariable(request.getParameter("jdbcUrl"), null, null, null, appDef);
                String jdbcUser = AppUtil.processHashVariable(request.getParameter("jdbcUser"), null, null, null, appDef);
                String jdbcPassword = AppUtil.processHashVariable(SecurityUtil.decrypt(request.getParameter("jdbcPassword")), null, null, null, appDef);
                
                Properties dsProps = new Class.forNameProperties(jdbcDriver););
                dsProps.put("driverClassName", jdbcDriver);
                dsProps.put("url", jdbcUrl);
                dsProps.put("username", jdbcUser);
                dsProps.put("password", jdbcPassword);
                DataSource ds = BasicDataSourceFactory.createDataSource(dsProps);
                
                conn = DriverManagerds.getConnection(jdbcUrl, jdbcUser, jdbcPassword);
                
                message = AppPluginUtil.getMessage("form.jdbcOptionsBinder.connectionOk", getClassName(), MESSAGE_PATH);
            } catch (Exception e) {
                LogUtil.error(getClassName(), e, "Test Connection error");
                message = AppPluginUtil.getMessage("form.jdbcOptionsBinder.connectionFail", getClassName(), MESSAGE_PATH) + "\n"  + e.getMessage();
            } finally {
                try {
                    if (conn != null && !conn.isClosed()) {
                        conn.close();
                    }
                } catch (Exception e) {
                    LogUtil.error(DynamicDataSourceManager.class.getName(), e, "");
                }
            }
            try {
                JSONObject jsonObject = new JSONObject();
                jsonObject.accumulate("message", message);
                jsonObject.write(response.getWriter());
            } catch (Exception e) {
                //ignore
            }
        } else {
            response.setStatus(HttpServletResponse.SC_NO_CONTENT);
        }
    }

Once we are done with the properties option to collect input and the web service to test the connection, we can work on the main method of the plugin which is the loadAjaxOptions method.

Code Block

language	java

    public FormRowSet loadAjaxOptions(String[] dependencyValues) {
        FormRowSet rows = new FormRowSet();
        rows.setMultiRow(true);
        
        //add empty option based on setting
        if ("true".equals(getPropertyString("addEmpty"))) {
            FormRow empty = new FormRow();
            empty.setProperty(FormUtil.PROPERTY_LABEL, getPropertyString("emptyLabel"));
            empty.setProperty(FormUtil.PROPERTY_VALUE, "");
            rows.add(empty);
        }
        
        //Check the sql. If require dependency value and dependency value is not exist, return empty result.
        String sql = getPropertyString("sql");
        if ((dependencyValues == null || dependencyValues.length == 0) && sql.contains("?")) {
            return rows;
        }
        
        Connection con = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        
        try {
            DataSource ds = createDataSource();
            con = ds.getConnection();
            
            //support for multiple dependency values
            if (sql.contains("?") && dependencyValues != null && dependencyValues.length > 1) {
                String mark = "?";
                for (int i = 1; i < dependencyValues.length; i++) {
                    mark += ", ?";
                }
                sql = sql.replace("?", mark);
            }
            
            pstmt = con.prepareStatement(sql);
            
            //set query parameters
            if (sql.contains("?") && dependencyValues != null && dependencyValues.length > 0) {
                for (int i = 0; i < dependencyValues.length; i++) {
                    pstmt.setObject(i + 1, dependencyValues[i]);
                }
            }
            
            rs = pstmt.executeQuery();
            ResultSetMetaData rsmd = rs.getMetaData();
            int columnsNumber = rsmd.getColumnCount();
            
            // Set retrieved result to Form Row Set
            while (rs.next()) {
                FormRow row = new FormRow();
                
                String value = rs.getString(1);
                String label = rs.getString(2);
                
                row.setProperty(FormUtil.PROPERTY_VALUE, (value != null)?value:"");
                row.setProperty(FormUtil.PROPERTY_LABEL, (label != null)?label:"");
                
                if (columnsNumber > 2) {
                    String grouping = rs.getString(3);
                    row.setProperty(FormUtil.PROPERTY_GROUPING, grouping);
                }
                
                rows.add(row);
            }
        } catch (Exception e) {
            LogUtil.error(getClassName(), e, "");
        } finally {
            try {
                if (rs != null) {
                    rs.close();
                }
                if (pstmt != null) {
                    pstmt.close();
                }
                if (con != null) {
                    con.close();
                }
            } catch (Exception e) {
                LogUtil.error(getClassName(), e, "");
            }
        }
        
        return rows;
    }
    
    /**
     * To creates data source based on setting
     * @return
     * @throws Exception 
     */
    protected DataSource createDataSource() throws Exception {
        DataSource ds = null;
        String datasource = getPropertyString("jdbcDatasource");
        if ("default".equals(datasource)) {
            // use current datasource
             ds = (DataSource)AppUtil.getApplicationContext().getBean("setupDataSource");
        } else {
            // use custom datasource
            Properties dsProps = new Properties();
            dsProps.put("driverClassName", getPropertyString("jdbcDriver"));
            dsProps.put("url", getPropertyString("jdbcUrl"));
            dsProps.put("username", getPropertyString("jdbcUser"));
            dsProps.put("password", getPropertyString("jdbcPassword"));
            ds = BasicDataSourceFactory.createDataSource(dsProps);
        }
        return ds;
    }

c. Manage the dependency libraries of your plugin

Our plugin is using javaxusing dbcp, javax.servlet.http.HttpServletRequest and javax.servlet.http.HttpServletResponse class, so we will need to add jsp-api and commons-dbcp library to our POM file.

Code Block

language	xml

<!-- Change plugin specific dependencies here -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.0</version>
</dependency>
<dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.3</version>
</dependency>
<!-- End change plugin specific dependencies here -->

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Create directory "resources/messages" under "jdbc_options_binder/src/main" directory. Then, create a "JdbcOptionsBinder.properties" file in the folder. In the properties file, let us add all the message keys and its label labels as below.

Code Block

org.joget.tutorial.JdbcOptionsBinder.pluginLabel=JDBC Binder
org.joget.tutorial.JdbcOptionsBinder.pluginDesc=Used to load field's options using JDBC
form.jdbcOptionsBinder.config=Configure JDBC Binder
form.jdbcOptionsBinder.datasource=Datasource
form.jdbcOptionsBinder.customDatasource=Custom Datasource
form.jdbcOptionsBinder.defaultDatasource=Default Datasource
form.jdbcOptionsBinder.driver=Custom JDBC Driver
form.jdbcOptionsBinder.driver.desc=Eg. com.mysql.jdbc.Driver (MySQL), oracle.jdbc.driver.OracleDriver (Oracle), com.microsoft.sqlserver.jdbc.SQLServerDriver (Microsoft SQL Server)
form.jdbcOptionsBinder.url=Custom JDBC URL
form.jdbcOptionsBinder.username=Custom JDBC Username
form.jdbcOptionsBinder.password=Custom JDBC Password
form.jdbcOptionsBinder.useAjax=Use AJAX for cascade options?
form.jdbcOptionsBinder.addEmpty=Add Empty Option?
form.jdbcOptionsBinder.emptyLabel=Empty Option Label
form.jdbcOptionsBinder.sql=SQL SELECT Query
form.jdbcOptionsBinder.sql.desc=Use question mark (?) in your query to represent dependency values when using AJAX
form.jdbcOptionsBinder.testConnection=Test Connection
form.jdbcOptionsBinder.connectionOk=Database connected
form.jdbcOptionsBinder.connectionFail=Not able to establish connection.

e. Register your plugin to the Felix Framework

We will have to register our plugin class in Activator class (Auto generated in the same class package) to tell the Felix Framework that this is a plugin.

Code Block

language	java

    public void start(BundleContext context) {
        registrationList = new ArrayList<ServiceRegistration>();
        //Register plugin here
        registrationList.add(context.registerService(JdbcOptionsBinder.class.getName(), new JdbcOptionsBinder(), null));
    }

f. Build it and

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test

Let build our plugin. Once the building process is done, we will found find that a "jdbc_options_binder-5.0.0.jar" file is created under "jdbc_options_binder/target" directory.

Then, let us upload the plugin jar to Manage Plugins. After upload uploading the jar file, double check that the plugin is uploaded and activated correctly.

Then, let us create an AJAX Cascading Drop-Down List in a form to test it. Let's create our test form as followingfollows.

Then, configure our select box and JDBC binder.

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In the query, we will use the following query to get the user list based on group id.

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The user select box options changed based on the selected values of group select box.

Now, let's change the query to the following to test Cascading test the Cascading Drop-Down List without using AJAX.

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Remember to un-tick the "Use AJAX for cascade options?" option to make it not using use AJAX.

Yes, it work works as well. Then, we can test the custom configuration and the test connection button.

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You can download the source code from jdbc_options_binder_src.zip.

To download the ready-to-use plugin jar, please find it in http://marketplace.joget.org/.

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Key

2.

How to solve the problem?

5.

Are there any resources/API that can be

reused?

c. Manage the dependency libraries of your plugin

e. Register your plugin to the Felix Framework

f. Build it and

test