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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.FormBinder;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormLoadBinder;
import org.joget.apps.form.model.FormLoadElementBinder;
import org.joget.apps.form.model.FormLoadMultiRowElementBinder;
import org.joget.apps.form.model.FormRowSet;
 
public class JdbcLoadBinder extends FormBinder implements FormLoadBinder, FormLoadElementBinder, FormLoadMultiRowElementBinder {
    
    private final static String MESSAGE_PATH = "messages/JdbcLoadBinder";
    
    public String getName() {
        return "JDBC Load 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.JdbcLoadBinder.pluginLabel", getClassName(), MESSAGE_PATH);
    }
    
    public String getDescription() {
        //support i18n
        return AppPluginUtil.getMessage("org.joget.tutorial.JdbcLoadBinder.pluginDesc", getClassName(), MESSAGE_PATH);
    }
 
    public String getPropertyOptions() {
        return AppUtil.readPluginResource(getClassName(), "/properties/jdbcLoadBinder.json", null, true, MESSAGE_PATH);
    }
 
    public FormRowSet load(Element element, String primaryKey, FormData formData) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}

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

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

Code Block

language	js

[{
    title : '@@form.jdbcLoadBinder.config@@',
    properties : [{
        name : 'jdbcDatasource',
        label : '@@form.jdbcLoadBinder.datasource@@',
        type : 'selectbox',
        options : [{
            value : 'custom',
            label : '@@form.jdbcLoadBinder.customDatasource@@'
        },{
            value : 'default',
            label : '@@form.jdbcLoadBinder.defaultDatasource@@'
        }],
        value : 'default'
    },{
        name : 'jdbcDriver',
        label : '@@form.jdbcLoadBinder.driver@@',
        description : '@@form.jdbcLoadBinder.driver.desc@@',
        type : 'textfield',
        value : 'com.mysql.jdbc.Driver',
        control_field: 'jdbcDatasource',
        control_value: 'custom',
        control_use_regex: 'false',
        required : 'true'
    },{
        name : 'jdbcUrl',
        label : '@@form.jdbcLoadBinder.url@@',
        type : 'textfield',
        value : 'jdbc:mysql://localhost/jwdb?characterEncoding=UTF8',
        control_field: 'jdbcDatasource',
        control_value: 'custom',
        control_use_regex: 'false',
        required : 'true'
    },{
        name : 'jdbcUser',
        label : '@@form.jdbcLoadBinder.username@@',
        type : 'textfield',
        control_field: 'jdbcDatasource',
        control_value: 'custom',
        control_use_regex: 'false',
        value : 'root',
        required : 'true'
    },{
        name : 'jdbcPassword',
        label : '@@form.jdbcLoadBinder.password@@',
        type : 'password',
        control_field: 'jdbcDatasource',
        control_value: 'custom',
        control_use_regex: 'false',
        value : ''
    },{
        name : 'sql',
        label : '@@form.jdbcLoadBinder.sql@@',
        description : '@@form.jdbcLoadBinder.sql.desc@@',
        type : 'codeeditor',
        mode : 'sql',
        required : 'true'
    }],
    buttons : [{
        name : 'testConnection',    
        label : '@@form.jdbcLoadBinder.testConnection@@',
        ajax_url : '[CONTEXT_PATH]/web/json/app[APP_PATH]/plugin/org.joget.tutorial.JdbcLoadBinder/service?action=testConnection',
        fields : ['jdbcDriver', 'jdbcUrl', 'jdbcUser', 'jdbcPassword'],
        control_field: 'jdbcDatasource',
        control_value: 'custom',
        control_use_regex: 'false'
    }]
}]

Same as JDBC Options Binder, we will need to add a test connection button for custom JDBC setting. Please refer to How to develop a JDBC Options Binder on the Web Service Plugin implementation.

Once we done 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 load method.

Code Block

language	java

    public FormRowSet load(Element element, String primaryKey, FormData formData) {
        FormRowSet rows = new FormRowSet();
        rows.setMultiRow(true);
        //Check the sql. If require primary key and primary key is null, return empty result.
        String sql = getPropertyString("sql");
        if ((primaryKey == null || primaryKey.isEmpty()) && sql.contains("?")) {
            return rows;
        }
        
        Connection con = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        
        try {
            DataSource ds = createDataSource();
            con = ds.getConnection();
            
            pstmt = con.prepareStatement(sql);
            
            //set query parameters
            if (sql.contains("?") && primaryKey != null && !primaryKey.isEmpty()) {
                pstmt.setObject(1, primaryKey);
            }
            
            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();
                
                //get the name of each column as field id 
                for (int i = 1; i <= columnsNumber; i++) {
                    String name = rsmd.getColumnName(i);
                    String value = rs.getString(name);
                    
                    if (FormUtil.PROPERTY_ID.equals(name)) {
                        row.setId(value);
                    } else {
                        row.setProperty(name, (value != null)?value:"");
                    }
                }
                
                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 -->

d. Make your plugin internationalization (i18n) ready

We are using i18n message key in getLabel and getDescription method. We also used i18n message key in our properties options definition as well. So, we will need to create a message resource bundle properties file for our plugin.

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

Code Block

org.joget.tutorial.JdbcLoadBinder.pluginLabel=JDBC Binder
org.joget.tutorial.JdbcLoadBinder.pluginDesc=Used to load form data using JDBC
form.jdbcLoadBinder.config=Configure JDBC Binder
form.jdbcLoadBinder.datasource=Datasource
form.jdbcLoadBinder.customDatasource=Custom Datasource
form.jdbcLoadBinder.defaultDatasource=Default Datasource
form.jdbcLoadBinder.driver=Custom JDBC Driver
form.jdbcLoadBinder.driver.desc=Eg. com.mysql.jdbc.Driver (MySQL), oracle.jdbc.driver.OracleDriver (Oracle), com.microsoft.sqlserver.jdbc.SQLServerDriver (Microsoft SQL Server)
form.jdbcLoadBinder.url=Custom JDBC URL
form.jdbcLoadBinder.username=Custom JDBC Username
form.jdbcLoadBinder.password=Custom JDBC Password
form.jdbcLoadBinder.sql=SQL SELECT Query
form.jdbcLoadBinder.sql.desc=Use question mark (?) in your query to represent primary key or foreign key
form.jdbcLoadBinder.testConnection=Test Connection
form.jdbcLoadBinder.connectionOk=Database connected
form.jdbcLoadBinder.connectionFail=Not able to establish connection.

e. Register your plugin to Felix Framework

We will have to register our plugin class in Activator class (Auto generated in the same class package) to tell 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(JdbcLoadBinder.class.getName(), new JdbcLoadBinder(), null));
    }

f. Build it and testing

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

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

Let create a form to load firstName, lastName and email from dir_user table based on username to test the load binder.

Then, configure the load binder of the form to use JDBC Binder with the following query.

Code Block

language	sql

 select * from dir_user where username = ?

Let create an userview and drag a Form Menu element to display our form. Then, publish it and test our form with an "id" parameter.

Next, let add a grid element and test with the following query.

Code Block

language	sql

select * from dir_group g 
join dir_user_group ug on ug.groupId = g.id
where ug.userId = ?

Let check our result again.

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You can download the source code from jdbc_load_binder_src.zip.

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

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c. Manage the dependency libraries of your plugin

d. Make your plugin internationalization (i18n) ready

e. Register your plugin to Felix Framework

f. Build it and testing