JDBC"

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m (remove empty version history (via JWB))
 
(31 intermediate revisions by 2 users not shown)
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ZK aims to be as thin as the presentation tier. In addition, as the code executes at the server, so connecting database is no different from any desktop applications. In other words, ZK doesn't change the way you access the database, no matter you use JDBC or other persistence framework, such as [http://www.hibernate.org/ Hibernate].
 
ZK aims to be as thin as the presentation tier. In addition, as the code executes at the server, so connecting database is no different from any desktop applications. In other words, ZK doesn't change the way you access the database, no matter you use JDBC or other persistence framework, such as [http://www.hibernate.org/ Hibernate].
  
=Simplest Way to Use JDBC (but not recommended)=
+
=Use JDBC =
The simplest way to use JDBC, like any JDBC tutorial might suggest, is to use <tt>java.sql.DriverManager</tt>. Here is an example to store the name and email into a [http://www.mysql.com/ MySQL] database.
+
The simplest way to use JDBC, like any JDBC tutorial might suggest, is to use <code>java.sql.DriverManager</code>. Here is an example to store the name and email into a [http://www.mysql.com/ MySQL] database.
 +
 
 +
<source lang="java">
 +
public class JdbcComposer extends SelectorComposer<Window> {
 +
 
 +
private static Logger log = Logger.getLogger(JdbcComposer.class.getName());
 +
@Wire
 +
private Textbox name;
 +
@Wire
 +
private Textbox email;
 +
 
 +
@Listen("onClick = button")
 +
public void submit() {
 +
PreparedStatement stmt = null;
 +
Connection conn = null;
 +
try {
 +
//load driver and get a database connection
 +
Class.forName("com.mysql.jdbc.Driver");
 +
conn = DriverManager.getConnection(
 +
"jdbc:mysql://localhost/test?user=root&password=R3f@ct0r");
 +
stmt = conn.prepareStatement("INSERT INTO user values(?, ?)");
 +
 
 +
//insert what end user entered into database table
 +
stmt.setString(1, name.getValue());
 +
stmt.setString(2, email.getValue());
 +
 
 +
//execute the statement
 +
stmt.executeUpdate();
 +
} catch(Exception e){
 +
log.severe(e.toString());
 +
}finally { //cleanup
 +
if (stmt != null) {
 +
try {
 +
stmt.close();
 +
} catch (SQLException ex) {
 +
log.severe(ex.toString()); //log and ignore
 +
}
 +
}
 +
if (conn != null) {
 +
try {
 +
conn.close();
 +
} catch (SQLException ex) {
 +
log.severe(ex.toString()); //log and ignore
 +
}
 +
}
 +
}
 +
}
 +
}
 +
</source>
 +
 
  
 
<source lang="xml" >
 
<source lang="xml" >
<window title="JDBC demo" border="normal">
+
<window title="JDBC demo" border="normal" apply="org.zkoss.reference.developer.integration.JdbcComposer">
    <zscript><![CDATA[
 
    import java.sql.*;
 
    void submit() {
 
        //load driver and get a database connetion
 
        Class.forName("com.mysql.jdbc.Driver");
 
        Connection conn = DriverManager.getConnection(
 
            "jdbc:mysql://localhost/test?user=root&password=R3f@ct0r");
 
        PreparedStatement stmt = null;
 
        try {
 
            stmt = conn.prepareStatement("INSERT INTO user values(?, ?)");
 
 
            //insert what end user entered into database table
 
            stmt.setString(1, name.value);
 
            stmt.setString(2, email.value);
 
 
            //execute the statement
 
            stmt.executeUpdate();
 
        } finally { //cleanup
 
            if (stmt != null) {
 
                try {
 
                    stmt.close();
 
                } catch (SQLException ex) {
 
                    log.error(ex); //log and ignore
 
                }
 
            }
 
            if (conn != null) {
 
                try {
 
                    conn.close();
 
                } catch (SQLException ex) {
 
                    log.error(ex); //log and ignore
 
                }
 
            }
 
        }
 
    }
 
    ]]>
 
    </zscript>
 
 
     <vbox>
 
     <vbox>
 
         <hbox>Name : <textbox id="name"/></hbox>
 
         <hbox>Name : <textbox id="name"/></hbox>
 
         <hbox>Email: <textbox id="email"/></hbox>
 
         <hbox>Email: <textbox id="email"/></hbox>
         <button label="submit" onClick="submit()"/>
+
         <button label="submit"/>
 
     </vbox>
 
     </vbox>
 
  </window>
 
  </window>
</source>
+
</source>  
+
 
Though simple, it is not recommended. After all, ZK applications are Web-based applications, where loading is unpredictable and treasurable resources such as database connections have to be managed more effectively.
+
Though this way is simple, but it has obvious drawback. After all, ZK applications are web-based applications, where loading is unpredictable and treasurable resources such as database connections have to be managed more effectively.
  
 
Luckily, all J2EE frameworks and Web servers support a utility called connection pooling. It is straightforward to use, while managing the database connections well. We will discuss more in the next section.
 
Luckily, all J2EE frameworks and Web servers support a utility called connection pooling. It is straightforward to use, while managing the database connections well. We will discuss more in the next section.
Line 60: Line 73:
 
<blockquote>
 
<blockquote>
 
----
 
----
'''Tip:''' Unlike other Web applications, it is possible to use <tt>DriverManager</tt> with ZK, though ''not recommended''.
+
'''Tip:''' Unlike other Web applications, it is possible to use <code>DriverManager</code> with ZK, though ''not recommended''.
 
</blockquote>
 
</blockquote>
  
Line 67: Line 80:
 
To know when a desktop becomes invalid, you have to implement a listener by use of <javadoc type="interface">org.zkoss.zk.ui.util.DesktopCleanup</javadoc>.
 
To know when a desktop becomes invalid, you have to implement a listener by use of <javadoc type="interface">org.zkoss.zk.ui.util.DesktopCleanup</javadoc>.
  
= Use with Connection Pooling (recommended)=
+
= Use a Connection Pool=
Connection pooling is a technique for creating and managing a pool of connections that are ready for use by any thread that needs them. Instead of closing a connection immediately, it keeps them in a pool such that the next connection request could be served very efficiently. Connection pooling, in addition, has a lot of benefits, such as control resource usage.
+
Connection pool is a mechanism for creating and managing a pool of connections that are ready to use by a thread that needs them. Instead of closing a connection immediately, it keeps them in a pool such that the next connection request could reuse them. Connection pool, in addition, has a lot of benefits, such as control resource usage.
  
There is no reason not to use connection pooling when developing Web-based applications, including ZK applications.
+
It's recommended to use connection pool if you want to operate Java Connection directly when developing web-based applications, including ZK applications.
  
The concept of using connection pooling is simple: configure, connect and close. The way to connect and close a connection is very similar the ad-hoc approach, while the configuration depends on what Web server and database server are in use.
+
The usage of connection pool is simple: configure, connect and close. The way to connect and close a connection is very similar to the ad-hoc approach, while the configuration depends on what web server and database server are in use.
  
 
== Connect and Close a Connection ==
 
== Connect and Close a Connection ==
After configuring the connection pooling (which will be discussed in the following section), you could use JNDI to retrieve an connection as follows.
+
After configuring the connection pool (which will be discussed in the following section), you could use JNDI to retrieve an connection as follows.
 +
 
 +
<source lang="java">
 +
public class DatasourceComposer extends SelectorComposer<Window> {
 +
 
 +
@Wire
 +
private Textbox name;
 +
@Wire
 +
private Textbox email;
 +
 
 +
@Listen("onClick = button")
 +
public void submit() {
  
<source lang="java" >
+
Connection conn = null;
<window title="JDBC demo" border="normal">
+
PreparedStatement stmt = null;
<zscript><![CDATA[
+
try {
import java.sql.*;
+
DataSource ds = (DataSource) new InitialContext().lookup("java:comp/env/jdbc/MyDB");
import javax.sql.*;
+
conn = ds.getConnection();
import javax.naming.InitialContext;
+
//remember that we specify autocommit as false in the context.xml  
void submit() {
+
conn.setAutoCommit(true);
DataSource ds = (DataSource) new InitialContext()
+
stmt = conn.prepareStatement("INSERT INTO user values(?, ?)");
.lookup("java:comp/env/jdbc/MyDB");
+
stmt.setString(1, name.getValue());
+
stmt.setString(2, email.getValue());
Connection conn = null;
+
stmt.executeUpdate();
PreparedStatement stmt = null;
+
 
try {
+
stmt.close();
conn = ds.getConnection();
+
stmt = null;
//remember that we specify autocommit as false in the context.xml  
+
} catch (SQLException e) {
conn.setAutoCommit(true);
+
try{
stmt = conn.prepareStatement("INSERT INTO user values(?, ?)");
 
stmt.setString(1, name.value);
 
stmt.setString(2, email.value);
 
stmt.executeUpdate();
 
 
stmt.close();
 
stmt = null;
 
} catch (SQLException e) {
 
 
conn.rollback();
 
conn.rollback();
//(optional log and) ignore
+
}catch(SQLException ex){
} finally { //cleanup
+
//log
if (stmt != null) {
+
}
try {
+
//(optional log and) ignore
stmt.close();
+
} catch (Exception e) {
} catch (SQLException ex) {
+
//log
//(optional log and) ignore
+
} finally { //cleanup
}
+
if (stmt != null) {
 +
try {
 +
stmt.close();
 +
} catch (SQLException ex) {
 +
//(optional log and) ignore
 
}
 
}
if (conn != null) {
+
}
try {
+
if (conn != null) {
conn.close();
+
try {
} catch (SQLException ex) {
+
conn.close();
//(optional log and) ignore
+
} catch (SQLException ex) {
}
+
//(optional log and) ignore
 
}
 
}
 
}
 
}
 
}
 
}
]]>
+
}
    </zscript>
+
}
<vbox>
+
</source>
<hbox>Name :<textbox id="name" />
+
 
</hbox>
+
 
<hbox>Email:<textbox id="email" />
+
<source lang="xml" >
</hbox>
+
<window title="JDBC demo" border="normal" apply="org.zkoss.reference.developer.integration.DatasourceComposer">
<button label="submit" onClick="submit()" />
+
    <vbox>
</vbox>
+
        <hbox>Name : <textbox id="name"/></hbox>
</window>
+
        <hbox>Email: <textbox id="email"/></hbox>
 +
        <button label="submit"/>
 +
    </vbox>
 +
</window>
 
</source>
 
</source>
 
   
 
   
Line 135: Line 158:
  
 
* It is important to close the statement and connection after use.
 
* It is important to close the statement and connection after use.
* You could access multiple databases at the same time by the use of multiple connections. Depending on the configuration and J2EE/Web servers, these connections could even form a distributed transaction.
+
* You could access multiple databases at the same time with multiple connections. Depending on the configuration and J2EE/Web servers, these connections could even form a distributed transaction.
  
== Configure Connection Pooling ==
+
== Configure Connection Pool ==
The configuration of connection pooling varies from one J2EE/Web/Database server to another. Here we illustrate some of them. You have to consult the document of the server you are using.
+
The configuration of connection pool varies from one J2EE/Web/Database server to another. Here we illustrate some of them. You have to consult the document of the server you are using.
  
 
=== Tomcat 5.5 (and above) + MySQL ===
 
=== Tomcat 5.5 (and above) + MySQL ===
To configure connection pooling for Tomcat 5.5, you have to edit <tt>$TOMCAT_DIR/conf/context.xml</tt><ref> Thanks Thomas Muller ([http://asconet.org:8000/antville/oberinspector http://asconet.org:8000/antville/oberinspector]) for correction.
+
To configure connection pool for Tomcat 5.5, you have to edit <code>$TOMCAT_DIR/conf/context.xml</code><ref> Thanks Thomas Muller ([http://asconet.org:8000/antville/oberinspector http://asconet.org:8000/antville/oberinspector]) for correction.
  
See also [http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html] and [http://en.wikibooks.org/wiki/ZK/How-Tos/HowToHandleHibernateSessions#Working_with_the_Hibernate_session http://en.wikibooks.org/wiki/ZK/How-Tos/HowToHandleHibernateSessions#Working_with_the_Hibernate_session] for more details.</ref>, and add the following content under the <tt><Context></tt> element. The information that depends on your installation and usually need to be changed is marked in the blue color.
+
See also [http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html] and [http://en.wikibooks.org/wiki/ZK/How-Tos/HowToHandleHibernateSessions#Working_with_the_Hibernate_session http://en.wikibooks.org/wiki/ZK/How-Tos/HowToHandleHibernateSessions#Working_with_the_Hibernate_session] for more details.</ref>, and add the following content under the <code><Context></code> element. The information that depends on your installation and usually need to be changed is marked in the blue color.
  
 
<source lang="xml" >
 
<source lang="xml" >
Line 158: Line 181:
 
</source>
 
</source>
 
   
 
   
Then, in <tt>web.xml</tt>, you have to add the following content under the <tt><web-app></tt> element as follows.
+
Then, in <code>web.xml</code>, you have to add the following content under the <code><web-app></code> element as follows.
  
 
<source lang="xml" >
 
<source lang="xml" >
Line 170: Line 193:
 
'''Notes'''
 
'''Notes'''
 
<references/>
 
<references/>
 +
 +
  
 
=== JBoss + MySQL ===
 
=== JBoss + MySQL ===
 
The following instructions is based on section 23.3.4.3 of the reference manual of MySQL 5.0.
 
The following instructions is based on section 23.3.4.3 of the reference manual of MySQL 5.0.
  
To configure connection pooling for JBoss, you have to add a new file to the directory called deploy (<tt>$JBOSS_DIR/server/default/deploy)</tt>. The file name must end with "<tt>*-ds.xml</tt>" (* means the database, please refer to <tt>$JBOSS_DIR/docs/examples/</tt>), which tells JBoss to deploy this file as JDBC Datasource. The file must have the following contents. The information that depends on your installation and usually need to be changed is marked in the blue color.
+
To configure connection pool for JBoss, you have to add a new file to the directory called deploy (<code>$JBOSS_DIR/server/default/deploy)</code>. The file name must end with "<code>*-ds.xml</code>" (* means the database, please refer to <code>$JBOSS_DIR/docs/examples/jca/</code>), which tells JBoss to deploy this file as JDBC Datasource. The file must have the following contents. The information that depends on your installation and usually need to be changed is marked in the blue color.
  
 +
<code>mysql-ds.xml:</code>
 
<source lang="xml" >
 
<source lang="xml" >
 
  <datasources>
 
  <datasources>
Line 213: Line 239:
 
  </datasources>
 
  </datasources>
 
</source>
 
</source>
 +
 +
To specify the JNDI name at which the datasource is available , you have to add a <code>jboss-web.xml</code> file under the WEB-INF folder.
 +
 +
<code>jboss-web.xml</code>
 +
<source lang="xml">
 +
<jboss-web>
 +
<resource-ref>
 +
    <res-ref-name>jdbc/MyDB</res-ref-name>
 +
    <jndi-name> java:/MyDB </jndi-name>
 +
</resource-ref>
 +
</jboss-web>
 +
</source>
 +
 +
In <code>web.xml</code>, you have to add the following content under the <code><web-app></code> element as follows.
 +
 +
<source lang="xml" >
 +
<resource-ref>
 +
  <res-ref-name>jdbc/MyDB</res-ref-name>
 +
  <res-type>javax.sql.DataSource</res-type>
 +
  <res-auth>Container</res-auth>
 +
</resource-ref>
 +
</source>
 +
 +
  
 
=== JBoss + PostgreSQL ===
 
=== JBoss + PostgreSQL ===
Line 235: Line 285:
 
</source>
 
</source>
  
=Version History=
+
=download=
{{LastUpdated}}
+
*Please download the [https://sourceforge.net/projects/zkforge/files/Small%20Talks/JDBC%28JNDI%20sample%29/Mysql_tomcat.war/download source(Tomcat 5.5 (and above) + MySQL)]
{| border='1px' | width="100%"
+
*Please download the [https://sourceforge.net/projects/zkforge/files/Small%20Talks/JDBC%28JNDI%20sample%29/jboss%2Bmysql.zip/download source(JBoss + MySQL)]
! Version !! Date !! Content
+
 
|-
+
 
| &nbsp;
 
| &nbsp;
 
| &nbsp;
 
|}
 
  
 
{{ZKDevelopersReferencePageFooter}}
 
{{ZKDevelopersReferencePageFooter}}

Latest revision as of 04:34, 5 February 2024

ZK aims to be as thin as the presentation tier. In addition, as the code executes at the server, so connecting database is no different from any desktop applications. In other words, ZK doesn't change the way you access the database, no matter you use JDBC or other persistence framework, such as Hibernate.

Use JDBC

The simplest way to use JDBC, like any JDBC tutorial might suggest, is to use java.sql.DriverManager. Here is an example to store the name and email into a MySQL database.

 
public class JdbcComposer extends SelectorComposer<Window> {

	private static Logger log = Logger.getLogger(JdbcComposer.class.getName());
	@Wire
	private Textbox name;
	@Wire
	private Textbox email;

	@Listen("onClick = button")
	public void submit() {
		PreparedStatement stmt = null;
		Connection conn = null;
		try {
			//load driver and get a database connection
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection(
					"jdbc:mysql://localhost/test?user=root&password=R3f@ct0r");
			stmt = conn.prepareStatement("INSERT INTO user values(?, ?)");

			//insert what end user entered into database table
			stmt.setString(1, name.getValue());
			stmt.setString(2, email.getValue());

			//execute the statement
			stmt.executeUpdate();
		} catch(Exception e){
			log.severe(e.toString());
		}finally { //cleanup
			if (stmt != null) {
				try {
					stmt.close();
				} catch (SQLException ex) {
					log.severe(ex.toString()); //log and ignore
				}
			}
			if (conn != null) {
				try {
					conn.close();
				} catch (SQLException ex) {
					log.severe(ex.toString()); //log and ignore
				}
			}
		}
	}	
}


<window title="JDBC demo" border="normal" apply="org.zkoss.reference.developer.integration.JdbcComposer">
     <vbox>
         <hbox>Name : <textbox id="name"/></hbox>
         <hbox>Email: <textbox id="email"/></hbox>
         <button label="submit"/>
     </vbox>
 </window>

Though this way is simple, but it has obvious drawback. After all, ZK applications are web-based applications, where loading is unpredictable and treasurable resources such as database connections have to be managed more effectively.

Luckily, all J2EE frameworks and Web servers support a utility called connection pooling. It is straightforward to use, while managing the database connections well. We will discuss more in the next section.


Tip: Unlike other Web applications, it is possible to use DriverManager with ZK, though not recommended.

First, you could cache the connection in the desktop, reuse it for each event, and close it when the desktop becomes invalid. It works just like traditional Client/Server applications. Like Client/Server applications, it works efficiently only if there are at most tens concurrent users.

To know when a desktop becomes invalid, you have to implement a listener by use of DesktopCleanup.

Use a Connection Pool

Connection pool is a mechanism for creating and managing a pool of connections that are ready to use by a thread that needs them. Instead of closing a connection immediately, it keeps them in a pool such that the next connection request could reuse them. Connection pool, in addition, has a lot of benefits, such as control resource usage.

It's recommended to use connection pool if you want to operate Java Connection directly when developing web-based applications, including ZK applications.

The usage of connection pool is simple: configure, connect and close. The way to connect and close a connection is very similar to the ad-hoc approach, while the configuration depends on what web server and database server are in use.

Connect and Close a Connection

After configuring the connection pool (which will be discussed in the following section), you could use JNDI to retrieve an connection as follows.

public class DatasourceComposer extends SelectorComposer<Window> {

	@Wire
	private Textbox name;
	@Wire
	private Textbox email;

	@Listen("onClick = button")
	public void submit() {

		Connection conn = null;
		PreparedStatement stmt = null;
		try {
			DataSource ds = (DataSource) new InitialContext().lookup("java:comp/env/jdbc/MyDB");
			conn = ds.getConnection();
			//remember that we specify autocommit as false in the context.xml 
			conn.setAutoCommit(true);
			stmt = conn.prepareStatement("INSERT INTO user values(?, ?)");
			stmt.setString(1, name.getValue());
			stmt.setString(2, email.getValue());
			stmt.executeUpdate();

			stmt.close();
			stmt = null;
		} catch (SQLException e) {
			try{
				conn.rollback();
			}catch(SQLException ex){
				//log
			}
			//(optional log and) ignore
		} catch (Exception e) {
			//log
		} finally { //cleanup
			if (stmt != null) {
				try {
					stmt.close();
				} catch (SQLException ex) {
					//(optional log and) ignore
				}
			}
			if (conn != null) {
				try {
					conn.close();
				} catch (SQLException ex) {
					//(optional log and) ignore
				}
			}
		}
	}	
}


<window title="JDBC demo" border="normal" apply="org.zkoss.reference.developer.integration.DatasourceComposer">
     <vbox>
         <hbox>Name : <textbox id="name"/></hbox>
         <hbox>Email: <textbox id="email"/></hbox>
         <button label="submit"/>
     </vbox>
 </window>

Notes:

  • It is important to close the statement and connection after use.
  • You could access multiple databases at the same time with multiple connections. Depending on the configuration and J2EE/Web servers, these connections could even form a distributed transaction.

Configure Connection Pool

The configuration of connection pool varies from one J2EE/Web/Database server to another. Here we illustrate some of them. You have to consult the document of the server you are using.

Tomcat 5.5 (and above) + MySQL

To configure connection pool for Tomcat 5.5, you have to edit $TOMCAT_DIR/conf/context.xml[1], and add the following content under the <Context> element. The information that depends on your installation and usually need to be changed is marked in the blue color.

 <!-- The name you used above, must match _exactly_ here!
     The connection pool will be bound into JNDI with the name
     "java:/comp/env/jdbc/MyDB"
 -->
 <Resource name="jdbc/MyDB" username="someuser" password="somepass" 
     url="jdbc:mysql://localhost:3306/test" 
     auth="Container" defaultAutoCommit="false" 
     driverClassName="com.mysql.jdbc.Driver" maxActive="20" 
     timeBetweenEvictionRunsMillis="60000" 
     type="javax.sql.DataSource" />

Then, in web.xml, you have to add the following content under the <web-app> element as follows.

 <resource-ref>
   <res-ref-name>jdbc/MyDB</res-ref-name>
   <res-type>javax.sql.DataSource</res-type>
   <res-auth>Container</res-auth>
 </resource-ref>

Notes


JBoss + MySQL

The following instructions is based on section 23.3.4.3 of the reference manual of MySQL 5.0.

To configure connection pool for JBoss, you have to add a new file to the directory called deploy ($JBOSS_DIR/server/default/deploy). The file name must end with "*-ds.xml" (* means the database, please refer to $JBOSS_DIR/docs/examples/jca/), which tells JBoss to deploy this file as JDBC Datasource. The file must have the following contents. The information that depends on your installation and usually need to be changed is marked in the blue color.

mysql-ds.xml:

 <datasources>
     <local-tx-datasource>
         <!-- This connection pool will be bound into JNDI with the name
              "java:/MyDB" -->
         <jndi-name>MyDB</jndi-name>
         <connection-url>jdbc:mysql://localhost:3306/test</connection-url>
         <driver-class>com.mysql.jdbc.Driver</driver-class>
         <user-name>someuser</user-name>
         <password>somepass</password>

         <min-pool-size>5</min-pool-size>

         <!-- Don't set this any higher than max_connections on your
          MySQL server, usually this should be a 10 or a few 10's
          of connections, not hundreds or thousands -->

         <max-pool-size>20</max-pool-size>

         <!-- Don't allow connections to hang out idle too long,
          never longer than what wait_timeout is set to on the
          server...A few minutes is usually okay here,
          it depends on your application
          and how much spikey load it will see -->

         <idle-timeout-minutes>5</idle-timeout-minutes>

         <!-- If you're using Connector/J 3.1.8 or newer, you can use
              our implementation of these to increase the robustness
              of the connection pool. -->

         <exception-sorter-class-name>com.mysql.jdbc.integration.jboss.ExtendedMysqlExceptionSorter</exception-sorter-class-name>
         <valid-connection-checker-class-name>com.mysql.jdbc.integration.jboss.MysqlValidConnectionChecker</valid-connection-checker-class-name>

     </local-tx-datasource>
 </datasources>

To specify the JNDI name at which the datasource is available , you have to add a jboss-web.xml file under the WEB-INF folder.

jboss-web.xml

<jboss-web>
<resource-ref> 
    <res-ref-name>jdbc/MyDB</res-ref-name> 
    <jndi-name> java:/MyDB </jndi-name> 
</resource-ref>
</jboss-web>

In web.xml, you have to add the following content under the <web-app> element as follows.

 <resource-ref>
   <res-ref-name>jdbc/MyDB</res-ref-name>
   <res-type>javax.sql.DataSource</res-type>
   <res-auth>Container</res-auth>
 </resource-ref>


JBoss + PostgreSQL

 <datasources>
     <local-tx-datasource>
     <!-- This connection pool will be bound into JNDI with the name
          "java:/MyDB" -->
     <jndi-name>MyDB</jndi-name>

     <!-- jdbc:postgresql://[servername]:[port]/[database name] -->
     <connection-url>jdbc:postgresql://localhost/test</connection-url>

     <driver-class>org.postgresql.Driver</driver-class>
     <user-name>someuser</user-name>
     <password>somepass</password>
     <min-pool-size>5</min-pool-size>
     <max-pool-size>20</max-pool-size>
     <track-statements>false</track-statements>
     </local-tx-datasource>
 </datasources>

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Last Update : 2024/02/05

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