Spring Db2 Datasource Example

We will not cover data source configuration in detail in this article, however you can find information about it in Spring Documentation [3]. The active user account must have sufficient rights in DB2. In your db2 control center setup a database that references the remote one. Click System DSN tab and then click the Add button. Both implementations use the same configuration scheme. there is no need of any DB2 Runtime Client. 4:28 AM Eclipse , JDBC , Tomcat No comments The following steps tells how to Configure JDBC Data Resources (JNDI) in Tomcat 7 with DB2 in Ecplise with Example. Spring Boot Starter Projects, Spring Initializr, Creating REST Services, Unit and Integration tests, Profiles, Spring Boot Data JPA, Actuator, and Security. In this tutorials, we are going to show how to integrate Spring Boot H2 Datase using Jdbc Template. If using Spring Initializr to create the project, then use a browser to visit https://start. Spring-Boot's auto-configurer seems good for simple applications. In the following is showed how to integrate JPA in Spring Boot, using Hibernate as JPA implementation and MySQL as database. Spring provides one more data source called SingleConnectionDataSource, as the name suggests, it returns the same connection every time that a connection is requested. A typical example code of connect to database will look like this. Spring Boot version. release the database connections. There are known issues reported by IBM installing the IBM DB2 Data Server Driver on Windows 8. Learn how to setup a database schema for them and also what to configure in application configuration. Set Up Data Sources – Add more data to this data source or prepare your data before you analyze it. Example of obtaining a connection using a DataSource object that was created by the system administrator: In this example, the logical name of the data source that you need to connect to is jdbc/sampledb. The general idea is that a routing DataSource acts as an intermediary - while the real DataSource can be determined dynamically at runtime based upon a lookup key. Spring Batch Tutorial: Reading Information From a File describes how you can read information from CSV and XML files. Select your Spring Boot level (default is 2. username=sa spring. The problem is that when defining a datasource xml, I cannot specify. I want to try it with ODBC but there is a big problem Our application is connected with about 120 databases/libraries on 6 AS400. Creating database-driven web applications in Java has traditionally involved a steep learning curve. All gists Back to GitHub. Host Name or IP Address of The Machine;. UPDATE: take a look to this newer post for how to use MySQL in Spring Boot: Using MySQL In Spring Boot Via Spring Data JPA. On all platforms other than OS/2 and Windows 3. interceptor. 4 currently). This project will be built using Apache Maven. Spring-Boot's auto-configurer seems good for simple applications. In this article we will show how to use spring boot to create a project dependent on database. You can also set up a configuration bean instead of XML config. Spring JdbcTemplate Tutorial with examples, spring aop tutorial, spring dependency injection, spring mvc tutorial, spring jdbctemplate, spring hibernate, spring data jpa, spring remoting. Supported Properties. DataSource interface in conjunction with the Java Naming and Directory Interface (JNDI). The benefit is that because the data source's properties can be changed, any code accessing that data source does not need to be changed. All gists Back to GitHub. In this tutorial, we will learn how to connect to the database and execute CRUD SQL queries using Spring 4 JdbcTemplate. env Here is an example shell script to be included in tomcat's start-up scripts. We could also use an H2 database or other RDBMS like Oracle, Sybase etc. The first argument is 'endOfDayJob. Spring Batch by default uses a database to store metadata on the configured batch jobs. Let’s create a server_ds_config. JPA (Java Persistent API) is the sun specification for persisting objects in the enterprise application. DB2Driver # Keep the connection alive if idle for a long time (needed in production) spring. 여기서는 PostgreSQL, MySQL, H2DB 3개의 각각 다른 DB에 접근하여 간단하게 DB 시스템의 현재 시간을 조회하는 간단한 프로그램을 만들 것 이다. INSERT INTO tbl_book (id, name, price) VALUES (1, 'Spring Boot - Spring Data JPA with Hibernate and H2 Web Console', 0. This update makes it easier for developers to customize and embed custom tools in the Management Center. Why not have a Tulips Theme plus Bridal Mementos?The Tulip is Personal Loans With Bad Credit And No Job a flower that certainly represents the Spring. Data source sample. CLASS OVERHEADS: Selected SQL examples from this book have been rewritten as class overheads. Note: Here we have given examples of mysql database and Oracle database connection. See the EclipseLink Solutions Guide and Understanding EclipseLink (Concepts Guide) for details. jndi-name=java:jboss. @Primary: This annotation indicates that a bean should be given as primary preference when multiple qualified beans were autowired on a single-valued dependency. e using an implementation of the javax. Change the petstore database to enable foreign key constraints. It doesn't know how to infer which database type each is, so if you are configuring multiple different database types in Spring you need to specify the jpa. Learn how to setup a database schema for them and also what to configure in application configuration. In this case, there are none. In this example, we are using MySQL database. UPDATE: take a look to this newer post for how to use MySQL in Spring Boot: Using MySQL In Spring Boot Via Spring Data JPA. The spring-boot-starter-jdbc module transitively pulls tomcat-jdbc-3. In the example, the h2 driver is used, and the driver-name=h2 so its easy to define a datasource. You will need an IBM ID, which you can register for in here. 1 Environment: RHEL 5. Add Web dependency. Use this cookbook as the student notes. By default Spring boot does a lot for you in datasource configuration, but if you’re using two separate database types – DB2, MSSQL, MySQL, Oracle, etc. JNDI Name is the data source name which will be used any applications to connect to the database. JPA Configuration. The most basic of them is using class org. testWhileIdle = true: spring. Build Charts and Analyze Data – Begin your data analysis. You can vote up the examples you like and your votes will be used in our system to generate more good examples. JNDI Lookup in Spring Boot I started using spring boot since last year and pleased with it so far. Environment Properties. This sample demonstrates how to configure multiple datasources with multiple databases and JdbcTemplate in Spring Boot Application. Spring boot with Activiti Example along with MySQL spring-boot-with-activiti-example I have query here, i am trying to connect the above code with mysql. 5, JPA, Hibernate 5, Thymeleaf and H2 database to build a simple Spring Boot multiple datasources web application. Hibernate is a powerful technology for persisting data in any kind of Application. DATE_FORMAT - Convert Date to String - MySQL to IBM DB2 Migration In MySQL, DATE_FORMAT function converts a DATE or DATETIME value to string using the specified format. Creating database-driven web applications in Java has traditionally involved a steep learning curve. In this example, we will retrieve all users from the user1 table in database 1, then append to all users retrieved from user2 table in database 2. Here data source for reader could be flat files[text file, xml file, csv file etc], relational database[e. Include below dependencies in your pom. Since that is not always an option we have a handful of examples for non-pooling datasources listed here as well. How It Works. The other data source creation methods that are listed in this article cause ODBC configuration dialogs boxes to display. On UNIX or Linux, navigate to the IBM DB2 Universal Database server or IBM DB2 Universal Database client sqllib directory, which is located in the IBM DB2 Universal Database instance owner user home directory. We could also use an H2 database or other RDBMS like Oracle, Sybase etc. In the following is showed how to integrate JPA in Spring Boot, using Hibernate as JPA implementation and MySQL as database. Spring Data JPA makes it very easy to implement JPA-based repositories. This is my spring configuration file for datasource:. Spring Data JDBC doesn't directly use the DataSource, but, since the TransactionManager and the NamedParameterJdbcOperations need it, registering it as a bean is an easy way to ensure both use the same instance. The data source has a collection of database connections called a connection pool. If that is not an option, then the Data Access Tool can be used to manually create the packages (the Packages button on the next-to-last page of the New Data Source wizard). This example is using the same 'EndOfDay' example from the domain section. An Example of connecting to DB2 Database using JDBC Driver. boot spring-boot-starter-data-jpa. Simple interface to get a value out of an array Implementation which does the actual work Note the @Transaction annotation on line 22, this is required to ensure that the connection is not closed after the first call on line 42 without this annotation spring would close the connection and the next line 43 would throw an exception. While writing this article, the latest version of spring boot was 1. Let's say we want to call a stored procedures named 'MOVE_TO_HISTORY' which moves a person from 'PERSON' table to 'PERSON_HISTORY' table based on some business logic. html" sections, so that you have a good grounding of the basics. The datasource has been enabled, a user has been added, and validation options have been set. This section addresses the setup and installation of a DB2 audit trail database. We will also see how annotation like @Autowired works in Spring MVC and JDBC CRUD example. 0, the Management Center is updated to use Dynamic HTML (DHTML) and the open source Spring Framework. Spring Boot also lets you configure Flyway using environment variables. For instance, in this article the postgresql will have the models class under com. It can connect to DB2 in Toad and see all tables and schemas. springframework. You can also set up a configuration bean instead of XML config. And, as always, the full project can be found over on GitHub. We demonstrate Spring security using a database by a simple login example. Spring-Boot's auto-configurer seems good for simple applications. You'll also learn how Spring Data JPA and Hibernate can be used with a Microsoft SQL database. The bean definition should look like the example. Introducing database to Spring Batch Until now we have seen Spring batch without its meta data persistence features. Set Up Data Sources - Add more data to this data source or prepare your data before you analyze it. For this sample, the. I'm building a Spring Boot app with Spring Data JPA, the JPA provider being Hibernate, connection pooling with Hikari. The following are top voted examples for showing how to use org. The ColdFusion Administrator organizes information about all ColdFusion server database connections in a single location. where odbcDataSourceName is the name of your data source database. CRUD Restful Web Service with Spring Boot Example; Spring Boot Restful Client with RestTemplate Example; CRUD Example with Spring Boot, REST and AngularJS; Secure Spring Boot RESTful Service using Basic Authentication; Secure Spring Boot RESTful Service using Auth0 JWT; Spring Boot File Upload Example; Spring Boot File Download Example. Here is a cheatsheet with some examples of Datasources configurations which are valid for JBoss AS 7, JBoss EAP 6 and WildFly. Note that the most important parts are the definition of the resource in the application container and the lookup for the JNDI resource on the configuration. Before you can define an ODBC Datasource, you must first configure the database connections to the DB2 Client. Java JDBC DataSource – Database Setup. PoolDataSourceImpl as the data source class along with relevant connection pool properties, such as the initial-pool-size, max-pool-size, etc. Example: spring. Spring Batch provides a solution for batch processing. postgre and mysql under com. A DataSource object has properties that can be modified when necessary. 2 M1 or later. * Note that this is only one example of a usable table structure. Spring: Creating Objects So You Don't Have To : Page 3 As a dependency injection framework (not to mention one of the more popular open source Java projects today), Spring links objects together using XML definitions. Use the following configuration to bootstrap the spring boot application. The ColdFusion Administrator organizes information about all ColdFusion server database connections in a single location. We'll read one of the available records in Student Table by calling a stored function. This page will walk through Spring JDBC example. These examples (except the PL/SQL block at the end of the post) are portable, so they should work with any datasource. Prerequisites. OTD Wizard: Database Connection Information. In this article, we looked at the JDBC abstraction in the Spring Framework, covering the various capabilities provided by Spring JDBC with practical examples. Customer table. HikariCP dependency on the classpath to configure HikariCP connection pooling. Let's create a System DSN source opening the ODBC Data Source Administrator. But that alright. springframework. Spring Boot로 Mybatis 연동시 2개 이상의 DataSource를 연동하는 방법을 알아보자. If you are not familiar with Spring Batch, you should read. html" and "using-spring-boot. Java JDBC connection to DB2 AS400 database example To make a connection to DB2 on AS400 using JDBC we need the following values. @ComponentScan: Tells Spring to look for other components, configurations, and services in the com. When I say meta-data for Spring batch it includes batch related information - a listing of the steps executed, and their audit information, how many items did the framework read/write, did it skip any items, what was the duration. Add Web dependency. This project will be built using Apache Maven. A data source is an object that enables a Java Database Connectivity (JDBC) client to obtain a database connection. The auto-configuration feature provided by the MyBatis-Spring-Boot-Starter used it automatically, but it does not use automatically by a manual configuration (e. JPA) is a Java specification for managing, persisting and accessing data between objects and relation database. We will also see how annotation like @Autowired works in Spring MVC and JDBC CRUD example. 1 as needed) The public health model of prevention addresses health and social issues by classifying prevention in either primary, secondary, and tertiary stage. You will also see how datasource is configured in Spring. On WildFly, you have two ways of installing the JDBC driver: whether you deploy it as any other application package or you install it as a module. Spring JDBC/Dao FAQ: Can you share some Spring JDBC examples, specifically SQL SELECT query examples using Spring Dao objects?. If the name of the RDBMS vendor appears in the dummy. One property that may be required in an environment with container managed transactions is transactionFactoryClass. This document describes how to create a simple web application that connects to a MySQL database server. The last part is to create database models and spring data repository for each data source. Our final project will look like below image. The code in this post is tested with Spring Boot 1. Behind the scenes, DataSourceTransactionManager will work with java. jar) 3) HikariCP 2. xml How to setup multiple data sources with Spring and JPA (Spring forum at Coderanch) FAQs. In this video, I show you how to setup a simple Spring Boot web application which uses a DB2 Express database via Hibernate for persistence. Unpack the archive. It is recommended to use the new DataSource facility to connect to databases and other resources. This is how your application. This is the first part of a series of technical articles about Java and IBM i integration, called "Java and i" (yes, some pun intended). The Spring. Page Content1 Technology Used :2 Dependency3 Flyway Configuration4 Migration Script5 Project Structure6 Spring Boot Application7 Source Code Spring Boot example with Flyway for DB migration. Hi, In SSIS I don't see any data source component to connect to DB2 database. 5, JPA, Hibernate 5, Thymeleaf and H2 database to build a simple Spring Boot multiple datasources web application. JDBC DataSource Example. driver-class-name=com. Our final project will look like below image. If there is a database system that I forgot to add, add a comment and I’ll update the article. IBM DB2 data source example. Basically you just need to configure two DataSource beans in one of your @Configuration classes, and use the @ConfigurationProperties annotation to specify the property prefix used in the application. Spring Batch automates this basic batch iteration, providing the capability to process similar transactions as a set, typically in an offline environment without any user interaction. JDBC DataSource is an interface of package javax. Note that the most important parts are the definition of the resource in the application container and the lookup for the JNDI resource on the configuration. Please consider disabling your ad blocker for Java4s. CLASS OVERHEADS: Selected SQL examples from this book have been rewritten as class overheads. Examples using Maven, Eclipse with Spring 4 Annotations and JUnit Unit Testing. This update makes it easier for developers to customize and embed custom tools in the Management Center. Select your Spring Boot level (default is 2. You can click to vote up the examples that are useful to you. 0 and jQuery 3. For instance, in this article the postgresql will have the models class under com. Build Charts and Analyze Data - Begin your data analysis. Spring + Hibernate Integration. However, feedback from tomcat-user has shown that specifics for individual configurations can be rather tricky. If you are creating a data source to a database on another machine, you will need to adjust accordingly. The following are top voted examples for showing how to use org. INSERT INTO tbl_book (id, name, price) VALUES (1, 'Spring Boot - Spring Data JPA with Hibernate and H2 Web Console', 0. But what about less trivial configuration, when you have several different databases? I found the way to have multiple DataSources for Spring-Boot-based application. We are going to get access these two from our Spring Boot Multiple Data Sources example. You can use the Data Source Wizard to guide you through the steps to configure and save data source information that is required to connect the Data Provider for DB2, ODBC Driver for DB2, BizTalk Adapter for DB2, and ADO. The Spring Data project keeps making it easier to do database access in Spring applications, and one of the neatest improvements of recent times is that by defining an interface which extends JpaRepository and referencing a JPA entity, an implementation will automatically be injected with all the usual CRUD methods: findAll(), findOne(id), save. Spring Batch Boot to read from MySQL database using JdbcCursorItemReader and write to a Flat file using FlatFileItemWriter. Spring also provides utilities for integrating resource management with JDBC and Hibernate. DataSource How do I set the DataSource username/password programmatically? We have a policy not to store credentials in plain text and I have to use a specific credential provider where I work. com, we won't encourage audio ads, popups or any other annoyances at any point, hope you support us. Understand Spring JDBC with Examples. It turned out to be relatively simple to achieve. Spring Data JPA Repositories are also used. Introduction to Our Example Application During this tutorial we will implement several Spring Batch jobs that processes the student information of an online course. In this article, you'll learn how to configure Spring Boot to use Microsoft SQL server database and build a RESTful CRUD API for Employee Management System. DB2 Discuss the public health model of prevention. The name will be used to refer to the database when setting up an URL for the connection. Hopefully, it's possible to override Spring Boot behaviour and define these beans ourself. The datasource has been enabled, a user has been added, and validation options have been set. This approach is similar to JdbcTemplate, but the placeholder (?) replaced by named Read More. Find more information about the IBM DB2 Data Server Driver on Windows 8. However, feedback from tomcat-user has shown that specifics for individual configurations can be rather tricky. It has a lot of customization points, including items like query auto-generation by convention, query hints, and auditing. Spring Boot version = 1. Spring Boot + Spring JPA with PostgreSQL or MySQL or Oracle or SQL Server database and Thymeleaf using Gradle July 02, 2017 Java , Spring Boot Here we will see how to build a sample full stack web application using Spring Boot, Spring JPA with database like PostgreSQL, MySQL or Oracle Thymeleaf and Gradle. Spring Boot + AngularJS + Spring Data + JPA CRUD App Example Created on: December 27, 2016 | Last updated on: September 30, 2017 websystiqueadmin In this post we will be developing a full-blown CRUD application using Spring Boot , AngularJS , Spring Data , JPA/Hibernate and MySQL , learning the concepts in details along the way. You can easily query the same information through the CLI: Using the web console or the CLI greatly simplifies the deployment of JDBC drivers and the creation of datasources. 使用Spring Boot时,默认情况下,配置DataSource非常容易。Spring Boot会自动为我们配置好一个DataSource。 如果在application. To continue these tutorials, we need to do three things: make a bit of a change to the petstore database, download some new libraries, and install two new projects into Eclipse. The beauty of Spring is that it can integrates well with most of the prevailing popular technologies. yml中指定了spring. Introduction to Spring 2 and JPA Explore the Spring 2 framework and the Java Persistence API with Eclipse and DB2 Express-C Skill Level: Introductory Sing Li ([email protected] However, feedback from tomcat-user has shown that specifics for individual configurations can be rather tricky. 0 version, many developers still use XML-based approach. And point the Audit data source to then the audit connection work successful. Spring Boot H2 Database Spring boot provides an in memory database called H2 database, which is mostly usefull while developing the quick POCs and unit level testing. There are known issues reported by IBM installing the IBM DB2 Data Server Driver on Windows 8. The following examples are provided to assist developers with their adoption and usage of EclipseLink's JPA and native ORM functionality. ODBC data sources are stored in the Windows registy. On WildFly, you have two ways of installing the JDBC driver: whether you deploy it as any other application package or you install it as a module. Understand Spring JDBC with Examples. You can also set up a configuration bean instead of XML config. Here is the complete POM file with all of the dependencies that we will need:. when uses multiple DataSource). Prerequisites. We are going to get access these two from our Spring Boot Multiple Data Sources example. Configuring DataSource in Spring Framework In the post Data access in Spring framework it is already discussed in detail that Spring framework uses templates with fixed and call back parts in order to reduce the boiler plate code. Creating data source connections for the Great Outdoors Company package Create the data source connections to the sample databases you restored. Spring Batch automates this basic batch iteration, providing the capability to process similar transactions as a set, typically in an offline environment without any user interaction. You will need an IBM ID, which you can register for in here. If you run a Spring Boot application using the executable jar, you need to use the SpringBootVFS. Setting the JNDI Database Connection pool in Spring and Tomcat is pretty easy. A typical example code of connect to database will look like this. This page will walk through Spring JDBC example. Spring Boot로 Mybatis 연동시 2개 이상의 DataSource를 연동하는 방법을 알아보자. Example: spring. In our application, we want to set multiple data source with Spring and JPA Persistence. See the EclipseLink Solutions Guide and Understanding EclipseLink (Concepts Guide) for details. The database is DB2. Now let's start making our Java. JPA) is a Java specification for managing, persisting and accessing data between objects and relation database. An example given below is an example of BasicDataSourse example. This enables one to use this material to teach DB2 SQL to others. If the value is changed after the connection has been established, and the connection is to a remote data source, the change does not take effect until the next successful db2_connect() for the connection handle. For example, declare a field called dataSource in the servlet like this: @Resource(name = "jdbc/UsersDB") private DataSource dataSource; Tomcat will look up the specified resource name and inject an actual implementation when it discovers this annotation. DB2 ODBC Connection String driver={IBM DB2 ODBC DRIVER};Database=demodb;hostname=myservername;port=myPortNum;protocol=TCPIP; uid=myusername; pwd=mypasswd DB2 OLEDB Connection String. 4 currently). xml How to setup multiple data sources with Spring and JPA (Spring forum at Coderanch) FAQs. password = db2inst1-pwd: spring. And, as always, the full project can be found over on GitHub. Spring 4 JdbcTemplate Annotation Example. How to Configure JDBC Datasource (JNDI) in Tomcat 7 with DB2 in Ecplise Example. This is sort of a follow up post for a previous post of mine - RESTful Web Services Example in Java with Jersey, Spring and MyBatis. Spring Boot will then automatically autowire Flyway with its DataSource and invoke it on startup. Here then are some example configurations that have been posted to tomcat-user for popular databases and some general tips for db usage. In steps 1 and 2, we created a Spring JDBC project with help of Maven. In the above dependencies we have included the JDBC dependency – this gives us JdbcTemplate and other JDBC libraries, the org. Requirement. For an introductory tutorial for the basics of JdbcTemplate, see: Spring JDBC Template Simple Example. From my understanding the bean post processor would be picked up by spring boot for every environment, when looking at the example. In this article, you'll learn how to configure Spring Boot to use Microsoft SQL server database and build a RESTful CRUD API for Employee Management System. In one of my articles, I explained with a simple example on how to secure a Spring MVC application using Spring Security and with Spring Boot for setup. I found no way to set the driver-name on deploy of a jdbc driver other than editing the standalone. We could also use an H2 database or other RDBMS like Oracle, Sybase etc. In this example you will learn how the Spring JDBCTemplate simplifies the code you need to write to perform the database-related operations. From WSAD, you just create a regular datasource and refer to it using the local alias you provided in db2. The example below is an IBM DB2 datasource configuration. All gists Back to GitHub. The basic example above will work for just about any JDBC data source you need to configure for use with Spring Boot. 4 currently). For example, if the data source is moved to a different server, the property for the server can be changed. The following examples are provided to assist developers with their adoption and usage of EclipseLink's JPA and native ORM functionality. This is yet another post of using jdbctemplate to fetch records from DB. Configurations. Using JPA and JTA with Spring Posted on March 15, 2014 by Robert Piasecki When building a web application, we will sooner or later need to somehow store data entered by users and retrieve it later. validationQuery = SELECT 1 # ===== # = JPA / HIBERNATE # ===== # Show or not log for each sql query: spring. It loads the DB2 JDBC Driver and connects to the DB2 database Student and prints the records of the qual table. yml中指定了spring. This is my spring configuration file for datasource:. For example, to configure Spring Batch Admin to use a MySQL data source, you could do the following: Specify mysql as the database type through a VM argument when starting the application. The general idea is that a routing DataSource acts as an intermediary - while the real DataSource can be determined dynamically at runtime based upon a lookup key. For example, if the data source were moved to a different server, all the system administrator would have to do is set the serverName property to the new server name. This section addresses the setup and installation of a DB2 audit trail database. Create Project using Spring Starter Enter group name com. Steps DataSources Examples AutoConfig Semi AutoConfig Static Common Test & Entity 1. Let’s create a simple JDBC DataSource example project and learn how to use MySQL and Oracle DataSource basic implementation classes to get the database connection. Name your project artifact (for example, mydb2jdbcproject). 여기서는 PostgreSQL, MySQL, H2DB 3개의 각각 다른 DB에 접근하여 간단하게 DB 시스템의 현재 시간을 조회하는 간단한 프로그램을 만들 것 이다. 11 HikariCP version = 2. You need to write too much boiler plate code to even execute simple queries and you have to write too much code before and after executing queries. A typical example code of connect to database will look like this. Steps DataSources Examples AutoConfig Semi AutoConfig Static Common Test & Entity 1. The datasource has been enabled, a user has been added, and validation options have been set. These examples are extracted from open source projects. @ComponentScan: Tells Spring to look for other components, configurations, and services in the com. To configure datasource configuration, use the application. In this article, we will show you how to create a Spring Boot + Spring Data JPA + Oracle + HikariCP connection pool example. The API contains the properties Username and Password which are used as the default strings representing the user and password in the connection string. We could also use an H2 database or other RDBMS like Oracle, Sybase etc. The stored DataSource can then be used each time a connection is needed. The DatabaseConfiguration is initialized from the injected datasource and is configured to load the properties from the table TEST_SCHEMA. In this chapter we see how to implement JDBC using Spring boot with MySql database. It is also used to configure other resources like Timers, Topics, Queues. An application can request a connection from the data source, use the connection to access the database, and then close the connection.