Jdbc is a java api that is used to connect and execute the query to the database. The jdbc driver manager is a very important class that defines objects which connect java applications to a jdbc driver. Represents the microsoft jdbc driver for sql server. Before you can make a connection to the database you must load the driver. Usually driver manager is the backbone of the jdbc architecture. The programming involved to establish a jdbc connection is fairly simple. This is the driver name for microsoft sql server 2000 driver for jdbc. The drivermanager class takes care of this by automatically locating a suitable driver when the. Establishing jdbc connection in java geeksforgeeks. May 07, 2008 jdbc driver manager there are two ways of connecting to a database one, by using the drivermanager class the traditional way of establishing connection to a database from java and two, by using a data source. You can explicitly load jdbc drivers at any time by using the class. Regarding data bases management create, alter tables, etc.
It is part of the java standard edition platform, from oracle corporation. When getconnection method is called, the drivermanager attempts to locate suitable driver from amongst those which were loaded at initialization and those. Jdbc is a java api that communicates with the database and execute sqlquery. A the jdbc driver converts the java data type to the appropriate jdbc type before sending it to the database. It keeps track of the drivers that are available and handles establishing a connection between a database and the appropriate driver. So you actually are invoking methods on an object of the class that implements the interface. Load jdbc driver every database that can be connected using jdbc api must have a corresponding jdbc driver class that implements java. Java interview questions 1 30 chapter 1 object oriented programming oop java is a computer programming language that is concurrent, classbased and objectoriented. After youve installed the appropriate driver, it is time to establish a database connection using jdbc.
It keeps track of the drivers that are available and handles. Its very simple and small that is used to provide a means of managing the different types of jdbc database driver running on an application. It is traditional management layer of jdbc which works between user and driver. It means that whenever we execute a query and its completed, the commit is fired automatically. With mysql connectorj, the name of this class is com. The static method forname of the class class can be used by drivermanager class to locate and load the drivers listed in system variable jdbc. To register the driver registering the driver instructs jdbc driver manager which driver to load. A jdbc driver is a software component enabling a java application to interact with a database. Lets start learning java jdbc interview questions and prepare for java interviews.
Installing and configuring jdbc the jdbc specification defines an api for the java programming environment that java programmers can use to access relational databases and issue sql statements. Jdbc interview questions jdbc faqs jdbc tutorials jdbc. The drivermanager class acts as an interface between the user and drivers. This section describes how to load a jdbc driver and register it with drivermanager. Jdbc drivermanager class the drivermanager class acts as an interface between user and drivers. Drivermanager class in java, methods of drivermanager class, what is the main use of drivermanager class, drivermanager. The drivermanager class maintains a list of driver classes that have registered themselves by calling the method drivermanager. The ibm toolbox for java jdbc driver registers itself when it is loaded, which is the preferred way to register the driver. Hibernate tomcat jndi datasource example tutorial journaldev. As part of its initialization, the drivermanager class will attempt to load the driver classes referenced in the jdbc. The driver manager also helps to select the most appropriate driver from the previously loaded drivers when a new open database is connected. A this problem can be caused by running a jdbc applet in a browser that supports the jdk 1. Jdbc driver contains classes and interfaces that help java application and database. The loaded jdbc driver class will be automatically registered to drivermanager.
The drivermanager class acts as an interface between user and drivers. Jdbc api can be used to access tabular data stored into any relational database. The jdbc driver manager ensures that the correct driver is used to access each data source. The jdbc driver api, which supports the jdbc manager to driver connection. If you want to use drivermanager class to create a connection to a database server, you need to load a jdbc driver that knows how to create a connection to that database server. Difference between abstract class and interfaces in java with examples 6. Top 50 jdbc interview questions and answers 1 what is the jdbc. When using the ibm toolbox for java driver, use the following syntax. Here we call the constructor of the driver class at compile time.
Jul 05, 2014 1 videos play all jdbc tutorial allinone jdbc tutorial ram n java tutorial oauth 2. Jdbc interview questions, answers for freshers and. Its main function is to manage the set of jdbc drivers. Jdbc api uses jdbc drivers to connect to the database. Add import statements to your java program to import required classes in your java code. The jdbc driver api, which supports the jdbc managertodriver connection. May 10, 2008 you can explicitly load jdbc drivers at any time by using the class. It is a javabased data access technology used for java database connectivity. The main elements of databases are tables, procedures, functions, collections, etc.
The drivers are registered with the drivermanager class either when an instance of driver is created using registerdriver driver driver method of the drivermanager class or drivermanager class is initialized. The driver manager is capable of supporting multiple concurrent drivers connected to multiple heterogeneous databases. This allows a user to customize the jdbc drivers used by their applications. The location of the driver manager with respect to the jdbc drivers and the java application is shown in figure 1. Driver class in the jdbc jar file is used, each driver class should implement a bunch of interfaces specified by sun some are mandatory while others are optional for example each driver class should implement the following. The following is an example of using the jdbc driver manager to connect to advantage database server while passing the user name and password. Dear readers, these jdbc interview questions have been designed specially to get you acquainted with the nature of questions you may encounter during your interview for the subject of jdbc. Jdbc the drivermanager class is responsible for loading the driver specific classes. To load the ibm toolbox for java jdbc driver, add the following to the java program before the first jdbc call. The jdbc driver gives out the connection to the database and implements the protocol for. The jdbc driver manager attempts to locate a driver that can connect to the database that is represented by the url. Top 50 jdbc interview questions and answers career guru99. Although the driver manager can also be used to establish a connection, connecting through a datasource object is the preferred method.
Jdbc drivermanager is a class that manages a list of database drivers. Java database connectivity jdbc is an application programming interface api for the programming language java, which defines how a client may access a database. Net data providers, and ole db providers to connect with individual databases, jdbc the java database connectivity api requires drivers for each database. They install inside the java virtual machine of the client.
Jdbc interview questions and answers facing issues on it. Drivermanager is used for establishing jdbc connections and for managing jdbc drivers. Driver manager class beginners tutorial for java jdbc jsp jboss. How to get the database server details in java program.
Driver manager keeps track of driver available and connection between database and driver. This class includes methods for connecting to a sql server database, and for obtaining information about the jdbc driver. Connect to data source it helps the java program to establish a connection to a data source, such as a database sendingexecuting sql statements once the connection gets established then jdbc can be used to prepare, send, and execute sql queries or update statements on the data source, the. A list of top frequently asked jdbc interview questions and answers is given below.
It matches connection requests from the java application. As per my experience good interviewers hardly plan to ask any particular question during your interview, normally questions start with some basic concept of the subject and later they continue based on. As per my experience good interviewers hardly plan to ask any particular question during your interview, normally questions start with some basic concept of. Your choice will also determine available features. In which ways is driver class is registered with drive manager. Specify to the drivermanager which jdbc drivers to try to make connections with. You can also explicitly register the ibm toolbox for. Driver manager class beginners tutorial for java jdbc. When you run an application that tries to use jdbc, you are prompted for a value called class name. Test your java jdbc knowledge by answering these tricky interview questions on jdbc.
The database or data store stores the data retrieved by the application using the jdbc driver. A datasource object is used to establish connections. Jdbc drivers are clientside adapters installed on the client machine, not on the server that convert requests from java programs to a protocol that the dbms can understand. So the jdbc type 4 driver from oracle will have a concrete class called statement that implements the java. It provides methods to query and update data in a database, and is oriented. Its very simple and small that is used to provide a means of managing the different types of. Java interview questions 1 30 chapter 1 object oriented programming oop java is a computer programming language that is concurrent, class based and objectoriented. The jdbc api uses a driver manager and databasespecific drivers to provide transparent connectivity to heterogeneous databases. One way of connecting to a database is through the jdbc driver manager using the method drivermanager.
Role of drivermanager class and driver interface in java. The drivermanager provides a basic service for managing a set of jdbc drivers. Jdbc technical job interview questions of various companies and by job positions. The jdbc type 4 driver, also known as the direct to database pure java driver, is a database driver implementation that converts jdbc calls directly into a vendorspecific database protocol. Jdbcodbcdriver here, the driver class specified in the string parameter is loaded dynamically at the run time. These are the steps happing inside to get connection step 1. Drivermanager is a java inbuilt class with a static member register. With this method, you could use an external configuration file to supply the. The microsoft jdbc driver jars are not part of the java sdk and must be included. Welcome to the hibernate tomcat jndi datasource example tutorial. Drivermanager will try to load the driver classes mentioned in the system property while the initialization. For more information about which jar file to choose, see system requirements for the jdbc driver.
1315 844 255 637 1037 1385 261 1041 498 162 883 1340 1024 136 827 1136 1428 799 470 1090 338 287 132 768 1025 243 1455 1066 783 1062 1286 1085