If you are attending an interview related to jdbc, you need to gain knowledge on different aspects of the subject. A simple jdbc application demonstrates the basic elements that jdbc applications need to include. The location of the driver manager with respect to the jdbc drivers and the java application is shown in figure 1. Type 3 driver or network protocol, pure java driver. The driver manager is capable of supporting multiple concurrent drivers connected to multiple heterogeneous databases. If i use step into it seems that the url is being parsed ok for the most part.
Database testing how do you get a database connection. How java applications connect to a data source using the. As part of its initialization, the drivermanager class will attempt to load the driver classes. The driver works fine and mysql is reachable by direct approach means not via java, as root as well as user.
Connecting to a data source using the drivermanager interfacewith the ibm data server driverfor jdbc and sqlj. Jdbc driver contains classes and interfaces that help java application and database. Create the connection using the ibm data server driver for jdbc and sqlj con drivermanager. Properties that contains a set of driver properties for the connection. See properties for the ibm data server driver for jdbc and sqlj for the. As there are serveral possible reasons for the no suitable driver exception to be thrown as far as i can see there is a test for the class loader in drivermanager. The use of a datasource object is the preferred means of connecting to a data source as part of its initialization, the drivermanager class will attempt to load the driver classes referenced in the jdbc. Jdbc program to connect ibm db2 database running on mainframe. I think it was a good idea to think about event loop and so, but from now on i just learnt one. Lets see a list of java jdbc interview questions and their answers with suitable. The url argument represents a data source, and indicates what type of jdbc connectivity you are using. These examples are extracted from open source projects.
Jan 11, 2018 an application connects to a database using database connection apis jdbcodbcetc. Mysql data type to java data type conversion table. I have tried url without any properties and with instance property and with just user and pasword property, i have also tried getconnection with and without password. A jdbc application can establish a connection to a data source using the jdbc drivermanager interface, which is part of the java.
This is now discouraged because of the thin driver. After the driver has been registered with the drivermanager, you can obtain a connection instance that is connected to a particular database by calling drivermanager. We need to create a statement object from above connection object. When getconnection is called the drivermanager will attempt to locate a suitable driver from amongst those loaded at initialization and those loaded explicitly. A jdbc database connection url uniform resource locator provides a way of identifying a database. The second value is the sub protocol and db2 or db2iseries which are used to specify the native jdbc driver. The drivermanager class acts as an interface between user and drivers. That means, if you placed a jar file of jdbc driver for mysql such as mysqlconnectorjava5. The getconnection method of drivermanager class is used to establish the. Db2 11 java example of a simple jdbc application example of a simple jdbc application. The import statements tell the java compiler where to find the classes you reference in your code and are placed at the very beginning of your source code. 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. One way of connecting to a database is through the jdbc driver manager using the method drivermanager. B the java 2 sdk, standard edition, contains the jdbc 2.
Sometimes it just takes another pair of eyes, especially if youve been. This method creates a connection object, which is used to create sql statements, send them to the informix database, and process the results the drivermanager class tracks the available drivers and handles connection requests between appropriate drivers and. The java tm application first loads the jdbc driver by invoking the class. Most of the ibm data server driver for jdbc and sqlj properties apply to all database products that the driver supports.
I want to get connection to a db2 database using the driver com. The following code example uses the jdbc driver manager to connect to db2 while enabling datadirect spy. The appropriate driver from the set of registered jdbc drivers is selected. In java what is the difference between drivermanager. Sometimes it just takes another pair of eyes, especially if youve been staring at the problem for a long time. Sintaxis public static connection getconnectionstring url throws sqlexception public static connection getconnectionstring url, string user, string password throws sqlexception public static connection getconnectionstring url, properties info throws sqlexception. Properties for the ibm data server driver for jdbc and sqlj. Url format for ibm data server driver for jdbc and sqlj type 4. The standard way to obtain a connection object is to call the method drivermanager.
The following is an example of using the jdbc driver manager to connect to advantage database server while passing. Ifi want to user driver mananger, then not within a swing framework otherwise execution from windows would be undefined. For ibm data server driver for jdbc and sqlj type 4 connectivity, the getconnection method must specify a user id and password, through parameters or through property values. Connecting to a data source using the drivermanager. Working with a jdbc connection sql server microsoft docs. The use of a datasource object is the preferred means of connecting to a data source. Specifying the info argument is an alternative to specifying propertyvalue. The jdbc driver manager ensures that the correct driver is used to access each data source. Sqlexception will be thrown, if database access occurs or url is null. Jdbc interview questions a this problem can be caused by running a jdbc applet in a browser that supports the jdk 1. You can click to vote up the examples that are useful to you. Properties for the ibm data server driver for jdbc and. The jdbcodbc bridge driver converts jdbc method calls into the odbc function calls.
The url argument represents a data source, and indicates what type of jdbc connectivity you are using the info argument is an object of type java. A java application using the jdbc api establishes a connection to a database by obtaining a connection object. Connecting to a data source using the drivermanager interface with the db2 universal jdbc driver. When the getconnection method of the drivermanager class is called, an appropriate driver is located from the set of registered jdbc drivers. Connecting to a data source using the drivermanager interface with the ibm data server driver for jdbc and sqlj ibm db2 11.
The following are top voted examples for showing how to use java. Finally, code a call to the drivermanager objects getconnection method to establish actual database connection. You asked a good question and provided a lot of detail. A database table is a collection of uniform records a stored procedure is a database object, which is a set of sql statements that is compiled once and stored on the server. Connecting to a data source using the drivermanager interface.
The jdbcodbc bridge driver uses the odbc driver to connect to the database. The basic service for managing a set of jdbc drivers. An application connects to a database using database connection apis jdbcodbcetc. It keeps track of the drivers that are available and handles establishing a connection between a database and the appropriate driver. Set url for data source connection con drivermanager. Db2 10 java connecting to a data source using the drivermanager interface with the ibm data server driver for jdbc and sqlj. Java drivermanager getconnection method with examples. After the application loads the driver, it connects to a data source by invoking the drivermanager.
The drivermanager class maintains a list of driver classes that have registered themselves by calling the method drivermanager. Test your java jdbc knowledge by answering these tricky interview questions on jdbc. This example shows how you can obtain a connection instance from the drivermanager. There are two special values that can be used to connect to the local database. Once the jdbc driver class is loaded, you are ready to connect to a sql server by using the drivermanager. Jdbc database connections after youve installed the appropriate driver. Passing additional properties using a database url. Questions and answers effective resume writing hr interview questions. This method creates a connection object, which is used to create sql statements, send them to the informix database, and process the results. Now i remove all references to the swing framework, my code works on all solaris, linux and windows. When getconnection is called the drivermanager will attempt to locate a suitable driver from amongst those loaded at initialization and those loaded explicitly using the same classloader as the current applet or application. For the db2 jdbc type 2 driver for linux, unix and windows db2 jdbc type 2 driver, you load the driver by invoking the class. Common ibm data server driver for jdbc and sqlj properties for db2 servers some of the ibm data server driver for jdbc and sqlj properties apply to db2 for zos and db2 for linux, unix, and windows only. Jul 29, 2003 thanks for the url, i am looking into that but also i will like to say that, i have been using the same url in my other programs, the only difference is that the driver was in the class path and the connection strings worked.
There are a few different signatures for the getconnection method. Blob is supported by many databases such as mysql, oracle, and db2 to store. Db2 interview questions data structures interview questions. The following code examples are extracted from open source projects. Top 50 jdbc interview questions and answers career guru99.
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