Jdbc Java Tutorial
Heidi Blessing
The java.sql and javax.sql are the primary packages for JDBC 4.0. This is the latest JDBC version at the time of writing this tutorial. It offers the main classes for interacting with your data sources.
Before proceeding with this tutorial, you should have a good understanding of Java programming language. As you are going to deal with RDBMS, you should have prior exposure to SQL and Database concepts.
The current version of JDBC is 4.3. It is the stable release since 21st September, 2017. It is based on the X/Open SQL Call Level Interface. The java.sql package contains classes and interfaces for JDBC API. A list of popular interfaces of JDBC API are given below:
You can compile Java database programs without the JDBC driver. But to run the JDBC programs, the JDBC driver's JAR-file must be included in the environment variable CLASSPATH, or in the java's command-line option -cp.
Multi threading may be of help, if the lines are uncorrelated, you may start off two processes one reading even lines, another uneven lines, and get your db connection from a connection pool (dbcp) and analyze performance. But first I would investigate whether jdbc is the best approach normally databases have optimized solutions for imports like this. These solutions may also temporarily switch of constraint checking of your table, and turn that back on later, which is also great for performance. As always depending on your requirements.
The fastest way I've found to insert large numbers of records into Oracle is with array operations. See the "setExecuteBatch" method, which is specific to OraclePreparedStatement. It's described in one of the examples here: -array-batch-inserts-with-jdbc
EDIT: One more thought, technically just having a line of code which does Class.forName("com.mysql.jdbc.Driver") should be enough, as the class should have its own static initializer which registers a version, but sometimes a JDBC driver doesn't, so if you aren't sure, there is little harm in registering a second one, it just creates a duplicate object in memeory.
I think the example is wrong - javax.sql.DataSource doesn't have these properties either. Your DataSource needs to be of the type org.apache.derby.jdbc.ClientDataSource, which should have those properties.
The javadoc for DataSource you refer to is of the wrong package. You should look at javax.sql.DataSource. As you can see this is an interface. The host and port name configuration depends on the implementation, i.e. the JDBC driver you are using.
JDBC refers to the Java Database Connectivity. It provides java API that allows Java programs to access database management systems (relational database). The JDBC API consists of a set of interfaces and classes which enables java programs to execute SQL statements. Interfaces and classes in JDBC API are written in java.
This approach provides the users to register the drivers using the in-built class DriverManager available in java.sql package. This acts as a mediator between the Java Application and the target database.
To follow the tutorials, you need to have basic knowledge of Java programming language and know how to interact with PostgreSQL database server such as connecting to the PostgreSQL database server and querying data using the SELECT statement. You are not required to have the JDBC knowledge to understand the code because we will explain each line of code in detail.
For the demonstration purpose, we will use the dvdrental sample database. It is faster and easier to follow the tutorials if you download and load this sample database into your PostgreSQL database server.
This example shows how to create a DataDirect Connect for JDBC DataSource object and register it to a JNDI naming service. The DataSource class provided by the DataDirect Connect for JDBC drivers is database-dependent. In the following example we use Oracle, so the DataSource class is com.ddtek.jdbcx.oracle.OracleDataSource.
The following Java code example creates a data source for DataDirect Connect for JDBC and registers it to a JNDI naming service. The PooledConnectionDataSource class is provided by the DataDirect com.ddtek.pool package. In the following code example, the PooledConnectionDataSource object references a pooled DataDirect Connect for JDBC data source object. Therefore, the example performs a lookup by setting the DataSourceName attribute to the JNDI name of a registered pooled data source (in this example, jdbc/ConnectSparkyOracle, which is the DataDirect Connect for JDBC DataSource object created in section "Creating a DataDirect Data Source Object."
The following Java code example creates a data source for JDBC and registers it to a JNDI naming service. The PooledConnectionDataSource class is provided by the DataDirect com.ddtek.pool package. In the following code example, the PooledConnectionDataSource object references a JDBC data source object. The example performs a lookup by setting the DataSourceName attribute to the JNDI name of a registered pooled data source (in this example, jdbc/SequeLinkSparkyOracle, which is the JDBC DataSource object created in section "Creating a DataDirect Data Source Object").
JDBC API Tutorial and Reference, 3/e is a step-by-step tutorial on the JDBC also includes an exhaustive reference section for all the JDBC API methods, classes and interfaces. The book also includes a tutorial on the new RowSet implementations, including the WebRowSet implementation (Rowsets make it easy to send tabular data over a network). The JDBC API allows developers to take advantage of the Java platform's "Write Once, Run Anywhere" capabilities for industrial strength, cross-platform applications that require access to enterprise data. With a JDBC technology-enabled driver, a developer can easily connect all corporate data even in a heterogeneous environment.
If the console startup procedure is unable to locate the default system web browser,an error message may be displayed. It is possible to explicitly tell H2 whichprogram/script to use when opening a system web browser by setting either the BROWSERenvironment variable, or the h2.browser java property.
In addition to those settings, the properties of the last recently used connectionare listed in the form=using the escape character \.Example:1=Generic H2 (Embedded)org.h2.Driverjdbc\:h2\:/testsa
This code opens a connection (using DriverManager.getConnection()).The driver name is "org.h2.Driver".The database URL always needs to start with jdbc:h2:to be recognized by this database. The second parameter in the getConnection() callis the user name (sa for System Administrator in this example). The third parameter is the password.In this database, user names are not case sensitive, but passwords are.
To use H2 with Glassfish (or Sun AS), set the Datasource Classname toorg.h2.jdbcx.JdbcDataSource. You can set this in the GUIat Application Server - Resources - JDBC - Connection Pools,or by editing the file sun-resources.xml: at elementjdbc-connection-pool, set the attributedatasource-classname to org.h2.jdbcx.JdbcDataSource.
The H2 database is compatible with HSQLDB and PostgreSQL.To take advantage of H2 specific features, use the H2Platform.The source code of this platform is included in H2 atsrc/tools/oracle/toplink/essentials/platform/database/DatabasePlatform.java.txt.You will need to copy this file to your application, and rename it to .java.To enable it, change the following setting in persistence.xml:
When using H2 as the backend database for Apache ActiveMQ, please use the TransactDatabaseLockerinstead of the default locking mechanism. Otherwise the database file will grow without bounds. The problem is that thedefault locking mechanism uses an uncommitted UPDATE transaction, which keeps the transaction logfrom shrinking (causes the database file to grow). Instead of using an UPDATE statement, the TransactDatabaseLocker usesSELECT ... FOR UPDATE which is not problematic.To use it, change the ApacheMQ configuration element element, propertydatabaseLocker="org.apache.activemq.store.jdbc.adapter.TransactDatabaseLocker".However, using the MVCC mode will again result in the same problem. Therefore, please do not use the MVCC mode in this case.Another (more dangerous) solution is to set useDatabaseLock to false.
For details on how to access the database, see the file DbStarter.java.By default this tool opens an embedded connectionusing the database URL jdbc:h2:/test,user name sa, and password sa.If you want to use this connection within your servlet, you can access as follows:
When using Java Web Start / JNLP (Java Network Launch Protocol), permissions tags must be set in the .jnlp file,and the application .jar file must be signed. Otherwise, when trying to write to the file system, the followingexception will occur: java.security.AccessControlException:access denied (java.io.FilePermission ... read).Example permission tags:
This comprehensive tutorial is designed to help software developers understand Java JDBC (Java Database Connectivity), connect to databases, and execute SQL queries. Java JDBC is an API (Application Programming Interface) that allows Java applications to connect to a wide range of relational databases and execute SQL queries. To follow this tutorial, you should have a basic understanding of Java programming.
In this tutorial, you learned how to set up your environment for Java JDBC, connect to databases, and execute SQL queries. With this knowledge, you can create powerful Java applications that interact with relational databases. Keep practicing and experimenting with different SQL queries and JDBC features to become proficient in Java database programming.
From the creators of the JDBC API at JavaSoft, here is the definitive guide to this vital new technology. Appropriate for Java programmers of all skill levels, this book provides explanations of JDBC and Java fundamentals, a step-by-step tutorial to bring you up to speed, and an extensively annotated reference to all JDBC classes and interfaces.
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