JDBC provides a standard interface for connecting to relational databases from Java applications. It establishes a connection by loading a JDBC driver, then executing SQL statements using objects like Statement and PreparedStatement. Results are retrieved into a ResultSet which can be processed row-by-row. Finally, connections are closed to release resources.
JDBC (Java Database Connectivity) provides Java applications with access to most database systems via SQL. It defines a standard API for accessing databases in Java. The key classes and interfaces in JDBC include DriverManager, Connection, Statement, PreparedStatement, ResultSet, and DatabaseMetaData. JDBC applications use the DriverManager to obtain a Connection to a database, then execute SQL statements using Statement or PreparedStatement objects to return ResultSet objects containing query results.
This document provides an overview of how to access a database in Java using JDBC. It discusses getting a connection to the database, creating statements to execute SQL commands, and using result sets to access query results. It also covers key concepts like prepared statements to prevent SQL injection, design patterns used in JDBC like the factory and iterator patterns, and options for object relational mapping frameworks.
This document provides an overview of Java Database Connectivity (JDBC) and how to use it. It discusses how JDBC works by registering drivers, connecting to databases, and executing SQL statements. It also provides steps for configuring JDBC with Eclipse and Microsoft SQL Server, including downloading drivers and copying files. Examples are given for creating tables, executing queries with the Statement interface, and fetching data from the ResultSet. The document concludes by demonstrating how to properly close resources.
JDBC provides a standard Java API for connecting to different relational databases. It defines four types of JDBC drivers and outlines the basic steps to connect to a database which include defining a connection URL, establishing a connection, creating statements, executing queries, processing results, and closing the connection. The documentation provides examples for connecting to databases like Oracle and MySQL.
JDBC (Java Database Connectivity) is a Java API that allows Java programs to connect to and interact with relational databases. There are four types of JDBC drivers: JDBC-ODBC bridge drivers, native-API drivers, network-protocol drivers, and database-protocol drivers. The key steps in using JDBC include: 1) loading the appropriate JDBC driver, 2) establishing a connection to the database, 3) creating statement objects to execute queries and updates, 4) executing the statements, 5) processing result sets, and 6) closing all open resources.
This document discusses Java Database Connectivity (JDBC) and its components. It describes the two-tier and three-tier JDBC architectures and the roles of the JDBC driver, connection, statement, and result set. It also covers the different types of JDBC drivers and provides code examples to demonstrate how to connect to a database and execute queries using JDBC.
JDBC allows Java programs to connect to databases in a standard way. It provides cross-vendor connectivity and data access across relational databases. The key classes and interfaces in JDBC establish database connections, send SQL statements, and process query results. To use JDBC, a program first loads the appropriate driver, gets a connection, creates statements to execute queries and updates, processes the results, and closes the connection. This allows Java applications to access databases in a uniform manner independent of the underlying database.
JDBC (Java Database Connectivity) provides Java applications with access to most database systems via SQL. It defines a standard API for accessing databases in Java. The key classes and interfaces in JDBC include DriverManager, Connection, Statement, PreparedStatement, ResultSet, and DatabaseMetaData. JDBC applications use the DriverManager to obtain a Connection to a database, then execute SQL statements using Statement or PreparedStatement objects to return ResultSet objects containing query results.
This document provides an overview of how to access a database in Java using JDBC. It discusses getting a connection to the database, creating statements to execute SQL commands, and using result sets to access query results. It also covers key concepts like prepared statements to prevent SQL injection, design patterns used in JDBC like the factory and iterator patterns, and options for object relational mapping frameworks.
This document provides an overview of Java Database Connectivity (JDBC) and how to use it. It discusses how JDBC works by registering drivers, connecting to databases, and executing SQL statements. It also provides steps for configuring JDBC with Eclipse and Microsoft SQL Server, including downloading drivers and copying files. Examples are given for creating tables, executing queries with the Statement interface, and fetching data from the ResultSet. The document concludes by demonstrating how to properly close resources.
JDBC provides a standard Java API for connecting to different relational databases. It defines four types of JDBC drivers and outlines the basic steps to connect to a database which include defining a connection URL, establishing a connection, creating statements, executing queries, processing results, and closing the connection. The documentation provides examples for connecting to databases like Oracle and MySQL.
JDBC (Java Database Connectivity) is a Java API that allows Java programs to connect to and interact with relational databases. There are four types of JDBC drivers: JDBC-ODBC bridge drivers, native-API drivers, network-protocol drivers, and database-protocol drivers. The key steps in using JDBC include: 1) loading the appropriate JDBC driver, 2) establishing a connection to the database, 3) creating statement objects to execute queries and updates, 4) executing the statements, 5) processing result sets, and 6) closing all open resources.
This document discusses Java Database Connectivity (JDBC) and its components. It describes the two-tier and three-tier JDBC architectures and the roles of the JDBC driver, connection, statement, and result set. It also covers the different types of JDBC drivers and provides code examples to demonstrate how to connect to a database and execute queries using JDBC.
JDBC allows Java programs to connect to databases in a standard way. It provides cross-vendor connectivity and data access across relational databases. The key classes and interfaces in JDBC establish database connections, send SQL statements, and process query results. To use JDBC, a program first loads the appropriate driver, gets a connection, creates statements to execute queries and updates, processes the results, and closes the connection. This allows Java applications to access databases in a uniform manner independent of the underlying database.
The document discusses Java Database Connectivity (JDBC) API which defines how Java programs can communicate with databases. It describes key JDBC concepts like drivers, packages, and products. It also covers JDBC design considerations like different types of drivers and client-server models. Basic steps to use JDBC include loading drivers, establishing connections, executing statements, and closing connections.
JDBC is the Java API for connecting to and interacting with relational databases. It includes interfaces and classes that allow Java programs to establish a connection with a database, execute SQL statements, process results, and retrieve metadata. The key interfaces are Driver, Connection, Statement, and ResultSet. A JDBC program loads a JDBC driver, obtains a Connection, uses it to create Statements for querying or updating the database, processes the ResultSet, and closes the connection.
This document discusses Java Database Connectivity (JDBC) which provides a standard interface for connecting Java applications to various databases. It describes the JDBC API and architecture, including the four types of JDBC drivers. The key points are:
1) JDBC provides a standard way for Java programs to access any SQL database. It uses JDBC drivers implemented by database vendors to translate JDBC calls into database-specific protocols.
2) The JDBC API has two layers - an application layer used by developers, and a driver layer implemented by vendors. There are four main interfaces (Driver, Connection, Statement, ResultSet) and the DriverManager class.
3) There are
This document provides an overview of JDBC (Java Database Connectivity) and the different types of JDBC drivers. It discusses the four types of JDBC drivers: Type 1 (JDBC-ODBC bridge), Type 2 (JDBC-Native API), Type 3 (JDBC-Net pure Java), and Type 4 (100% pure Java). It describes the characteristics of each driver type and when each might be used. The document also covers basic JDBC concepts like establishing a database connection, executing statements, and retrieving result sets.
JDBC (Java Database Connectivity) is a standard Java API for connecting to databases. It provides interfaces for tasks like making database connections, executing SQL statements, and retrieving results. There are 4 types of JDBC drivers that implement the JDBC interfaces in different ways. A basic JDBC program imports SQL packages, registers the JDBC driver, gets a database connection, executes SQL statements using a Statement object, extracts result data, and closes resources.
This document provides an overview of connecting to and interacting with databases using JDBC. It begins with database basics, explaining concepts like tables, records, queries, and SQL. It then covers connecting to a database with JDBC, including registering drivers and obtaining a connection. Finally, it discusses querying and manipulating databases with JDBC through executing SQL statements and processing result sets. Examples are provided to demonstrate selecting, updating, and inserting data into databases using JDBC.
This document discusses accessing a database from a Java Server Page (JSP). It begins with an introduction to JSP technology and syntax. It then outlines the steps to connect to a MySQL database from a JSP page, including installing database drivers, creating a database and table, and setting the classpath. The document includes an example JSP program that connects to the books database, executes SQL statements to insert and retrieve data, and displays the results. It closes with a brief explanation of how JDBC is used to manipulate relational data from JSP and references used.
This document provides an overview of using JDBC (Java Database Connectivity) to connect Java applications to relational databases. It discusses downloading and configuring the JDBC driver, executing SQL statements to query and manipulate data, processing result sets, and properly closing connections. Transactions are also introduced to group statements and ensure all succeed or fail together.
This document discusses JDBC (Java Database Connectivity), which is a standard Java API that allows Java programs to connect to databases. It discusses the architecture of JDBC, the four types of JDBC drivers, and the steps to connect to a database which include defining the connection URL, establishing the connection, creating a Statement object, executing queries, processing results, and closing the connection. It also discusses the three types of Statement objects (Statement, PreparedStatement, CallableStatement) and JDBC Data Sources, which provide an alternative to DriverManager and allow connection pooling and distributed transactions.
JDBC (Java Database Connectivity) is an API that provides Java programs with the ability to connect to and interact with databases. It allows database-independent access to different database management systems (DBMS) using Java programming language. JDBC drivers are used to connect to databases and come in four types depending on how they interface with the database. The basic steps to use JDBC include registering a driver, connecting to the database, executing SQL statements, handling results, and closing the connection. Scrollable result sets and prepared statements are also introduced as advanced JDBC features.
Java DataBase Connectivity API (JDBC API)Luzan Baral
JDBC is a Java-based data access technology (Java Standard Edition platform) from Oracle Corporation. This technology is an API for the Java programming language that defines how a client may access a database. It provides methods for querying and updating data in a database. JDBC is oriented towards relational databases. A JDBC-to-ODBC bridge enables connections to any ODBC-accessible data source in the JVM host environment.
This document discusses JDBC (Java Database Connectivity), which provides a standard interface for connecting Java applications to various relational databases. It describes the architecture and types of JDBC drivers, including the steps to connect to a database: loading the appropriate driver class, establishing a connection, creating statements to execute queries, processing result sets, and closing the connection. The types of statements - Statement, PreparedStatement, and CallableStatement - are also outlined. Finally, it introduces JDBC data sources as an alternative to DriverManager that uses JNDI to look up connection information from a naming service.
JDBC provides a standard interface for connecting to and interacting with relational databases in Java. It uses drivers specific to each database vendor to translate JDBC calls to calls native to that database. The key components of JDBC include the DriverManager for loading drivers, Connection for establishing a connection, Statement for executing SQL queries, and ResultSet for accessing the results.
JDBC provides a standard Java API for connecting Java applications to relational databases. It defines interfaces for establishing a connection to a database, sending SQL statements, processing results, and handling errors. There are four types of JDBC drivers that implement the API in different ways, including bridge drivers, native drivers, network protocol drivers, and pure Java drivers.
Java to database connectivity for beginners, Introduction to JDBC, Getting Started with java database programming, What is java database?, core java, java to standard edition, core java, java
This document describes various CSS pseudo-class and pseudo-element selectors including: link-related selectors like :link, :visited, :active, :hover; input-related selectors like :focus, :target, :enabled, :disabled, :checked; position-based selectors like :root, :first-child, :last-child, :nth-child; relational selectors like :not; text-related selectors/elements like :first-letter, :first-line, :before, :after; and how each can be used to select and style elements.
This document defines and provides examples of pseudo-classes and pseudo-elements in CSS. Pseudo-classes are used to define special states of elements, like hover or active states. Dynamic pseudo-classes include :hover, :link, :visited, and :active. Structural pseudo-classes select elements based on their position in the document tree, like :first-child or :nth-child(3). Pseudo-elements like ::first-line or ::before allow creating content that does not exist in the DOM, like generated text.
The document discusses Java Database Connectivity (JDBC) API which defines how Java programs can communicate with databases. It describes key JDBC concepts like drivers, packages, and products. It also covers JDBC design considerations like different types of drivers and client-server models. Basic steps to use JDBC include loading drivers, establishing connections, executing statements, and closing connections.
JDBC is the Java API for connecting to and interacting with relational databases. It includes interfaces and classes that allow Java programs to establish a connection with a database, execute SQL statements, process results, and retrieve metadata. The key interfaces are Driver, Connection, Statement, and ResultSet. A JDBC program loads a JDBC driver, obtains a Connection, uses it to create Statements for querying or updating the database, processes the ResultSet, and closes the connection.
This document discusses Java Database Connectivity (JDBC) which provides a standard interface for connecting Java applications to various databases. It describes the JDBC API and architecture, including the four types of JDBC drivers. The key points are:
1) JDBC provides a standard way for Java programs to access any SQL database. It uses JDBC drivers implemented by database vendors to translate JDBC calls into database-specific protocols.
2) The JDBC API has two layers - an application layer used by developers, and a driver layer implemented by vendors. There are four main interfaces (Driver, Connection, Statement, ResultSet) and the DriverManager class.
3) There are
This document provides an overview of JDBC (Java Database Connectivity) and the different types of JDBC drivers. It discusses the four types of JDBC drivers: Type 1 (JDBC-ODBC bridge), Type 2 (JDBC-Native API), Type 3 (JDBC-Net pure Java), and Type 4 (100% pure Java). It describes the characteristics of each driver type and when each might be used. The document also covers basic JDBC concepts like establishing a database connection, executing statements, and retrieving result sets.
JDBC (Java Database Connectivity) is a standard Java API for connecting to databases. It provides interfaces for tasks like making database connections, executing SQL statements, and retrieving results. There are 4 types of JDBC drivers that implement the JDBC interfaces in different ways. A basic JDBC program imports SQL packages, registers the JDBC driver, gets a database connection, executes SQL statements using a Statement object, extracts result data, and closes resources.
This document provides an overview of connecting to and interacting with databases using JDBC. It begins with database basics, explaining concepts like tables, records, queries, and SQL. It then covers connecting to a database with JDBC, including registering drivers and obtaining a connection. Finally, it discusses querying and manipulating databases with JDBC through executing SQL statements and processing result sets. Examples are provided to demonstrate selecting, updating, and inserting data into databases using JDBC.
This document discusses accessing a database from a Java Server Page (JSP). It begins with an introduction to JSP technology and syntax. It then outlines the steps to connect to a MySQL database from a JSP page, including installing database drivers, creating a database and table, and setting the classpath. The document includes an example JSP program that connects to the books database, executes SQL statements to insert and retrieve data, and displays the results. It closes with a brief explanation of how JDBC is used to manipulate relational data from JSP and references used.
This document provides an overview of using JDBC (Java Database Connectivity) to connect Java applications to relational databases. It discusses downloading and configuring the JDBC driver, executing SQL statements to query and manipulate data, processing result sets, and properly closing connections. Transactions are also introduced to group statements and ensure all succeed or fail together.
This document discusses JDBC (Java Database Connectivity), which is a standard Java API that allows Java programs to connect to databases. It discusses the architecture of JDBC, the four types of JDBC drivers, and the steps to connect to a database which include defining the connection URL, establishing the connection, creating a Statement object, executing queries, processing results, and closing the connection. It also discusses the three types of Statement objects (Statement, PreparedStatement, CallableStatement) and JDBC Data Sources, which provide an alternative to DriverManager and allow connection pooling and distributed transactions.
JDBC (Java Database Connectivity) is an API that provides Java programs with the ability to connect to and interact with databases. It allows database-independent access to different database management systems (DBMS) using Java programming language. JDBC drivers are used to connect to databases and come in four types depending on how they interface with the database. The basic steps to use JDBC include registering a driver, connecting to the database, executing SQL statements, handling results, and closing the connection. Scrollable result sets and prepared statements are also introduced as advanced JDBC features.
Java DataBase Connectivity API (JDBC API)Luzan Baral
JDBC is a Java-based data access technology (Java Standard Edition platform) from Oracle Corporation. This technology is an API for the Java programming language that defines how a client may access a database. It provides methods for querying and updating data in a database. JDBC is oriented towards relational databases. A JDBC-to-ODBC bridge enables connections to any ODBC-accessible data source in the JVM host environment.
This document discusses JDBC (Java Database Connectivity), which provides a standard interface for connecting Java applications to various relational databases. It describes the architecture and types of JDBC drivers, including the steps to connect to a database: loading the appropriate driver class, establishing a connection, creating statements to execute queries, processing result sets, and closing the connection. The types of statements - Statement, PreparedStatement, and CallableStatement - are also outlined. Finally, it introduces JDBC data sources as an alternative to DriverManager that uses JNDI to look up connection information from a naming service.
JDBC provides a standard interface for connecting to and interacting with relational databases in Java. It uses drivers specific to each database vendor to translate JDBC calls to calls native to that database. The key components of JDBC include the DriverManager for loading drivers, Connection for establishing a connection, Statement for executing SQL queries, and ResultSet for accessing the results.
JDBC provides a standard Java API for connecting Java applications to relational databases. It defines interfaces for establishing a connection to a database, sending SQL statements, processing results, and handling errors. There are four types of JDBC drivers that implement the API in different ways, including bridge drivers, native drivers, network protocol drivers, and pure Java drivers.
Java to database connectivity for beginners, Introduction to JDBC, Getting Started with java database programming, What is java database?, core java, java to standard edition, core java, java
This document describes various CSS pseudo-class and pseudo-element selectors including: link-related selectors like :link, :visited, :active, :hover; input-related selectors like :focus, :target, :enabled, :disabled, :checked; position-based selectors like :root, :first-child, :last-child, :nth-child; relational selectors like :not; text-related selectors/elements like :first-letter, :first-line, :before, :after; and how each can be used to select and style elements.
This document defines and provides examples of pseudo-classes and pseudo-elements in CSS. Pseudo-classes are used to define special states of elements, like hover or active states. Dynamic pseudo-classes include :hover, :link, :visited, and :active. Structural pseudo-classes select elements based on their position in the document tree, like :first-child or :nth-child(3). Pseudo-elements like ::first-line or ::before allow creating content that does not exist in the DOM, like generated text.
CSS selectors allow styling of HTML elements based on their type, id, class, and attributes. The main selectors include the universal, type, id, class, attribute, child, sibling, and combinator selectors. CSS rules define the properties and values to apply to the selected elements.
Pseudo-classes are used to define special states of CSS elements. They allow styling elements when a user mouses over, focuses on, visits, or activates them. Common pseudo-classes include :hover, :focus, :visited, and :active. Pseudo-classes can be used with CSS classes and selectors like :first-child to style specific elements, such as styling the first <p> element or changing the color of a link on hover. Pseudo-elements like ::before and ::after allow inserting content before or after elements.
This document provides an introduction to cascading style sheets (CSS) and discusses different CSS types including pseudo classes and pseudo elements. It reviews three methods for applying CSS stylesheets - inline, embedded and separate files. It also covers the order of precedence for different CSS styles and defines class and ID selector styles for formatting HTML elements. Finally, it demonstrates how to use pseudoclasses to style anchor links at different states like unvisited, visited, hover and active.
This document reviews CSS (Cascading Style Sheets) concepts covered in Week 11. CSS is used to control the presentation and styling of HTML documents. There are different types of CSS selectors including element selectors for HTML tags, class selectors that can be applied to any element, and ID selectors that uniquely identify a single element. Styles can be applied via embedded, linked, or inline styles. Linked style sheets allow controlling the presentation of an entire website from one external CSS file.
The document discusses Java Database Connectivity (JDBC) which allows Java applications to connect to databases. It describes the JDBC architecture including drivers, loading drivers, connecting to databases, executing queries and updates using Statement and PreparedStatement objects, processing result sets, and handling exceptions. It also covers transactions, result set metadata, and cleaning up resources.
There are 4 types of JDBC drivers. Database connections can be obtained using the DriverManager or a DataSource. Statements are used to execute SQL queries and updates. PreparedStatements are useful for executing the same statement multiple times with different parameter values. Joins allow querying data from multiple tables.
CSS is used to style and lay out web pages. It allows separation of document content from page layout and design. CSS declarations are made up of selectors and properties. Selectors identify elements on the page and properties set specific styles for those elements, like color, font, size, and layout. CSS rules cascade based on specificity and source, with more specific and inline rules taking precedence over broader and external rules. Inheritance passes down text-based styles by default.
Agile Development | Agile Process ModelsAhsan Rahim
Agile Development | Agile Process Models
Here you are going to know What is Agile Development & What are Agile Process Models for the development of Software Product.
What are different types of Agile Development, steps involve in Agile Development, XP, Scrum, Traditional Process Models with full text and animated description.
Software Process Models defines a distinct set of activities, actions, tasks, milestones, and work products that are required to engineer high-quality software...
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This document summarizes the history and concepts of database connectivity prior to and with the introduction of JDBC and ODBC. It discusses how database connectivity was previously vendor-specific and difficult, and how JDBC and ODBC standardized connectivity through open APIs. It then covers the key aspects of JDBC including its definition, tasks, support for different architectures, and types of JDBC drivers.
JDBC provides a standard interface for connecting to relational databases from Java applications. It establishes a connection with a database, allows sending SQL statements to it, and processing the results. The key classes and interfaces in JDBC are located in the java.sql package. JDBC supports connecting to all major databases and provides a consistent API for database access.
The document discusses Java Database Connectivity (JDBC) and how it allows Java code to execute SQL statements inside relational databases. It covers the JDBC API and how it provides a standard interface to different databases. It also discusses the JDBC-ODBC bridge which allows Java code to access databases via ODBC. The document provides an example of JDBC code to connect to a database, execute a query, and access the result set. It discusses using connection pooling and JNDI lookups in J2EE applications to connect to databases.
The document provides an overview of the Java Database Connectivity (JDBC) API. It discusses that JDBC allows Java applications to connect to relational databases and execute SQL statements. It describes the different types of JDBC drivers and the core JDBC classes like Connection, Statement, ResultSet, and their usage. The steps to connect to a database and execute queries using JDBC are outlined. Key concepts like processing result sets, handling errors, batch processing, stored procedures are also summarized.
JDBC is a Java API that provides interfaces for connecting to and working with databases. It allows Java applications to execute SQL statements and process the results by providing a standard interface for database access that is independent of database vendors. The key classes and interfaces in JDBC include Connection, Statement, PreparedStatement, CallableStatement, and ResultSet. JDBC drivers convert JDBC calls into database-specific protocols to communicate with the database.
Introduction to JDBC and database access in web applicationsFulvio Corno
Introduction to the JDBC standard and best practices for database access from Web Applications.
Materiale realizzato per il corso di Sistemi Informativi Aziendali del Politecnico di Torino - http://bit.ly/sistinfo
This document discusses Java Database Connectivity (JDBC) and the steps to connect to a database using JDBC. It provides an overview of JDBC architecture and its main components. It then outlines the key steps to connect to a database which include: 1) driver registration where the appropriate JDBC driver class is loaded, 2) defining the connection URL, 3) establishing a connection, 4) creating SQL statements, 5) executing queries and processing result sets, and 6) closing the connection. Examples are provided for connecting to MySQL and Derby databases using JDBC.
This document discusses using JDBC to access databases from Java applications like JSP pages. It covers loading the appropriate JDBC driver, establishing a connection with the database using a connection URL, executing SQL statements using Statement objects to retrieve and process result sets, and closing the connection when done. The core steps are to load the driver, get a connection, create statements, execute queries/updates, process results, and close the connection.
This document discusses using JDBC to access databases from Java applications like JSP pages. It covers loading the appropriate JDBC driver, establishing a connection with the database using a connection URL, executing SQL statements using Statement objects to retrieve and process result sets, and closing the connection when done. The core steps are to load the driver, get a connection, create statements, execute queries/updates, process results, and close the connection.
JDBC provides an API for accessing databases from Java that simplifies development, supports metadata access, and allows connection pooling. It includes interfaces for application writers and driver writers, with popular drivers available for databases like Oracle, MySQL, and SQL Server. JDBC drivers can be Type 1 (JDBC-ODBC bridge), Type 2 (partial JDBC), Type 3 (pure Java for middleware), or Type 4 (direct connection).
JDBC stands for Java Database Connectivity and is an API that allows Java programs to execute SQL statements and retrieve results from a database. It uses JDBC drivers to connect to different database types and provides interfaces for establishing a connection, executing queries, and processing result sets. Some common uses of JDBC include building Java applications, applets, servlets, and JSPs that need to access and manipulate data stored in relational databases.
The document discusses the Java Database Connectivity (JDBC) API, which allows Java programs to connect to databases. It describes the basic steps to connect to a database, execute SQL statements, and retrieve and process result sets. It also covers transaction handling, metadata retrieval, and scrollable/updatable result sets.
JDBC is an API that allows Java programs to connect to databases. It provides methods for establishing a connection, executing SQL statements, and retrieving results. The basic steps are to load a database driver, connect to the database, create statements to send queries and updates, get result sets, and close connections. JDBC supports accessing many types of data sources and provides metadata about the database schema.
JDBC provides a standard interface for communication between Java programs and SQL databases, allowing Java programs to execute SQL statements and process the results. It requires loading a JDBC driver, establishing a connection to the database, executing SQL statements via that connection, and processing any results. The document outlines the key JDBC classes, interfaces, and steps for connecting to a database, executing statements, and retrieving and using the results.
JDBC (Java Database Connectivity) provides APIs for Java programs to connect to databases. There are four types of JDBC drivers: Type 1 uses JDBC-ODBC bridge, Type 2 uses a native API, Type 3 is pure Java using a network protocol, and Type 4 is also pure Java using a native database protocol.
To connect to a database using JDBC, a program loads the appropriate JDBC driver, gets a connection, creates statements to execute SQL queries and updates, processes the result set, and closes resources. Prepared statements can be used for repetitive queries to improve performance over regular statements. Overall, JDBC allows Java applications to connect to databases in a standardized way
JDBC (Java Database Connectivity) is an API that provides Java programs with the ability to connect to and interact with databases. It allows database-independent access to different database management systems (DBMS) using Java programming language. JDBC drivers are used to connect to databases and come in four types depending on how they interface with the database. The basic steps to use JDBC include registering a driver, connecting to the database, executing SQL statements, handling results, and closing the connection. Scrollable result sets and prepared statements are also introduced as advanced JDBC features.
This document provides an overview of database connectivity in Java. It discusses how Java applications can connect to databases using the JDBC API. It describes the different types of JDBC drivers (types I-IV) and how they work. The key steps in a JDBC program are outlined, including loading a driver, establishing a connection, creating statements, executing queries, and processing result sets. Common SQL statements like SELECT, INSERT, UPDATE and DELETE are explained. Overall, the document serves as an introduction to using the JDBC API to connect Java applications to various database management systems.
This document provides an overview of Java Database Connectivity (JDBC) including:
- JDBC provides a vendor-neutral way to connect Java applications to databases.
- It describes the basic components and architecture of JDBC including drivers, connections, statements, and result sets.
- It explains how to establish a connection to a database using JDBC including installing drivers, getting connections, executing queries, and processing result sets.
This document provides an overview of using Java Database Connectivity (JDBC) to connect to and interact with relational databases from Java servlets. It describes relational databases and how they organize data into tables. It explains the basic JDBC connection flow of getting a connection, executing SQL statements, and reading results. It also covers key JDBC interfaces like Connection, Statement, and ResultSet. The document provides an example servlet for looking up phone numbers from a database and discusses best practices like reusing connections and using connection pooling.
Database Programming: The Design of JDBC, The Structured Query Language, Basic JDBC Programming Concepts,
Result Sets, Metadata, Row Sets, Transactions
The document provides an overview of J2EE (Java 2 Enterprise Edition) and its core technologies including JDBC, Servlets, JSP, EJB, and RMI. It then discusses JDBC in more detail, explaining the JDBC architecture, drivers, and basic steps to access a database using JDBC including loading drivers, connecting, executing statements, processing results, and closing connections. It also covers PreparedStatement and CallableStatement objects.
2. Contents
Overview
JDBC Model
JDBC Driver Type
JDBC Programming Steps
Step 1 : Loading a JDBC Driver
Step 2 : Connecting to a Database
Step 3 : Executing SQL
Step 4 : Processing the Results
Step 5 : Closing Database Connection
The PreparedStatement Object
Summary
3. Overview
JDBC
JDBC is a standard interface for connecting to relational
databases from Java, was developed by JavSoft.
The JDBC Classes and Interfaces are in the java.sql
package
JDBC is Java API for executing SQL statements
Provides a standard API for tool/database developers
Possible to write database applications using a pure
Java API
Easy to send SQL statements to virtually any relational
database
What does JDBC do?
Establish a connection with a database
Send SQL statements Database
JAVA Applet/ JDBC Call Command
Process the results
Application JDBC Driver Database
4. Overview
Reason for JDBC
Database vendors (Microsoft Access, Oracle
etc.) provide proprietary (non standard) API
for sending SQL to the server and receiving
results from it
Languages such as C/C++ can make use of
these proprietary APIs directly
High performance
Can make use of non standard features of
the database
All the database code needs to be rewritten
if you change database vendor or product
JDBC is a vendor independent API for
accessing relational data from different
database vendors in a consistent way
5. JDBC Driver Type
Drive types are used to categorize the technology used to
connect to the database.
JDBC-ODBC bridge plus ODBC driver (Type 1)
Native-API partly-Java driver (Type 2)
JDBC-Net pure Java driver (Type 3)
Native Protocol pure Java API driver (Type 4)
6.
7. JDBC Programming Steps
1) Register the driver
Connect 2) Create a connection to the database
1) Create a statement
Query 2) Query the database
1) Get a result set
Process Results 2) Assign results to Java variables
1) Close the result set
Close 2) Close the statement
3) Close the connection
8. Skeleton Code
Class.forName(DRIVERNAME); Loading a JDBC driver
Connection con = DriverManager.getConnection(CONNECTIONURL,DBID,DBPASSWORD);
Statement stmt = con.createStatement(); Connecting to a database
ResultSet rs = stmt.executeQuery(“SELECT a, b, c FROM member);
While(rs.next())
{ Executing SQL
Int x = rs.getInt(“a”);
String s = rs.getString(“b”);
Float f = rs.getFloat(“c”); Processing the result set
}
rs.close();
stmt.close();
Closing the connections
con.close();
9. Step 1 : Loading a JDBC Driver
A JDBC driver is needed to connect to a database
Loading a driver requires the class name of the driver.
Ex) JDBC-ODBC: sun.jdbc.odbc.JdbcOdbcDriver
Oracle driver: oracle.jdbc.driver.OracleDriver
MySQL: com.mysql.jdbc.Driver
Loading the driver class
Class.forName("com.mysql.jdbc.Driver");
It is possible to load several drivers.
The class DriverManager manages the loaded driver(s)
10. Step 2 : Connecting to a Database
JDBC URL for a database
Identifies the database to be connected
Consists of three-part:
jdbc:<subprotocol>:<subname>
Protocol: JDBC is
Protocol: JDBC is Sub-protocol:
Sub-protocol: Subname: indicates the location and
Subname: indicates the location and
the only protocol in
the only protocol in identifies a
identifies a name of the database to be
name of the database to be
JDBC
JDBC database
database accessed. Syntax is driver specific
accessed. Syntax is driver specific
driver
driver
Ex) jdbc:mysql://oopsla.snu.ac.kr/mydb
11. Step 2 : Connecting to a Database
The DriverManager allows you to connect to a database
using the specified JDBC driver, database location,
database name, username and password.
It returns a Connection object which can then be used to
communicate with the database.
Connection connection =
DriverManager.getConnection("jdbc:mysql://oopsla.snu.ac.kr/mydb",“userid",“password");
JDBC URL
JDBC URL
Vendor of database, Location of
Vendor of database, Location of Username
Username Password
Password
database server and name of
database server and name of
database
database
12. Step 3 : Executing SQL
Statement object
Can be obtained from a Connection object
Statement statement =
connection.createStatement();
Sends SQL to the database to be executed
Statement has three methods to execute a SQL statement:
executeQuery() for QUERY statements
Returns a ResultSet which contains the query results
executeUpdate() for INSERT, UPDATE, DELETE, or DDL
statements
Returns an integer, the number of affected rows from the SQL
execute() for either type of statement
13. Step 3 : Executing SQL
Execute a select statement
Statement stmt = conn.createStatement();
ResultSet rset = stmt.executeQuery
("select RENTAL_ID, STATUS from ACME_RENTALS");
Execute a delete statement
Statement stmt = conn.createStatement();
int rowcount = stmt.executeUpdate
("delete from ACME_RENTAL_ITEMS
where rental_id = 1011");
14. Step 4 : Processing the Results
JDBC returns the results of a query in a ResultSet object
ResultSet object contains all of the rows which satisfied the
conditions in an SQL statement
A ResultSet object maintains a cursor pointing to its
current row of data
Use next() to step through the result set row by row
next() returns TRUE if there are still remaining records
getString(), getInt(), and getXXX() assign each value to a Java
variable
Internal Pointer ResultSet
Record 1 Record 2 Record 3 Record 4
The internal pointer starts one before the first record
15. Step 4 : Processing the Results
Example
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(“SELECT ID, name, score FROM table1”);
NOTE
You must step the cursor to the first record before read the results
While (rs.next()){
This code will not skip the first record
int id = rs.getInt(“ID”);
String name = rs.getString(“name”);
float score = rs.getFloat(“score”);
System.out.println(“ID=” + id + “ ” + name + “ ” + score);}
ID name score Output
1 James 90.5 ID=1 James 90.5
2 Smith 45.7 ID=2 Smith 45.7
3 Donald 80.2 ID=3 Donald 80.2
Table1
16. Step 5 : Closing Database Connection
It is a good idea to close the Statement and Connection
objects when you have finished with them
Close the ResultSet object
rs.close();
Close the Statement object
stmt.close();
Close the connection
connection.close();
17. The PreparedStatement Object
A PreparedStatement object holds precompiled SQL
statements
Use this object for statements you want to execute more
than once
A PreparedStatement can contain variables (?) that you
// Create the prepared statement the statement
supply each time you execute
PreparedStatement pstmt = con.prepareStatement(“UPDATE
table1 SET status = ? WHERE id =?”)
// Supply values for the variables
pstmt.setString (1, “out”);
pstmt.setInt(2, id);
// Execute the statement
pstmt.executeUpdate();
18. Summary
JDBC
Standard interface for connecting to relational
databases from Java
Vendor independent API for accessing
relational data
JDBC has four driver type
JDBC-ODBC bridge plus ODBC driver
Native-API partly-Java driver
JDBC-Net pure Java driver
Native Protocol pure Java API driver