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JDBC.pdf - JDBC Outline Definitions Architecture Steps to...

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JDBC Outline Definitions Architecture Steps to connect to the database
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What is JDBC? “An API that lets you access virtually any tabular data source from the Java programming language” JDBC Data Access API – JDBC Technology Homepage What’s an API? What’s a tabular data source? “… access virtually any data source, from relational databases to spreadsheets and flat files .” JDBC Documentation We’ll focus on accessing Oracle databases 2
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General Architecture 3
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4
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Basic steps to use a database in Java 1.Establish a connection 2.Create JDBC Statements 3.Execute SQL Statements 4.GET ResultSet 5.Close connections 5
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1. Establish a connection import java.sql.*; Load the vendor specific driver Class.forName("oracle.jdbc.driver.OracleDriver"); What do you think this statement does, and how? Dynamically loads a driver class, for Oracle database Make the connection Connection con = DriverManager.getConnection ( "jdbc:oracle:thin:@oracle-prod:1521:OPROD", username, passwd); What do you think this statement does? Establishes connection to database by obtaining a Connection object 6
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2. Create JDBC statement(s) Statement stmt = con.createStatement() ; Creates a Statement object for sending SQL statements to the database Types Statement; Use the for general-purpose access to your database. Useful when you are using static SQL statements at runtime. The Statement interface cannot accept parameters.
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