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Java stored procedures are, of course, written using Java, and they facilitate the implementation of data-intensive business logic using Java. These procedures are stored within the database like PL/SQL stored procedures. Java stored procedures can be seen as a link between the Java and non-Java environments.
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A PPEN DI X O RA CLE D AT A BASE 11G S Q L AND PL/S QL: A BRI EF PRIME R
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You can execute Java stored procedures just as you would PL/SQL stored procedures. Here s a summary of the steps involved in creating a Java stored procedure: 1. Define the Java class. 2. Using the Java compiler, compile the new class. 3. Load the class into the Oracle database. You can do this by using the loadjava command-line utility. 4. Publish the Java stored procedure. Once you ve completed these steps, you can invoke the Java stored procedure.
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JDBC is a popular method used to connect to an Oracle database from Java. 10 contains a complete example of a Java program. JDBC provides a set of interfaces for querying databases and processing SQL data in the Java programming language. Listing A-9 shows a simple JDBC program that connects to an Oracle database and executes a simple SQL query. Listing A-9. A Simple JDBC Program import java.sql.*; public class JDBCExample { public static void main(String args[]) throws SQLException /* Declare the type of Oracle Driver you are using */ {DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); /* Create a database connection for the JDBC program */ Connection conn= DriverManager.getConnection( "jdbc:oracle:thin:@nicholas:1521:aparna","hr","hr"); Statement stmt = conn.createStatement(); /* Pass a query to SQL and store the results in the result set rs */ ResultSet rs = stmt.executeQuery("select emp_id, emp_name,salary from employees"); /* Using the while loop, result set rs is accessed row by row */ while(rs.next()){ int number = rs.getInt(1); String name= rs.getString(2); System.out.println(number+" "+name+" "+salary); } /* Close the JDBC result set and close the database connection */ rs.close(); conn.close(); } } JDBC is ideal for dynamic SQL, where the SQL statements aren t known until run time.
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SQLJ is a complementary API to JDBC, and it s ideal for applications in which you re using static SQL (SQL that s known before the execution). Being static, SQLJ enables you to trap errors before they
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APPENDIX ORAC LE DATABA SE 11G S QL A ND PL/SQL: A BRIEF PRIMER
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occur during run time. Keep in mind that even with SQLJ, you still use JDBC drivers to access the database. There are three steps involved in executing a SQLJ program: 1. Create the SQLJ source code. 2. Translate the SQLJ source code into Java source code using a Java compiler. 3. Execute the SQLJ runtime program after you connect to the database. Listing A-10 contains a simple SQLJ example that shows how to execute a SQL statement from within Java. Listing A-10. A Simple SQLJ Program import java.sql.*; import sqlj.runtime.ref.DefaultContext; import oracle.sqlj.runtime.Oracle; /* Declare the variables here */ /* Define an Iterator type to store query results */ #sql iterator ExampleIter (int emp_id, String emp_name,float salary); public class MyExample /* The main method */ { public static void main (String args[]) throws SQLException { /* Establish the database connection for SQLJ */ Oracle.connect ("jdbc:oracle:thin:@shannon:1234:nicholas1", "hr", "hr"); /* Insert a row into the employees table */ #sql { insert into employees (emp_id, emp_name, salary) values (1001, 'Nina Alapati', 50000) }; /* Create an instance of the iterator ExampleIter */ ExampleIter iter; /* Store the results of the select query in the iterator ExampleIter */ #sql iter={ select emp_id, emp_name, salary from employees }; /* Access the data stored in the iterator, using the next() method */ while (iter.next()) { System.out.println (iter.emp_id,()+" "+iter.emp_name()+" "+iter.salary()); } } } As you can see from the SQLJ example in Listing A-10, SQLJ is nothing more than embedded SQL in a Java program. Using SQLJ, you can easily make calls to the database from Java. For a wealth of information on Oracle and Java, please visit Oracle s Java Center web site (http://otn.oracle.com/ tech/java/content.html). This appendix just provided a very brief introduction to the Oracle Database 11g SQL and PL/ SQL capabilities. Although Oracle DBAs aren t always expected be very proficient in SQL and PL/SQL, the more you know about them, the better off you ll be as a professional Oracle DBA.
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