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The four transaction isolation levels are, in order from weakest to strongest, read uncommitted, read committed, repeatable read, and serializable. Read uncommitted provides no protection against the concurrency issues we have been discussing, but it does provide maximum performance. Read committed insures against dirty reads by never allowing a transaction to read data that have not been committed to the database. Repeatable read also insures against the problem of nonrepeatable reads. Serializable provides complete separation of concurrent transactions by locking all the rows necessary during the entire transaction. Such safety comes at the cost of a significant impact on performance for multiuser applications. Usually the default transaction isolation level is read committed. ACCESSING THE DATABASE PROGRAMMATICALLY Creating a database and accessing it interactively using SQL can be pretty marvelous in itself, but in almost all cases production databases are accessed and updated via programs. The programs present a familiar face to the user, and they conceal all the details of the SQL language. If a user wants to know, for example, who is the RA for Martin Jones, the user shouldn t have to worry about specifying the JOIN statement, or even about what columns appear in what tables. There are many paradigms for programmatic access. The Microsoft approach with the .NET languages is one. The JDBC approach is another. PHP has another. In this chapter we will review JDBC as a neutral approach that is characteristic of the way databases can be accessed from software. In general, a program will create a connection with a database using a user name and password, just as a person would. Then the program will send SQL code to the DBMS. The SQL code is the same as would be issued interactively, but the SQL is stored in character strings inside the program, and then sent to the DBMS for execution. In the case of JDBC, there is also a very first step required, which is to load the driver code for connecting to the database. There are several mechanisms, or types of drivers for JDBC. Some will connect by translating the calls into another standard called open database connection (ODBC); some will convert the JDBC calls into the native application programming interface (API) of the DBMS; some will convert the calls into an independent or vendor-specific network DBMS protocol. One should check with the DBMS administrator for advice about which driver to load for the particular DBMS in use. One can find information about JDBC drivers at: http://industry.java.sun.com/products/jdbc/drivers. A typical snippet of Java code loading a JDBC driver is the following: // Dynamically loads a class called OracleDriver which is in // the file classes12.zip // The environment variable CLASSPATH must be set to include // the directory in which the file classes12.zip exists. Class.forName("oracle.jdbc.driver.OracleDriver"); Once the driver is loaded, the program can establish a connection to the database. The Connection class is available by importing the java.sql.* package. To create a Connection, the program needs a user name and a password, just as a person would. Here is a typical snippet of code to create a Connection object for the database: import java.sql.*; ... // The url means: JDBC driver: Oracle's version: // "thin" driver type, located on cpu reddwarf, // in domain cs.rit.edu, default port number 1521, // database sid "odb" String url="jdbc:oracle:thin:@reddwarf.cs.rit.edu:1521:odb"; // Create a connection object
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// Note that, by default, a connection opens in // auto-commit mode // (every statement is committed individually). Connection con = DriverManager.getConnection(url, dbUser, dbPassword); Once the Connection is established, the program can read from and write to the database by creating a Statement object and supplying the Statement with the SQL code to be executed. For instance: Statement stmt = con.createStatement(); // RETRIEVE STUDENT DATA String query = "SELECT Sname, Dorm, Room, Phone FROM Student"; The Statement object has two methods, one for reading from the database, and one for updating the database. // 1) executeUpdate statements that modify the database // 2) executeQuery SELECT statements (reads) // For a SELECT SQL statement, use the executeQuery method // The query returns a ResultSet object ResultSet rs = stmt.executeQuery(query); Instead of returning a single value, queries return a set of rows. In JDBC, the set of rows is called a ResultSet. To inspect the values in the rows of the ResultSet, use the next() method of the ResultSet to move among the rows, and use the appropriate getter method to retrieve the values. // The ResultSet object is returned // with a cursor pointing above row 1. // The next() method of the ResultSet // moves the cursor to the next row. // The next() method will return FALSE // when the cursor moves beyond the last row. while (rs.next()) { // Note that you must know the datatype of the column // and use the appropriate method to read it: // rs.getString( <"columnName" or indexStartingAtOne> ) // rs.getInt ( <"columnName" or indexStartingAtOne> ) // rs.getFloat ( <"columnName" or indexStartingAtOne> ) // others include getDate, getBoolean, getByte, getLong, // getCharacterStream, getBlob, etc. // These work with lots of lattitude. e.g., you can // read a varchar2 column with getInt, if you know // the characters comprise a number. // getObject will read ANYTHING // getString will read anything and covert it to a String String studentName = rs.getString("Sname"); String studentDorm = rs.getString("Dorm"); int studentRoom = rs.getInt("Room"); String studentPhone = rs.getString("Phone"); System.out.println(studentName + ", " + studentDorm + ", " + studentRoom + ", " + studentPhone); }
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