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rset = stmtexecuteQuery("SELECT pi() AS output"); rsetnext(); float pival = rsetgetFloat("output"); Systemoutprintln("pi: " + pival); rsetclose(); stmtclose(); sqlconclose(); } catch (Exception e) { Systemoutprintln("Problem: " + egetMessage()); } } }
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After successfully establishing a connection to the database, the GetValsjava program sends a query using the PostgreSQL timeofday() function The result is retrieved using a ResultSet object As mentioned earlier, you must first perform a next() method to get to the first record in the result set If you attempt to retrieve data from the result set before doing this, you will get a Java exception After getting to the first record, you can read the data using the JDBC getxxx() methods The getxxx() methods allow you to extract data from the result set record using either the integer column number (which starts at 1 for the first column) or the column name (as a case-insensitive String value) The GetValsjava program demonstrates using both methods Note that for a function, unless the SELECT AS keyword is used, you can only reference the column by number The JDBC allows you to extract any PostgreSQL data type as a String value using the getString() method, and will automatically convert the PostgreSQL data type to a string For advanced data processing, you can match the appropriate Java data type to the PostgreSQL data type (such as getInt(), getFloat(), or getDate()) This allows you to directly handle data retrieved from the result set in equations Compiling and running the program produces the following results:
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C:\test>javac GetValsjava C:\test>java -classpath c:\test;c:\test\postgresql-81-405jdbc3jar GetVals connected to database time: Tue Oct 10 19:12:53992000 2006 EDT pi: 31415927 C:\test>
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When using a ResultSet object to process result sets that contain multiple records, you must loop through the result set records using the next() method The next() method will return a TRUE Boolean value while there is another record to retrieve If you are at
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the end of the result set, the next() method will return a FALSE value The easiest way to loop through result set data is to use a while() loop:
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while(rsetnext()) { }
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When the last record has been processed, the while() loop exits This is demonstrated in the GetBiddersjava program:
import javasql*; public class GetBidders { private String URL = "jdbc:postgresql://127001/test"; private String user = "earl"; private String passwd = "auction"; private Connection sqlcon = null; private Statement sqlstmt = null; private ResultSet sqlrset = null; public GetBidders() { String output, lastname, firstname; int bidderid; try { ClassforName("orgpostgresqlDriver"); sqlcon = DriverManagergetConnection(URL, user, passwd); } catch (Exception e) { Systemoutprintln("Problem: " + egetMessage()); Systemexit(1); } try { sqlstmt = sqlconcreateStatement(); sqlrset = sqlstmtexecuteQuery("Select * from auctionbidder"); while (sqlrsetnext()) { bidderid = sqlrsetgetInt("bidderkey"); lastname = sqlrsetgetString("lastname"); firstname = sqlrsetgetString("firstname"); output = bidderid + " - " + lastname + "," + firstname; Systemoutprintln(output); } sqlstmtclose();
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} catch (Exception e) { Systemoutprintln("Problem: " + egetMessage()); } } public static void main(String[] args) { GetBidders tst = new GetBidders(); } }
The GetBiddersjava program also demonstrates an alternative way of creating a Java application The program code is defined in a class constructor:
public GetBidders { }
Since the program is in the class constructor, the main() method (which is automatically run by the JVM by default) must create an instance of the class:
public static void main(String[] args) { GetBidders tst = new GetBidders(); }
When the new instance is created, the program code in the constructor is executed The program uses the standard methods for loading the JDBC driver and connecting to the PostgreSQL server Next, the SELECT query is sent using the executeQuery() method Data in the ResultSet object is processed within the while() loop For each record, the bidderkey, lastname, and firstname columns are extracted, based on their column names
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