112 lines
5.2 KiB
HTML
112 lines
5.2 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: ResultSetMetaData interface for IBM Developer Kit for Java" />
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<meta name="DC.Relation" scheme="URI" content="codedisclaimer.htm" />
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<meta name="DC.Relation" scheme="URI" content="rsltdata.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rsmd" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: ResultSetMetaData interface for IBM Developer Kit for Java</title>
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</head>
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<body id="rsmd"><a name="rsmd"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: ResultSetMetaData interface for IBM<sup>®</sup> Developer Kit for Java™</h1>
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<div><div class="section"><p><strong>Note:</strong> Read the <a href="codedisclaimer.htm">Code
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example disclaimer</a> for important legal information.</p>
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<pre>import java.sql.*;
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/**
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ResultSetMetaDataExample.java
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This program demonstrates using a ResultSetMetaData and
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a ResultSet to display all the metadata about a ResultSet
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created querying a table. The user passes the value for the
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table and library in.
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**/
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public class ResultSetMetaDataExample {
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public static void main(java.lang.String[] args)
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{
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if (args.length != 2) {
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System.out.println("Usage: java ResultSetMetaDataExample <library> <table>");
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System.out.println("where <library> is the library that contains <table>");
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System.exit(0);
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}
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Connection con = null;
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Statement s = null;
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ResultSet rs = null;
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ResultSetMetaData rsmd = null;
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try {
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// Get a database connection and prepare a statement.
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Class.forName("com.ibm.db2.jdbc.app.DB2Driver");
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con = DriverManager.getConnection("jdbc:db2:*local");
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s = con.createStatement();
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rs = s.executeQuery("SELECT * FROM " + args[0] + "." + args[1]);
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rsmd = rs.getMetaData();
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int colCount = rsmd.getColumnCount();
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int rowCount = 0;
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for (int i = 1; i <= colCount; i++) {
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System.out.println("Information about column " + i);
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System.out.println(" Name..........: " + rsmd.getColumnName(i));
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System.out.println(" Data Type.....: " + rsmd.getColumnType(i) +
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" ( " + rsmd.getColumnTypeName(i) + " )");
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System.out.println(" Precision.....: " + rsmd.getPrecision(i));
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System.out.println(" Scale.........: " + rsmd.getScale(i));
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System.out.print (" Allows Nulls..: ");
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if (rsmd.isNullable(i)==0)
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System.out.println("false");
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else
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System.out.println("true");
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}
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} catch (Exception e) {
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// Handle any errors.
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System.out.println("Oops... we have an error... ");
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e.printStackTrace();
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} finally {
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// Ensure we always clean up. If the connection gets closed, the
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// statement under it closes as well.
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if (con != null) {
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try {
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con.close();
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} catch (SQLException e) {
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System.out.println("Critical error - cannot close connection object");
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}
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}
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}
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}
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}</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rsltdata.htm" title="The ResultSet object provides several methods for obtaining column data for a row. All are of the form get<Type>, where <Type> is a Java data type. Some examples of these methods include getInt, getLong, getString, getTimestamp, and getBlob. Nearly all of these methods take a single parameter that is either the column index within the ResultSet or the column name.">Retrieve ResultSet data</a></div>
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</div>
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<div class="linklist"><strong>Collected links</strong><br />
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<div><a href="codedisclaimer.htm">Code example disclaimer</a></div></div>
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</div>
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</body>
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</html>
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