📄 resultsetmetadata_test.jsp

📁 此资源是jsp应用开发邓子云等编写的一书里的源代码

💻 JSP

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<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@ page import="java.sql.*,javax.naming.*,javax.sql.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>结果集元数据</title>
  </head>  
  <body>
  <%
   Connection con = null;
   Statement stmt = null;
   ResultSet rs = null;
   
	try {
			// 通过连接池来获得一个连接
			Context initContext = new InitialContext();
			Context envContext  = (Context)initContext.lookup("java:/comp/env");
			DataSource ds = (DataSource)envContext.lookup("jdbc/sqlserver");
			con = ds.getConnection();
			stmt = con.createStatement();
			String querySQL1 = "select * from student";
			rs = stmt.executeQuery(querySQL1);

			// 提取结果集的元数据：
			ResultSetMetaData rsmd = rs.getMetaData();
			int colCount = rsmd.getColumnCount();
			String[] columnNames = new String[colCount];
			String[] columnLabels = new String[colCount];
			int[] columnTypes = new int[colCount];

			for (int i = 0; i < colCount; i++) {
				columnNames[i] = rsmd.getColumnName(i + 1);
				columnLabels[i] = rsmd.getColumnLabel(i + 1);
				columnTypes[i] = rsmd.getColumnType(i + 1);
			}			
			out.println("<h2>结果集的元数据如下：</h2>");
			out.println("<h2>----------------------</h2>");
			out.println("列名：");
			for (int i = 0; i < colCount; i++) {
				out.print(columnLabels[i] + "\t");
			}
			out.println("<br>");
			out.println("列标签：");
			for (int i = 0; i < colCount; i++) {
				out.print(columnNames[i] + "\t");
			}		
			
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				// 用完后要关闭连接，释放资源
				if (con != null)
					con.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
   %>    
  </body>
</html>

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