10.jstl之SQL:delete_jstl sql获取前台页面并删除-优快云博客

本文演示了如何使用JSTL（Java Server Pages Standard Tag Library）进行数据库操作，包括创建表、插入数据、查询数据及删除数据。通过示例代码，展示了如何使用JSTL的setDataSource、transaction、update、query等标签来实现这些功能。

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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>测试JSTL</title>
	</head>
	
	<body>
		<c:out value="测试JSTL"></c:out>
		
		<sql:setDataSource var="datasource" dataSource="jdbc/sqlserver2008"/>



		<sql:transaction dataSource="${datasource}">

	  <sql:update var="newTable">
	    create table mytable (
	      nameid int primary key,
	      name varchar(80)
	    )
	  </sql:update>

		<h2>插入数据</h2>
	 
	  <sql:update var="updateCount">
	    INSERT INTO mytable VALUES (1,'Paul Oakenfold')
	    INSERT INTO mytable VALUES (2,'Timo Maas')
	    INSERT INTO mytable VALUES (3,'Paul van Dyk')
	  </sql:update>

		<p>完成:插入数据</p>


	  <sql:query var="deejays">
	    SELECT * FROM mytable
	  </sql:query>

	</sql:transaction>

	<table border="1">
	  <c:forEach var="columnName" items="${deejays.columnNames}">
	    <th><c:out value="${columnName}"/></th>
	  </c:forEach>
	
	  <c:forEach var="row" items="${deejays.rows}">
	    <tr>
		    <c:forEach var="column" items="${row}" varStatus="currentVarStaus">
		     	<td><c:out value="${row[deejays.columnNames[currentVarStaus.index]]}"/> </td>
		    </c:forEach>
	    </tr>
	  </c:forEach>
	</table>


	<h2>删除第二行</h2>

	  <sql:update var="updateCount" dataSource="${datasource}">
	    DELETE FROM mytable WHERE nameid=2
	  </sql:update>

	<p>完成:删除第二行</p>

	<sql:query var="deejays" dataSource="${datasource}">
	  SELECT * FROM mytable
	</sql:query>


	<table border="1">
	  <c:forEach var="columnName" items="${deejays.columnNames}">
	    <th><c:out value="${columnName}"/></th>
	  </c:forEach>
	  
	  <c:forEach var="row" items="${deejays.rows}">
	   <tr>            
           <c:forEach items="${row}" var="cuValue" varStatus= "currentVarStaus">        
               <td>  
                   <c:out value="${row[deejays.columnNames[currentVarStaus.index]]}"/>   
               </td>            
           </c:forEach>            
      </tr>        
	  </c:forEach>
	</table>


	<sql:update var="newTable" dataSource="${datasource}">
	  drop table mytable
	</sql:update>

	</body>
</html>