最简单的基于JSP标准标签库的增删改查

时间：2023-03-08 22:49:23
最简单的基于JSP标准标签库的增删改查

创建数据库中的表：
CREATE TABLE `websites` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` char(20) NOT NULL DEFAULT '' COMMENT '站点名称',
`url` varchar(255) NOT NULL DEFAULT '',
`alexa` int(11) NOT NULL DEFAULT '0' COMMENT 'Alexa 排名',
`country` char(10) NOT NULL DEFAULT '' COMMENT '国家',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;

插入数据：
INSERT INTO `websites` VALUES ('1', 'Google', 'https://www.google.cm/', '1', 'USA'), ('2', '淘宝', 'https://www.taobao.com/', '13', 'CN'), ('3', '百度', 'http://www.baidu.com', '5892', ''), ('4', '微博', 'http://weibo.com/', '20', 'CN'), ('5', '雨落秋垣', 'https://ceet-edu.top/', '3', 'USA');

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ page import="java.io.*,java.util.*,java.sql.*"%>

<%@ page import="javax.servlet.http.*,javax.servlet.*" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>SELECT操作</title>

</head>

<body>

    <!--

        JDBC 驱动名及数据库 URL

        数据库的用户名与密码，需要根据自己的设置

        useUnicode=true&characterEncoding=utf-8 防止中文乱码

     -->

    <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver"

         url="jdbc:mysql://localhost:3306/db_database03?useUnicode=true&characterEncoding=utf-8"

         user="root"  password="359129127"/>

    <sql:query dataSource="${snapshot}" var="result">

    SELECT * from websites;

    </sql:query>

    <h1>JSP 数据库实例 - SELECT操作</h1>

    <table border="1" width="100%">

    <tr>

       <th>ID</th>

       <th>站点名</th>

       <th>站点地址</th>

       <th>操作</th>

    </tr>

    <c:forEach var="row" items="${result.rows}">

    <tr>

       <td><c:out value="${row.id}"/></td>

       <td><c:out value="${row.name}"/></td>

       <td><c:out value="${row.url}"/></td>

       <td>

               <a href="UPDATE操作.jsp">修改</a>

       </td>

    </tr>

    </c:forEach>

    </table>

</body>

</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ page import="java.io.*,java.util.*,java.sql.*"%>

<%@ page import="javax.servlet.http.*,javax.servlet.*" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>DELETE操作</title>

</head>

<body>

        <!--

        JDBC 驱动名及数据库 URL

        数据库的用户名与密码，需要根据自己的设置

        useUnicode=true&characterEncoding=utf-8 防止中文乱码

     -->

    <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver"

         url="jdbc:mysql://localhost:3306/db_database03?useUnicode=true&characterEncoding=utf-8"

         user="root"  password="359129127"/>

    <!--

    删除 ID 为 11 的数据

     -->

    <sql:update dataSource="${snapshot}" var="count">

      DELETE FROM websites WHERE Id = ?

      <sql:param value="${11}" />

    </sql:update>

    <sql:query dataSource="${snapshot}" var="result">

    SELECT * from websites;

    </sql:query>

    <h1>JSP 数据库实例 - DELETE操作</h1>

    <table border="1" width="100%">

    <tr>

       <th>ID</th>

       <th>站点名</th>

       <th>站点地址</th>

    </tr>

    <c:forEach var="row" items="${result.rows}">

    <tr>

       <td><c:out value="${row.id}"/></td>

       <td><c:out value="${row.name}"/></td>

       <td><c:out value="${row.url}"/></td>

    </tr>

    </c:forEach>

    </table>

</body>

</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ page import="java.io.*,java.util.*,java.sql.*"%>

<%@ page import="javax.servlet.http.*,javax.servlet.*" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>INSERT操作</title>

</head>

<body>

    <!--

        JDBC 驱动名及数据库 URL

        数据库的用户名与密码，需要根据自己的设置

        useUnicode=true&characterEncoding=utf-8 防止中文乱码

     -->

    <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver"

         url="jdbc:mysql://localhost:3306/db_database03?useUnicode=true&characterEncoding=utf-8"

         user="root"  password="359129127"/>

    <!--

    插入数据

     -->

    <sql:update dataSource="${snapshot}" var="result">

    INSERT INTO websites (name,url,alexa,country) VALUES ('菜鸟教程移动站', 'http://m.runoob.com', 5093, 'CN');

    </sql:update>

    <sql:query dataSource="${snapshot}" var="result">

    SELECT * from websites;

    </sql:query>

    <h1>JSP 数据库实例 - INSERT操作</h1>

    <table border="1" width="100%">

    <tr>

       <th>ID</th>

       <th>站点名</th>

       <th>站点地址</th>

    </tr>

    <c:forEach var="row" items="${result.rows}">

    <tr>

       <td><c:out value="${row.id}"/></td>

       <td><c:out value="${row.name}"/></td>

       <td><c:out value="${row.url}"/></td>

    </tr>

    </c:forEach>

    </table>

</body>

</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ page import="java.io.*,java.util.*,java.sql.*"%>

<%@ page import="javax.servlet.http.*,javax.servlet.*" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>UPDATE操作</title>

</head>

<body>

    <!--

        JDBC 驱动名及数据库 URL

        数据库的用户名与密码，需要根据自己的设置

        useUnicode=true&characterEncoding=utf-8 防止中文乱码

     -->

    <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver"

         url="jdbc:mysql://localhost:3306/db_database03?useUnicode=true&characterEncoding=utf-8"

         user="root"  password="359129127"/>

    <!--

    修改 ID 为 3 的名字： RUNOOB

     -->

    <c:set var="SiteId" value="3"/>

    <sql:update dataSource="${snapshot}" var="count">

      UPDATE websites SET name = 'RUNOOB' WHERE Id = ?

      <sql:param value="${SiteId}" />

    </sql:update>

    <sql:query dataSource="${snapshot}" var="result">

    SELECT * from websites;

    </sql:query>

    <h1>JSP 数据库实例 - UPDATE操作</h1>

    <table border="1" width="100%">

    <tr>

       <th>ID</th>

       <th>站点名</th>

       <th>站点地址</th>

    </tr>

    <c:forEach var="row" items="${result.rows}">

    <tr>

       <td><c:out value="${row.id}"/></td>

       <td><c:out value="${row.name}"/></td>

       <td><c:out value="${row.url}"/></td>

    </tr>

    </c:forEach>

    </table>

</body>

</html>

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