JSP 連接數據庫 · W3School Java & Java Web 教程

# JSP 連接數據庫本章節假設您已經對JDBC有一定的了解。在開始學習JSP數據庫訪問前，請確保JDBC環境已經正確配置。首先，讓我們按照下面的步驟來創建一個簡單的表并插入幾條簡單的記錄： ## 創建表在數據庫中創建一個Employees表，步驟如下： ### 步驟1：打開CMD，然后進入數據庫安裝目錄： ``` C:\> C:\>cd Program Files\MySQL\bin C:\Program Files\MySQL\bin> ``` ### 步驟2： ``` C:\Program Files\MySQL\bin>mysql -u root -p Enter password: ******** mysql> ``` ### 步驟3：在TEST數據庫中創建Employee表： ``` mysql> use TEST; mysql> create table Employees ( id int not null, age int not null, first varchar (255), last varchar (255) ); Query OK, 0 rows affected (0.08 sec) mysql> ``` ## 插入數據記錄創建好Employee表后，往表中插入幾條記錄： ``` mysql> INSERT INTO Employees VALUES (100, 18, 'Zara', 'Ali'); Query OK, 1 row affected (0.05 sec) mysql> INSERT INTO Employees VALUES (101, 25, 'Mahnaz', 'Fatma'); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO Employees VALUES (102, 30, 'Zaid', 'Khan'); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO Employees VALUES (103, 28, 'Sumit', 'Mittal'); Query OK, 1 row affected (0.00 sec) mysql> ``` ## SELECT操作接下來的這個例子告訴我們如何使用JSTL SQL標簽來運行SQL SELECT語句： ``` <%@ 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"%> <html> <head> <title>SELECT Operation</title> </head> <body> <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost/TEST" user="root" password="pass123"/> <sql:query dataSource="${snapshot}" var="result"> SELECT * from Employees; </sql:query> <table border="1" width="100%"> <tr> <th>Emp ID</th> <th>First Name</th> <th>Last Name</th> <th>Age</th> </tr> <c:forEach var="row" items="${result.rows}"> <tr> <td><c:out value="${row.id}"/></td> <td><c:out value="${row.first}"/></td> <td><c:out value="${row.last}"/></td> <td><c:out value="${row.age}"/></td> </tr> </c:forEach> </table> </body> </html> ``` 訪問這個JSP例子，運行結果如下： ![mysql-access-1](https://box.kancloud.cn/2015-12-15_566fe70b7f85e.jpg) ## INSERT操作這個例子告訴我們如何使用JSTL SQL標簽來運行SQL INSERT語句： ``` <%@ 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"%> <html> <head> <title>JINSERT Operation</title> </head> <body> <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost/TEST" user="root" password="pass123"/> <sql:update dataSource="${snapshot}" var="result"> INSERT INTO Employees VALUES (104, 2, 'Nuha', 'Ali'); </sql:update> <sql:query dataSource="${snapshot}" var="result"> SELECT * from Employees; </sql:query> <table border="1" width="100%"> <tr> <th>Emp ID</th> <th>First Name</th> <th>Last Name</th> <th>Age</th> </tr> <c:forEach var="row" items="${result.rows}"> <tr> <td><c:out value="${row.id}"/></td> <td><c:out value="${row.first}"/></td> <td><c:out value="${row.last}"/></td> <td><c:out value="${row.age}"/></td> </tr> </c:forEach> </table> </body> </html> ``` 訪問這個JSP例子，運行結果如下： ![mysql-access-2](https://box.kancloud.cn/2015-12-15_566fe70c0246e.jpg) ## DELETE操作這個例子告訴我們如何使用JSTL SQL標簽來運行SQL DELETE語句： ``` <%@ page import="java.io.*,java.util.*,java.sql.*"%> <%@ page import="javax.servlet.http.*,javax.servlet.*" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%> <html> <head> <title>DELETE Operation</title> </head> <body> <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost/TEST" user="root" password="pass123"/> <c:set var="empId" value="103"/> <sql:update dataSource="${snapshot}" var="count"> DELETE FROM Employees WHERE Id = ? <sql:param value="${empId}" /> </sql:update> <sql:query dataSource="${snapshot}" var="result"> SELECT * from Employees; </sql:query> <table border="1" width="100%"> <tr> <th>Emp ID</th> <th>First Name</th> <th>Last Name</th> <th>Age</th> </tr> <c:forEach var="row" items="${result.rows}"> <tr> <td><c:out value="${row.id}"/></td> <td><c:out value="${row.first}"/></td> <td><c:out value="${row.last}"/></td> <td><c:out value="${row.age}"/></td> </tr> </c:forEach> </table> </body> </html> ``` 訪問這個JSP例子，運行結果如下： ![mysql-access-3](https://box.kancloud.cn/2015-12-15_566fe70c7be0d.jpg) ## UPDATE操作這個例子告訴我們如何使用JSTL SQL標簽來運行SQL UPDATE語句： ``` <%@ page import="java.io.*,java.util.*,java.sql.*"%> <%@ page import="javax.servlet.http.*,javax.servlet.*" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%> <html> <head> <title>DELETE Operation</title> </head> <body> <sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost/TEST" user="root" password="pass123"/> <c:set var="empId" value="102"/> <sql:update dataSource="${snapshot}" var="count"> UPDATE Employees SET last = 'Ali' <sql:param value="${empId}" /> </sql:update> <sql:query dataSource="${snapshot}" var="result"> SELECT * from Employees; </sql:query> <table border="1" width="100%"> <tr> <th>Emp ID</th> <th>First Name</th> <th>Last Name</th> <th>Age</th> </tr> <c:forEach var="row" items="${result.rows}"> <tr> <td><c:out value="${row.id}"/></td> <td><c:out value="${row.first}"/></td> <td><c:out value="${row.last}"/></td> <td><c:out value="${row.age}"/></td> </tr> </c:forEach> </table> </body> </html> ``` 訪問這個JSP例子，運行結果如下： ![mysql-access-4](https://box.kancloud.cn/2015-12-15_566fe70cdc19b.jpg)