jsp 连接数据库
<%@ page language="java" import="com.mchange.v2.c3p0.*"
import="java.sql.*" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<!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=gbk">
<title>加载包的形式使用c3p0连接池</title>
</head>
<body>
<%
Connection con=null;
Statement stmt=null;
ResultSet rs=null;
try{
//创建数据源对象
ComboPooledDataSource cpds=new ComboPooledDataSource();
cpds.setDriverClass("com.mysql.jdbc.Driver");
cpds.setJdbcUrl("jdbc:mysql://localhost:3306/bookdb");
cpds.setUser("root");
cpds.setPassword("888");
//通过数据源得到连接对象
con=cpds.getConnection();
//得到命令对象
stmt=con.createStatement();
//执行查询命令
rs=stmt.executeQuery("select * from books");
//输出查询结果
out.print("<table border=1 align='center'>");
out.print("<tr><td>编号</td><td>作者</td><td>书名</td><td>价格</td><td>出版时间</td><td>图书描述</td><td>数量</td></tr>");
while(rs.next()){
String col1=rs.getString(1);
String col2=rs.getString(2);
String col3=rs.getString(3);
float col4=rs.getFloat(4);
int col5=rs.getInt(5);
String col6=rs.getString(6);
int col7=rs.getInt(7);
//打印获取到的数据
out.print("<tr><td>"+col1+"</td><td>"+col2+"</td><td>"+col3+"</td><td>"+col4+"</td><td>"+col5+"</td><td>"+col6+"</td><td>"+col7+"</td></tr>");
}
out.print("</table>");
}catch(Exception e){
//捕获到的错误信息打印出来
out.print(e.getMessage());
}
%>
</body>
</html>
c3p0jstlReSourceTest.jsp
<%@ page language="java" contentType="text/html; charset=gbk" pageEncoding="gbk"%>
<%@ 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=gbk">
<title>使用c3p0连接池jstl 测试sql</title>
</head>
<body>
<sql:query var="rs" dataSource="c3p0/bookdb">select * from books</sql:query>
<table border=1 align='center'>
<tr><td>编号</td><td>作者</td><td>书名</td><td>价格</td><td>出版时间</td><td>图书描述</td><td>数量</td></tr>
<c:forEach var="row" items="${rs.rows}">
<tr>
<td>${row.id}</td>
<td>${row.name}</td>
<td>${row.title}</td>
<td>${row.price}</td>
<td>${row.yr}</td>
<td>${row.description}</td>
<td>${row.saleAmount}</td>
</tr>
</c:forEach>
</table>
</body>
</html>
测试连接MySql数据库
<%@ page language="java" import="java.util.*" import="java.io.*" import="java.sql.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>测试连接MySql数据库</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
Connection con=null;
Statement stmt=null;
ResultSet rs=null;
try{
//加载MySql驱动程序
Class.forName("com.mysql.jdbc.Driver");
//连接数据库字符串
String dbUrl="jdbc:mysql://localhost:3306/bookdb";
String dbUser="root";
String dbPwd="888";
//获得数据库连接
con=DriverManager.getConnection(dbUrl,dbUser,dbPwd);
//得到命令对象
stmt=con.createStatement();
//查询得到结果集
rs=stmt.executeQuery("select * from books");
//输出查询结果
out.print("<table border=1 align='center'>");
out.print("<tr><td>编号</td><td>作者</td><td>书名</td><td>价格</td><td>出版时间</td><td>图书描述</td><td>数量</td></tr>");
while(rs.next()){
String col1=rs.getString(1);
String col2=rs.getString(2);
String col3=rs.getString(3);
float col4=rs.getFloat(4);
int col5=rs.getInt(5);
String col6=rs.getString(6);
int col7=rs.getInt(7);
//打印获取到的数据
out.print("<tr><td>"+col1+"</td><td>"+col2+"</td><td>"+col3+"</td><td>"+col4+"</td><td>"+col5+"</td><td>"+col6+"</td><td>"+col7+"</td></tr>");
}
out.print("</table>");
}catch(Exception e){
//捕获到的错误信息打印出来
out.print(e.getMessage());
}finally{
rs.close();
stmt.close();
con.close();
}
%>
</body>
</html>
测试连接oracle数据库
<%@ page language="java" import="java.util.*" import="java.io.*" import="java.sql.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>测试连接oracle数据库</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
Connection con=null;
Statement stmt=null;
ResultSet rs=null;
try{
//加载MySql驱动程序
Class.forName("oracle.jdbc.driver.OracleDriver");
//连接数据库字符串
String dbUrl="jdbc:oracle:thin:@127.0.0.1:1521:fengniao";
String dbUser="system";
String dbPwd="";
//获得数据库连接
con=DriverManager.getConnection(dbUrl,dbUser,dbPwd);
//得到命令对象
stmt=con.createStatement();
//查询得到结果集
rs=stmt.executeQuery("select books.*, books.rowid from books");
//输出查询结果
out.print("<table border=1 align='center'>");
out.print("<tr><td>编号</td><td>作者</td><td>书名</td><td>价格</td><td>出版时间</td><td>图书描述</td><td>数量</td></tr>");
while(rs.next()){
String col1=rs.getString(1);
String col2=rs.getString(2);
String col3=rs.getString(3);
float col4=rs.getFloat(4);
int col5=rs.getInt(5);
String col6=rs.getString(6);
int col7=rs.getInt(7);
//打印获取到的数据
out.print("<tr><td>"+col1+"</td><td>"+col2+"</td><td>"+col3+"</td><td>"+col4+"</td><td>"+col5+"</td><td>"+col6+"</td><td>"+col7+"</td></tr>");
}
out.print("</table>");
}catch(Exception e){
//捕获到的错误信息打印出来
out.print(e.getMessage());
}finally{
//rs.close();
stmt.close();
con.close();
}
%>
</body>
</html>
ReSourceTest.jsp
<%@ page language="java" import="java.sql.*" import="javax.naming.*" import="javax.sql.*" contentType="text/html; charset=gbk"pageEncoding="gbk"%>
<!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=gbk">
<title>Insert title here</title>
</head>
<body>
<%
Connection con=null;
Statement stmt=null;
ResultSet rs=null;
try{
Context context=new InitialContext();
DataSource ds=(DataSource)context.lookup("java:comp/env/jdbc/bookdb");
//获得数据库连接
con=ds.getConnection();
//得到命令对象
stmt=con.createStatement();
//查询得到结果集
rs=stmt.executeQuery("select * from books");
//输出查询结果
out.print("<table border=1 align='center'>");
out.print("<tr><td>编号</td><td>作者</td><td>书名</td><td>价格</td><td>出版时间</td><td>图书描述</td><td>数量</td></tr>");
while(rs.next()){
String col1=rs.getString(1);
String col2=rs.getString(2);
String col3=rs.getString(3);
float col4=rs.getFloat(4);
int col5=rs.getInt(5);
String col6=rs.getString(6);
int col7=rs.getInt(7);
//打印获取到的数据
out.print("<tr><td>"+col1+"</td><td>"+col2+"</td><td>"+col3+"</td><td>"+col4+"</td><td>"+col5+"</td><td>"+col6+"</td><td>"+col7+"</td></tr>");
}
out.print("</table>");
}catch(Exception e){
//捕获到的错误信息打印出来
out.print(e.getMessage());
}finally{
//rs.close();
//stmt.close();
//con.close();
}
%>
</body>
</html>
在apache-tomcat-6.0.18/conf/comtext.xml 中配置数据源
中加入
<Resource auth="Container"
description="DB Connection"
driverClass="com.microsoft.sqlserver.jdbc.SQLServerDriver"
maxPoolSize="100"
minPoolSize="2"
acquireIncrement="1"
name="jdbc/Examination"
user="sa"
password=""
factory="org.apache.naming.factory.BeanFactory"
type="com.mchange.v2.c3p0.ComboPooledDataSource"
jdbcUrl="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=bookdb" />
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