現(xiàn)在有好多初學(xué)jsp的網(wǎng)友經(jīng)常會(huì)問數(shù)據(jù)庫怎么連接啊，怎么老出錯(cuò)??？所以我集中的在這寫篇文章供大家參考，其實(shí)這種把數(shù)據(jù)庫邏輯全部放在jsp里未必是好的做法，但是有利于初學(xué)者學(xué)習(xí)，所以我就這樣做了，當(dāng)大家學(xué)到一定程度的時(shí)候，可以考慮用MVC的模式開發(fā)。在練習(xí)這些代碼的時(shí)候，你一定將jdbc的驅(qū)動(dòng)程序放到服務(wù)器的類路徑里，然后要在數(shù)據(jù)庫里建一個(gè)表test,有兩個(gè)字段比如為test1，test2，可以用下面SQL建
create table test(test1 varchar(20),test2 varchar(20)
然后向這個(gè)表寫入一條測(cè)試紀(jì)錄
那么現(xiàn)在開始我們的jsp和數(shù)據(jù)庫之旅吧。
一、jsp連接Oracle8/8i/9i數(shù)據(jù)庫（用thin模式）
testoracle.jsp如下：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
String url="jdbc:oracle:thin:@localhost:1521:orcl";
//orcl為你的數(shù)據(jù)庫的SID
String user="scott";
String password="tiger";
Connection conn= DriverManager.getConnection(url,user,password);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from test";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {%>
您的第一個(gè)字段內(nèi)容為：<%=rs.getString(1)%>
您的第二個(gè)字段內(nèi)容為：<%=rs.getString(2)%>
<%}%>
<%out.print("數(shù)據(jù)庫操作成功，恭喜你");%>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
二、jsp連接Sql Server7.0/2000數(shù)據(jù)庫
testsqlserver.jsp如下：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=pubs";
//pubs為你的數(shù)據(jù)庫的
String user="sa";
String password="";
Connection conn= DriverManager.getConnection(url,user,password);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from test";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {%>
您的第一個(gè)字段內(nèi)容為：<%=rs.getString(1)%>
您的第二個(gè)字段內(nèi)容為：<%=rs.getString(2)%>
<%}%>
<%out.print("數(shù)據(jù)庫操作成功，恭喜你");%>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
三、jsp連接DB2數(shù)據(jù)庫
testdb2.jsp如下：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("com.ibm.db2.jdbc.app.DB2Driver ").newInstance();
String url="jdbc:db2://localhost:5000/sample";
//sample為你的數(shù)據(jù)庫名
String user="admin";
String password="";
Connection conn= DriverManager.getConnection(url,user,password);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from test";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {%>
您的第一個(gè)字段內(nèi)容為：<%=rs.getString(1)%>
您的第二個(gè)字段內(nèi)容為：<%=rs.getString(2)%>
<%}%>
<%out.print("數(shù)據(jù)庫操作成功，恭喜你");%>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
四、jsp連接Informix數(shù)據(jù)庫
testinformix.jsp如下：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("com.informix.jdbc.IfxDriver").newInstance();
String url =
"jdbc:informix-sqli://123.45.67.89:1533/testDB:INFORMIXSERVER=myserver;
user=testuser;password=testpassword";
//testDB為你的數(shù)據(jù)庫名
Connection conn= DriverManager.getConnection(url);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from test";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {%>
您的第一個(gè)字段內(nèi)容為：<%=rs.getString(1)%>
您的第二個(gè)字段內(nèi)容為：<%=rs.getString(2)%>
<%}%>
<%out.print("數(shù)據(jù)庫操作成功，恭喜你");%>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
五、jsp連接Sybase數(shù)據(jù)庫
testmysql.jsp如下：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("com.sybase.jdbc.SybDriver").newInstance();
String url =" jdbc:sybase:Tds:localhost:5007/tsdata";
//tsdata為你的數(shù)據(jù)庫名
Properties sysProps = System.getProperties();
SysProps.put("user","userid");
SysProps.put("password","user_password");
Connection conn= DriverManager.getConnection(url, SysProps);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from test";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {%>
您的第一個(gè)字段內(nèi)容為：<%=rs.getString(1)%>
您的第二個(gè)字段內(nèi)容為：<%=rs.getString(2)%>
<%}%>
<%out.print("數(shù)據(jù)庫操作成功，恭喜你");%>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
六、jsp連接MySQL數(shù)據(jù)庫
testmysql.jsp如下：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("org.gjt.mm.mysql.Driver").newInstance();
String url ="jdbc:mysql://localhost/softforum?user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1"
//testDB為你的數(shù)據(jù)庫名
Connection conn= DriverManager.getConnection(url);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from test";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {%>
您的第一個(gè)字段內(nèi)容為：<%=rs.getString(1)%>
您的第二個(gè)字段內(nèi)容為：<%=rs.getString(2)%>
<%}%>
<%out.print("數(shù)據(jù)庫操作成功，恭喜你");%>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
七、jsp連接PostgreSQL數(shù)據(jù)庫
testmysql.jsp如下：
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("org.postgresql.Driver").newInstance();
String url ="jdbc:postgresql://localhost/soft"
//soft為你的數(shù)據(jù)庫名
String user="myuser";
String password="mypassword";
Connection conn= DriverManager.getConnection(url,user,password);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from test";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {%>
您的第一個(gè)字段內(nèi)容為：<%=rs.getString(1)%>
您的第二個(gè)字段內(nèi)容為：<%=rs.getString(2)%>
<%}%>
<%out.print("數(shù)據(jù)庫操作成功，恭喜你");%>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>
以下程序是Hiberante入門程序:代碼如下:首先說hibernate開發(fā)流程.A、準(zhǔn)備一個(gè)POJO類 B、創(chuàng)建類的映射和配置文件(hibernate.cfg.xml class.hbm.xml)class.hbm.xml此配置文件是必須與POJO類中的屬性一一對(duì)應(yīng).
現(xiàn)在我以我創(chuàng)建的程序?yàn)槔齺磉M(jìn)行說明:數(shù)據(jù)庫為demo,表的名字為admin
1、POJO類
package com.wch.pojo;
public class Admin {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
class.hbm.xml映射文件存放位置必須于POJO位置一致.也就是說必須放在同一個(gè)目錄.hibernate.cfg.xml放在src根目錄下.
2、創(chuàng)建hibernate.cfg.xml和class.hbm.xml(class指的是POJO類的名字)
class.hbm.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
<class name="com.wch.pojo.Admin" table="admin">
<id name="id" type="integer">
<column name="id" />
<generator class="assigned"></generator>
</id>
<property name="username" type="string">
<column name="username" length="32" not-null="false" />
</property>
<property name="password" type="string">
<column name="password" length="20" not-null="false" />
</property>
</class>
</hibernate-mapping>
hibernate.cfg.xml:
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/demo
</property>
<property name="connection.username">root</property>
<property name="connection.password">****</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="myeclipse.connection.profile">mysql5.0</property>
<property name="show_sql">true</property>
<mapping resource="com/wch/pojo/Admin.hbm.xml" />
</session-factory>
</hibernate-configuration>
3、創(chuàng)建應(yīng)用程序并進(jìn)行代碼測(cè)試:
package com.wch.op;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.wch.pojo.Admin;
public class UserOperation {
public static void main(String[] args)throws Exception{
Configuration config = new Configuration().configure();
// 創(chuàng)建工廠
SessionFactory factory = config.buildSessionFactory();
// 打開session
Session session = factory.openSession();
// 事務(wù)提交
try{
Transaction tx = session.beginTransaction();
// 創(chuàng)建對(duì)象
Admin hb = new Admin();
hb.setId(3);
hb.setUsername("Hibernate3.2");
hb.setPassword("20081202");
//hb.setUsername("WCH");
//hb.setPassword("Hibernate");
// 執(zhí)行插入語句,在hibernat中操作的是一個(gè)對(duì)象
session.save(hb);
// 提交事務(wù)
tx.commit();
}catch(Exception e)
{
System.out.println("error Msg:"+e.getMessage());
}finally{
// close session
session.close();
}
}
}
更為詳細(xì)的解釋請(qǐng)參照Hibernate官方網(wǎng)站:www.hibernate.org