JAvabeansカプセル化データベース接続操作
Datasql.java
package data;
import java.sql.*;
public class Datasql {
private final String url="127.0.0.1/";
private final String database="book";
private final String usename="root";
private final String password="yy3948389";
private final String driver="com.mysql.jdbc.Driver";
private String connstr="jdbc:mysql://";
private String sqlstr;
Connection conn=null;
ResultSet rs=null;
Statement stmt=null;
public Datasql(){
try{
conn=openconn();
stmt=conn.createStatement();
}catch(Exception e){
System.err.println(" ");
}
}
public Connection openconn()throws Exception,SQLException{
try{
Class.forName(driver).newInstance();
}catch(Exception e){
System.err.println(" ");
}
return conn=DriverManager.getConnection(connstr+url+database,usename,password);
}
public ResultSet select(String sqlstr){
this.sqlstr=sqlstr;
try{
rs=stmt.executeQuery(sqlstr);
}catch(SQLException e){
System.err.println(sqlstr+": ");
}
return rs;
}
public boolean updata(String sqlstr){
this.sqlstr=sqlstr;
try{
stmt.executeUpdate(sqlstr);
return true;
}catch(SQLException e){
System.err.println(sqlstr+": ");
return false;
}
}
public boolean insert(String sqlstr){
this.sqlstr=sqlstr;
try{
stmt.executeUpdate(sqlstr);
return true;
}catch(SQLException e){
System.err.println(sqlstr+": ");
return false;
}
}
public boolean delete(String sqlstr){
this.sqlstr=sqlstr;
try{
stmt.executeUpdate(sqlstr);
return true;
}catch(SQLException e){
System.err.println(sqlstr+": ");
return false;
}
}
public boolean close(){
try{
if(rs!=null){
rs.close();
}
if(stmt!=null){
stmt.close();
}
if(conn!=null){
conn.close();
}
return true;
}catch(Exception e){
System.err.println(" ！");
return false;
}
}
}show.jsp <%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title> </title>
</head>
<style type="text/css">
<!--
.STYLE1 {
font-size: 14px;
color: #FFFFFF;
font-weight: bold;
font-family: " ";
}
body,td,th {
font-family: ;
font-size: 12px;
color: #000000;
}
body {
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
-->
</style>
<body>
<jsp:useBean id="sqlbean" scope="page" class="data.Datasql"/>
<table width="80%" border="1" align="center" cellpadding="0" cellspacing="0" bordercolor="#CCCCCC">
<tr>
<td height="30" colspan="2" align="center" valign="middle" bgcolor="#0099FF"><span class="STYLE1"> <%=new java.text.SimpleDateFormat(" yyyy d mm ").format(new java.util.Date())%></span></td>
</tr>
<%
ResultSet rs=sqlbean.select("select name from admin");
int i=0;
while(rs.next()){
String name=rs.getString("name");
i++;
%>
<tr>
<td width="15%" height="20" align="center" valign="middle"><%=i%></td>
<td width="85%" align="center" valign="middle"><%=name%></td>
</tr>
<%
}
if(!sqlbean.close()){
out.println(" ");
}
%>
</table>
</body>
</html>