package com.common;
import java.sql.*;
public class DataBaseConn {
public Connection conn = null;
public void createConn(){
String url = "jdbc:mysql://localhost:3306/employeeDb";
String username = "root";// 数据库用户名
String password = "root";// 数据库密码
if(conn == null){
try{ Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url,username,password);
}catch(Exception e){e.toString();}
}
}
public Connection getConn(){
if(conn == null){ createConn();}
return conn;
}
public void closeConn(){
if(conn != null){
try {
conn.close();
conn = null;
} catch (Exception e) { e.printStackTrace(); }
}
}
public ResultSet executeQuery(String sql) {
ResultSet rs = null;
if (conn == null) {createConn();}
try {
Statement stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
} catch (Exception e) { e.printStackTrace(); }
return rs;
}
public void executeUpdate(String sql) {
if (conn == null) {createConn(); }
try { Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
stmt.executeUpdate(sql);
} catch (Exception e) { e.printStackTrace(); }
}
}
<jsp:useBean id="con" class="com.common.DataBaseConn" scope="page"/>
<% con.getConn();
String sql="select * from employee_info";
ResultSet rs= con.executeQuery(sql);
%>
<table border='1' width='100%'>
<tr> <th>雇员号</th> <th>姓名</th> <th>出生日期</th><th >薪水</th></tr>
<%
while( rs.next() ) { out.print("<tr>");
out.print("<td >"+rs.getString(1)+"</td>");
out.print("<td >"+rs.getString(2)+"</td>");
out.print("<td >"+rs.getDate("birthday")+"</td>");
out.print("<td >"+rs.getInt("salary")+"</td>");
out.print("</tr>") ; }
out.print("</table>");
con.closeConn();
%>
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