%@ page contentType="text/html;charset=8859_1" %>
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.sql.DataSource"%>
<%@ page import="javax.naming.InitialContext"%>
<%@ page import="java.sql.*"%>
<%
//变量声明
java.sql.Connection sqlCon; //数据库连接对象
java.sql.Statement sqlStmt; //SQL语句对象
java.sql.ResultSet sqlRst; //结果集对象 java.lang.String strCon; //数据库连接字符串
java.lang.String strSQL; //SQL语句 int intPageSize; //一页显示的记录数
int intRowCount; //记录总数
int intPageCount; //总页数
int intPage; //待显示页码
java.lang.String strPage; int i; //设置一页显示的记录数
intPageSize = 2; //取得待显示页码
strPage = request.getParameter("page");
if(strPage==null){//表明在QueryString中没有page这一个参数，此时显示第一页数据
intPage = 1;
}
else{//将字符串转换成整型
intPage = java.lang.Integer.parseInt(strPage);
if(intPage<1) intPage = 1;
}
//数据库的连接
DataSource ds = null;
try{
Connection sqlCon =com.hsqry.util.DatabaseConn.getConnection(); if(sqlCon!=null)
{
out.println("Connection is OK!");
out.println("<br>");//创建一个可以滚动的只读的SQL语句对象
sqlStmt = sqlCon.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY); //准备SQL语句
strSQL = "select t01name ,t01sex from t01"; //执行SQL语句并获取结果集
sqlRst = sqlStmt.executeQuery(strSQL); //获取记录总数
sqlRst.last();
intRowCount = sqlRst.getRow(); //记算总页数
intPageCount = (intRowCount+intPageSize-1) / intPageSize; //调整待显示的页码
if(intPage>intPageCount) intPage = intPageCount;
while(sqlRst.next())
{out.println("<br>");}
}
else
out.println("Fail!");
}catch(Exception ne){ out.println(ne);}
%> <html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JSP数据库操作例程 - 数据分页显示 - JDBC 2.0 - Oracle</title>
</head> <body> <table border="1" cellspacing="0" cellpadding="0">
<tr>
<th>姓名</th>
<th>年龄</th>
</tr> <%
if(intPageCount>0){
//将记录指针定位到待显示页的第一条记录上
sqlRst.absolute((intPage-1) * intPageSize + 1); //显示数据
i = 0;
while(i<intPageSize && !sqlRst.isAfterLast()){
%>
<tr>
<td><%=sqlRst.getString(1)%></td>
<td><%=sqlRst.getString(2)%></td>
</tr>
<%
sqlRst.next();
i++;
}
}
%> </table> 第<%=intPage%>页 共<%=intPageCount%>页 <%if(intPage<intPageCount){%><a href="page_dis.jsp?page=<%=intPage+1%>">下一页</a><%}%> <%if(intPage>1){%><a href="page_dis.jsp?page=<%=intPage-1%>">上一页</a><%}%> </body>
</html> <%
//关闭结果集
sqlRst.close(); //关闭SQL语句对象
sqlStmt.close(); //关闭数据库
sqlCon.close();
%>
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.sql.DataSource"%>
<%@ page import="javax.naming.InitialContext"%>
<%@ page import="java.sql.*"%>
<%
//变量声明
java.sql.Connection sqlCon; //数据库连接对象
java.sql.Statement sqlStmt; //SQL语句对象
java.sql.ResultSet sqlRst; //结果集对象 java.lang.String strCon; //数据库连接字符串
java.lang.String strSQL; //SQL语句 int intPageSize; //一页显示的记录数
int intRowCount; //记录总数
int intPageCount; //总页数
int intPage; //待显示页码
java.lang.String strPage; int i; //设置一页显示的记录数
intPageSize = 2; //取得待显示页码
strPage = request.getParameter("page");
if(strPage==null){//表明在QueryString中没有page这一个参数，此时显示第一页数据
intPage = 1;
}
else{//将字符串转换成整型
intPage = java.lang.Integer.parseInt(strPage);
if(intPage<1) intPage = 1;
}
//数据库的连接
DataSource ds = null;
try{
Connection sqlCon =com.hsqry.util.DatabaseConn.getConnection(); if(sqlCon!=null)
{
out.println("Connection is OK!");
out.println("<br>");//创建一个可以滚动的只读的SQL语句对象
sqlStmt = sqlCon.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY); //准备SQL语句
strSQL = "select t01name ,t01sex from t01"; //执行SQL语句并获取结果集
sqlRst = sqlStmt.executeQuery(strSQL); //获取记录总数
sqlRst.last();
intRowCount = sqlRst.getRow(); //记算总页数
intPageCount = (intRowCount+intPageSize-1) / intPageSize; //调整待显示的页码
if(intPage>intPageCount) intPage = intPageCount;
while(sqlRst.next())
{out.println("<br>");}
}
else
out.println("Fail!");
}catch(Exception ne){ out.println(ne);}
%> <html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JSP数据库操作例程 - 数据分页显示 - JDBC 2.0 - Oracle</title>
</head> <body> <table border="1" cellspacing="0" cellpadding="0">
<tr>
<th>姓名</th>
<th>年龄</th>
</tr> <%
if(intPageCount>0){
//将记录指针定位到待显示页的第一条记录上
sqlRst.absolute((intPage-1) * intPageSize + 1); //显示数据
i = 0;
while(i<intPageSize && !sqlRst.isAfterLast()){
%>
<tr>
<td><%=sqlRst.getString(1)%></td>
<td><%=sqlRst.getString(2)%></td>
</tr>
<%
sqlRst.next();
i++;
}
}
%> </table> 第<%=intPage%>页 共<%=intPageCount%>页 <%if(intPage<intPageCount){%><a href="page_dis.jsp?page=<%=intPage+1%>">下一页</a><%}%> <%if(intPage>1){%><a href="page_dis.jsp?page=<%=intPage-1%>">上一页</a><%}%> </body>
</html> <%
//关闭结果集
sqlRst.close(); //关闭SQL语句对象
sqlStmt.close(); //关闭数据库
sqlCon.close();
%>
[javac] Compiling 1 source fileC:\INSUR\Tomcat5\work\Catalina\localhost\query\org\apache\jsp\page_005fdis_jsp.java:85: sqlCon is already defined in _jspService(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
Connection sqlCon =com.hsqry.util.DatabaseConn.getConnection();
^
1 error
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:128)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:413)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:453)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:437)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:555)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
try{
Connection sqlCon =com.hsqry.util.DatabaseConn.getConnection(); 在前面%@ page contentType="text/html;charset=8859_1" %>
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.sql.DataSource"%>
<%@ page import="javax.naming.InitialContext"%>
<%@ page import="java.sql.*"%>
<%
//变量声明
java.sql.Connection sqlCon; //数据库连接对象 已经定义了
要学会自己看错误信息，其实java里面的单词也没多少。这样会好些,做起来也会快点。
Connection sqlCon =com.hsqry.util.DatabaseConn.getConnection();
重复定义同一个变量