<?php
class SqlAction extends Action{
function outsql(){
header(“Content-Type:text/html;charset=utf-8″);
/*用C方法讀取數(shù)據(jù)庫配置*/
$host=C(‘DB_HOST');
$db_name=C(‘DB_NAME');
$user=C(‘DB_USER');
$password=C(‘DB_PWD');
/*調(diào)用導(dǎo)出數(shù)據(jù)庫的私有方法*/
$outstream=$this->outputSql($host, $dbname, $user, $password);
/*下載導(dǎo)出數(shù)據(jù)庫*/
header(“Content-Disposition: attachment; filename=$dbname.sql”);
echo $outstream;
}
/*
* 數(shù)據(jù)庫導(dǎo)出函數(shù)outputSql
* 用PDO方式導(dǎo)出數(shù)據(jù)庫數(shù)據(jù)
* $host 主機名 如localhost
* $dbname 數(shù)據(jù)庫名
* $user 用戶名
* $password 密碼
* $flag 標(biāo)志位0或1 0為僅導(dǎo)出數(shù)據(jù)庫結(jié)構(gòu) 1為導(dǎo)出數(shù)據(jù)庫結(jié)構(gòu)和數(shù)據(jù) 默認為1
*/
private function outputSql($host, $dbname, $user, $password, $flag=1) {
try {
$pdo = new PDO(“mysql:host=$host;dbname=$dbname”, $user, $password); //連接數(shù)據(jù)庫
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); //設(shè)置調(diào)優(yōu)參數(shù)，遇到錯誤拋出異常
} catch (PDOException $e) {
echo $e->getMessage(); //如果連接異常則拋出錯誤信息
exit;
}
$mysql = “DROP DATABASE IF EXISTS `$dbname`;\n”; //$mysql裝載sql語句，這里如果存在數(shù)據(jù)庫則drop該數(shù)據(jù)庫
$creat_db=$pdo->query(“show create database $dbname”)->fetch();//用show create database查看sql語句
preg_match(‘/DEFAULT CHARACTER SET(.*)\*/', $creat_db[‘Create Database'],$matches);//正則取出DEFAULT CHARACTER SET 后面的字符集
$mysql.=”CREATE DATABASE `$dbname` DEFAULT CHARACTER SET $matches[1]”;//該語句如CREATE DATABASE `test_db` DEFAULT CHARACTER SET utf8
/*查找該數(shù)據(jù)庫的字符整序如COLLATE utf8_general_ci*/
$db_collate=$pdo->query(“SELECT DEFAULT_COLLATION_NAME FROM information_schema.SCHEMATA WHERE SCHEMA_NAME ='$dbname' LIMIT 1″)->fetch();
$mysql.=”COLLATE “.$db_collate[‘DEFAULT_COLLATION_NAME'].”;\nUSE `$dbname`;\n\n”;
$statments = $pdo->query(“show tables”); //返回結(jié)果集，show tables檢視所有表名
foreach ($statments as $value) {//遍歷此結(jié)果集，導(dǎo)出每個表名對應(yīng)的信息
$table_name = $value[0]; //獲取該表名
$mysql.=”DROP TABLE IF EXISTS `$table_name`;\n”; //每個表前都準(zhǔn)備Drop語句
$table_query = $pdo->query(“show create table `$table_name`”); //取出該表建表信息的結(jié)果集
$create_sql = $table_query->fetch(); //利用fetch方法取出該結(jié)果集對應(yīng)的數(shù)組
$mysql.=$create_sql[‘Create Table'] . “;\r\n\r\n”; //寫入建表信息
if ($flag != 0) {//如果標(biāo)志位不是0則繼續(xù)取出該表內(nèi)容生成insert語句
$iteams_query = $pdo->query(“select * from `$table_name`”); //取出該表所有字段結(jié)果集
$values = “”; //準(zhǔn)備空字符串裝載insert value值
$items = “”; //準(zhǔn)備空字符串裝載該表字段名
while ($item_query = $iteams_query->fetch(PDO::FETCH_ASSOC)) { //用關(guān)聯(lián)查詢方式返回表中字段名和值的數(shù)組
$item_names = array_keys($item_query); //取出該數(shù)組鍵值 即字段名
$item_names = array_map(“addslashes”, $item_names); //將特殊字符轉(zhuǎn)譯加\
$items = join(‘`,`', $item_names); //聯(lián)合字段名 如：items1`,`item2 `符號為反引號 鍵盤1旁邊 字段名用反引號括起
$item_values = array_values($item_query); //取出該數(shù)組值 即字段對應(yīng)的值
$item_values = array_map(“addslashes”, $item_values); //將特殊字符轉(zhuǎn)譯加\
$value_string = join(“‘,'”, $item_values); //聯(lián)合值 如：value1′,'value2 值用單引號括起
$value_string = “(‘” . $value_string . “‘),”; //值兩邊加括號
$values.=”\n” . $value_string; //最后返回給$value
}
if ($values != “”) {//如果$values不為空，即該表有內(nèi)容
//寫入insert語句
$insert_sql = “INSERT INTO `$table_name` (`$items`) VALUES” . rtrim($values, “,”) . “;\n\r”;
//將該語句寫入$mysql
$mysql.=$insert_sql;
}
}

}
return $mysql;
}
}
?>