2
我繼承了下面的代碼，該代碼爲名爲'database_name'的MySQL數據庫創建Web界面，並由變量$database定義。如何循環訪問PHP腳本中的多個MySQL數據庫
我想添加一個額外的數據庫到這個腳本中，這樣就可以創建第二個數據庫（它的設置方式與第一個數據庫具有相同的表名等相同包含不同的數據）。有沒有辦法讓$database一個字符串數組，我可以循環多個數據庫名稱？
<?php
class DatabaseInterface {
public $host = "localhost"; //(name or ip address)
public $userName = "aksfhah";
public $passWord = "**********";
public $database = 'database_name';
public $tableData = "measurements";
public $tableMinbins = "minbins";
public $tableHourbins = "hourbins";
public $tableDaybins = "daybins";
public $tableDescriptions = "measurementDescriptions";
public $tableSpecs = "experimentDescriptions";
public $connection;
public function __construct($databaseName = "database_name") {
$this->database = $databaseName;
$this->connect();
}
public function connect($databaseName = null) {
$dbh = mysql_connect($this->host, $this->userName, $this->passWord);
if (is_null($databaseName)) {
mysql_select_db($this->database);
} else {
mysql_select_db($databaseName);
}
$this->connection = $dbh;
return $dbh;
}
public function initializeDatabase() {
$this->createDataTable($this->tableData);
$query = "create table if not exists $this->tableDescriptions (id int auto_increment primary key,type varchar(255),
description varchar(255), experimentname varchar(255), unique Key(description,experimentname)) engine=myisam";
mysql_query($query); //create a table if it does not exist
echo mysql_error(); //report error if one occurred
}
private function createDataTable($tableName) {
$query = "CREATE TABLE IF NOT EXISTS $tableName (
id smallint(5) unsigned NOT NULL,
time datetime NOT NULL,
measurement float DEFAULT NULL,
rebinned tinyint(4) DEFAULT '0',
PRIMARY KEY (id,time),
KEY (rebinned,id)
) ENGINE=MyISAM";
mysql_query($query); //create a table if it does not exist
echo mysql_error(); //report error if one occurred
}
public function insertByDescription($time, $value, $channelDescription, $experimentDescription, $type = "other") {
$sensorID = $this->createIdFromDescription($channelDescription, $experimentDescription, $type);
return $this->insertById($time, $value, $sensorID);
}
public function insertMultipleById($timeArray, $valueArray, $sensorID,$tableName=null) {
if(is_null($tableName)){
$tableName= $this->tableData;
}
if (count($timeArray) == 0)
return 0;
$query = "insert ignore into $tableName (id,time,measurement)
VALUES ";
for ($index = 0; $index < count($timeArray); $index++) {
$timeString = $timeArray[$index]->format("Y-m-d H:i:s");
$value = $valueArray[$index];
$query = $query . "('$sensorID','$timeString','$value'),";
}
$query = substr($query, 0, strlen($query) - 1); //trim final comma
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error();
return false;
} else
return mysql_affected_rows();
}
public function insertMultipleByDescription($timeArray, $valueArray, $channelDescription, $experimentDescription, $type = "other",$tableName=null) {
$sensorID = $this->createIdFromDescription($channelDescription, $experimentDescription, $type);
return $this->insertMultipleById($timeArray, $valueArray, $sensorID,$tableName);
}
public function insertById(DateTime $time, $value, $sensorID) {
$timeString = $time->format("Y-m-d H:i:s");
$query = "insert ignore into $this->tableData (id,time,measurement)
VALUES ('$sensorID','$timeString','$value')";
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error();
return false;
} else if (mysql_affected_rows() == 0) {
return false;
} else {
return true;
}
}
public function createIdFromDescription($channelDescription, $experimentDescription, $type) {
$sensorId = $this->getIdFromDescription($channelDescription, $experimentDescription);
if (!$sensorId) {
$query = "insert ignore into $this->tableDescriptions (description,experimentname,type)
VALUES ('$channelDescription','$experimentDescription','$type')";
$result = mysql_query($query);
$sensorId = mysql_insert_id();
}
return $sensorId;
}
public function getIdFromDescription($measurementDescription, $experimentDescription) {
$sensorId = false;
$query = "select id from $this->tableDescriptions where description like '$measurementDescription'
&& experimentname like '$experimentDescription'";
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error(); //report error if one occurred
return false;
}
if (mysql_num_rows($result) > 0) {
$row = mysql_fetch_array($result);
$sensorId = $row['id'];
}
return $sensorId;
}
function getDataById($id, $startDate, $endDate, $interval = "") {
$data = array();
$startDateString = $startDate->format("Y-m-d H:i:s");
$endDateString = $endDate->format("Y-m-d H:i:s");
$query = "select time,measurement from $this->tableData where id='$id' && time>='$startDateString' && time <='$endDateString' order by time asc " . $interval = "" ? "" : "group by $interval";
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error(); //report error if one occurred
return false;
}
while ($row = mysql_fetch_array($result)) {
//$time = new DateTime($row['time']);
$data[] = array($row['time'], $row['measurement'] * 1);
}
return $data;
}
public function getMostRecentData($id, $table) {
$query = "select date(max(time)) as time,measurement from $table where id='$id'";
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error(); //report error if one occurred
return false;
} elseif (mysql_num_rows($result) > 0) {
$row = mysql_fetch_array($result);
return $row;
} else {
return false;
}
}
public function getExperimentList() {
$list = array();
$query = "select distinct experimentname from $this->tableDescriptions";
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error(); //report error if one occurred
return false;
}
while ($row = mysql_fetch_array($result)) {
$list[] = $row['experimentname'];
}
return $list;
}
public function getChannelList($experimentDescription) {
$list = array();
$query = "select id,description,type from $this->tableDescriptions where experimentname='$experimentDescription'";
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error(); //report error if one occurred
return false;
}
while ($row = mysql_fetch_array($result)) {
$list[$row['description']] = array("id" => $row['id'], "type" => $row['type']);
}
return $list;
}
public function getDescriptionFromId($id) {
$query = "select * from $this->tableDescriptions where id='$id'";
$result = mysql_query($query);
if (mysql_error()) {
echo mysql_error(); //report error if one occurred
return false;
}
if (mysql_num_fields($result) > 0) {
$row = mysql_fetch_array($result);
return array($row['type'], $row['description'], $row['experimentname']);
} else {
return false;
}
}
public function getDisplayName($experimentName) {
$query = "select displayName from $this->tableSpecs where experimentName='$experimentName'";
$result = mysql_query($query);
echo mysql_error();
$row = mysql_fetch_array($result);
if ($row) {
return $row['displayName'];
} else {
return false;
}
}
public function simpleQuery($query) {
$result = mysql_query($query);
echo mysql_error();
if ($result) {
$row = mysql_fetch_array($result);
if ($row) {
return $row[0];
} else {
return FALSE;
}
} else {
return FALSE;
}
}
public function rebin($tableSource, $tableTarget, $numSeconds, $sum = false) {
$this->createDataTable($tableTarget);
echo "Updating $tableSource to set rebinned from 0 to 2...";
$query = "update $tableSource set rebinned=2 where rebinned =0;";
mysql_query($query);
echo mysql_error();
echo "Done.\n";
$numRows = mysql_affected_rows();
echo "Found $numRows records in $tableSource that need rebinning...\n";
$query = "select id,from_unixtime(floor(unix_timestamp(min(time))/$numSeconds)*$numSeconds) as mintime from $tableSource where rebinned=2 group by id;";
$result = mysql_query($query);
echo mysql_error();
if ($result) {
while ($row = mysql_fetch_array($result)) {
$id = $row['id'];
$mintime = $row['mintime'];
echo $id . "...";
$query = "INSERT INTO $tableTarget (id,time,measurement,rebinned)
SELECT id,from_unixtime(floor(unix_timestamp(time)/$numSeconds)*$numSeconds)," . ($sum ? "sum" : "avg") . "(measurement) as measurement,0
FROM $tableSource WHERE id=$id && time>='$mintime'
GROUP BY id,floor(unix_timestamp(time)/$numSeconds)
ON DUPLICATE KEY UPDATE measurement=values(measurement), rebinned=0;";
mysql_query($query);
//echo $query;
echo mysql_error();
echo "Done.\n";
}
echo "Updating $tableSource to set rebinned from 2 to 1...";
$query = "update $tableSource set rebinned=1 where rebinned =2;";
mysql_query($query);
echo mysql_error();
echo "Done.\n";
}
}
public function getDCPower($experimentName, $startDate, $endDate) {
$out = array();
$query = $this->buildDCPowerQuery($experimentName, $this->tableMinbins);
if ($query) {
if ($startDate != "") {
$query = $query . " && m0.time>='$startDate' ";
}
if ($endDate != "") {
$query = $query . " && m0.time<='$endDate' ";
}
echo $query;
$result = mysql_query($query);
echo mysql_error();
while ($row = mysql_fetch_array($result)) {
// echo $row['time'].", ".$row['power']."\n";
$out[] = array($row['time'], $row['power'] + 0);
}
return $out;
} else {
return FALSE;
}
}
}
?>
太棒了。謝謝。這很有道理。一個問題。我應該如何修改DatabaseInterface類，以便變量'$ database'可以很容易地從另一個腳本傳遞給這個類？ – user1763897
你不需要：它已經被照顧了。只需在'new'聲明中指定'$ database'的值（請參閱答案）。使用'$ interface [x] - > database'來檢索該特定實例的數據庫值。 – LSerni