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私はphp5バージョンで何年もPHPコードを使用していました。しかし、今私はphp7のバージョンを使用する必要があります。私は以下のコードを添付しています。 "mysql"を "mysqli"に置き換えてphp7に必要な変更を加えましたが、ページにエラーが返されます：データベースを選択できません。メッセージ：データベースを選択できません
私はコードに何が間違っているのか分かりません。どんな助け？
<?php
/**
* @package mysql-database
*/
/**
* MySQL Database
*
* A singleton object which provides convenience methods for interfacing with
* a MySQL database in PHP 5. You can get the object's instance using the
* static {@link getInstance()} method. Being a singleton object, this class
* only supports one open database connection at a time and idealy suited to
* single-threaded applications. You can read
* about {@link http://php.net/manual/en/language.oop5.patterns.php the singleton
* pattern in the PHP manual}.
*
* <b>Getting Started</b>
* <code>
* $db = MySqlDatabase::getInstance();
*
* try {
* $db->connect('localhost', 'user', 'password', 'database_name');
* }
* catch (Exception $e) {
* die($e->getMessage());
* }
* </code>
*
* @package mysql-database
* @author Micah Carrick
* @copyright (c) 2010 - Micah Carrick
* @version 2.0
* @license BSD
*/
class MySqlDatabase
{
/**
* The MySQL link identifier created by {@link connect()}
*
* @var resource
*/
public $link;
/**
* @var string
*/
private $conn_str;
/**
* @var MySqlDatabase
*/
private static $instance;
const MYSQL_DATE_FORMAT = 'Y-m-d';
const MYSQL_TIME_FORMAT = 'H:i:s';
const MYSQL_DATETIME_FORMAT = 'Y-m-d H:i:s';
const INSERT_GET_AUTO_INCREMENT_ID = 1;
const INSERT_GET_AFFECTED_ROWS = 2;
/**
* Constructor
*
* Private constructor as part of the singleton pattern implementation.
*/
private function __construct() {}
/**
* Connect
*
* Establish a connection to a MySQL database. Returns the MySQL link
* link identifier or throws an exception if there is an error.
*
* <code>
* // get an instance of the Database singleton
* $db = MySqlDatabase::getInstance();
*
* // connect to a MySQL database (use your own login information)
* try {
* $db->connect('localhost', 'user', 'password', 'database_name');
* }
* catch (Exception $e) {
* die($e->getMessage());
* }
* </code>
*
* @param string
* @param string
* @param string
* @param string
* @param boolean
* @return resource
*/
public function connect($host = "localhost:3306", $user = "*****_***", $password = "********", $database = "*******", $persistant=false)
{
if ($persistant) {
$this->link = @mysql_pconnect($host, $user, $password);
} else {
$this->link = @mysqli_connect($host, $user, $password);
}
if (!$this->link)
{
throw new Exception('Unable to establish database connection: '
.mysqli_error());
}
mysqli_query("SET CHARACTER SET 'utf8'");
if ($database) $this->useDatabase($database);
$version = mysqli_get_server_info();
$this->conn_str = "'$database' on '[email protected]$host' (MySQL $version)";
return $this->link;
}
/**
* Delete
*
* Executes the DELETE statement specified in the query and returns the
* value from either the PHP {@link mysql_affected_rows()} function. Throws
* and exception if there is a MySQL error in the query.
*
* Note: With MySQL versions prior to 4.1.2, the affected rows on DELETE
* statements with no WHERE clause is 0. See {@link mysql_affected_rows()}
* for more information.
*
* @param string
* @return integer
*/
public function delete($query)
{
return $this->updateOrDelete($query);
}
/**
* Get Connection String
*
* Gets a string representing the connection.
*
* <code>
* echo $db->getConnectionString();
* // example output: 'test_database' on '[email protected]' (MySQL 5.1.47)
* </code>
*
* @return string
*/
public function getConnectionString()
{
return $this->conn_str;
}
/**
* Get Instance
*
* Gets the singleton instance for this object. This method should be called
* statically in order to use the Database object:
*
* <code>
* $db = MySqlDatabase::getInstance();
* </code>
*
* @return MySqlDatabase
*/
public static function getInstance()
{
if (!isset(self::$instance))
{
self::$instance = new MySqlDatabase();
}
return self::$instance;
}
/**
* Fetch One From Each Row
*
* Convenience method to get a single value from every row in a given
* query. This is usefull in situations where you know that the result will
* only have only one column of data and you need that all in a simple
* array.
*
* <code>
*
* $query = "SELECT name FROM users";
* $names = $db->fetchOneFromEachRow($query);
* echo 'Users: ' . implode(', ', $names);
* </code>
*
* @param string
* @return array
*/
public function fetchOneFromEachRow($query)
{
$rval = array();
foreach ($this->iterate($query, MySqlResultSet::DATA_NUMERIC_ARRAY) as $row) {
$rval[] = $row[0];
}
return $rval;
}
/**
* Fetch One Row
*
* Convenience method to get a single row from a given query. This is
* usefull in situations where you know that the result will only contain
* one record and therefore do not need to iterate over it.
*
* You can
* optionally specify the type of data to be returned (object or array)
* using one of the MySqlResultSet Data Constants. The default is
* {@link MySqlResultSet::DATA_OBJECT}.
*
* <code>
* // get one row of data
* $query = "SELECT first, last FROM users WHERE user_id = 24 LIMIT 1";
* $row = $db->fetchOneRow($query);
* echo $row->foo;
* echo $row->bar;
* </code>
*
* @param string
* @param integer
* @return mixed
*/
public function fetchOneRow($query, $data_type=MySqlResultSet::DATA_OBJECT)
{
$result = new MySqlResultSet($query, $data_type, $this->link);
$result->rewind();
$row = $result->current();
return $row;
}
/**
* Fetch One
*
* Convenience method to get a single value from a single row. Returns the
* value if the query returned a record, false if there were no results, or
* throws an exception if there was an error with the query.
*
* <code>
* // get the number of records in the 'users' table
* $count = $db->fetchOne("SELECT COUNT(*) FROM users");
* </code>
*
* @param string
* @return mixed
*/
public function fetchOne($query)
{
$result = new MySqlResultSet($query, MySqlResultSet::DATA_NUMERIC_ARRAY,
$this->link);
$result->rewind();
$row = $result->current();
if (!$row) return false;
else return $row[0];
}
/**
* Import SQL File
*
* Runs the queries defined in an SQL script file. The double-hyphen style
* comments must have a single space after the hyphens. Hash style comments
* and C-style comments are also supported.
*
* An optional user callback function can be specified to get information
* about each MySQL statement. The user callback function takes 3
* parameters: the line number as an integer, the query as a string, and the
* result of the query as a boolean.
*
* <code>
* function import_sql_callback($line_number, $sql_query, $result)
* {
* echo "Line $line_number: $sql_query ";
* if ($result) echo "(OK)<br/>";
* else echo "(FAIL)<br/>";
* }
* </code>
*
* You can optionally specify whether or not to abort importing statements
* when an SQL error occurs (defaults to 'true') in which case an exception
* will be thrown for any MySQL error.
*
* Returns the number of queries executed from the script or throws an
* exception if there is an error.
*
* <code>
* // no callback, throw exception on MySQL errors
* $number = $db->importSqlFile('queries.sql');
*
* // callback for each query, skip queries with MySQL errors
* $number = $db->importSqlFile('queries.sql', 'import_sql_callback', false);
* </code>
*
* TODO: Ensure this works with huge files. Might need to use fopen()
*
* @param string
* @param string
* @param boolean
* @return integer
*/
public function importSqlFile($filename, $callback=false, $abort_on_error=true)
{
if ($callback && !is_callable($callback)) {
throw new Exception("Invalid callback function.");
}
$lines = $this->loadFile($filename);
$num_queries = 0;
$sql_line = 0;
$sql = '';
$in_comment = false;
foreach ($lines as $num => $line) {
$line = trim($line);
$num++;
if (empty($sql)) $sql_line = $num;
// ignore comments
if ($in_comment) {
$comment = strpos($line, '*/');
if ($comment !== false) {
$in_comment = false;
$line = substr($line, $comment+2);
} else {
continue;
}
} else {
$comment = strpos($line, '/*');
if ($comment !== false) {
if (strpos($line, '*/') === false) {
$in_comment = true;
}
$line = substr($line, 0, $comment);
} else {
// single line comments
foreach (array('-- ', '#') as $chars) {
$comment = strpos($line, $chars);
if ($comment !== false) {
$line = substr($line, 0, $comment);
}
}
}
}
// check if the statement is ready to be queried
$end = strpos($line, ';');
if ($end === false) {
$sql .= $line;
} else {
$sql .= substr($line, 0, $end);
$result = $this->quickQuery($sql);
$num_queries++;
if (!$result && $abort_on_error) {
$file = basename($filename);
$error = mysqli_error($this->link);
throw new Exception("Error in $file on line $sql_line: $error");
}
if ($callback) {
call_user_func($callback, $sql_line, $sql, $result);
}
$sql = ''; // clear for next statement
}
}
return $num_queries;
}
/**
* Is Connected
*
* Determines if there is a connection open to the database.
*
* @return boolean
*/
public function isConnected()
{
if (!empty($this->link)) {
return @mysqli_ping($this->link);
} else {
return false;
}
}
// insertPhpArray
// insertSqlArray
// sqlval()
/**
* Insert
*
* Executes the INSERT statement specified in the query and returns the
* value from either the PHP {@link mysql_insert_id()} function or the
* php {@link mysql_affected_rows()} function depending on the value of the
* $return_type parameter.
*
* <code>
* $db = MySqlDatabase::getInstance();
* $query = "INSERT INTO foobar (col1, col2) VALUES (1, 2), (2, 3)";
* $rows = $db->insert($query, MySqlDatabase::INSERT_GET_AFFECTED_ROWS);
* echo $rows; // output: 2
* </code>
*
*
* @param string
* @param integer
* @return integer
*/
public function insert($query, $r_type=MySqlDatabase::INSERT_GET_AUTO_INCREMENT_ID)
{
$r = $this->query($query);
if ($r_type == MySqlDatabase::INSERT_GET_AFFECTED_ROWS) {
return @mysqli_affected_rows($this->link);
} else {
return @mysqli_insert_id($this->link);
}
}
/**
* DO NOT USE
*
* This was never finished... I don't think. The goal was to take a table
* name, an array of column names, and an array of values and generate a
* multiple record insert. You should not use this, but, you could help
* out and finish or rewrite this method.
*
*
* @param deprecated
*/
public function smartInsert($table, $columns, $values)
{
if (empty($table) || !is_string($table)) {
throw new Exception('The $table parameter must be specified as a string.');
}
$table_sql = '`' . @mysqli_real_escape_string($table) . '`';
$query = "INSERT INTO $table_sql ";
// columns
if (is_string($columns)) {
$columns = explode(',', $columns);
}
if (is_array($columns)) {
foreach ($columns as &$col) {
if (!is_string($col)) {
throw new Exception('The $columns parameter must be a string or an array of strings');
}
$col = @mysql_real_escape_string($col);
}
$column_sql = implode(',', $columns);
$column_count = count($columns);
} else {
throw new Exception('The $columns parameter must be a string or an array of strings.');
}
try {
$column_info = array();
foreach ($this->iterate("SHOW COLUMNS FROM $table_sql") as $row) {
$column_info[] = $row;
}
}
catch (Exception $e) {
throw new Exception("Could not get column information for table $table_sql.");
}
$query .= "($column_sql) ";
// values
if (is_array($values)) {
for ($i=0; $i < count($values); $i++) {
$info = $column_info[$i];
$value = $values[i];
// Where the heck did I leave off?
}
} else {
// TODO: if only 1 column, then this will work
throw new Exception('The $values parameter must be a string or an array.');
}
if (isset($column_count) && $column_count <> $value_count) {
throw new Exception("Column count ($column_count) does not match values count ($value_count).");
}
$query .= "VALUES ($value_sql) ";
echo $query;
}
/**
* Iterate Result Set
*
* Returns a {@link MySQL_ResultSet} iteratable object for a query. The $type
* parameter indicates the data being iterated should be an object,
* a numerically indexed array, an associative array, or an array with
* both numeric and associative indexes. Defaults to objects.
*
* <code>
* $sql_query = "SELECT col1, col2 FROM table";
*
* // iterate as objects
* foreach ($db->iterate("SELECT col1, col2 FROM table") as $row) {
* echo $row->col1 . '<br/>';
* echo $row->col2 . '<br/>';
* }
*
* // iterate as both associative and numerically indexed array
* foreach ($db->iterate($sql_query, MySQL_Db::DATA_ARRAY) as $row) {
* echo $row[0] . '<br/>';
* echo $row['col1'] . '<br/>';
* }
* </code>
*
* @param string
* @param integer
* @return boolean
*/
public function iterate($sql, $data_type=MySqlResultSet::DATA_OBJECT)
{
return new MySqlResultSet($sql, $data_type, $this->link);
}
/**
* Load File
*
* Loads the specified filename into an array of lines. Throws an exception
* if there is an error.
*
* @param string
* @return boolean
*/
private function loadFile($filename)
{
if (!file_exists($filename)) {
throw new Exception("File does not exist: $filename");
}
$file = @file($filename, FILE_IGNORE_NEW_LINES);
if (!$file) {
throw new Exception("Could not open $filename");
}
return $file;
}
public function query($query)
{
$r = @mysqli_query($query, $this->link);
if (!$r) {
throw new Exception("Query Error: " . mysqli_error());
}
return $r;
}
/**
* Quick Query
*
* Executes a MySQL query and returns a boolean value indicating success
* or failure. This method will close any resources opened from
* SELECT, SHOW, DESCRIBE, or EXPLAIN statements and would not be very
* usefull for those types of queries. This method is used internally for
* importing SQL scripts.
*
* @param string
* @return boolean
*/
public function quickQuery($query)
{
$r = @mysqli_query($query, $this->link);
if (!$r) return false;
if (is_resource($r)) mysqli_free_result($r);
return true;
}
/**
* Update
*
* Executes the UPDATE statement specified in the query and returns the
* value from either the PHP {@link mysql_affected_rows()} function. Throws
* and exception if there is a MySQL error in the query.
*
* Note: The number of rows affected include only those in which the new
* value was not the same as the old value. See {@link mysql_affected_rows()}
* for more information.
*
* @param string
* @return integer
*/
public function update($query)
{
return $this->updateOrDelete($query);
}
private function updateOrDelete($query)
{
$r = $this->query($query);
return @mysqli_affected_rows($this->link);
}
/**
* Use Database
*
* Selects the database to use. Throws an exception if there is an error
* using the specified database.
*
* @param string
* @return integer
*/
public function useDatabase($database)
{
if ([email protected]_select_db($database, $this->link))
{
throw new Exception('Unable to select database: ' . mysqli_error($this->link));
}
}
}
?>
あなたの主な問題は*エラー報告*失敗です。あなたはいつも[すべてのPHPエラーが報告されている]（https://phpdelusions.net/articles/error_reporting）にする必要がありますので、推測する必要はありません –