1 files changed, 403 insertions, 0 deletions
diff --git a/phpBB/phpbb/db/extractor/mysql_extractor.php b/phpBB/phpbb/db/extractor/mysql_extractor.php
new file mode 100644
index 0000000000..34e309c19e
--- /dev/null
+++ b/phpBB/phpbb/db/extractor/mysql_extractor.php
@@ -0,0 +1,403 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db\extractor;
+
+use phpbb\db\extractor\exception\extractor_not_initialized_exception;
+
+class mysql_extractor extends base_extractor
+{
+	/**
+	* {@inheritdoc}
+	*/
+	public function write_start($table_prefix)
+	{
+		if (!$this->is_initialized)
+		{
+			throw new extractor_not_initialized_exception();
+		}
+
+		$sql_data = "#\n";
+		$sql_data .= "# phpBB Backup Script\n";
+		$sql_data .= "# Dump of tables for $table_prefix\n";
+		$sql_data .= "# DATE : " . gmdate("d-m-Y H:i:s", $this->time) . " GMT\n";
+		$sql_data .= "#\n";
+		$this->flush($sql_data);
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function write_table($table_name)
+	{
+		static $new_extract;
+
+		if (!$this->is_initialized)
+		{
+			throw new extractor_not_initialized_exception();
+		}
+
+		if ($new_extract === null)
+		{
+			if ($this->db->get_sql_layer() === 'mysqli' || version_compare($this->db->sql_server_info(true), '3.23.20', '>='))
+			{
+				$new_extract = true;
+			}
+			else
+			{
+				$new_extract = false;
+			}
+		}
+
+		if ($new_extract)
+		{
+			$this->new_write_table($table_name);
+		}
+		else
+		{
+			$this->old_write_table($table_name);
+		}
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function write_data($table_name)
+	{
+		if (!$this->is_initialized)
+		{
+			throw new extractor_not_initialized_exception();
+		}
+
+		if ($this->db->get_sql_layer() === 'mysqli')
+		{
+			$this->write_data_mysqli($table_name);
+		}
+		else
+		{
+			$this->write_data_mysql($table_name);
+		}
+	}
+
+	/**
+	* Extracts data from database table (for MySQLi driver)
+	*
+	* @param	string	$table_name	name of the database table
+	* @return null
+	* @throws \phpbb\db\extractor\exception\extractor_not_initialized_exception when calling this function before init_extractor()
+	*/
+	protected function write_data_mysqli($table_name)
+	{
+		if (!$this->is_initialized)
+		{
+			throw new extractor_not_initialized_exception();
+		}
+
+		$sql = "SELECT *
+			FROM $table_name";
+		$result = mysqli_query($this->db->get_db_connect_id(), $sql, MYSQLI_USE_RESULT);
+		if ($result != false)
+		{
+			$fields_cnt = mysqli_num_fields($result);
+
+			// Get field information
+			$field = mysqli_fetch_fields($result);
+			$field_set = array();
+
+			for ($j = 0; $j < $fields_cnt; $j++)
+			{
+				$field_set[] = $field[$j]->name;
+			}
+
+			$search			= array("\\", "'", "\x00", "\x0a", "\x0d", "\x1a", '"');
+			$replace		= array("\\\\", "\\'", '\0', '\n', '\r', '\Z', '\\"');
+			$fields			= implode(', ', $field_set);
+			$sql_data		= 'INSERT INTO ' . $table_name . ' (' . $fields . ') VALUES ';
+			$first_set		= true;
+			$query_len		= 0;
+			$max_len		= get_usable_memory();
+
+			while ($row = mysqli_fetch_row($result))
+			{
+				$values	= array();
+				if ($first_set)
+				{
+					$query = $sql_data . '(';
+				}
+				else
+				{
+					$query  .= ',(';
+				}
+
+				for ($j = 0; $j < $fields_cnt; $j++)
+				{
+					if (!isset($row[$j]) || is_null($row[$j]))
+					{
+						$values[$j] = 'NULL';
+					}
+					else if (($field[$j]->flags & 32768) && !($field[$j]->flags & 1024))
+					{
+						$values[$j] = $row[$j];
+					}
+					else
+					{
+						$values[$j] = "'" . str_replace($search, $replace, $row[$j]) . "'";
+					}
+				}
+				$query .= implode(', ', $values) . ')';
+
+				$query_len += strlen($query);
+				if ($query_len > $max_len)
+				{
+					$this->flush($query . ";\n\n");
+					$query = '';
+					$query_len = 0;
+					$first_set = true;
+				}
+				else
+				{
+					$first_set = false;
+				}
+			}
+			mysqli_free_result($result);
+
+			// check to make sure we have nothing left to flush
+			if (!$first_set && $query)
+			{
+				$this->flush($query . ";\n\n");
+			}
+		}
+	}
+
+	/**
+	* Extracts data from database table (for MySQL driver)
+	*
+	* @param	string	$table_name	name of the database table
+	* @return null
+	* @throws \phpbb\db\extractor\exception\extractor_not_initialized_exception when calling this function before init_extractor()
+	*/
+	protected function write_data_mysql($table_name)
+	{
+		if (!$this->is_initialized)
+		{
+			throw new extractor_not_initialized_exception();
+		}
+
+		$sql = "SELECT *
+			FROM $table_name";
+		$result = mysql_unbuffered_query($sql, $this->db->get_db_connect_id());
+
+		if ($result != false)
+		{
+			$fields_cnt = mysql_num_fields($result);
+
+			// Get field information
+			$field = array();
+			for ($i = 0; $i < $fields_cnt; $i++)
+			{
+				$field[] = mysql_fetch_field($result, $i);
+			}
+			$field_set = array();
+
+			for ($j = 0; $j < $fields_cnt; $j++)
+			{
+				$field_set[] = $field[$j]->name;
+			}
+
+			$search			= array("\\", "'", "\x00", "\x0a", "\x0d", "\x1a", '"');
+			$replace		= array("\\\\", "\\'", '\0', '\n', '\r', '\Z', '\\"');
+			$fields			= implode(', ', $field_set);
+			$sql_data		= 'INSERT INTO ' . $table_name . ' (' . $fields . ') VALUES ';
+			$first_set		= true;
+			$query_len		= 0;
+			$max_len		= get_usable_memory();
+
+			while ($row = mysql_fetch_row($result))
+			{
+				$values = array();
+				if ($first_set)
+				{
+					$query = $sql_data . '(';
+				}
+				else
+				{
+					$query  .= ',(';
+				}
+
+				for ($j = 0; $j < $fields_cnt; $j++)
+				{
+					if (!isset($row[$j]) || is_null($row[$j]))
+					{
+						$values[$j] = 'NULL';
+					}
+					else if ($field[$j]->numeric && ($field[$j]->type !== 'timestamp'))
+					{
+						$values[$j] = $row[$j];
+					}
+					else
+					{
+						$values[$j] = "'" . str_replace($search, $replace, $row[$j]) . "'";
+					}
+				}
+				$query .= implode(', ', $values) . ')';
+
+				$query_len += strlen($query);
+				if ($query_len > $max_len)
+				{
+					$this->flush($query . ";\n\n");
+					$query = '';
+					$query_len = 0;
+					$first_set = true;
+				}
+				else
+				{
+					$first_set = false;
+				}
+			}
+			mysql_free_result($result);
+
+			// check to make sure we have nothing left to flush
+			if (!$first_set && $query)
+			{
+				$this->flush($query . ";\n\n");
+			}
+		}
+	}
+
+	/**
+	* Extracts database table structure (for MySQLi or MySQL 3.23.20+)
+	*
+	* @param	string	$table_name	name of the database table
+	* @return null
+	* @throws \phpbb\db\extractor\exception\extractor_not_initialized_exception when calling this function before init_extractor()
+	*/
+	protected function new_write_table($table_name)
+	{
+		if (!$this->is_initialized)
+		{
+			throw new extractor_not_initialized_exception();
+		}
+
+		$sql = 'SHOW CREATE TABLE ' . $table_name;
+		$result = $this->db->sql_query($sql);
+		$row = $this->db->sql_fetchrow($result);
+
+		$sql_data = '# Table: ' . $table_name . "\n";
+		$sql_data .= "DROP TABLE IF EXISTS $table_name;\n";
+		$this->flush($sql_data . $row['Create Table'] . ";\n\n");
+
+		$this->db->sql_freeresult($result);
+	}
+
+	/**
+	* Extracts database table structure (for MySQL verisons older than 3.23.20)
+	*
+	* @param	string	$table_name	name of the database table
+	* @return null
+	* @throws \phpbb\db\extractor\exception\extractor_not_initialized_exception when calling this function before init_extractor()
+	*/
+	protected function old_write_table($table_name)
+	{
+		if (!$this->is_initialized)
+		{
+			throw new extractor_not_initialized_exception();
+		}
+
+		$sql_data = '# Table: ' . $table_name . "\n";
+		$sql_data .= "DROP TABLE IF EXISTS $table_name;\n";
+		$sql_data .= "CREATE TABLE $table_name(\n";
+		$rows = array();
+
+		$sql = "SHOW FIELDS
+			FROM $table_name";
+		$result = $this->db->sql_query($sql);
+
+		while ($row = $this->db->sql_fetchrow($result))
+		{
+			$line = '   ' . $row['Field'] . ' ' . $row['Type'];
+
+			if (!is_null($row['Default']))
+			{
+				$line .= " DEFAULT '{$row['Default']}'";
+			}
+
+			if ($row['Null'] != 'YES')
+			{
+				$line .= ' NOT NULL';
+			}
+
+			if ($row['Extra'] != '')
+			{
+				$line .= ' ' . $row['Extra'];
+			}
+
+			$rows[] = $line;
+		}
+		$this->db->sql_freeresult($result);
+
+		$sql = "SHOW KEYS
+			FROM $table_name";
+
+		$result = $this->db->sql_query($sql);
+
+		$index = array();
+		while ($row = $this->db->sql_fetchrow($result))
+		{
+			$kname = $row['Key_name'];
+
+			if ($kname != 'PRIMARY')
+			{
+				if ($row['Non_unique'] == 0)
+				{
+					$kname = "UNIQUE|$kname";
+				}
+			}
+
+			if ($row['Sub_part'])
+			{
+				$row['Column_name'] .= '(' . $row['Sub_part'] . ')';
+			}
+			$index[$kname][] = $row['Column_name'];
+		}
+		$this->db->sql_freeresult($result);
+
+		foreach ($index as $key => $columns)
+		{
+			$line = '   ';
+
+			if ($key == 'PRIMARY')
+			{
+				$line .= 'PRIMARY KEY (' . implode(', ', $columns) . ')';
+			}
+			else if (strpos($key, 'UNIQUE') === 0)
+			{
+				$line .= 'UNIQUE ' . substr($key, 7) . ' (' . implode(', ', $columns) . ')';
+			}
+			else if (strpos($key, 'FULLTEXT') === 0)
+			{
+				$line .= 'FULLTEXT ' . substr($key, 9) . ' (' . implode(', ', $columns) . ')';
+			}
+			else
+			{
+				$line .= "KEY $key (" . implode(', ', $columns) . ')';
+			}
+
+			$rows[] = $line;
+		}
+
+		$sql_data .= implode(",\n", $rows);
+		$sql_data .= "\n);\n\n";
+
+		$this->flush($sql_data);
+	}
+}