下面是我的数据库备份代码。
$this->load->database();
$this->load->dbutil();
$backup =& $this->dbutil->backup();
$prefs = array(
'format' => 'txt',
'filename' => 'mybackup.sql', );
$path=$this->config->base_url()."database/";
$this->load->helper('file');
write_file($path, $backup);
$this->load->helper('download');
force_download('mybackup.gz', $backup);
使用
时效果很好$db['default']['dbdriver'] = 'mysql';
但它给出了错误
$db['default']['dbdriver'] = 'mysqli';
error:Unsupported feature of the database platform you are using.
如何使用“mysqli”我需要在我的项目中支持mysqli。
答案 0 :(得分：8)
这对我不利，然后我打开文件＆＃34; system \ database \ drivers \ mysqli \ mysqli_utility.php＆＃34;并改变功能＆＃34; _backup＆＃34;对此：
/**
* MySQLi Export
*
* @access private
* @param array Preferences
* @return mixed
*/
function _backup($params = array())
{
// Currently unsupported
//---return $this->db->display_error('db_unsuported_feature');
if (count($params) == 0)
{
return FALSE;
}
// Extract the prefs for simplicity
extract($params);
// Build the output
$output = '';
foreach ((array)$tables as $table)
{
// Is the table in the "ignore" list?
if (in_array($table, (array)$ignore, TRUE))
{
continue;
}
// Get the table schema
$query = $this->db->query("SHOW CREATE TABLE `".$this->db->database.'`.`'.$table.'`');
// No result means the table name was invalid
if ($query === FALSE)
{
continue;
}
// Write out the table schema
$output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;
if ($add_drop == TRUE)
{
$output .= 'DROP TABLE IF EXISTS '.$table.';'.$newline.$newline;
}
$i = 0;
$result = $query->result_array();
foreach ($result[0] as $val)
{
if ($i++ % 2)
{
$output .= $val.';'.$newline.$newline;
}
}
// If inserts are not needed we're done...
if ($add_insert == FALSE)
{
continue;
}
// Grab all the data from the current table
$query = $this->db->query("SELECT * FROM $table");
if ($query->num_rows() == 0)
{
continue;
}
// Fetch the field names and determine if the field is an
// integer type. We use this info to decide whether to
// surround the data with quotes or not
$i = 0;
$field_str = '';
$is_int = array();
while ($field = mysqli_fetch_field($query->result_id))
{
// Most versions of MySQL store timestamp as a string
$is_int[$i] = (in_array(
//strtolower(mysqli_field_type($query->result_id, $i)),
strtolower($field->type),
array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'),
TRUE)
) ? TRUE : FALSE;
// Create a string of field names
$field_str .= '`'.$field->name.'`, ';
$i++;
}
// Trim off the end comma
$field_str = preg_replace( "/, $/" , "" , $field_str);
// Build the insert string
foreach ($query->result_array() as $row)
{
$val_str = '';
$i = 0;
foreach ($row as $v)
{
// Is the value NULL?
if ($v === NULL)
{
$val_str .= 'NULL';
}
else
{
// Escape the data if it's not an integer
if ($is_int[$i] == FALSE)
{
$val_str .= $this->db->escape($v);
}
else
{
$val_str .= $v;
}
}
// Append a comma
$val_str .= ', ';
$i++;
}
// Remove the comma at the end of the string
$val_str = preg_replace( "/, $/" , "" , $val_str);
// Build the INSERT string
$output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
}
$output .= $newline.$newline;
}
return $output;
}
如果你需要改变......
更改所有＆＃34; mysql _...＆＃34;到＆＃34; mysqli ......＆＃34;
和行
strtolower(mysqli_field_type($query->result_id, $i)),
到此
strtolower($field->type),
中提琴！那太棒了......
答案 1 :(得分：1)
您的mysqli驱动程序不支持此功能。
答案 2 :(得分：1)
这是备份任何大小的所有数据库的函数的扩展。
此代码将使用文件系统（缓存文件夹）和SQL LIMITS删除导出数据库时的PHP内存限制。
我希望这对某人有用。
替换功能 _backup（$ params = array（））
文件：system / drivers / mysqli / mysqli_utility.php
/**
* MySQLi Export
*
* @access private
* @param array Preferences
* @return mixed
*/
function _backup_old($params = array())
{
// Currently unsupported
return $this->db->display_error('db_unsuported_feature');
}
/**
* MySQLi Export
*
* @access private
* @param array Preferences
* @return mixed
*/
function _backup($params = array())
{
// Currently unsupported
//---return $this->db->display_error('db_unsuported_feature');
if (count($params) == 0)
{
return FALSE;
}
// Extract the prefs for simplicity
extract($params);
// Build the output
$output = '';
foreach ((array)$tables as $table)
{
// Temp file to reduce change of OOM Killer
$tempfilepath = APPPATH . DIRECTORY_SEPARATOR . 'cache' . DIRECTORY_SEPARATOR;
$tempfile = $tempfilepath . 'dbbkp_tmp_' . time() . '.sql';
// Is the table in the "ignore" list?
if (in_array($table, (array)$ignore, TRUE))
{
continue;
}
// Get the table schema
$query = $this->db->query("SHOW CREATE TABLE `".$this->db->database.'`.`'.$table.'`');
// No result means the table name was invalid
if ($query === FALSE)
{
continue;
}
// Write out the table schema
$output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;
if ($add_drop == TRUE)
{
$output .= 'DROP TABLE IF EXISTS '.$table.';'.$newline.$newline;
}
$i = 0;
$result = $query->result_array();
foreach ($result[0] as $val)
{
if ($i++ % 2)
{
$output .= $val.';'.$newline.$newline;
}
}
// Write $output to the $filename file
file_put_contents( $filename, $output, LOCK_EX );
$output = '';
// If inserts are not needed we're done...
if ($add_insert == FALSE)
{
continue;
}
// Grab all the data from the current table
//$query = $this->db->query("SELECT * FROM $table"); // OLD
$countResult = $this->db->query("SELECT COUNT(*) AS `count` FROM " . $table . ";");
$countReturn = $countResult->result_array();
$totalCount = $countReturn[0]['count'];
//if ($query->num_rows() == 0) // OLD
if ($totalCount == 0)
{
continue;
}
// Chunk Vars
$chunkSize = 10000;
$from = 0;
$resultArray = array();
if (isset($chunk_size))
{
$chunkSize = $chunk_size;
}
// Write out the table schema
$output .= '#'.$newline.'# TABLE DATA FOR: '.$table.$newline.'#'.$newline.$newline;
// Write $output to the $filename file
file_put_contents( $filename, $output, FILE_APPEND | LOCK_EX );
// Fetch the field names and determine if the field is an
// integer type. We use this info to decide whether to
// surround the data with quotes or not
$query = $this->db->query("SELECT * FROM " . $table . " LIMIT 1;");
$i = 0;
$field_str = '';
$is_int = array();
while ($field = mysqli_fetch_field($query->result_id))
{
// Most versions of MySQL store timestamp as a string
$is_int[$i] = (in_array(
//strtolower(mysqli_field_type($query->result_id, $i)),
strtolower($field->type),
array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'),
TRUE)
) ? TRUE : FALSE;
// Create a string of field names
$field_str .= '`'.$field->name.'`, ';
$i++;
}
// Trim off the end comma
$field_str = preg_replace( "/, $/" , "" , $field_str);
// Pull the data in chunks
while($from < $totalCount)
{
// empty $output
$output = '';
// Execute a limited query:
$dataChunkQuery = $this->db->query('SELECT * FROM ' . $table . ' LIMIT ' . $from . ', ' . $chunkSize . ';');
$dataChunkRows = $dataChunkQuery->result_array();
// Increase $from:
$from += $chunkSize;
// Build the insert string
//foreach ($query->result_array() as $row) // OLD
//var_dump($resultArray); die();
foreach ($dataChunkRows as $row)
{
$val_str = '';
$i = 0;
foreach ($row as $v)
{
// Is the value NULL?
if ($v === NULL)
{
$val_str .= 'NULL';
}
else
{
// Escape the data if it's not an integer
if ($is_int[$i] == FALSE)
{
$val_str .= $this->db->escape($v);
}
else
{
$val_str .= $v;
}
}
// Append a comma
$val_str .= ', ';
$i++;
}
// Remove the comma at the end of the string
$val_str = preg_replace( "/, $/" , "" , $val_str);
// Build the INSERT string
$output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
}
// Write $output to the $filename file
file_put_contents( $filename, $output, FILE_APPEND | LOCK_EX );
sleep(1); // used to help reduce the CPU load
}
}
if( file_exists($filename) ) {
return true;
} else {
return false;
}
}
为数据库备份构建的CI模型
FILE：models / databasebackup_model.php
<?php
/**
* Database Backup
* - Used to make backups of the database system
* @author Adan Rehtla <adan.rehtla@aamcommercial.com.au>
*/
class Databasebackup_model extends API_Model {
private $CI;
private $lpFilePath = APPPATH . 'cache/backup/';
// Tables to ignore when doing a backup
private $laIgnoreTables = array(
'ci_sessions',
'any_other_tables_to_ignore'
);
/**
* Constructor
* @author Adan Rehtla <adan.rehtla@aamcommercial.com.au>
*/
function __construct() {
parent::__construct();
$this->CI = &get_instance();
}
/**
* Check and empty the cache location for storing the backups during transit
* @author Adan Rehtla <adan.rehtla@aamcommercial.com.au>
* @return json Result
*/
public function check_cache() {
$arrRet = false;
if( ! file_exists( $this->lpFilePath ) ) {
$arrRet = mkdir( $this->lpFilePath );
$arrRet = true;
}
$files = glob( $this->lpFilePath . '*' ); // get all file names present in folder
foreach( $files as $file ){ // iterate files
if( is_file( $file ) ) unlink( $file ); // delete the file
}
return (object) $arrRet;
}
/**
* Build a list of tables to backup
* @author Adan Rehtla <adan.rehtla@aamcommercial.com.au>
* @return json Result
*/
public function find_tables() {
$arrRet = false;
if( $this->database('db_read') ) {
$this->db_read->_protect_identifiers = FALSE;
$this->db_read->start_cache();
$this->db_read->distinct();
$this->db_read->select("table_name");
$this->db_read->from("information_schema.columns");
$this->db_read->where("table_schema", $this->db->dbprefix . $this->db->database);
$this->db_read->stop_cache();
// Get List of all tables to backup
$laTableNameResult = $this->db_read->get()->result();
$this->db_read->flush_cache();
if( !empty($laTableNameResult) ) {
foreach($laTableNameResult as $loTableName) {
if( ! in_array( $loTableName->table_name, $this->laIgnoreTables ) ) {
$arrRet[] = $loTableName->table_name;
}
}
}
$this->db_read->_protect_identifiers = TRUE;
}
return (object) $arrRet;
}
/**
* Backup the database to Amazon S3
* @author Adan Rehtla <adan.rehtla@aamcommercial.com.au>
* @param interger $lpUserId Logged in User ID
* @return json Result
*/
public function backup() {
ini_set('max_execution_time', 3600); // 3600 seconds = 60 minutes
ini_set('memory_limit', '-1'); // unlimited memory
//error_reporting(E_ALL); // show errors
//ini_set('display_errors', 1); // display errors
$arrRet = array();
$lpBackupCount = 0;
$zipNumFiles = 0;
$zipStatus = 0;
if( $this->database('db_read') ) {
$this->db->save_queries = false;
$this->load->dbutil( $this->db_read, TRUE );
$laBackupTables = $this->find_tables();
if( !empty($laBackupTables) && $this->check_cache() ) {
foreach($laBackupTables as $lpTableName) {
$lpFilename = $this->lpFilePath . 'backup-' . $lpTableName . '-' . date('Ymd-His') . '.sql';
$prefs = array(
'tables' => $lpTableName,
'format' => 'sql',
'filename' => $lpFilename,
'add_drop' => TRUE,
'add_insert' => TRUE,
'newline' => "\n",
'foreign_key_checks' => TRUE,
'chunk_size' => 1000
);
if( !file_exists( $lpFilename ) ){
if( $this->dbutil->backup( $prefs ) ) {
$lpBackupCount++;
}
}
sleep(1); // used to help reduce the CPU load
//break; // used to debug and testing to only process the first database table
}
try {
// ZIP up all the individual GZIPs
$zip = new ZipArchive();
$zip_file = $this->lpFilePath . '-' . date('Ymd-His') . '.zip';
$zip_files = glob( $this->lpFilePath . 'backup-*' ); // get all file names present in folder starting with 'backup-'
if( $zip->open( $zip_file, ZIPARCHIVE::CREATE ) !== TRUE ) {
exit("cannot open <$zip_file>\n");
}
if( !empty($zip_files) ) {
foreach( $zip_files as $file_to_zip ) { // iterate files
$zip->addFile( $file_to_zip, basename( $file_to_zip ) );
}
}
$zipNumFiles = $zip->numFiles;
$zipStatus = $zip->status;
$zip->close();
} catch (Vi_exception $e) {
print( strip_tags( $e->errorMessage() ) );
}
// Upload the file to Amazon S3
// REMOVED AWS S3 UPLOAD CODE
// REMOVED AWS S3 UPLOAD CODE
// REMOVED AWS S3 UPLOAD CODE
// Clean up cache files
$this->check_cache();
}
$this->db->save_queries = true;
}
if( !empty($lpBackupCount) && !empty($zip) && !empty($zip_file) ) {
return (object) array( 'success'=>true, 'totalTables'=>$lpBackupCount, 'zipNumFiles'=>$zipNumFiles, 'zipStatus'=>$zipStatus, 'zipFile'=>$zip_file );
} else {
return (object) array( 'success'=>false );
}
}
}
<强> USAGE：
$this->load->model('databasebackup_model');
$laResult = $this->databasebackup_model->backup();