MySQL的備份

原本想著用SHOW CREATE TABLE ergodic 來做備份的但是發現如果Table 有 comment 而且還是亂碼的話，會導致SHOW CREATE TABLE 出來的腳本缺少一個符號。所以有了這個版本。

 class MysqlExport{

 /**
 * 資料庫連線
*/
 private $_db;
 /**
 * 建立表格結構sql
*/
 private $_create_table = '';

 public function __construct($host = '', $user = '', $ pass = '', $db = '', $port = 3306) {
 if (empty($host) ||empty($user)) {

 } else {
 $this - >real_connect($host, $user, $pass, $db, $port);
 }
 }

 public function init() {
 return $this;
 }

 /**
 * 連接資料庫
*/
 public function real_connect($host, $user, $pass, $db = '', $port = 3306) {
 $this- >_db = mysql_connect($host . ':' . $port, $user, $pass);
 if ($db) {
 $this->select_db($db);
 }
 return $this->init();
 }

 /**
 * 選擇資料庫
*/
 public function select_db($db) {
 if (mysql_select_db($ db, $this-this-this-this- >_db)) {
 return true;
 }
 }

 /**
 * 查詢語句
*/
 public function query($sql) {
 if ($ this->_db) {
 if ($this->_resource = mysql_query($sql, $this->_db)) {
 return $this->init( );
 }
 }
 拋出新例外($this->get_error());
 }

 /**
 * 取得結果集
*/
 公用函數fetch_array($arg = MYSQL_BOTH) {
 $result = array();
 if ($this->_resource && !mysql_errno($this->_db)) {
 while ($rs = mysql_fetch_array($this->_resource, $arg)) {
 $result[] = $rs;
 }
 }
 return $result;
 }

 /**
 * 取得錯誤
*/
 公用函數get_error() {
 return mysql_errno($this->_db) 。 "n";
 }

 /**
 * 顯示資料表
*/
 public function show_tables($table = '') {
 $sql = "SHOW TABLES";
 $sql .= $表 ? " LIKE '{$table}'" : '';
 $result = $this->query($sql)->fetch_array(MYSQL_ASSOC);
 return $result;
 }

 /**
 * 顯示資料表欄位
*/
 public function show_columns($table) {
 if (empty($table)) {
 return array();
 }
 $sql = "顯示{$table} 中的完整欄位";
 $result = $this->query($sql)->fetch_array(MYSQL_ASSOC);
 return $result;
 }

 /**
 * 顯示資料表狀態
*/
 public function show_table_status($table) {
 if (empty($table)) {
 return array();
 }
 $result🎜 > $result🎜 > $result🎜 > $result🎜 > $result🎜 > $result🎜 > $result🎜 > $result🎜 > $result🎜 > $result = $this->query("SHOW TABLE STATUS LIKE '{$table}'")->fetch_array(MYSQL_ASSOC);
 $result = reset($result);
 return $result ;
 } }

 /**
 * 顯示資料表結構
*/
 public function show_create_table($table) {
 if (empty($table)) {
 return '';
 }
 }
 $this->_create_table = "如果不存在`{$table}`(" . PHP_EOL;
 $table_status = $this->show_table_status($table);
 $columns = $this->show_columns( $table)

 foreach ($columns AS $col) {
 $this->_create_table .= "`{$col['Field']; }` {$col['Type']} NOT NULL {$col['Extra']}," . PHP_EOL;
 }

 $this->_create_table .= $this->create_indexSyntax($table);

 $ char = substr($table_status['Collat​​e'], 0, strpos($table_status['Collat​​ion'], '_'));
 $table_status['Auto_increment'] = $table_status[ '自動增量'] ? $table_status['Auto_increment'] : 0;
 $this->_create_table .= ")Engine={$table_status['Engine']} AUTO_INCRMENT={$table_status['Auto_increment']} 預設字元集={$字元}；” str_repeat(PHP_EOL, 3);

 return $this->_create_table;
 }

 /**
 * 顯示觸發器
*/
 public function show_constraint($ 🎜> if (empty($db_name)) {
 return array();
 }
 $sql = "SELECT a.CONSTRAINT_NAME AS constrint_name, a.TABLE_name AS table_name, a.COLU .REFERENCED_TABLE_NAME 作為引用的表名稱、a.REFERENCED_COLUMN_作為引用的列名稱、b.UPDATE_RULE 作為更新規則、b.DELETE_RULE AS 刪除規則FROM information_schema.KEY_COLUMN_USAGE 為項目基金constraint_name E a.constraint_schema = ' {$db_name}' AND a.POSITION_IN_UNIQUE_CONSTRAINT = 1";
 $result = $this->query($sql)->fetch_array(MYSQL_ASSOC);
 }
 🎜> /**
 * 顯示索引
*/
 public function show_index($table) {
 if (empty($table)) {
 return array();
 }
 $sql = "SHOW INDEX FROM {$table}";
 $result = $this->query($sql)->fetch_array(MYSQL_ASSOC);
 return $result;
 }

 /**
 * 顯示資料庫結構
*/
 public function show_database_char() {
 $sql = "顯示變數如'character_set_database'";
 $char = $this->; query($sql)->fetch_array(MYSQL_ASSOC);
 return reset($char);
 }

 /**
 * 建立索引語法
*/
 public function create_indexSyntax($table) {
 if (empty($table)) {
 return array();
 }
 $indexing = $this->show_index($table);
 $syntax = array () ;
 $indexSyntax = array();
 foreach ($indexing as $index) {
 $syntax[$index['Index_type']][$index['Key_name']][] = $ index['Column_name'];
 }

 foreach ($syntax as $index_type => $index_value) {
 foreach ($index_value as $key_name => $columns) {
 foreach ($index_value as $key_name => $columns) {
 if ($key_name == 'PRIMARY') {
 $indexSyntax[] = 'PRIMARY KEY (`' . implode("`,`", $columns) . '`)';
 } else {
 if ($index_type == 'FULLTEXT') {
 $indexSyntax[] = "FULLTEXT KEY `{$key_name}` (`" .內爆("`,`", $columns) 。 '`)' ;
 } else{
 $indexSyntax[] = "KEY `{$key_name}` 使用{$index_type} (`" . implode("`,`", $columns) . '` )';
 }
 }
 }
 }

 return implode(',' . PHP_EOL, $indexSyntax) 。 🎝>*/
 public function create_insertSyntax($table) {
 if (empty($table)) {
 return '';
 }
 $sql = "SELECT * FROM {$table}";
 $result = $this->query($sql)->fetch_array(MYSQL_ASSOC);
 $insertStr = '' ;
 if ($result) {
 $first = reset($result);
 $key = implode('`,`', array_keys($first));
 $insert = " INSERT INTO `{$table}` (`{$key}`) VALUES ";
 $valuesStr = array();
 foreach ($result as $value) {
 $values = array () ;
 foreach ($value as $v) {
 $v = mysql_real_escape_string($v);
 $values[] = preg_replace("#\ #", "\", $v) ;
 }
 $valuesStr[] = "('" .implode("','", $values) . "')";
 }
 $valuesStr = array_chunk($valuesStr, 5000) ;
 foreach ($valuesStr as $str) {
 $insertStr .= $insert .內爆(',', $str) 。 PHP_EOL;
 }

 }
 回傳 $insertStr 。
 $test = new MysqlExport('localhost', 'root', '', 'pm_cms');
 $char = $test->show_database_char();
 $test->query("設定名稱{$char['Value']}");
 $tables = $test->show_tables();
 foreach ($tables as $table) {
 list($table_name) = array_values ( $table);
 $export .= $test->show_create_table ($table_name);
 $export .= $test->create_insertSyntax($table_name);
 }
 $fp = fopenopen ( 'pm_cms.sql', 'w');
 fwrite ($fp, $export);
 fclose($fp);
?>


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