mysql备份的PHP脚本

PHP: 

---


<?php   
    // 备份数据库   
    function sqldumptable($table, $fp=0) {   
        $tabledump = "DROP TABLE IF EXISTS `$table`;\n";   
        $tabledump .= "CREATE TABLE `$table` (\n";   
   
        $firstfield=1;   
   
        $fields = mysql_query("SHOW FIELDS FROM `$table`");   
        while ($field = mysql_fetch_array($fields)) {   
            if (!$firstfield) {   
                $tabledump .= ",\n";   
            } else {   
                $firstfield=0;   
            }   
            $tabledump .= "   `$field[Field]` $field[Type]";   
            if (!emptyempty($field["Default"])) {   
                if($field['Default']!='CURRENT_TIMESTAMP' ) $field['Default'] = "'{$field['Default']}'";   
                $tabledump .= " DEFAULT $field[Default]";   
            }   
            if ($field['Null'] != "YES") {   
                $tabledump .= " NOT NULL";   
            }   
            if ($field['Extra'] != "") {   
                $tabledump .= " $field[Extra]";   
            }   
        }   
        mysql_free_result($fields);   
       
        $keys = mysql_query("SHOW KEYS FROM `$table`");   
        while ($key = mysql_fetch_array($keys)) {   
            $kname=$key['Key_name'];   
            if ($kname != "PRIMARY" and $key['Non_unique'] == 0) {   
                $kname="UNIQUE|$kname";   
            }   
            if(!is_array($index[$kname])) {   
                $index[$kname] = array();   
            }   
            $index[$kname][] = $key['Column_name'];   
        }   
        mysql_free_result($keys);   
   
        while(list($kname, $columns) = @each($index)) {   
            $tabledump .= ",\n";   
            $colnames=implode($columns,",");   
   
            if ($kname == "PRIMARY") {   
                $tabledump .= "   PRIMARY KEY ($colnames)";   
            } else {   
                if (substr($kname,0,6) == "UNIQUE") {   
                    $kname=substr($kname,7);   
                }   
                $tabledump .= "   KEY $kname ($colnames)";   
            }   
        }   
   
        $tabledump .= "\n);\n\n";   
        if ($fp) {   
            fwrite($fp,$tabledump);   
        } else {   
            echo $tabledump;   
        }   
   
        $rows = mysql_query("SELECT * FROM `$table`");   
        $numfields = mysql_num_fields($rows);   
        while ($row = mysql_fetch_array($rows)) {   
            $tabledump = "INSERT INTO `$table` VALUES(";   
   
            $fieldcounter=-1;   
            $firstfield=1;   
            while (++$fieldcounter<$numfields) {   
                if (!$firstfield) {   
                    $tabledump.=", ";   
                } else {   
                    $firstfield=0;   
                }   
   
                if (!isset($row[$fieldcounter])) {   
                    $tabledump .= "NULL";   
                } else {   
                    $tabledump .= "'".mysql_escape_string($row[$fieldcounter])."'";   
                }   
            }   
   
            $tabledump .= ");\n";   
   
            if ($fp) {   
                fwrite($fp,$tabledump);   
            } else {   
                echo $tabledump;   
            }   
        }   
        mysql_free_result($rows);   
        fwrite($fp,"\n\n\n");   
    }   
   
?>