Phpmysql database backup and data restoration class _ PHP Tutorial

Phpmysql database backup and data restoration class. Note: This class applies to database backup for small websites and built-in MYSQL connections. you only need to configure the data connection and storage backup location. * Description of real-name classes and database connection. this class is applicable to database backup for small websites and has built-in MYSQL connections. you only need to configure the data connection and storage backup location. * Perform the following operations after the class is real-listed and connected to the database

Php Tutorial mysql tutorial database tutorial backup and data restoration
/**
* Description: This type is applicable to database backup for small websites and built-in mysql connections. you only need to configure data connections simply.
* And the storage backup location.
* Perform the following operations after the class is real-listed and connected to the database
* Get_db_table ($ database) obtains all data tables.
* Export_ SQL ($ table, $ subsection = 0) generates an SQL file. Note that the generated SQL file is saved only to the server directory and is not downloaded.
* Import_ SQL ($ dir) only import SQL files in the server directory to restore data
* This type is easy to create and can be spread at will. if you have any suggestions for this type, please send an email to the shrimps.
* @ Author Zhao Hongjian [Youtian shrimp]
* Email: 328742379@qq.com
* Qq chat group: 69574955 juyitang-online page creation
*/

Class data {
Public $ data_dir = "class/"; // path of the backup file
Public $ transfer = ""; // temporarily store SQL statements. [do not assign values to this attribute. Otherwise, an incorrect SQL statement is generated.]

/**
* Database connection
* @ Param string $ host name
* @ Param string $ user username
* @ Param string $ pwd password
* @ Param string $ db Select the database name
* @ Param string $ charset encoding method
*/
Function connect_db ($ host, $ user, $ pwd, $ db, $ charset = 'gbk '){
If (! $ Conn = mysql_connect ($ host, $ user, $ pwd )){
Return false;
}
Mysql_select_db ($ db );
Mysql_query ("set names $ charset ");
Return true;
}

/**
* Generate SQL statements
* @ Param $ table the table to be backed up
* @ Return $ tabledump: SQL statement generated
*/
Public function set_ SQL ($ table, $ subsection = 0, & $ tabledom = ''){
$ Tabledom. = "drop table if exists $ tablen ";
$ Createtable = mysql_query ("show create table $ table ");
$ Create = mysql_fetch_row ($ createtable );
$ Create [1] = str_replace ("n", "", $ create [1]);
$ Create [1] = str_replace ("t", "", $ create [1]);

$ Tabledom. = $ create [1]. "; n ";

$ Rows = mysql_query ("select * from $ table ");
$ Numfields = mysql_num_fields ($ rows );
$ Numrows = mysql_num_rows ($ rows );
$ N = 1;
$ Sqlarry = array ();
While ($ row = mysql_fetch_row ($ rows )){
$ Comma = "";
$ Tabledom. = "insert into $ table values (";
For ($ I = 0; $ I <$ numfields; $ I ++)
{
$ Tabledom. = $ comma. "'". mysql_escape_string ($ row [$ I]). "'";
$ Comma = ",";
}
$ Tabledom. = ") n ";
If ($ subsection! = 0 & strlen ($ this-> transfer) >=$ subsection * 1000 ){
$ Sqlarry [$ n] = $ tabledom;
$ Tabledom = ''; $ n ++;
}
}
Return $ sqlarry;
}

/**
* List tables in a database
* @ Param database $ name of the database to be operated on
* @ Return array $ database table in the dbarray list
*/
Public function get_db_table ($ database ){
$ Result = mysql_list_tables ($ database );
While ($ tmparry = mysql_fetch_row ($ result )){
$ Dbarry [] = $ tmparry [0];
}
Return $ dbarry;
}

/**
* Verify whether the directory is valid
* @ Param diretory $ dir
* @ Return booln
*/
Function check_write_dir ($ dir ){
If (! Is_dir ($ dir) {@ mkdir ($ dir, 0777 );}
If (is_dir ($ dir )){
If ($ link = opendir ($ dir )){
$ Filearry = scandir ($ dir );
For ($ I = 0; $ I If ($ filearry [$ I]! = '.' | $ Filearry! = '..'){
@ Unlink ($ dir. $ filearry [$ I]);
}
}
}
}
Return true;
}
/**
* Write data to a file
* @ Param file $ filename file name
* @ Param string $ str information to be written
* @ Return booln return true if the write is successful; otherwise, false
*/
Private function write_ SQL ($ filename, $ str ){
$ Re = true;
If (! @ $ Fp = fopen ($ filename, "w +") {$ re = false; echo "an error occurred while opening the file. backup failed! ";}
If (! @ Fwrite ($ fp, $ str) {$ re = false; echo "an error occurred while writing information. backup failed! ";}
If (! @ Fclose ($ fp) {$ re = false; echo "an error occurred while closing the file. backup failed! ";}
Return $ re;
}

/**
* Generate an SQL file
* @ Param string $ SQL statement
* @ Param number $ subsection volume size, in kb, 0 indicates no volume sharding
*/
Public function export_ SQL ($ table, $ subsection = 0 ){
If (! $ This-> check_write_dir ($ this-> data_dir) {echo 'You do not have permission to operate the Directory, backup failed '; return false ;}
If ($ subsection = 0 ){
If (! Is_array ($ table )){
$ This-> set_ SQL ($ table, 0, $ this-> transfer );
} Else {
For ($ I = 0; $ I $ This-> set_ SQL ($ table [$ I], 0, $ this-> transfer );
}
}
$ Filename = $ this-> data_dir.date ("ymd", time (). '_ all. SQL ';
If (! $ This-> write_ SQL ($ filename, $ this-> transfer) {return false ;}
} Else {
If (! Is_array ($ table )){
$ Sqlarry = $ this-> set_ SQL ($ table, $ subsection, $ this-> transfer );
$ Sqlarry [] = $ this-> transfer;
} Else {
$ Sqlarry = array ();
For ($ I = 0; $ I $ Tmparry = $ this-> set_ SQL ($ table [$ I], $ subsection, $ this-> transfer );
$ Sqlarry = array_merge ($ sqlarry, $ tmparry );
}
$ Sqlarry [] = $ this-> transfer;
}
For ($ I = 0; $ I $ Filename = $ this-> data_dir.date ("ymd", time (). '_ part'. $ I.'. SQL ';
If (! $ This-> write_ SQL ($ filename, $ sqlarry [$ I]) {return false ;}
}
}
Return true;
}
/**
* Load an SQL file
* @ Param diretory $ dir
* @ Return booln
* Note: Do not store other files in the directory or directory.
* To save recovery time
*/
Public function import_ SQL ($ dir ){
If ($ link = opendir ($ dir )){
$ Filearry = scandir ($ dir );
$ Pattern = "_ part [0-9] +. SQL $ | _ all. SQL $ ";
For ($ I = 0; $ I If (eregi ($ pattern, $ filearry [$ I]) {
$ Sqls = file ($ dir. $ filearry [$ I]);
Foreach ($ sqls as $ SQL ){
Str_replace ("r", "", $ SQL );
Str_replace ("n", "", $ SQL );
If (! Mysql_query (trim ($ SQL) return false;
}
}
}
Return true;
}
}

}

Application method

// $ D = new data ();

// Connect to the database
// If (! $ D-> connect_db ('localhost', 'root', '', 'guestbook', 'gbk ')){
// Echo 'database connection failed ';
//}

// Search for all data tables in the database
// $ Tablearry = $ d-> get_db_table ('guestbook ');

// Back up and generate an SQL file
// If (! $ D-> export_ SQL ($ tablearry )){
// Echo 'backup failed ';
//} Else {
// Echo 'backup successful ';
//}

// Restore the imported SQL folder
// If ($ d-> import_ SQL ($ d-> data_dir )){
// Echo 'recovery successful ';
//} Else {
// Echo 'recovery failed ';
//}

SNAPSHOT * and storage backup location. * The class is real-listed and connected to the database...