Php calls mysql data dbclass _ PHP Tutorial

Php calls the dbclass class of mysql data. Copy the code as follows: classdbClass {start database Class var $ username; var $ password; var $ database; var $ hostname; var $ link; var $ result; functiondbClass ($ username, $ passw The code is as follows:

Class dbClass {// start Database class
Var $ username;
Var $ password;
Var $ database;
Var $ hostname;
Var $ link;
Var $ result;

Function dbClass ($ username, $ password, $ database, $ hostname = "localhost "){
$ This-> username = $ username;
$ This-> password = $ password;
$ This-> database = $ database;
$ This-> hostname = $ hostname;
}

Function connect () {// This function is used to connect to the database
If (! $ This-> link = mysql_connect ($ this-> hostname, $ this-> username, $ this-> password ))
$ This-> halt ("Sorry, can not connect to database ");

If ($ this-> version ()> '4. 1 '){
Global $ dbcharset, $ charset;
If (! $ Dbcharset & in_array (strtolower ($ charset), array ('gbk', 'big5', 'utf-8 '))){
$ Dbcharset = str_replace ('-', '', $ charset );
}
If ($ dbcharset ){
Mysql_query ("SET character_set_connection = $ dbcharset, character_set_results = $ dbcharset, character_set_client = binary ");
}
}
If ($ this-> version ()> '5. 0.1 '){
Mysql_query ("SET SQL _mode = ''");
}

Return $ this-> link;
}

Function select () {// This function is used to select a database
Mysql_select_db ($ this-> database, $ this-> link );
}

Function query ($ SQL) {// This function is commonly used to send query statements and return results.
If ($ this-> result = mysql_query ($ SQL, $ this-> link) return $ this-> result;
Else {
$ This-> halt ("SQL statement error: $ SQL

Error message: ". mysql_error ());
Return false;
}
}

/*
The following functions are used to retrieve an array from the result. they are generally used with the while () loop and $ db-> query ($ SQL) functions, for example:
$ Result = query ("select * from mytable ");
While ($ row = $ db-> getarray ($ result )){
Echo "$ row [id]";
}
*/
Function getarray ($ result ){
Return @ mysql_fetch_array ($ result );
}

/*
The following function is used to obtain the first row of an SQL query. it is generally used to query whether a qualified row exists. for example:
The username $ username and password $ password submitted by the user from the form are in the user table "user", and the corresponding array is returned:
If ($ user = $ db-> getfirst ("select * from user where username = '$ username' and password =' $ password '"))
Echo "welcome $ username. your ID is $ user [id]. ";
Else
Echo "incorrect user name or password! ";
*/
Function getfirst ($ SQL ){
Return @ mysql_fetch_array ($ this-> query ($ SQL ));
}

/*
The following function returns the total number of rows that meet the query conditions, for example, used for paging calculation. for example:
$ Totlerows = $ db-> getcount ("select * from mytable ");
Echo "a total of $ totlerows information. ";
*/
Function getcount ($ SQL ){
Return @ mysql_num_rows ($ this-> query ($ SQL ));
}

/*
Use the following functions to update a database, such as changing the password:
$ Db-> update ("update user set password = '$ new_password' where userid = '$ userid '");
*/
Function update ($ SQL ){
Return $ this-> query ($ SQL );
}

/*
The following function is used to insert a row to a database, for example, adding a user:
$ Db-> insert ("insert into user (userid, username, password) values (null, '$ username',' $ password ')");
*/
Function insert ($ SQL ){
Return $ this-> query ($ SQL );
}

Function getid () {// This function is used to obtain the id of the inserted row.
Return mysql_insert_id ();
}

Function num_rows ($ query ){
$ Query = mysql_num_rows ($ query );
Return $ query;
}

Function num_fields ($ query ){
Return mysql_num_fields ($ query );
}

Function free_result ($ query ){
Return mysql_free_result ($ query );
}

Function version (){
Return mysql_get_server_info ();
}

Function close (){
Return mysql_close ();
}

Function halt ($ message = ''){
Return $ message;
}
}

$ Db = new dbClass ("$ db_username", "$ db_password", "$ db_database", "$ db_hostname ");
$ Db-> connect ();
$ Db-> select ();

The http://www.bkjia.com/PHPjc/323376.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/323376.htmlTechArticle code is as follows: class dbClass {// start database class var $ username; var $ password; var $ database; var $ hostname; var $ link; var $ result; function dbClass ($ username, $ passw...