Php face-to-face object database operation class instance, php instance _ PHP Tutorial

Php instance and php instance. Php face image object database operation class instance. php instance this article describes the php face image object database operation class. Share it with you for your reference. The specific implementation code is as follows: Copy the code php interface to an object database operation instance, and a php instance

This example describes how to operate php-like object databases. Share it with you for your reference.

The specific implementation code is as follows:

The code is as follows:

// Construct a database operation class to encapsulate all database operations.
// It can be expanded to facilitate the use of background management programs
Class MySQLDB
{
Var $ host;
Var $ user;
Var $ passwd;
Var $ database;
Var $ conn;

// Use constructors to initialize variables
// Connect to the database at the same time
Function MySQLDB ($ host, $ user, $ password, $ database)
{
$ This-> host = $ host;
$ This-> user = $ user;
$ This-> passwd = $ password;
$ This-> database = $ database;
$ This-> conn = mysql_connect ($ this-> host, $ this-> user, $ this-> passwd) or
Die ("cocould not connect to $ this-> host ");
Mysql_select_db ($ this-> database, $ this-> conn) or
Die ("cocould not switch to database $ this-> database ");
}

// This function is used to close the database connection.
Function Close ()
{
MySQL_close ($ this-> conn );
}

// This function allows you to query databases.
Function Query ($ queryStr)
{
$ Res = Mysql_query ($ queryStr, $ this-> conn) or
Die ("cocould not query database ");
Return $ res;
}

// This function returns the record set
Function getRows ($ res)
{
$ Rowno = 0;
$ Rowno = MySQL_num_rows ($ res );
If ($ rowno> 0)
{
For ($ row = 0; $ row <$ rowno; $ row ++)
{
$ Rows [$ row] = MySQL_fetch_array ($ res );
// It is originally MySQL_fetch_row, but cannot be extracted as an array. it can only be indexed.
// This makes it easier to use indexes and names.
}
Return $ rows;
}
}

// Number of database records retrieved by this function
Function getRowsNum ($ res)
{
$ Rowno = 0;
$ Rowno = mysql_num_rows ($ res );
Return $ rowno;
}

// The number of fields returned by this function in the database table
Function getFieldsNum ($ res)
{
$ Fieldno = 0;
$ Fieldno = mysql_num_fields ($ res );
Return $ fieldno;
}

// This function returns the database table field name set.
Function getFields ($ res)
{
$ Fno = $ this-> getFieldsNum ($ res );
If ($ fno> 0)
{
For ($ I = 0; $ I <$ fno; $ I ++)
{
$ Fs [$ I] = MySQL_field_name ($ res, $ I); // Obtain the name of the I field
}
Return $ fs;
}
}
}

// Directly require the file during use and then instantiate it:

$ SqlDB = new MySQLDB ("localhost", "root", "root", "testdb ");

$ SQL = "select * from tableX ...";

$ Result = $ SqlDB-> Query ($ SQL); // Query

$ Rs = $ SqlDB-> getRows ($ result); // Obtain the record set

$ Num = $ SqlDB-> getRowsNum ($ result); // Obtain the number of records

... The remaining operation is the cyclic value,

For ($ I = 0; $ I <$ num; $ I ++ ){
Echo ($ rs [$ I] ["field name"]);
}

...

Do not forget to close the data link.

The code is as follows:

$ SqlDB-> Close ();

Of course this sentence can be avoided. php will automatically log out! But it is better to develop a good habit! And so on.

I hope this article will help you with PHP programming.

The example in this article describes how to operate php-like object databases. Share it with you for your reference. The specific implementation code is as follows :...