Make me cry make me smile PHP get started learning knowledge points PHP and MySQL connection and query

Source: Internet
Author: User
Tags php and mysql
First, connect the database
1. Mysql_connect: Open MySQL Link
Mysql_connect (' host ', ' username ', ' password ')
2. mysql_select_db: Open a Database
mysql_select_db (' database name ', $ link identifier)//link identifier not filled by default is the last open connection
3, mysql_query ("Set names ' GBK '") to solve the problem of Chinese garbled;
mysql_query ("Set Names ' code (UTF8 or GBK) '")//utf8 cannot have "-"
Second, query data
1, mysql_query (SQL statement, connection identifier);
$sql = "SELECT * FROM Test"
$result =mysql_query ($sql)//Connection identification defaults think last opened link
Get error message
$result = @mysql_query ($sql) or Die (Mysql_error ())
2, get the results of the query
A, mysql_fetch_row ($result);
$row =mysql_fetch_row ($result);
echo $row [0];
B, Mysql_fetch_array ($result);
$row =mysql_fetch_array ($result);
echo $row [0];
echo $row [' key '];
Description: The Mysql_fetch_array and mysql_fetch_row functions are basically the same, except that it can be indexed with a domain name in addition to the 0-based offset.
The value returns all the field values for the next row, saves them in an array, and returns False when there are no rows.

The above describes make me cry make me smile PHP get started learning knowledge points a PHP and MySQL connection and query, including made me cry do me smile aspects, I hope to be interested in PHP tutorial friends helpful.

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