PHP connection MySQL data operation points, Phpmysql data points _php Tutorial

PHP connection MySQL Data operation Point, phpmysql data points

The MySQL extension library operates the MySQL database in the following steps:
1: Get the connection.
2: Choose the Library.
3: Set the action encoding.
4: Send SQL instructions (MySQL database can be divided into four kinds of instructions:

4.1:DDL: Data definition language.
4.2:DML: Data manipulation language (e.g. curd);
4.3:DQL: Data Query Language. (such as Select)
4.4:DTL: Data things language.

5: Receive the returned result and process.
6: Disconnect.

The specific sample code is as follows:
Copy the Code code as follows:
<?php
1: Connect to the database
$con =mysql_connect ("localhost", "root", "Toor");
Error if no connection is successful
if (! $con) {
echo "Connection Failed";
Exit ();
}
2: Select the database to manipulate
mysql_select_db ("test");
3: Send SQL command
mysql_query ("Set names UTF8");//Set query encoding
$sql = "Select *from test1";
$res =mysql_query ($sql, $con);
4: Return results (by row traversal)
while ($row =mysql_fetch_row ($res)) {
echo "$row [0]-------------$row [1]-----------$row [2]-----------$row [3]-----------$row [4]". '
';
}
5: Release the resource, close the connection
Mysql_free_result ($res);
Mysql_close ($con);
?>

To illustrate, all of the operations here are in the memory of the operation, can not be taken for granted is what things, so say, understand some of the underlying things still have certain benefits.

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