MYSQL data access method, php4 supports the process access method starting with mysql_, php5 starts to support the process starting with mysqli_ and mysqli object-oriented
Access method, this encapsulation class is encapsulated by mysql_
General process of data access:
1, connect to the database mysql_connect or mysql_pconnect
2, select database mysql_select_db
3, execute SQL query mysql_query
4, process the returned data mysql_fetch_array mysql_num_rows mysql_fetch_assoc mysql_fetch_row etc
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