(PHP 4, PHP 5, PHP 7)
pg_connect — 打开一个 PostgreSQL 连接
$connection_string
)pg_connect() 返回其它 PostgreSQL 函数所需要的资源。
pg_connect() 打开一个由
connection_string
所指定的
PostgreSQL 数据库的连接。如果成功则返回连接资源,如果不能连接则返回
FALSE
。connection_string
应该是用引号引起来的字符串。
Example #1 使用 pg_connect()
<?php
$dbconn = pg_connect("dbname=mary");
//connect to a database named "mary"
$dbconn2 = pg_connect("host=localhost port=5432 dbname=mary");
// connect to a database named "mary" on "localhost" at port "5432"
$dbconn3 = pg_connect("host=sheep port=5432 dbname=mary user=lamb password=foo");
//connect to a database named "mary" on the host "sheep" with a username and password
$conn_string = "host=sheep port=5432 dbname=test user=lamb password=bar";
$dbconn4 = pg_connect($conn_string);
//connect to a database named "test" on the host "sheep" with a username and password
?>
connection_string
所包括的参数有
host
,port
,tty
, options
,dbname
, user
和 password
。
如果用同样的 connection_string
再次调用
pg_connect(),不会建立新连接,而是返回前面已经打开的连接资源。如果使用不同的连接字符串,则可以和同一个数据库建立多个连接。
旧的多参数语法 $conn = pg_connect("host", "port", "options", "tty", "dbname") 已经不提倡使用。
参见 pg_pconnect(),pg_close(),pg_host(),pg_port(), pg_tty(),pg_options() 和 pg_dbname()。