本文实例讲述了PHP连接及操作PostgreSQL数据库的方法。分享给大家供大家参考，具体如下：

PostgreSQL扩展在默认情况下在最新版本的PHP 5.3.x中是启用的。 可以在编译时使用--without-pgsql来禁用它。仍然可以使用yum命令来安装PHP-PostgreSQL接口：yum install php-pgsql

在开始使用PHP连接PostgreSQL接口之前，请先在PostgreSQL安装目录中找到pg_hba.conf文件，并添加以下行：# IPv4 local connections:host all all 127.0.0.1/32 md5

您可以启动/重新启动postgres服务器，使用以下命令运行：[root@host]# service postgresql restartStopping postgresql service: [ OK ]Starting postgresql service: [ OK ]

Windows用户必须启用php_pgsql.dll才能使用此扩展名。这个DLL包含在最新版本的PHP 5.3.x中的Windows发行版中。

PHP连接到PostgreSQL数据库

以下PHP代码显示如何连接到本地机器上的现有数据库，最后将返回数据库连接对象。<?php $host = "host=127.0.0.1"; $port = "port=5432"; $dbname = "dbname=testdb"; $credentials = "user=postgres password=pass123"; $db = pg_connect( "$host $port $dbname $credentials" ); if(!$db){ echo "Error : Unable to open database"; } else { echo "Opened database successfully"; }?>

现在，让我们运行上面的程序打开数据库:testdb，如果成功打开数据库连接，那么它将给出以下消息：Opened database successfully

创建表

以下PHP程序将用于在之前创建的数据库(testdb)中创建一个表：<?php $host = "host=127.0.0.1"; $port = "port=5432"; $dbname = "dbname=testdb"; $credentials = "user=postgres password=pass123"; $db = pg_connect( "$host $port $dbname $credentials" ); if(!$db){ echo "Error : Unable to open database"; } else { echo "Opened database successfully"; } $sql =<<

当执行上述程序时，它将在testdb数据库中创建COMPANY表，并显示以下消息：Opened database successfullyTable created successfully

SQL

插入操作

以下PHP程序显示了如何在上述示例中创建的COMPANY表中创建记录：<?php $host = "host=127.0.0.1"; $port = "port=5432"; $dbname = "dbname=testdb"; $credentials = "user=postgres password=pass123"; $db = pg_connect( "$host $port $dbname $credentials" ); if(!$db){ echo "Error : Unable to open database"; } else { echo "Opened database successfully"; } $sql =<<

当执行上述程序时，它将在COMPANY表中创建给定的记录，并显示以下两行：Opened database successfullyRecords created successfully

SELECT操作

以下PHP程序显示了如何从上述示例中创建的COMPANY表中获取和显示记录：<?php $host = "host=127.0.0.1"; $port = "port=5432"; $dbname = "dbname=testdb"; $credentials = "user=postgres password=pass123"; $db = pg_connect( "$host $port $dbname $credentials" ); if(!$db){ echo "Error : Unable to open database"; } else { echo "Opened database successfully"; } $sql =<<

当执行上述程序时，将产生以下结果。 请记下，在创建表时按照它们使用的顺序返回字段。Opened database successfullyID = 1NAME = PaulADDRESS = CaliforniaSALARY =  20000ID = 2NAME = AllenADDRESS = TexasSALARY =  15000ID = 3NAME = TeddyADDRESS = NorwaySALARY =  20000ID = 4NAME = MarkADDRESS = Rich-MondSALARY =  65000Operation done successfully

更新操作

以下PHP代码显示了如何使用UPDATE语句来更新指定记录，然后从COMPANY表中获取并显示更新的记录：<?php $host = "host=127.0.0.1"; $port = "port=5432"; $dbname = "dbname=testdb"; $credentials = "user=postgres password=pass123"; $db = pg_connect( "$host $port $dbname $credentials" ); if(!$db){ echo "Error : Unable to open database"; } else { echo "Opened database successfully"; } $sql =<<

执行上述程序时，会产生以下结果：Opened database successfullyRecord updated successfullyID = 2NAME = AllenADDRESS = 25SALARY =  15000ID = 3NAME = TeddyADDRESS = 23SALARY =  20000ID = 4NAME = MarkADDRESS = 25SALARY =  65000ID = 1NAME = PaulADDRESS = 32SALARY =  25000Operation done successfully

删除操作

以下PHP代码显示了如何使用DELETE语句删除指定记录，然后从COMPANY表中获取并显示剩余的记录：<?php $host = "host=127.0.0.1"; $port = "port=5432"; $dbname = "dbname=testdb"; $credentials = "user=postgres password=pass123"; $db = pg_connect( "$host $port $dbname $credentials" ); if(!$db){ echo "Error : Unable to open database"; } else { echo "Opened database successfully"; } $sql =<<

执行上述程序时，会产生以下结果：Opened database successfullyRecord deleted successfullyID = 3NAME = TeddyADDRESS = 23SALARY =  20000ID = 4NAME = MarkADDRESS = 25SALARY =  65000ID = 1NAME = PaulADDRESS = 32SALARY =  25000Operation done successfully

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希望本文所述对大家PHP程序设计有所帮助。