Code前端首页关于Code前端联系我们
首页 数据库正文

PHP 连接到 PostgreSQL 数据库代码示例

terry 2年前 (2023-09-26) 阅读数 43 #数据库

最新版本的 PHP 5.3.x 默认启用 PostgreSQL 扩展。编译时可以使用--不用pgsql来禁用它。您仍然可以安装 yum 来安装 PHP-PostgreSQL 界面： 

yum install php-pgsql
Shell

在开始安装 PHP 以连接到 Post SQL 之前 PostgreSQL 查找在安装目录下创建文件 pg_hba.conf，添加以下行： 

# IPv4 local connections:
host    all         all         127.0.0.1/32          md5
Shell 您可以通过运行以下命令来启动 post/s： 
[root@host]# service postgresql restart
Stopping postgresql service:                               [  OK  ]
Starting postgresql service:                               [  OK  ]
Shell

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

PHP 连接 PostgreSQL 数据库

以下 PHP 代码展示了如何连接到本地机器上现有的数据库，并最终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\n";
   } else {
      echo "Opened database successfully\n";
   }
?>
PHP

现在运行上面的程序打开数据库：testdb，如果数据库连接打开成功，会给出如下信息：

Opened database successfully

Opened database successfully
表创建

您将使用以下PHP程序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\n";
   } else {
      echo "Opened database successfully\n";
   }

   $sql =<<<EOF
      CREATE TABLE COMPANY
      (ID INT PRIMARY KEY     NOT NULL,
      NAME           TEXT    NOT NULL,
      AGE            INT     NOT NULL,
      ADDRESS        CHAR(50),
      SALARY         REAL);
EOF;

   $ret = pg_query($db, $sql);
   if(!$ret){
      echo pg_last_error($db);
   } else {
      echo "Table created successfully\n";
   }
   pg_close($db);
?>
PHP

创建上述程序后，它将运行。 testdb 在数据库中创建表COMPANY，并显示以下消息： 

Opened database successfully
Table created successfully
SQL

插入操作显示如何创建以下 PHP 程序❝ 上例中的 COMPANY 表 创建一条记录： 
<?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\n";
   } else {
      echo "Opened database successfully\n";
   }

   $sql =<<<EOF
      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (1, 'Paul', 32, 'California', 20000.00 );

      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (2, 'Allen', 25, 'Texas', 15000.00 );

      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );

      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );
EOF;

   $ret = pg_query($db, $sql);
   if(!$ret){
      echo pg_last_error($db);
   } else {
      echo "Records created successfully\n";
   }
   pg_close($db);
?>
PHP

当执行上述程序时，它会在 COMPANY 表中创建给定记录，并显示以下两个表。行： 

Opened database successfully
Records created successfully
Shell

SELECT 操作

以下 PHP 程序显示如何从上例中创建的 COMPANY 表中检索和显示记录： 当

<?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\n";
   } else {
      echo "Opened database successfully\n";
   }

   $sql =<<<EOF
      SELECT * from COMPANY;
EOF;

   $ret = pg_query($db, $sql);
   if(!$ret){
      echo pg_last_error($db);
      exit;
   } 
   while($row = pg_fetch_row($ret)){
      echo "ID = ". $row[0] . "\n";
      echo "NAME = ". $row[1] ."\n";
      echo "ADDRESS = ". $row[2] ."\n";
      echo "SALARY =  ".$row[4] ."\n\n";
   }
   echo "Operation done successfully\n";
   pg_close($db);
?>
当以上程序运行时执行后，会产生以下结果。请记住按照创建表时使用的顺序返回字段。 

Opened database successfully
ID = 1
NAME = Paul
ADDRESS = California
SALARY =  20000

ID = 2
NAME = Allen
ADDRESS = Texas
SALARY =  15000

ID = 3
NAME = Teddy
ADDRESS = Norway
SALARY =  20000

ID = 4
NAME = Mark
ADDRESS = Rich-Mond
SALARY =  65000

Operation done successfully
Shell

更新操作

以下PHP代码展示了如何使用UPDATE语句来更新指定的记录，然后检索并显示 COMPANY 表中更新的记录： 

<?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\n";
   } else {
      echo "Opened database successfully\n";
   }
   $sql =<<<EOF
      UPDATE COMPANY set SALARY = 25000.00 where ID=1;
EOF;
   $ret = pg_query($db, $sql);
   if(!$ret){
      echo pg_last_error($db);
      exit;
   } else {
      echo "Record updated successfully\n";
   }

   $sql =<<<EOF
      SELECT * from COMPANY;
EOF;

   $ret = pg_query($db, $sql);
   if(!$ret){
      echo pg_last_error($db);
      exit;
   } 
   while($row = pg_fetch_row($ret)){
      echo "ID = ". $row[0] . "\n";
      echo "NAME = ". $row[1] ."\n";
      echo "ADDRESS = ". $row[2] ."\n";
      echo "SALARY =  ".$row[4] ."\n\n";
   }
   echo "Operation done successfully\n";
   pg_close($db);
?>
PHP

执行上述程序，得到以下结果： 

Opened database successfully
Record updated successfully
ID = 2
NAME = Allen
ADDRESS = 25
SALARY =  15000

ID = 3
NAME = Teddy
ADDRESS = 23
SALARY =  20000

ID = 4
NAME = Mark
ADDRESS = 25
SALARY =  65000

ID = 1
NAME = Paul
ADDRESS = 32
SALARY =  25000

Operation done successfully
Shell

以下 PHP 代码

删除操作

使用方法命令DELETE删除指定记录，然后获取并显示COMPANY表中剩余的记录： 
<?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\n";
   } else {
      echo "Opened database successfully\n";
   }
   $sql =<<<EOF
      DELETE from COMPANY where ID=2;
EOF;
   $ret = pg_query($db, $sql);
   if(!$ret){
      echo pg_last_error($db);
      exit;
   } else {
      echo "Record deleted successfully\n";
   }

   $sql =<<<EOF
      SELECT * from COMPANY;
EOF;

   $ret = pg_query($db, $sql);
   if(!$ret){
      echo pg_last_error($db);
      exit;
   } 
   while($row = pg_fetch_row($ret)){
      echo "ID = ". $row[0] . "\n";
      echo "NAME = ". $row[1] ."\n";
      echo "ADDRESS = ". $row[2] ."\n";
      echo "SALARY =  ".$row[4] ."\n\n";
   }
   echo "Operation done successfully\n";
   pg_close($db);
?>
PHP得到如下结果：
Opened database successfully
Record deleted successfully
ID = 3
NAME = Teddy
ADDRESS = 23
SALARY =  20000

ID = 4
NAME = Mark
ADDRESS = 25
SALARY =  65000

ID = 1
NAME = Paul
ADDRESS = 32
SALARY =  25000

Operation done successfully
贝壳

版权声明

本文仅代表作者观点，不代表Code前端网立场。
本文系作者Code前端网发表，如需转载，请注明页面地址。

上一篇：Perl 连接到 PostgreSQL 数据库实例代码 下一篇：Java程序中使用JDBC驱动连接PostgreSQL数据库
相关文章

发表评论:

◎欢迎参与讨论，请在这里发表您的看法、交流您的观点。

terry

terry

作者文章
浏览更多
热门
最新文章
标签列表
Copyright by code前端网 All Rights Reserved.粤ICP备12067512号-4

Powered By Z-BlogPHP Theme By 编程老白