postgresql数据库-PHP连接PostgreSQL数据库

跨零代码为大家提供高品质的解决方案,请大家多多来访,跨零不胜感激,在此谢过。

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 restart Stopping 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/n";    } else {       echo "Opened database successfully/n";    } ?> 

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/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); ?> 

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 successfully Table created successfully 

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/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); ?> 

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 successfully Records 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/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 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 

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/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); ?> 

执行上述程序时,会产生以下结果:

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 

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/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); ?> 

执行上述程序时,会产生以下结果:

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 

  

上一篇: Java连接PostgreSQL数据库 下一篇: Perl连接PostgreSQL数据库

加QQ群啦,易百教程官方技术学习群

从零到一,创造未来!跨零综合IT问题解决服务站,欢迎你的到来。Oracle数据库教程 postgresql数据库/a> 只为你绽放。

本文固定链接: http://kua0.com/2019/11/12/postgresql数据库-php连接postgresql数据库/

为您推荐

发表评论

电子邮件地址不会被公开。 必填项已用*标注