postgresql数据库-PostgreSQL连接PHP

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安装

PostgreSQL的扩展是默认启用的最新版本的PHP5.3.x.但是它可能通过在编译时加上–without-pgsql 选项禁用。但仍然可以使用yum命令安装PHP的PostgreSQL的接口:

 yum install php-pgsql

在开始使用PHP PostgreSQL接口,打开pg_hba.conf文件(在PostgreSQL安装目录),并添加下面一行:

 # IPv4 local connections: host    all         all         127.0.0.1/32          md5 

使用start/restart启动Postgres服务器,它没有运行使用下面的命令:

 [root@host]# service postgresql restart Stopping postgresql service:                               [  OK  ] Starting postgresql service:                               [  OK  ]

Windows用户必须启用php_pgsql.dll为了使用这个扩展。这个DLL包含带Windows分布在最新版本PHP5.3.x

有关详细的安装说明,请查看我们的PHP教程和其官方网站上。

PHP 接口APIs

以下是重要的PHP程序,可以连接使用PostgreSQL数据库PHP程序。如果正在寻找一个更复杂的应用程序,那么可以看看到PHP官方文件。

S.N. API & 描述
1 resource pg_connect ( string $connection_string [, int $connect_type ] )

这将打开一个连接到PostgreSQL数据库由connection_string指定。

如果PGSQL_CONNECT_FORCE_NEW会传递为connect_type,然后在第二个调用的情况下,对pg_connect()创建一个新的连接,即使connection_string一个现有的连接是相同的。

2 bool pg_connection_reset ( resource $connection )

此例程重置连接。它是有用的错误恢复。成功返回TRUE或失败则返回FALSE。

3 int pg_connection_status ( resource $connection )

这个例程返回指定的连接状态。返回PGSQL_CONNECTION_OK或PGSQL_CONNECTION_BAD。

4 string pg_dbname ([ resource $connection ] )

这个例程返回给定的PostgreSQL数据库连接资源的名称。

5 resource pg_prepare ([ resource $connection ], string $stmtname , string $query )

提交请求以创建具有给定参数的准备好的语句,并等待完成。

6 resource pg_execute ([ resource $connection ], string $stmtname , array $params )

这个程序发送一个请求给定的参数执行准备好的语句,并等待结果。

7 resource pg_query ([ resource $connection ], string $query )

此程序执行查询指定的数据库连接。

8 array pg_fetch_row ( resource $result [, int $row ] )

该例程将指定的结果的资源相关联的,数据从结果中获取一个行。

9 array pg_fetch_all ( resource $result )

这个例程返回一个数组,包含所有行(记录),结果资源。

10 int pg_affected_rows ( resource $result )

这个例程返回INSERT,UPDATE和DELETE查询受到影响的行数。

11 int pg_num_rows ( resource $result )

这个例程返回的行数,例如SELECT语句返回的行数在一个PostgreSQL结果资源。

12 bool pg_close ([ resource $connection ] )

该例程关闭非持久连接到一个给定的连接资源相关的PostgreSQL数据库。

13 string pg_last_error ([ resource $connection ] )

这个例程返回的最后一个错误消息,对于一个给定的连接。

14 string pg_escape_literal ([ resource $connection ], string $data )

此例程转义文字插入一个文本字段。

15 string pg_escape_string ([ resource $connection ], string $data )

这例程转义一个字符串查询数据库。

连接到数据库

下面的PHP代码显示了如何连接到一个现有的在本地机器上的数据库,最后将返回一个数据库连接对象。

 <?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来打开数据库testdb,如果成功打开数据库,然后它会给下面的消息:

 Opened database successfully 

创建表

下面的PHP程序将使用以前创建的数据库中创建一个表:

 <?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 =<<<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($db);    } else {       echo "Table created successfully ";    }    pg_close($db); ?>

上述程序执行时,它会创建表COMPANY在数据库testdb 中 ,它会显示以下消息: 

 Opened database successfully Table created successfully 

INSERT操作

PHP程序,显示我们如何创建表COMPANY 在上面的例子中,创建表中的记录:

 <?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 =<<<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($db);    } else {       echo "Records created successfully ";    }    pg_close($db); ?>

上述程序执行时,它会创建COMPANY表中的记录,并会显示以下两行:

 Opened database successfully Records created successfully 

SELECT 操作

PHP程序表明我们如何获取并显示COMPANY 在上面的例子中创建表的记录:

 <?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 =<<<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] . " ";       echo "NAME = ". $row[1] ." ";       echo "ADDRESS = ". $row[2] ." ";       echo "SALARY =  ".$row[4] ."  ";    }    echo "Operation done successfully ";    pg_close($db); ?>

当上述程序执行时,它会产生以下结果。字段返回序列中,它们被用来创建表的同时保持注意。

 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 

UPDATE 操作

下面的PHP代码显示了如何我们可以使用UPDATE语句来更新任何记录,然后获取并显示更新的记录,从COMPANY 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 =<<<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 ";    }        $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] . " ";       echo "NAME = ". $row[1] ." ";       echo "ADDRESS = ". $row[2] ." ";       echo "SALARY =  ".$row[4] ."  ";    }    echo "Operation done successfully ";    pg_close($db); ?>

当上述程序执行时,它会产生以下结果:

 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 

DELETE 操作

下面的PHP代码,表明我们如何能够使用DELETE语句删除任何记录,然后获取并显示COMPANY 表剩余的记录:

 <?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 =<<<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 ";    }        $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] . " ";       echo "NAME = ". $row[1] ." ";       echo "ADDRESS = ". $row[2] ." ";       echo "SALARY =  ".$row[4] ."  ";    }    echo "Operation done successfully ";    pg_close($db); ?>

当上述程序执行时,它会产生以下结果:

 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

  

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