发布于 2015-07-12 03:12:04 | 312 次阅读 | 评论: 0 | 来源: 网络整理
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。
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。 |
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 databasen";
} else {
echo "Opened database successfullyn";
}
?>
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
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 databasen";
} else {
echo "Opened database successfullyn";
}
$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($db);
} else {
echo "Table created successfullyn";
}
pg_close($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
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 databasen";
} else {
echo "Opened database successfullyn";
}
$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($db);
} else {
echo "Records created successfullyn";
}
pg_close($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
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 databasen";
} else {
echo "Opened database successfullyn";
}
$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] ."nn";
}
echo "Operation done successfullyn";
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
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 databasen";
} else {
echo "Opened database successfullyn";
}
$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 successfullyn";
}
$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] ."nn";
}
echo "Operation done successfullyn";
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
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 databasen";
} else {
echo "Opened database successfullyn";
}
$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 successfullyn";
}
$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] ."nn";
}
echo "Operation done successfullyn";
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