PHP连接及操作PostgreSQL数据库的方法详解
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 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
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\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
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希望本文所述对大家php程序设计有所帮助。
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