bdb及其在php下扩展的安装

1、安装Berkeley DB

# cd /usr/local/src

# wget http://download.oracle.com/berkeley-db/db-4.6.21.tar.gz
# tar -zxvf db-4.6.21.tar.gz

# cd db-4.6.21

# cd build_unix

Berkeley DB默认是安装在/usr/local/BerkeleyDB.4.6目录下，其中4.6就是版本号，你也可以指定–prefix参数来设置安装目录

# ../dist/configure --prefix=/usr/local/berkeleydb --enable-cxx

其中–enable-cxx就是编译C++库，这样才能编译Berkeley DB数据库的PHP扩展php_db4

# make

# make install

# echo '/usr/local/berkeleydb/lib/' >> /etc/ld.so.conf

# ldconfig

这2句的作用就是通知系统Berkeley DB的动态链接库在/usr/local/berkeleydb/lib/目录。

如果没有系统提示ldconfig命令，则用whereis ldconfig找一下在哪，一般可用 # /sbin/ldconfig

至此，Berkeley DB数据库已经安装完成。

2、安装Berkeley DB的PHP扩展

虽然PHP里已经自带了php_db和php_dba两个扩展都支持Berkekey DB，但是毕竟支持的有限，所以还是编译Berkeley DB自带的php_db4扩展好。

# cd /usr/local/src/db-4.6.18/php_db4/

# phpize（/usr/local/php/bin/phpize）

# ./configure --with-db4=/usr/local/berkeleydb/ --with-php-config=/usr/local/php/bin/php-config

# make

# make install

说明：这里configure的时候可能会提示你找不到php-config，你可以找到你的php安装PATH，然后增加--with-php- config=PATH

至此db4已编译好在/usr/lib64/php/modules/db4.so目录(具体跟你的系统有关)

echo 'extension=db4.so' > /etc/php.d/db4.ini

重起WEB服务器(Apache等)

至此php_db4扩展的安装也完成了，执行php -m即可看到db4扩展已经加载了。

3、测试php_db4扩展php_db4提供了下面4个类：

class Db4Env {

function Db4Env($flags = 0) {}

function close($flags = 0) {}

function dbremove($txn, $filename, $database = null, $flags = 0) {}

function dbrename($txn, $file, $database, $new_database, $flags = 0) {}

function open($home, $flags = DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN, $mode = 0666) {}

function remove($home, $flags = 0) {}

function set_data_dir($directory) {}

function txn_begin($parent_txn = null, $flags = 0) {}

function txn_checkpoint($kbytes, $minutes, $flags = 0) {}

}

class Db4 {

function Db4($dbenv = null) {} // create a new Db4 object using the optional DbEnv

function open($txn = null, $file = null, $database = null, $flags = DB_CREATE, $mode = 0) {}

function close() {}

function del($key, $txn = null) {}

function get($key, $txn = null, $flags = 0) {}

function pget($key, &$pkey, $txn = null, $flags = 0) {}

function get_type() {} // returns the stringified database type name

function stat($txn = null, $flags = 0) {} // returns statistics as an as

function join($cursor_list, $flags = 0) {}

function sync() {}

function truncate($txn = null, $flags = 0) {}

function cursor($txn = null, flags = 0) {}

}

class Db4Txn {

function abort() {}

function commit() {}

function discard() {

function id() {}

function set_timeout($timeout, $flags = 0) {}

}

class Db4Cursor {

function close() {}

function count() {}

function del() {}

function dup($flags = 0) {}

function get($key, $flags = 0) {}

function pget($key, &$primary_key, $flags = 0) {}

function put($key, $data, $flags = 0) {}

}

从字面上也不难理解，Db4Env设置数据库环境、Db4操作数据库、Db4Txn用于事务处理、Db4Cursor用于光标处理。具体使用可参考
http://www.oracle.com/technology/documentation/berkeley-db/db/ref/ext/php.html
/usr/local/src/db-4.6.18/php_db4/samples目录下提供了2个简单的例子simple_counter.php和 transactional_counter.php。

simple_counter.php

// Create a new Db4 Instance

$db = new Db4();

// Open it outside a Db4Env environment with datafile/var/lib/db4

// and database name "test"

$db->open(null, "/var/tmp/db4", "test");

// Get the current value of "counter"

$counter = $db->get("counter");

print "Counter Value is $counter/n";

// Increment $counter and put() it.

$db->put("counter", $counter+1);

// Sync to be certain, since we're leaving the handle open

$db->sync();

?>

transactional_counter.php

// Open a new Db4Env

$dbenv = new Db4Env();

$dbenv->set_data_dir("/var/tmp/dbhome");

$dbenv->open("/var/tmp/dbhome");

// Open a database in $dbenv. Note that even though

// we pass null in as the transaction, db4 forces this

// operation to be transactionally protected, so PHP

// will force auto-commit internally.

$db = new Db4($dbenv);

$db->open(null, 'a', 'foo');

$counter = $db->get("counter");

// Create a new transaction

$txn = $dbenv->txn_begin();

if($txn == false) {

print "txn_begin failed";

exit;

}

print "Current value of counter is $counter/n";

// Increment and reset counter, protect it with $txn

$db->put("counter", $counter+1, $txn);

// Commit the transaction, otherwise the above put() will rollback.

$txn->commit();

// Sync for good measure

$db->sync();

// This isn't a real close, use _close() for that.

$db->close();

?>

需要补充的是

db4.so文件

cp modules/db4.so /usr/local/php5/ext/

这里需要你先设置你的php的扩展目录的在

在php.ini里面

通过设extension_dir

最后一不是你在php.ini文件中打开这个扩展

extension=jinzhesheng_module.so
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