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http://www.oracle.com/technology/documentation/berkeley-db/db/programmer_reference/ext_php.html
class Db4µÄÉùÃ÷ÈçÏ£º
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) {}
}

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function open($txn = null, $file = null, $database = null, $type = DB_BTREE, $flags = DB_CREATE, $mode = 0)

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REGISTER_LONG_CONSTANT("DB_BTREE", DB_BTREE, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("DB_HASH", DB_HASH, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("DB_RECNO", DB_RECNO, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("DB_QUEUE", DB_QUEUE, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("DB_UNKNOWN", DB_UNKNOWN, CONST_CS | CONST_PERSISTENT);

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