Question

我已经尝试将PHP 5.3与dbase扩展一起使用，但对于超过2 GB的大型数据库，它无法可靠地工作。我需要一种方法来遍历大型DBF的子部分，并能够读取/编辑字段。可以这样做（我使用Windows）？

首次尝试：

table = dbf.Table('myhugeDBF.dbf') 
#is this the only way to access the dbf data? 
#I only need the last 10k records as opposed to the whole 4.5 GB beast


table.open()

for i in xrange(len(table)-10000, len(table)):
    table[i].desc = (table[i].desc).replace("\n","")
    print "*" + str(table[i].desc) + "*" #for debug purposes

Answer 1

table = dbf.Table('myhugeDBF.dbf') 
# is this the only way to access the dbf data?
# yes.  the above only reads the header, though, so you can get basic
# info about the dbf (size, field names, etc.)


table.open()
# this creates a data structure with one (small) element per record

for record in table[-10000:]:
    with record:
        record.desc = record.desc.replace('\n','')

迭代一个大型数据库

1 个答案: