DBI-1.634之selectrow_array与fetchrow_array的区别

　　在DBI-1.634使用手册里有一个selectrow_array函数，该函数具体说明如下：

　　This utility method combines "prepare", "execute" and "fetchrow_array" into a single call. If called in a list context, it returns the first row of data from the statement. The $statement parameter can be a previously prepared statement handle, in which case the prepare is skipped.

　　手册里说明该函数具备与fetchrow_array类似的功能。在实际使用时，确实有区别的。如下例子：

 1 #!/bin/env perl
 2 use DBI;
 3 
 4 my $dbh=DBI->connect("dbi:Oracle:gzgldb","nrmdb","nrmoptr123") or die "connect db error!";
 5 
 6 my $sql='select * from router';
 7 
 8 my $sth=$dbh->prepare($sql);
 9 
10 $sth->execute() or die "execute sql error!";
11 
12 my @row1=$sth->fetchrow_array();
13 print "@row1 \n";
14 @row1=$sth->fetchrow_array();
15 print "@row1 num2 \n";
16 
17 my @row=$dbh->selectrow_array($sql);
18       print "@row\n";
19 
20 @row=$dbh->selectrow_array($sql);
21 
22       print "@row\n";
23 
24 
25 $sth->finish;
26 $dbh->disconnect();

以下为输出结果：

DBI-1.634之selectrow_array与fetchrow_array的区别

由此可以看出fetchrow_array每取一次，行指针会下移一次；而selectrow_array确不会这样做。