Perl DBI - 使用多条语句运行 SQL 脚本

Question

我有一个 sql 文件 test.sql 用于运行一些看起来像这样的 SQL(创建对象/更新/删除/插入)

    CREATE TABLE test_dbi1 (
    test_dbi_intr_no    NUMBER(15)
  , test_dbi_name       VARCHAR2(100);

UPDATE mytable 
SET col1=1;

    CREATE TABLE test_dbi2 (
    test_dbi_intr_no    NUMBER(15)
  , test_dbi_name       VARCHAR2(100);

通常，我只会使用 SQLPLUS(从 Perl 中)使用以下命令执行此 test.sql:
@test.sql

有没有办法做同样的事情，在 Perl 中使用 DBI？
到目前为止，我发现 DBI 一次只能执行一条语句，而且没有“;”在末尾。

Answer 1

数据库控制一次可以执行多少条语句。我不记得 Oracle 是否允许每个 prepare 有多个语句与否(MySQL 确实如此)。尝试这个:

my $dbh = DBI->connect(
    "dbi:Oracle:dbname",
    "username",
    "password",
    {
        ChopBlanks       => 1,
        AutoCommit       => 1,
        RaiseError       => 1,
        PrintError       => 1,
        FetchHashKeyName => 'NAME_lc',
    }
);
$dbh->do("
    CREATE TABLE test_dbi1 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );

    UPDATE mytable 
        SET col1=1;

    CREATE TABLE test_dbi2 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );
");

$dbh->disconnect;

当然，如果将语句分解，您将获得更好的错误处理。您可以使用简单的解析器将字符串分解为单独的语句:

#!/usr/bin/perl

use strict;
use warnings;

my $sql = "
    CREATE TABLE test_dbi1 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );

    UPDATE mytable
        SET col1=';yes;'
        WHERE col2=1;

    UPDATE mytable
        SET col1='Don\\'t use ;s and \\'s together, it is a pain'
        WHERE col2=1;


    CREATE TABLE test_dbi2 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );
";

my @statements = ("");
#split the string into interesting pieces (i.e. tokens):
#   ' delimits strings
#   \ pass on the next character if inside a string
#   ; delimits statements unless it is in a string
#   and anything else
# NOTE: the grep { ord } is to get rid of the nul
# characters the split seems to be adding
my @tokens     = grep { ord } split /([\\';])/, $sql; 
# NOTE: this ' fixes the stupid SO syntax highlighter
#this is true if we are in a string and should ignore ; 
my $in_string  = 0;
my $escape     = 0;
#while there are still tokens to process
while (@tokens) {
    #grab the next token
    my $token = shift @tokens;
    #if we are in a string
    if ($in_string) {
        #add the token to the last statement
        $statements[-1] .= $token;
        #setup the escape if the token is \
        if ($token eq "\\") {
                $escape = 1;
                next;
        }
        #turn off $in_string if the token is ' and it isn't escaped
        $in_string = 0 if not $escape and $token eq "'";
        $escape = 0; #turn off escape if it was on
        #loop again to get the next token

        next;
    }
    #if the token is ; and we aren't in a string
    if ($token eq ';') {
        #create a new statement
        push @statements, "";
        #loop again to get the next token
        next;
    }
    #add the token to the last statement
    $statements[-1] .= $token;
    #if the token is ' then turn on $in_string
    $in_string = 1 if $token eq "'";
}
#only keep statements that are not blank
@statements = grep { /\S/ } @statements;

for my $i (0 .. $#statements) {
    print "statement $i:\n$statements[$i]\n\n";
}