sqlite怎样迁移到mysql脚本

发布时间：2022-02-18 12:23:21 所属栏目：编程来源：互联网

导读：这篇文章主要介绍了sqlite如何迁移到mysql脚本，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。具体代码如下所示： #! /usr/bin/perl # # based on https://stackoverflow.com/a/87531/

这篇文章主要介绍了sqlite如何迁移到mysql脚本，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

具体代码如下所示：

#! /usr/bin/perl
#
# based on https://stackoverflow.com/a/87531/5742651
# usage: sqlite3 .dump database_name.sqlite3 | perl sqlite2mysql.pl | mysql -u root -p $import_database_name
#
# ignore follow lines:
# BEGIN TRANSACTION
# COMMIT
# sqlite_sequence
# CREATE UNIQUE INDEX
# PRAGMA foreign_keys=OFF
# "tablename/field" => `tablename/field`
# booleans 't' and 'f' => 1 and 0
# AUTOINCREMENT => AUTO_INCREMENT
# varchar => varchar(255)
# CREATE TABLE table... => DROP TABLE table; CREATE TABLE table...
# Merge insert sqls into multiple insert to speed up
# INSERT INTO table VALUES('val1');
# INSERT INTO table VALUES('val2'); => INSERT INTO table VALUES('val1'), ('val2'), ('val3');
# INSERT INTO table VALUES('val3');
my $open=0;
my $line_cache = '';
# For speed up
print "SET GLOBAL max_allowed_packet=209715200;n";
#print "SET AUTOCOMMIT=0;n";
while ($line = <>){
  if (($line !~ /PRAGMA foreign_keys=OFF/) && ($line !~ /BEGIN TRANSACTION/) && ($line !~ /COMMIT/) && ($line !~ /sqlite_sequence/) && ($line !~ /CREATE UNIQUE INDEX/)){
   if ($line =~ /CREATE TABLE "([a-z_0-9]*)"(.*)/){
   $name = "`$1`";
   $sub = $2;
   $sub =~ s/varchar([^(])/varchar(255)$1/g;
   $line = "DROP TABLE IF EXISTS $name;nCREATE TABLE $name$subn";
   }
   elsif ($line =~ /CREATE VIEW ([a-z_0-9]*)(.*)/){
   $name = "`$1`";
   $sub = $2;
   $line = "DROP VIEW IF EXISTS $name;nCREATE VIEW $name$subn";
   }
   elsif ($line =~ /INSERT INTO "([a-z_]*)" VALUES(.*);/){
        if ($open == 0) {
          $open = 1;
       $line_cache .= "INSERT INTO `$1` VALUES $2";
        } else {
          $line_cache .= ", $2";
        }
        next;
   }else{
   $line =~ s/''/'/g;
   }
    if ($open == 1) {
       $open = 0;
       $line = $line_cache.";n".$line;
       $line_cache = '';
    }
   $line =~ s/"/`/g;
   $line =~ s/([^'])'t'(.)/$1THIS_IS_TRUE$2/g;
   $line =~ s/THIS_IS_TRUE/1/g;
   $line =~ s/([^'])'f'(.)/$1THIS_IS_FALSE$2/g;
   $line =~ s/THIS_IS_FALSE/0/g;
   $line =~ s/AUTOINCREMENT/AUTO_INCREMENT/g;
   print $line;
  }
}
#print "SET AUTOCOMMIT=1;n";
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