How sqlite migrates to mysql scripts
This article mainly introduces how sqlite migrates to mysql script, which has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.
The specific code is as follows:
#! /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 $line_cache = '';# For speed upprint "SET GLOBAL max_allowed_packet=209715200;\n";#print "SET AUTOCOMMIT=0;\n";while ($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 $name$sub\n"; } elsif ($line =~ /CREATE VIEW ([a-z_0-9]*)(.*)/) { $name = "\`$1\`"; $sub = $2; $line = "DROP VIEW IF EXISTS $name;\nCREATE VIEW $name$sub\n"; } 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"; Thank you for reading this article carefully. I hope that the article "SQLite how to migrate to mysql script" shared by Xiaobian will be helpful to everyone. At the same time, I hope that everyone will support it a lot. Pay attention to the industry information channel. More relevant knowledge is waiting for you to learn!
