#! /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 $name$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";