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Squerl.pm
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Squerl.pm
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use SQLite3;
class Squerl::Dataset does Positional {
has $.db;
has %.opts;
# RAKUDO: Cannot type this attribute as Bool
has $.quote_identifiers is rw;
has Str $.identifier_input_method is rw;
has Str $.identifier_output_method is rw;
has &.row_proc is rw;
my $COMMA_SEPARATOR = ', ';
multi method new($db, :$quote_identifiers,
:$identifier_input_method, :$identifier_output_method,
:$row_proc,
*%opts) {
self.bless(self.CREATE(), :$db, :$quote_identifiers,
:$identifier_input_method,
:$identifier_output_method,
:$row_proc,
:%opts);
}
multi method clone(*%opts) {
my %new-opts = %!opts, %opts;
self.bless(self.CREATE(), :db($!db),
:quote_identifiers($!quote_identifiers),
:identifier_input_method(
$!identifier_input_method
),
:identifier_output_method(
$!identifier_output_method
),
:row_proc(&!row_proc),
:opts(%new-opts));
}
method from($value) {
self.clone(:from($value));
}
method filter($value) {
self.clone(:filter($value));
}
method insert(*@values) {
my $values = @values>>.perl.join(', ');
given $!db {
.open;
# RAKUDO: Real string interpolation
.exec("INSERT INTO {%!opts<table>} VALUES($values)");
.close;
}
}
method all() {
$!db.select("*", %!opts<table>);
}
method literal($value? is copy) {
$value //= %_.pairs[0];
given $value {
when Int { return literal_integer($value) }
when Num { return literal_number($value) }
when Str { return literal_string($value) }
when Pair { return self.literal_symbol($value.key) }
}
}
method literal_symbol($name is copy) {
$!identifier_input_method
= { 'upcase' => 'uc', 'downcase' => 'lc',
'reverse' => 'flip' }.{$!identifier_input_method}
// $!identifier_input_method;
if $!identifier_input_method {
# RAKUDO: Would like to have spaces around the operator:
# [perl #69204]
$name.="$!identifier_input_method";
}
$!quote_identifiers ?? quoted_identifier($name) !! $name;
}
submethod literal_array(@values) {
"({join $COMMA_SEPARATOR, map { self.literal($^value) }, @values})";
}
sub literal_integer($value) {
~$value
}
sub literal_number($value) {
~$value
}
sub literal_string($value) {
"'{$value.subst('\\', '\\\\', :g).subst("'", "''", :g)}'"
}
sub quoted_identifier($name) {
qq["{$name.subst(q["], q[""], :g)}"]
}
method output_identifier($name is copy) {
$!identifier_output_method
= { 'upcase' => 'uc', 'downcase' => 'lc',
'reverse' => 'flip' }.{$!identifier_output_method}
// $!identifier_output_method;
if $!identifier_output_method {
# RAKUDO: Would like to have spaces around the operator:
# [perl #69204]
$name.="$!identifier_output_method";
}
$name;
}
method static_sql($sql) {
$sql
}
method select_sql() {
return self.static_sql(%!opts<sql>)
if %!opts.exists('sql');
# RAKUDO: Real string interpolation
"SELECT * FROM {%!opts<from>}"
~ (%!opts.exists('filter')
?? " WHERE ({%!opts<filter>.fmt('%s = %s')})"
!! '');
}
method delete_sql() {
# RAKUDO: Real string interpolation
"DELETE FROM {%!opts<from>}";
}
method truncate_sql() {
# RAKUDO: Real string interpolation
"TRUNCATE TABLE {%!opts<from>}";
}
method insert_sql(*@positionals, *%nameds) {
my (@columns, @values);
for @positionals {
when Pair {
@columns.push(.key);
@values.push(.value);
}
when Num|Str|Squerl::Dataset {
@values.push($_);
}
when .^can('values') {
for .values.pairs {
die "Expected a Pair, got a {.WHAT}"
unless $_ ~~ Pair;
@columns.push(.key);
@values.push(.value);
}
}
}
for %nameds.pairs {
@columns.push(.key);
@values.push(.value);
}
my $columns = @columns ?? "({join $COMMA_SEPARATOR, @columns}) "
!! '';
my $values = @values
?? (@values[0] ~~ Squerl::Dataset
?? @values[0].select_sql()
!! 'VALUES ' ~ self.literal_array(@values))
!! 'DEFAULT VALUES';
# RAKUDO: Real string interpolation
"INSERT INTO {%!opts<from>} $columns$values";
}
method update_sql(*%nameds) {
my $values = join $COMMA_SEPARATOR, map {
"{.key} = {self.literal(.value)}"
}, %nameds.pairs;
"UPDATE {%!opts<from>} SET $values";
}
}
class Squerl::Database {
has $!file;
has $!dbh;
# RAKUDO: Cannot type this attribute as Bool
has $.quote_identifiers;
has Str $.identifier_input_method;
has Str $.identifier_output_method;
method open() {
$!dbh = sqlite_open($!file);
}
method close() {
$!dbh.close();
}
method exec($statement) {
my $sth = $!dbh.prepare($statement);
$sth.step();
$sth.finalize();
}
method create_table($_: *@args) {
my $table-name = @args[0];
my $columns = join ', ', gather for @args[1..^*] -> $type, $name {
given $type.lc {
when 'primary_key' { take "$name INTEGER PRIMARY KEY ASC" }
when 'int'|'integer' { take "$name INTEGER" }
when 'str'|'string' { take "$name TEXT" }
default { die "Unknown type $type" }
}
};
.open;
.exec("CREATE TABLE $table-name ($columns)");
.close;
}
method select($_: $what, $table) {
my @rows;
.open;
my $sth = $!dbh.prepare("SELECT $what FROM $table");
while $sth.step() == 100 {
push @rows, [map { $sth.column_text($_) }, ^$sth.column_count()];
}
.close;
return @rows;
}
method from($table) {
return Squerl::Dataset.new(self, :$table,
:quote_identifiers($!quote_identifiers),
:identifier_input_method(
$!identifier_input_method
),
:identifier_output_method(
$!identifier_output_method
));
}
}
class Squerl {
method sqlite($file) {
return Squerl::Database.new(:$file);
}
}