{"id":11371,"date":"2022-09-27T03:51:38","date_gmt":"2022-09-26T22:21:38","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/"},"modified":"2022-09-27T03:51:38","modified_gmt":"2022-09-26T22:21:38","slug":"solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/","title":{"rendered":"[Solved] Perl module, inhereting from DBI , “Can’t call method ‘prepare'” error [duplicate]"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

\n
\n
<\/div>\n
\n
\n

Your code includes this line:<\/p>\n

if (!my $mysqlopen) { &conexion(); }\n<\/code><\/pre>\n
You call your conexion<\/code> sub with no arguments. However, this sub expects several arguments, including a blessed object, that you don’t provide. You might want to fix that. $database<\/code> and $hostname<\/code> also are expected in the arguments.<\/p>\n
Your call to conexion<\/code> will always<\/em> be executed, because my $var<\/code> creates a new variable and initializes it with undef<\/code>\u2014and the negation of undef<\/code> is a true value.<\/p>\n
Then you have this statement:<\/p>\n
our $result = my $connect->prepare($id);\n<\/code><\/pre>\n
my<\/code> creates a new variable $connect<\/code> on which you try to call the method prepare<\/code>. This doesn’t work, as the created variable is no blessed reference but simply undef<\/code>.<\/p>\n
Scope in Perl<\/h3>\n
Here is a verbose example on how lexical scope with my<\/code> works in Perl<\/p>\n
# $var doesn't exist\n\nsub foo {\n   # $var doesn't exist\n   my $var;\n   # $var exists\n   bar();\n   # $var exists\n}\n\n# $var doesn't exist\n\nsub bar {\n   # $var doesn't exist\n   return;\n}\n\n# $var doesn't exist\n<\/code><\/pre>\n
You define a my<\/code> variable mysqlopen<\/code> in conexion<\/code>, then redefine it in consulta<\/code>. It is, however, not the same variable, as these variables reside in different scope.<\/p>\n
Instead, you are likely to add fields mysqlopen<\/code> and connect<\/code> in the object you are passing around, as this is object data. You can then use this information just like the host<\/code> or database<\/code> fields.<\/p>\n
Also, do not call the method conexion<\/code> without an object. Objects are usually created with new<\/code>.<\/p>\n
\n
Edit<\/h3>\n
It is quite difficult for me to debug your code and<\/em> parse your English at the same time, so here is your code with the worst bugs removed. However, I have no experience with DBI, so it may not work directly:<\/p>\n
sub conexion{\n   my $self=shift;\n   die \"I need args!\" unless @_;\n   my($database, $hostname, $user, $pwd)=@_;\n   $self->{host}     = $hostname;\n   $self->{database} = $database;\n   $self->{user}     = $user;\n   $self->{pass}     = $pwd;\n   $self->{connect}  = DBI->connect(\n      \"DBI:mysql:database=$database;host=$hostname;\",\n       $user,\n       $pwd,\n   ) or die $DBI::errstr;\n   $self->{mysqlopen}= 1;\n   return;\n}\n\nsub consulta{\n   my $self = shift;\n   if (not $self->{mysqlopen}) {\n      die \"This object wants to be conexioned before you consulta anything\";\n      # you could also do\n      #    $self->conexion(DEFAULT_VALUES);\n      # but then you would really *have* to provide defaults!\n   }\n   my $id = \"SELECT * FROM save_bookmarks WHERE id='123'\";\n   my $result = $self->{connect}->prepare($id);\n   $result->execute();\n   my @resultado = $result->fetchrow_array();\n   print \"@resultado\\n\";\n   return;\n}\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            6<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Perl module, inhereting from DBI , “Can’t call method ‘prepare'” error [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Your code includes this line: if (!my $mysqlopen) { &conexion(); } You call your conexion sub with no arguments. However, this sub expects several arguments, including a blessed object, that you don’t provide. You might want to fix that. $database and $hostname also are expected in the arguments. Your call to conexion will always … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[3120,442,3119],"class_list":["post-11371","post","type-post","status-publish","format-standard","hentry","category-solved","tag-dbi","tag-perl","tag-perl-module"],"yoast_head":"\n[Solved] Perl module, inhereting from DBI , "Can't call method 'prepare'" error [duplicate] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Perl module, inhereting from DBI , "Can't call method 'prepare'" error [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Your code includes this line: if (!my $mysqlopen) { &conexion(); } You call your conexion sub with no arguments. However, this sub expects several arguments, including a blessed object, that you don’t provide. You might want to fix that. $database and $hostname also are expected in the arguments. Your call to conexion will always ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-26T22:21:38+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] Perl module, inhereting from DBI , “Can’t call method ‘prepare'” error [duplicate]\",\"datePublished\":\"2022-09-26T22:21:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/\"},\"wordCount\":249,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"dbi\",\"perl\",\"perl-module\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/\",\"name\":\"[Solved] Perl module, inhereting from DBI , \\\"Can't call method 'prepare'\\\" error [duplicate] - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-09-26T22:21:38+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] Perl module, inhereting from DBI , “Can’t call method ‘prepare'” error [duplicate]\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775798750\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775798750\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] Perl module, inhereting from DBI , \"Can't call method 'prepare'\" error [duplicate] - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Perl module, inhereting from DBI , \"Can't call method 'prepare'\" error [duplicate] - JassWeb","og_description":"[ad_1] Your code includes this line: if (!my $mysqlopen) { &conexion(); } You call your conexion sub with no arguments. However, this sub expects several arguments, including a blessed object, that you don’t provide. You might want to fix that. $database and $hostname also are expected in the arguments. Your call to conexion will always ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/","og_site_name":"JassWeb","article_published_time":"2022-09-26T22:21:38+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] Perl module, inhereting from DBI , “Can’t call method ‘prepare'” error [duplicate]","datePublished":"2022-09-26T22:21:38+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/"},"wordCount":249,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["dbi","perl","perl-module"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/","url":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/","name":"[Solved] Perl module, inhereting from DBI , \"Can't call method 'prepare'\" error [duplicate] - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-09-26T22:21:38+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-perl-module-inhereting-from-dbi-cant-call-method-prepare-error-duplicate\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] Perl module, inhereting from DBI , “Can’t call method ‘prepare'” error [duplicate]"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775798750","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775798750","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/11371","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=11371"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/11371\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=11371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=11371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=11371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}