{"id":89,"date":"2020-02-27T13:40:20","date_gmt":"2020-02-27T13:40:20","guid":{"rendered":"https:\/\/mendixandme.de\/?p=89"},"modified":"2020-02-27T13:40:20","modified_gmt":"2020-02-27T13:40:20","slug":"datentypen-in-java-actions","status":"publish","type":"post","link":"https:\/\/mendixandme.de\/index.php\/2020\/02\/27\/datentypen-in-java-actions\/","title":{"rendered":"Datentypen in Java Actions"},"content":{"rendered":"\n

Hin und wieder kommt man bei Mendix an den Punkt, an dem man mehr will. Das ist meist der Moment in dem man anf\u00e4ngt eigene Java Actions zu benutzen. Um das zu tun muss man nat\u00fcrlich Daten\/Parameter an eine Java Action \u00fcbergeben und Daten wieder zur\u00fcckbekommen. Welche Datentypen in Java entsprechen aber welchen Datentypen in Mendix? Besonders wenn man mit nicht definierten Objekten arbeitet muss man wissen welche Daten man in welches Attribut packen kann. Hier mal eine \u00dcbersicht welche Datentypen aus Mendix wie in einer Java Action landen wenn diese als Parameter \u00fcbergeben werden.<\/p>\n\n\n\n

\u00dcbergabeparameter Datentypen<\/h2>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Type in Modeler<\/th>Type in Java Action<\/th>Javadoc<\/th>\n<\/tr>\n<\/thead>\n
Object of Entity<\/td>Proxy Object<\/td><\/td>\n<\/tr>\n
Any Object<\/td>IMendixObject<\/td><\/td>\n<\/tr>\n
Microflow<\/td>java.lang.String<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/String.html<\/a><\/td>\n<\/tr>\n
Boolean<\/td>java.lang.Boolean<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/Boolean.html<\/a><\/td>\n<\/tr>\n
Date and Time<\/td>java.util.Date<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/util\/Date.html<\/a><\/td>\n<\/tr>\n
Decimal<\/td>java.math.BigDecimal<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/math\/BigDecimal.html<\/a><\/td>\n<\/tr>\n
Enumeration<\/td>Proxy Enum<\/td><\/td>\n<\/tr>\n
Integer\/Long<\/td>java.lang.Long<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/Long.html<\/a><\/td>\n<\/tr>\n
String<\/td>java.lang.String<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/String.html<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n

Wie man sieht werden grunds\u00e4tzlich keine primitiven Datentypen verwendet. Wenn man mit primitiven Datentypen arbeitet muss man also gegebenenfalls ein Objekt erzeugen, sofern man sie zur\u00fcckgeben oder auf ein Attribut speichern will. Wei\u00df man was Mendix erwartet ist dies nat\u00fcrlich kein Problem.<\/p>\n\n\n\n

\u00c4hnlich sieht das ganze auf den Proxy Klassen aus die Mendix f\u00fcr die Entities im Domain Model generiert. Folgende Attributtypen haben folgende Entsprechung in der Proxy Klasse.<\/p>\n\n\n\n

Datentypen Proxy Attribute<\/h2>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Domain Model Datentyp<\/th>Java Datentyp<\/th>Javadoc<\/th>\n<\/tr>\n<\/thead>\n
AutoNumber<\/td>java.lang.Long<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/Long.html<\/a><\/td>\n<\/tr>\n
Binary (get)<\/td>java.io.OutputStream<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/io\/OutputStream.html<\/a><\/td>\n<\/tr>\n
Binary (set)<\/td>java.io.InputStream<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/io\/InputStream.html<\/a><\/td>\n<\/tr>\n
Boolean<\/td>java.lang.Boolean<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/Boolean.html<\/a><\/td>\n<\/tr>\n
Date and Time<\/td>java.util.Date<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/util\/Date.html<\/a><\/td>\n<\/tr>\n
Decimal<\/td>java.math.BigDecimal<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/math\/BigDecimal.html<\/a><\/td>\n<\/tr>\n
Enum<\/td>Enum Proxy Objekt<\/td><\/td>\n<\/tr>\n
Hashed String<\/td>java.lang.String<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/String.html<\/a><\/td>\n<\/tr>\n
Integer<\/td>java.lang.Integer<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/Integer.html<\/a><\/td>\n<\/tr>\n
Long<\/td>java.lang.Long<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/Long.html<\/a><\/td>\n<\/tr>\n
String<\/td>java.lang.String<\/td>https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/index.html?java\/lang\/String.html<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n

Interessant hierbei ist vielleicht unter Anderem, dass zwischen Integer und Long unterschieden wird, w\u00e4hrend dies bei \u00dcbergabeparametern nicht der Fall ist. Hier ist also unter Umst\u00e4nden Vorsicht geboten.<\/p>\n\n\n\n

Arbeitet man mit IMendixObject Objekten (etwas was man immer tut wenn man eine Java Action f\u00fcr beliebige Objekte erstellt), so werden auf diesem Objekt die gleichen Datentypen wie auf Proxy Klassen verwendet.<\/p>\n","protected":false},"excerpt":{"rendered":"

Hin und wieder kommt man bei Mendix an den Punkt, an dem man mehr will. Das ist meist der Moment in dem man anf\u00e4ngt eigene Java Actions zu benutzen. Um das zu tun muss man nat\u00fcrlich Daten\/Parameter an eine Java Action \u00fcbergeben und Daten wieder zur\u00fcckbekommen. Welche Datentypen in Java entsprechen aber welchen Datentypen in…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,10],"tags":[31,30,28,29],"yoast_head":"\nDatentypen in Java Actions - Mendix and Me<\/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:\/\/mendixandme.de\/index.php\/2020\/02\/27\/datentypen-in-java-actions\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Datentypen in Java Actions - Mendix and Me\" \/>\n<meta property=\"og:description\" content=\"Hin und wieder kommt man bei Mendix an den Punkt, an dem man mehr will. Das ist meist der Moment in dem man anf\u00e4ngt eigene Java Actions zu benutzen. 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