cascading

Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths

由 假如想象 提交于 2019-11-27 03:24:15
I am getting this error Introducing FOREIGN KEY constraint 'FK_dbo.Regions_dbo.Countries_CountryId' on table 'Regions' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Could not create constraint. See previous errors. I am wondering does this mean my database design is bad? I read you turn off the cascades or something like that but I am just not sure if that is sweeping the problem out of the rug. I am just letting EF generate my tables through my domain class(I am not using any data annotations or fluent

Make multiple dependent / cascading selectOneMenu dropdown lists in JSF

由 你说的曾经没有我的故事 提交于 2019-11-26 15:27:22
I am trying to make 4 dependent menus. When the user chooses an item from the first menu, the second menu will show dependent data and when the user chooses item from the second one , the third one will show dependent data and so on. The user will see items on the first menu only and the other ones will be blank. If he chooses an item on the first menu the second one will show data but the third and the fourth will remain blank, and so on. The user must eventually choose entries from all the 4 menus. <h:selectOneMenu id="first" value="#{nodes.selectState"}> <f:selectItems value="#{nodes

Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths

由 旧城冷巷雨未停 提交于 2019-11-26 10:32:15
问题 I am getting this error Introducing FOREIGN KEY constraint \'FK_dbo.Regions_dbo.Countries_CountryId\' on table \'Regions\' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Could not create constraint. See previous errors. I am wondering does this mean my database design is bad? I read you turn off the cascades or something like that but I am just not sure if that is sweeping the problem out of the rug. I

Make multiple dependent / cascading selectOneMenu dropdown lists in JSF

由 一世执手 提交于 2019-11-26 04:27:07
问题 I am trying to make 4 dependent menus. When the user chooses an item from the first menu, the second menu will show dependent data and when the user chooses item from the second one , the third one will show dependent data and so on. The user will see items on the first menu only and the other ones will be blank. If he chooses an item on the first menu the second one will show data but the third and the fourth will remain blank, and so on. The user must eventually choose entries from all the

Populating cascading dropdown lists in JSP/Servlet

由 风流意气都作罢 提交于 2019-11-25 23:03:02
问题 Suppose I am having three dropdownlist controls named dd1 , dd2 and dd3 . The value of each dropdownlist comes from database. dd3 \'s value depends upon value of dd2 and dd2 \'s value depends on value of dd1 . Can anyone tell me how do I call servlet for this problem? 回答1: There are basically three ways to achieve this: Submit form to a servlet during the onchange event of the 1st dropdown (you can use Javascript for this), let the servlet get the selected item of the 1st dropdown as request
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