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我们可以为两个没有关系的模型表建立联系,也可以将已有的关系删除掉。
1. 单击顶部菜单的添加关系,打开添加关系的对话框。
2. 配置关系属性。
可见新增加关系时需要设置的项目与管理关系界面中一致,都是设置关系的名称、基数、条件等属性。
首先我们为关系添加一个名称。
选择源表到目标表的关系基数,并设置是否开启双向交叉过滤以及添加关系后是否为禁用状态。
有关这三个设置项的含义,请您参见管理表关系中的介绍。
3. 配置关系的条件
选择该关系的两个表:源表和目标表。然后选择源列和目标列。
type=info
提示
源表和目标表的选择与基数的设置是对应的。
比如基数选择1对N,源表为A,目标表为B。与基数选择N对1,源表为B,目标表为A。效果是相同的。
单击添加按钮,可添加多个关联字段。
4. 单击添加完成。新的关系将出现在关系列表中。画布当中也会画出新的关系箭头。
我们在画布当中,将一个表拖拽到另一个表上方后松开鼠标,即可快速添加表关系。
比如将本地表1拖拽到 Customers 表上方,然后松开鼠标即可打开新建关系的窗口。
关于新建关系的其他介绍,请您参考本文上方手动添加关系时的介绍,这里就不做赘述。
在编辑数据模型过程中,如果确定不需要某个表关系时,就可以执行删除操作。
在画布中单击关系连接线,使连接线中间出现删除关系图标。单击图标。
在弹出的删除确认对话框中单击是。
可见关系已被删除。