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单选题
Customer类中有一个Set类型的orders属性,用来存放Order订单对象,在Customer.hbm.xml文件中,用哪个元素映射orders属性()
A

<set>

B

<one-to-many>

C

<many-to-one>

D

<property>


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考题 单选题You need to create a table named ORDERS that contains four columns: 1.an ORDER_ID column of number data type 2.a CUSTOMER_ID column of number data type 3.an ORDER_STATUS column that contains a character data type 4.a DATE_ORDERED column to contain the date the order was placed When a row is inserted into the table, if no value is provided for the status of the order, the value PENDING should be used instead. Which statement accomplishes this?()A CREATE TABLE orders ( order_id NUMBER(10), customer_id NUMBER(8), order_status NUMBER(10) DEFAULT 'PENDING', date_ordered DATE );B CREATE TABLE orders ( order_id NUMBER(10), customer_id NUMBER(8), order_status VARCHAR2(10) = 'PENDING', date_ordered DATE );C CREATE OR REPLACE TABLE orders ( order_id NUMBER(10), customer_id NUMBER(8), order_status VARCHAR2(10) DEFAULT 'PENDING', date_ordered DATE );D CREATE OR REPLACE TABLE orders ( order_id NUMBER(10), customer_id NUMBER(8), order_status VARCHAR2(10) = 'PENDING', date_ordered DATE );E CREATE TABLE orders ( order_id NUMBER(10), customer_id NUMBER(8), order_status VARCHAR2(10) DEFAULT 'PENDING', date_ordered DATE );F CREATE TABLE orders ( order_id NUMBER(10), customer_id NUMBER(8), order_status VARCHAR2(10) DEFAULT 'PENDING', date_ordered VARCHAR2 );

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考题 单选题你正在创建一个ASP.NET应用来追踪一家公司的销售订单。此应用用的是ADO.NETDataSet对象,DataSet包含了两个DataTable对象。一个表的名字为Orders,另一个表名为OrderDetails。来自Orders表的数据显示在列表框中,你希望当用户在列表框中选择了Orders表的信息时,它相应的Orderdetails就会显示在Gri中。你想修改这些对象使你的代码能够找到你选择的order的所有orderdetails信息,你该怎么做?()A 添加DataRelation对象到DataSet对象的Relations集合B 使用DataSet.Merge方法把Orders表和OrderDetails表相互连接起来C 将一个ForeignKeyConstraint添加到OrderDetails表D 将一个keyrefconstraint添加到Dataset架构.