单项选择题X 纠错
A.<if "username!=null and username!=’’">
B.<if test="username!=null or username!=’’">
C.<if test="username!=null and username!=’’">
D.<trim test="username!=null and username!=’’">
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单项选择题
A.<resultMap>元素
B.<enviroment>
C.<transactionManager>
D.<databaseProvider>