Question

ibatis映射文件中的<selectKey>

<insert id="insert" parameterClass="projectObject"> <selectKey resultClass="java.lang.Long" keyProperty="projectId" > SELECT HC_PROJECT_SEQ.NEXTVAL AS ID FROM DUAL </selectKey> INSERT INTO HC_PROJECT ( PROJECT_ID, PROJECT_NAME, PROJECT_DESCRIBE,FLAG) VALUES ( #projectId#, #name#, #describle#,1) </insert><selectKey>中间的的select语句什么意思，望详解？

Answer 1

iBATIS SQL Maps 通过 <insert> 元素的子元素 < selectKey> 来支持主键自动生成。
keyProperty="projectId" 定义了主键名称 resultClass="java.lang.Long" 定义返回类型

SELECT HC_PROJECT_SEQ.NEXTVAL AS ID FROM DUAL这个就是要生成的主键，是用自增序列来当主键的

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