問題描述

在mapper.xml文件配置如下：

<mapper namespace='com.uiyllong.cims.dao.QuestMapper'> <resultMap type='com.uiyllong.cims.model.Selecter' id='resultSel'><id column='selp_id' property='selpId' /><result column='oid' jdbcType='INTEGER' property='oid' /><result column='content' jdbcType='VARCHAR' property='content' /><result column='selseq' jdbcType='INTEGER' property='selseq' /> </resultMap> <resultMap type='com.uiyllong.cims.model.Quest'><id column='qp_id' jdbcType='INTEGER' property='qpId' /><result column='q_content' jdbcType='VARCHAR' property='content' /><result column='qtype' jdbcType='INTEGER' property='qtype' /><result column='seq' jdbcType='INTEGER' property='seq' /><result column='s_oid' jdbcType='INTEGER' property='sOid' /><collection property='selecters' ofType='com.uiyllong.cims.model.Selecter' column='qseq_id' resultMap='resultSel'></collection> </resultMap>

<!-- 插入問題 --> <insert parameterType='com.uiyllong.cims.model.Quest'useGeneratedKeys='true' keyProperty='qpId'>insert into quest_t<trim prefix='(' suffix=')' suffixOverrides=','> <if test='qpId != null'>qp_id, </if> <if test='content != null'>q_content, </if> <if test='qtype != null'>qtype, </if> <if test='seq != null'>seq, </if> <if test='sOid != null'>s_oid, </if></trim><trim prefix='values (' suffix=')' suffixOverrides=','> <if test='qpId != null'>#{qpId,jdbcType=INTEGER}, </if> <if test='content != null'>#{content,jdbcType=VARCHAR}, </if> <if test='qtype != null'>#{qtype,jdbcType=INTEGER}, </if> <if test='seq != null'>#{seq,jdbcType=INTEGER}, </if> <if test='sOid != null'>#{sOid,jdbcType=INTEGER}, </if></trim> </insert>

然后控制器調用后返回的居然一直是1 ，并沒有實現返回主鍵去網上找了一下 都是這樣加了兩個屬性而已useGeneratedKeys='true' keyProperty='qpId'

問題解答

你可能理解錯了，mybatis返回主鍵并不是通過返回值的形式，而是通過set到實體的id上。你可以輸出Quest對象的qpId值，查看自增主鍵。

那你數據庫對應的表本身有沒有設置主鍵自增呢？或者支不支持？