mybatis 自身关联 映射

实体类

Java代码


public class Module {

private int id;

private String key;

private String name;

private Module parentModule;

private List<Module> childrenModules;

private String url;

private int sort;

private String show;

private String del;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getKey() {

return key;

}

public void setKey(String key) {

this.key = key;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Module getParentModule() {

return parentModule;

}

public void setParentModule(Module parentModule) {

this.parentModule = parentModule;

}

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public int getSort() {

return sort;

}

public void setSort(int sort) {

this.sort = sort;

}

public String getShow() {

return show;

}

public void setShow(String show) {

this.show = show;

}

public String getDel() {

return del;

}

public void setDel(String del) {

this.del = del;

}

public List<Module> getChildrenModules() {

return childrenModules;

}

public void setChildrenModules(List<Module> childrenModules) {

this.childrenModules = childrenModules;

}

}

Xml代码


<mapper namespace="com.sagaware.caraccess.mapper.ModuleMapper">

<resultMap type="Module" id="moduleResultMap">

<id property="id" column="module_id"/>

<result property="key" column="module_key"/>

<result property="name" column="module_name"/>

<result property="url" column="module_url"/>

<result property="sort" column="module_sort"/>

<result property="show" column="module_show"/>

<result property="del" column="module_del"/>

<!-- 查询父模块 -->

<association property="parentModule" column="module_parent_id" select="getModulesById" />

<!-- 查询子模块 -->

<collection property="childrenModules" column="module_id" select="getChildrenModues" />

</resultMap>

<select id="getModules" parameterType="String" resultMap="moduleResultMap">

select * from tb_module where module_id=2

</select>

<select id="getModulesById" parameterType="int" resultMap="moduleResultMap">

select * from tb_module where module_id = #{module_id}

</select>

<select id="getChildrenModues" parameterType="int" resultMap="moduleResultMap">

select * from tb_module where module_parent_id = #{module_id}

</select>

</mapper>