Mybatis框架中Mapper文件传值参数获取。【Mybatis】

Mybatis框架中，Mapper文件参数获取一般有以下几种：

1、参数个数为1个（string或者int）

dao层方法为以下两种：

[java] view plain copy







/**

* 单个int型

*/

public List<UserComment> findByDepartmentId(int dapartmentId);

/**

* 单个string型

*/

public Source findByTitle(String title);

对应的Mapper取值：

取值时应当注意，参数名字应该与dao层传入的参数名字相同。

[html] view plain copy







/*单个int型*/

<select id="findByDepartmentId" resultType="com.bonc.wechat.entity.publicserver.UserComment">

select * from wx_user_comment where

department_id=#{departmentId}

order by createtime desc;

</select>

/*单个string型*/

<select id="findByTitle" parameterType="java.lang.String" resultType="com.bonc.wechat.entity.publicserver.Source">

select * from wx_source where

title=#{title};

</select>

/*****或者直接使用通用方法获取参数*****/

<select id="findByDepartmentId" resultType="com.bonc.wechat.entity.publicserver.UserComment">

select * from wx_user_comment where

department_id=#{_parameter}

order by createtime desc;

</select>

<select id="findByTitle" parameterType="java.lang.String" resultType="com.bonc.wechat.entity.publicserver.Source">

select * from wx_source where

title=#{_parameter};

</select>

2、参数个数为多个。

dao层方法：

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/*****1.正常传参*****/

public Dailyuserinfo findStutaByUserAndDaily(String username,String dailyid);

/*****2.注解传参*****/

public List<UserTab> selectUserListExceptUserId

(@Param("USER_ID")String USER_ID,

@Param("LIMIT_POS")int LIMIT_POS,

@Param("LIMIT_SIZE")int LIMIT_SIZE);

对应的Mapper取值：

取值时应当注意，参数名字应该与dao层传入的参数名字相同。

[html] view plain copy







/****正常传参方式参数获取****/

<select id="findStutaByUserAndDaily"

parameterType="java.lang.String"

resultType="com.thinkgem.jeesite.modules.dailynews.entity.Dailyuserinfo">

select * from daily_user_info

where login_name=#{username}

And daily_id=#{dailyid};

</select>

/****注解传参方式参数获取****/

<select id="selectUserListExceptUserId"

resultMap="userResMap">

select * from MH_USER

where USER_ID!=#{USER_ID}

and USER_STATE>9

order by NICK_NAME

limit #{LIMIT_POS},#{LIMIT_SIZE}

</select>

3、参数为map的形式。

mapper中使用map的key取值。

dao中的方法。

[java] view plain copy







/*****1.参数为map*****/

public List<Source> search(Map<String,Object> param);

/***2.map的内部封装***/

Map<String,Object> param=new HashMap<String,Object>();

param.put("page", (page-1)*pageSize);

param.put("pageSize",pageSize);

param.put("keyword","%"+keyword+"%");

param.put("type",type);

List<Source> sources=sourceDao.search(param);

对应的Mapper取值：

[html] view plain copy







<select id="search"

parameterType="java.util.Map"

resultType="com.bonc.wechat.entity.publicserver.Source">

select * from wx_source

where

<if test="keyword != null and keyword != ''">

(title like #{keyword} or content like #{keyword}) and

</if>

type=#{type}

order by ordernum asc

limit #{page},#{pageSize};

</select>

4、参数为对象。

mapper中使用对象中的属性直接取值，或者【对象.属性】取值。

dao中的方法。

[java] view plain copy







/*****使用对象传参*****/

public int addUserComment(UserComment UC);

/*****对象中的属性*****/

private int id;

private int department_id;

private String telphone;

private String content;

private String createtime;

对应的Mapper取值：

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<insert id="addUserComment"

parameterType="com.bonc.wechat.entity.publicserver.UserComment">

insert into wx_user_comment

(department_id,

telphone,

content,

createtime)

values(#{department_id},

#{telphone},

#{content},

#{createtime});

</insert>

*使用【对象.属性】取值。

dao层：

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/******此示例中直接省去dao层，service直接绑定mapper层******/

public PageResult findPanoramaPage(Page page) throws Exception{

List<PageData> panoramaList = new ArrayList<PageData>();

try {

panoramaList = (List<PageData>)dao.findForList("PanoramaMapper.findPagePanorama", page);

} catch (Exception e) {

e.printStackTrace();

}

PageResult pageResult = new PageResult(page.getTotalResult(),panoramaList);

return pageResult;

}

对应的Mapper取值：

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<select id="findPagePanorama"

parameterType="page"

resultType="pd">

SELECT

a.id as id,

a.project_code as projectCode,

a.project_name as projectName,

a.project_addr as projectAddr,

a.project_type as projectType

FROM

calm_project a

WHERE

a.is_valid=1

<if test="page.projectType != null and page.projectType != ''">

AND a.project_type = #{page.projectType}

</if>

<if test="page.keyword != null and page.keyword != ''">

AND (a.project_name LIKE '%${page.keyword}%' OR a.project_code LIKE '%${page.keyword}%')

</if>

ORDER BY

a.sort

</select>

推荐使用第三和第四种，将所传的数据在controller层或者service层封装起来，传入mapper文件中取值。