MyBatis<forEach/>如何遍历Map参数里的值

本文介绍了一个使用MyBatis进行批量博客数据插入的例子。通过&lt;foreach&gt;标签实现了对多个博客数据的批量处理,展示了如何配置mapper文件及对应的Java代码。

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纠结了好一阵子, 最终给我解决了。

直接上代码了:

mapper文件:

	<insert id="saveBlogs">
		INSERT INTO blog (user_id, blog_id) VALUES
		<foreach collection="blogs" item="blog" separator=",">
		(#{userId}, #{blog})
		</foreach>
	</insert>

java代码:

        public void saveBlogs(Integer userId, List blogs) {
                Map param = new HashMap();
                param.put("userId", userId);
                param.put("blogs", blogs);
                getSqlSession().insert("Blog.saveBlogs", blogs);
        }

<forEach/>的collection属性填map参数里的key, 不要用list、array等关键字。。

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.ruoyi.system.mapper.EmployeeMapper"> <resultMap type="Employee" id="EmployeeResult"> <result property="id" column="id" /> <result property="factory" column="factory" /> <result property="department" column="department" /> <result property="position" column="position" /> <result property="employee_name" column="employee_name" /> <result property="employee_jobNumber" column="employee_jobNumber" /> <result property="phonenumber" column="phonenumber" /> <result property="entry_time" column="entry_time" /> </resultMap> <sql id="selectEmployeeVo"> select id, factory, department, position,employee_name,employee_jobNumber,phonenumber,entry_time from employee_data </sql> <select id="getEmployeeList" parameterType="Employee" resultMap="EmployeeResult"> <include refid="selectEmployeeVo"/> <where> <if test="employee_name != null and employee_name != ''"> and employee_name like concat('%', #{employee_name}, '%')</if> <if test="employee_jobNumber != null and employee_jobNumber != ''"> and employee_jobNumber = #{employee_jobNumber}</if> </where> </select> <select id="selectEmployeeById" parameterType="int" resultMap="EmployeeResult"> <include refid="selectEmployeeVo"/> where id = #{id} </select> <update id="updateEmployee" parameterType="Employee"> update Employee <trim prefix="SET" suffixOverrides=","> <if test="factory != null and factory != ''">factory = #{factory},</if> <if test="department != null and department != ''">department = #{department},</if> <if test="position != null and position != ''">position = #{position},</if> <if test="employee_name != null and employee_name != ''">employee_name = #{employee_name},</if> <if test="employee_jobNumber != null">employee_jobNumber = #{employee_jobNumber},</if> <if test="phonenumber != null and phonenumber != ''">phonenumber = #{phonenumber},</if> <if test="entry_time != null and entry_time != ''">entry_time = #{entry_time},</if> </trim> where id = #{id} </update> <delete id="deleteEmployeeById" parameterType="int"> delete from employee_data where id = #{id} </delete> <delete id="deleteEmployeeByIds" parameterType="String"> delete from employee_data where id in <foreach item="id" collection="array" open="(" separator="," close=")"> #{id} </foreach> </delete> <insert id="insertEmployee" parameterType="Employee" useGeneratedKeys="true" keyProperty="id"> insert into employee_data <trim prefix="(" suffix=")" suffixOverrides=","> <if test="factory != null and factory != ''">factory,</if> <if test="department != null and department != ''">department,</if> <if test="position != null and position != ''">position = #{position},</if> <if test="employee_name != null and employee_name != ''">employee_name = #{employee_name},</if> <if test="employee_jobNumber != null">employee_jobNumber = #{employee_jobNumber},</if> <if test="phonenumber != null and phonenumber != ''">phonenumber = #{phonenumber},</if> <if test="entry_time != null and entry_time != ''">entry_time = #{entry_time},</if> examine_result, </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="factory != null and factory != ''">factory,</if> <if test="department != null and department != ''">department,</if> <if test="position != null and position != ''">position = #{position},</if> <if test="employee_name != null and employee_name != ''">employee_name = #{employee_name},</if> <if test="employee_jobNumber != null">employee_jobNumber = #{employee_jobNumber},</if> <if test="phonenumber != null and phonenumber != ''">phonenumber = #{phonenumber},</if> <if test="entry_time != null and entry_time != ''">entry_time = #{entry_time},</if> 1 </trim> </insert> </mapper>
06-06
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