7.mybatis的动态查询和分页

<?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">
<!--配置命名空间-->
<mapper namespace="Person">

   <resultMap type="entity.Person" id="Person">
    <!--
    resultMap标签：映射实体与表
    type属性:表示实体全路径
    id属性：为实体与表的映射取一个任意唯一的名字
      -->
    <id column="id" jdbcType="INTEGER" property="id"/>
    <result column="name" jdbcType="VARCHAR" property="name"/>
    <result column="age" jdbcType="INTEGER" property="age"/>
    <result column="remark" jdbcType="VARCHAR" property="remark"/>
   </resultMap>


    <!--添加人员信息-->
    <insert id="addPerson" parameterType="entity.Person">
        INSERT INTO person (name, age, remark) VALUES (#{name}, #{age} ,#{remark})
    </insert>

    <!--根据id删除人员-->
    <delete id="deletePersonById" parameterType="int" >
        DELETE FROM person WHERE id = #{id}
    </delete>

    <!--根据id修改人员信息-->
    <update id="updatePersonById" parameterType="entity.Person">
        UPDATE person SET name = #{name} , age = #{age}, remark = #{remark} WHERE id = #{id};
    </update>

    <!-- 根据id获取用户信息 -->
    <select id="getPersonById" parameterType="int" resultType="entity.Person">
        SELECT * FROM person WHERE id = #{id}
    </select>

    <!--无条件分页分页查询-->
    <select id="getPersonList" parameterType="map" resultType="entity.Person">
        SELECT id, name, age, remark FROM person LIMIT #{start}, #{limit}
    </select>

    <!--根据不同条件查询人员,动态查询-->
    <select id="Person.getPersonList2" parameterType="map" resultType="entity.Person">
        SELECT id, name,age,remark FROM person
        <where>
            <if test="name != null"> AND name = #{name}</if>
            <if test="age != null">AND age = #{age}</if>
            <if test="remark != null">AND remark = #{remark}</if>
        </where>
    </select>

    <!--动态更新员工信息-->
    <update id="updatePerson1" parameterType="entity.Person" >
        UPDATE person
        <set>
            <if test="name != null"> name = #{name},</if>
            <if test="age != null"> age = #{age},</if>
            <if test="remark != null"> remark = #{remark},</if>
        </set>
        WHERE id = #{id}
    </update>

    <!--动态删除人员-->
    <delete id="deldetPerson1">
        DELETE FROM person WHERE id IN
        <!--foreach用于迭代数组元素，
        collection：需遍历的数组
        open：起始位置的标示
        close：结束位置的标示
        separator：元素的分隔符
        item：需迭代数组的名称:可以写成任意字符，但必须与下面#{}内的字符相同
        ${id}:迭代的实际元素
        使用list时写法一样，只是collection="list"-->
        <foreach collection="array" open="(" close=")" separator="," item="id">
          #{id}
        </foreach>
    </delete>

    <!--动态增加员工信息-->
    <insert id="addPerson1" parameterType="entity.Person">
        <!--<include refid="key"/>和<include refid="value"/>表示引用下方的sql片段-->
        INSERT INTO person (<include refid="key"/>) VALUES (<include refid="value"/>)
    </insert>
    <!--书写sql片段-->
    <sql id="key">
        <!--去掉最后一个逗号-->
        <trim suffixOverrides="," >
            <if test="name != null">name,</if>
            <if test="age != null">age,</if>
            <if test="remark != null">remark,</if>
        </trim>
    </sql>
    <sql id="value">
        <trim suffixOverrides=",">
            <if test="name != null">#{name},</if>
            <if test="age != null">#{age},</if>
            <if test="remark != null">#{remark},</if>
        </trim>
    </sql>

</mapper>

7.mybatis的动态查询和分页