之前有开发任务一个接口里面有大量的数据新增和更新操作，导致十分缓慢。使用了批量操作之后速度有明显提升，几乎百倍千倍的速度提升。

博主之前统计过，通过普通接口一次数据库插入大概需要200ms，对于大量新增或更新操作的情况，数据库批量操作是十分有必要的。废话不多说，直接上代码。

博主的resultMap如下：

<resultMap id="BaseResultMap" type="com.luo.domain.Words" >

    <id column="word_no" property="wordNo" jdbcType="BIGINT" />

    <result column="value" property="value" jdbcType="VARCHAR" />

    <result column="filed_class" property="filedClass" jdbcType="VARCHAR" />

    <result column="pinyin" property="pinyin" jdbcType="VARCHAR" />

    <result column="synonym" property="synonym" jdbcType="VARCHAR" />

    <result column="create_date" property="createDate" jdbcType="TIMESTAMP" />

    <result column="update_date" property="updateDate" jdbcType="TIMESTAMP" />

    <result column="operator_no" property="operatorNo" jdbcType="VARCHAR" />

    <result column="src_channel" property="srcChannel" jdbcType="VARCHAR" />

    <result column="latest_operation" property="latestOperation" jdbcType="VARCHAR" />

    <result column="versions" property="versions" jdbcType="BIGINT" />

    <result column="file_index" property="fileIndex" jdbcType="BIGINT" />

    <result column="charac_class" property="characClass" jdbcType="VARCHAR" />

    <result column="weight" property="weight" jdbcType="INTEGER" />

</resultMap>

批量新增

<insert id="addWordsByList" parameterType="java.util.List">

    insert into words (word_no, value, filed_class,

      pinyin, synonym, create_date,

      update_date, operator_no, src_channel,

      latest_operation, versions, file_index,

      charac_class, weight)

    values

    <foreach collection="list" item="item" index="index" separator="," >

        (#{item.wordNo},#{item.value},#{item.filedClass},#{item.pinyin},

        #{item.synonym},#{item.createDate},#{item.updateDate},#{item.operatorNo},

        #{item.srcChannel},#{item.latestOperation},#{item.versions},#{item.fileIndex},

        #{item.characClass},#{item.weight})

    </foreach>

</insert>

接口：

public void addWordsByList(List<Words> wordsList);

批量更新

批量更新必须在添加如下数据库连接配置：&allowMultiQueries=true，否则会报SQL格式错误

比如MySQL：

jdbc:MySQL://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true

<update id="updateWordsByList"  parameterType="java.util.List">

    <foreach collection="list" item="item" index="index" separator=";">

       update words

       <set >

          <if test="item.value != null" >

            value = #{item.value,jdbcType=VARCHAR},

          </if>

          <if test="item.filedClass != null" >

            filed_class = #{item.filedClass,jdbcType=VARCHAR},

          </if>

          <if test="item.pinyin != null" >

            pinyin = #{item.pinyin,jdbcType=VARCHAR},

          </if>

          <if test="item.synonym != null" >

            synonym = #{item.synonym,jdbcType=VARCHAR},

          </if>

          <if test="item.createDate != null" >

            create_date = #{item.createDate,jdbcType=TIMESTAMP},

          </if>

          <if test="item.updateDate != null" >

            update_date = #{item.updateDate,jdbcType=TIMESTAMP},

          </if>

          <if test="item.operatorNo != null" >

            operator_no = #{item.operatorNo,jdbcType=VARCHAR},

          </if>

          <if test="item.srcChannel != null" >

            src_channel = #{item.srcChannel,jdbcType=VARCHAR},

          </if>

          <if test="item.latestOperation != null" >

            latest_operation = #{item.latestOperation,jdbcType=VARCHAR},

          </if>

          <if test="item.versions != null" >

            versions = #{item.versions,jdbcType=BIGINT},

          </if>

          <if test="item.fileIndex != null" >

            file_index = #{item.fileIndex,jdbcType=BIGINT},

          </if>

          <if test="item.characClass != null" >

            charac_class = #{item.characClass,jdbcType=VARCHAR},

          </if>

          <if test="item.weight != null" >

            weight = #{item.weight,jdbcType=INTEGER},

          </if>

        </set>

        where word_no = #{item.wordNo,jdbcType=BIGINT}

    </foreach>

</update>

接口：

public void updateWordsByList(List<Words> wordsList);