批量插入、修改、
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批量插入
<insert id="insertByBatch" parameterType="java.util.List">
insert into monitor_log
(monitor_id, monitor_date, monitor_stats,
monitor_info,
monitor_product_id, monitor_repair_date,
monitor_repair_userid)
values
<foreach collection="list" item="item" index="index"
separator=",">
(#{item.monitorId,jdbcType=INTEGER},
#{item.monitorDate,jdbcType=TIMESTAMP},
#{item.monitorStats,jdbcType=TINYINT},
#{item.monitorInfo,jdbcType=VARCHAR},
#{item.monitorProductId,jdbcType=INTEGER},
#{item.monitorRepairDate,jdbcType=TIMESTAMP},
#{item.monitorRepairUserid,jdbcType=INTEGER})
</foreach>
</insert>
批量修改
<update id="updateBatch" parameterType="java.util.List">
update monitor_log
<trim prefix="set" suffixOverrides=",">
<trim prefix="monitor_date =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorDate !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorDate,jdbcType=TIMESTAMP}
</if>
</foreach>
</trim>
<trim prefix="monitor_stats =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorStats !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorStats,jdbcType=TINYINT}
</if>
</foreach>
</trim>
<trim prefix="monitor_info =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorInfo !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorInfo,jdbcType=VARCHAR}
</if>
</foreach>
</trim>
<trim prefix="monitor_product_id =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorProductId !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorProductId,jdbcType=INTEGER}
</if>
</foreach>
</trim>
<trim prefix="monitor_repair_date =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorRepairDate !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorRepairDate,jdbcType=TIMESTAMP}
</if>
</foreach>
</trim>
<trim prefix="monitor_repair_userid =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorRepairUserid !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorRepairUserid,jdbcType=INTEGER})
</if>
</foreach>
</trim>
</trim>
where monitor_id in
<foreach collection="list" index="index" item="item"
separator="," open="(" close=")">
#{item.monitorId,jdbcType=BIGINT}
</foreach>
上述collection的值为list,对应的Mapper是这样的
public List dynamicForeachTest(List ids);
测试代码:2.单参数array数组的类型:
<insert id="insertByBatch" parameterType="java.util.List">
insert into monitor_log
(monitor_id, monitor_date, monitor_stats,
monitor_info,
monitor_product_id, monitor_repair_date,
monitor_repair_userid)
values
<foreach collection="list" item="item" index="index"
separator=",">
(#{item.monitorId,jdbcType=INTEGER},
#{item.monitorDate,jdbcType=TIMESTAMP},
#{item.monitorStats,jdbcType=TINYINT},
#{item.monitorInfo,jdbcType=VARCHAR},
#{item.monitorProductId,jdbcType=INTEGER},
#{item.monitorRepairDate,jdbcType=TIMESTAMP},
#{item.monitorRepairUserid,jdbcType=INTEGER})
</foreach>
</insert>
批量修改
<update id="updateBatch" parameterType="java.util.List">
update monitor_log
<trim prefix="set" suffixOverrides=",">
<trim prefix="monitor_date =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorDate !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorDate,jdbcType=TIMESTAMP}
</if>
</foreach>
</trim>
<trim prefix="monitor_stats =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorStats !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorStats,jdbcType=TINYINT}
</if>
</foreach>
</trim>
<trim prefix="monitor_info =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorInfo !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorInfo,jdbcType=VARCHAR}
</if>
</foreach>
</trim>
<trim prefix="monitor_product_id =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorProductId !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorProductId,jdbcType=INTEGER}
</if>
</foreach>
</trim>
<trim prefix="monitor_repair_date =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorRepairDate !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorRepairDate,jdbcType=TIMESTAMP}
</if>
</foreach>
</trim>
<trim prefix="monitor_repair_userid =case" suffix="end,">
<foreach collection="list" item="item" index="index">
<if test="item.monitorRepairUserid !=null ">
when monitor_id=#{item.monitorId} then #{item.monitorRepairUserid,jdbcType=INTEGER})
</if>
</foreach>
</trim>
</trim>
where monitor_id in
<foreach collection="list" index="index" item="item"
separator="," open="(" close=")">
#{item.monitorId,jdbcType=BIGINT}
</foreach>
</update>
1. 如果传入的是单参数且参数类型是一个List的时候,collection属性值为list
2. 如果传入的是单参数且参数类型是一个array数组的时候,collection的属性值为array
3. 如果传入的参数是多个的时候,我们就需要把它们封装成一个Map了,当然单参数也可
item表示集合中每一个元素进行迭代时的别名,
index指 定一个名字,用于表示在迭代过程中,每次迭代到的位置,
open表示该语句以什么开始,
separator表示在每次进行迭代之间以什么符号作为分隔 符,
close表示以什么结束。
foreach元素的属性主要有 item,index,collection,open,separator,close。
在使用foreach的时候最关键的也是最容易出错的就是collection属性,该属性是必须指定的,但是在不同情况 下,该属性的值是不一样的,主要有一下3种情况:
1.单参数List的类型:
1 <select id="dynamicForeachTest" parameterType="java.util.List" resultType="Blog">2 select * from t_blog where id in3 <foreach collection="list" index="index" item="item" open="(" separator="," close=")">4 #{item} 5 </foreach> 6 </select>
public List dynamicForeachTest(List ids);
测试代码:
1 @Test 2 public void dynamicForeachTest() { 3 SqlSession session = Util.getSqlSessionFactory().openSession(); 4 BlogMapper blogMapper = session.getMapper(BlogMapper.class); 5 List ids = new ArrayList(); 6 ids.add(1); 7 ids.add(3); 8 ids.add(6); 9 List blogs = blogMapper.dynamicForeachTest(ids);10 for (Blog blog : blogs)11 System.out.println(blog);12 session.close();13 }
1 <select id="dynamicForeach2Test" parameterType="java.util.ArrayList" resultType="Blog">2 select * from t_blog where id in3 <foreach collection="array" index="index" item="item" open="(" separator="," close=")">4 #{item}5 </foreach>6 </select>
上述collection为array,对应的Mapper代码:
public List dynamicForeach2Test(int[] ids);
对应的测试代码:
1 @Test 2 public void dynamicForeach2Test() { 3 SqlSession session = Util.getSqlSessionFactory().openSession(); 4 BlogMapper blogMapper = session.getMapper(BlogMapper.class); 5 int[] ids = new int[] {1,3,6,9}; 6 List blogs = blogMapper.dynamicForeach2Test(ids); 7 for (Blog blog : blogs) 8 System.out.println(blog); 9 session.close();10 }
3.自己把参数封装成Map的类型
1 <select id="dynamicForeach3Test" parameterType="java.util.HashMap" resultType="Blog">2 select * from t_blog where title like "%"#{title}"%" and id in3 <foreach collection="ids" index="index" item="item" open="(" separator="," close=")">4 #{item}5 </foreach>6 </select>
上述collection的值为ids,是传入的参数Map的key,对应的Mapper代码:
public List dynamicForeach3Test(Map params);
对应测试代码:
@Test public void dynamicForeach3Test() { SqlSession session = Util.getSqlSessionFactory().openSession(); BlogMapper blogMapper = session.getMapper(BlogMapper.class); final List ids = new ArrayList(); ids.add(1); ids.add(2); ids.add(3); ids.add(6); ids.add(7); ids.add(9); Map params = new HashMap(); params.put("ids", ids); params.put("title", "中国"); List blogs = blogMapper.dynamicForeach3Test(params); for (Blog blog : blogs) System.out.println(blog); session.close(); }
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