MySQL和mybatis查询相关

 2.mybatis批量插入更新

　　方法一：

<update id="batchUpdate" parameterType="java.util.List"> 
      <foreach separator=";" index="index" item="item" collection="list" close="" open=""><span style="color: #000000"> 
      update sys_group set level </span>= #{item.level,jdbcType=<span style="color: #000000">INTEGER}
       where group_id </span>= #{item.groupId,jdbcType=<span style="color: #000000">INTEGER}
      </span></foreach> 
  </update>

　　方法二：

<update id="batchUpdate1" parameterType="java.util.List"><span style="color: #000000"> 
     
      update sys_group set level </span>= <span style="color: #0000ff">null</span><span style="color: #000000"> where level in
       </span><foreach separator="," index="index" item="item" collection="list" close=")" open="("><span style="color: #000000"> 
         #{item}
      </span></foreach> 
  </update>

 3.mybatis映射

<resultMap id="BaseResultMap" type="me.gacl.domain.User" >
      <id column="user_id" property="userId" jdbcType="CHAR" />
      <result column="user_name" property="userName" jdbcType="VARCHAR" />
      <result column="user_birthday" property="userBirthday" jdbcType="DATE" />
      <result column="user_salary" property="userSalary" jdbcType="DOUBLE" />
    </resultMap>
   <sql id="Base_Column_List" ><span style="color: #000000">
     user_id, user_name, user_birthday, user_salary
   </span></sql>

4.mybatis查询select

<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" ><span style="color: #000000">
     select 
     </span><include refid="Base_Column_List" /><span style="color: #000000">
     from t_user
     where user_id </span>= #{userId,jdbcType=<span style="color: #000000">CHAR}
   </span></select>

5.mybatis删除delete

<delete id="deleteByPrimaryKey" parameterType="java.lang.String" ><span style="color: #000000">
     delete from t_user
     where user_id </span>= #{userId,jdbcType=<span style="color: #000000">CHAR}
   </span></delete>

6.mybatis插入insert

　　一：

 <insert id="insert" parameterType="me.gacl.domain.User" ><span style="color: #000000">
     insert into t_user (user_id, user_name, user_birthday, 
       user_salary)
     values (#{userId,jdbcType</span>=CHAR}, #{userName,jdbcType=VARCHAR}, #{userBirthday,jdbcType=<span style="color: #000000">DATE}, 
       #{userSalary,jdbcType</span>=<span style="color: #000000">DOUBLE})
   </span></insert>

　　二：

 <insert id="insertSelective" parameterType="me.gacl.domain.User" ><span style="color: #000000">
     insert into t_user
     </span><trim prefix="(" suffix=")" suffixOverrides="," >
       <<span style="color: #0000ff">if</span> test="userId != null" ><span style="color: #000000">
         user_id,
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userName != null" ><span style="color: #000000">
         user_name,
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userBirthday != null" ><span style="color: #000000">
         user_birthday,
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userSalary != null" ><span style="color: #000000">
         user_salary,
       </span></<span style="color: #0000ff">if</span>>
     </trim>
     <trim prefix="values (" suffix=")" suffixOverrides="," >
       <<span style="color: #0000ff">if</span> test="userId != null" ><span style="color: #000000">
         #{userId,jdbcType</span>=<span style="color: #000000">CHAR},
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userName != null" ><span style="color: #000000">
         #{userName,jdbcType</span>=<span style="color: #000000">VARCHAR},
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userBirthday != null" ><span style="color: #000000">
         #{userBirthday,jdbcType</span>=<span style="color: #000000">DATE},
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userSalary != null" ><span style="color: #000000">
         #{userSalary,jdbcType</span>=<span style="color: #000000">DOUBLE},
       </span></<span style="color: #0000ff">if</span>>
     </trim>
   </insert>

7.mybatis更新update

　　一：

<update id="updateByPrimaryKey" parameterType="me.gacl.domain.User" ><span style="color: #000000">
     update t_user
     set user_name </span>= #{userName,jdbcType=<span style="color: #000000">VARCHAR},
       user_birthday </span>= #{userBirthday,jdbcType=<span style="color: #000000">DATE},
       user_salary </span>= #{userSalary,jdbcType=<span style="color: #000000">DOUBLE}
     where user_id </span>= #{userId,jdbcType=<span style="color: #000000">CHAR}
   </span></update>

　　二：

<update id="updateByPrimaryKeySelective" parameterType="me.gacl.domain.User" ><span style="color: #000000">
     update t_user
     </span><set >
       <<span style="color: #0000ff">if</span> test="userName != null" ><span style="color: #000000">
         user_name </span>= #{userName,jdbcType=<span style="color: #000000">VARCHAR},
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userBirthday != null" ><span style="color: #000000">
         user_birthday </span>= #{userBirthday,jdbcType=<span style="color: #000000">DATE},
       </span></<span style="color: #0000ff">if</span>>
       <<span style="color: #0000ff">if</span> test="userSalary != null" ><span style="color: #000000">
         user_salary </span>= #{userSalary,jdbcType=<span style="color: #000000">DOUBLE},
       </span></<span style="color: #0000ff">if</span>>
     </set><span style="color: #000000">
     where user_id </span>= #{userId,jdbcType=<span style="color: #000000">CHAR}
   </span></update>

MySQL和mybatis查询相关

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