【mybatis-记录】

 <?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.yhb.jsxn.mapper.FinanceProductsUsersMapper">
 <!-- mybatis sql语句中的转义字符的书写：
         1、在xml的sql语句中，不能直接用大于号、小于号要用转义字符
         如果用小于号会报错误如下：
         org.apache.ibatis.builder.BuilderException: Error creating document instance.
         Cause: org.xml.sax.SAXParseException: The content of elements must consist of well-formed character data or markup.
         转义字符
                 小于号        ＜            &lt;
                 大于号        >        &gt;
                 和            &         &amp;
                 单引号        '        &apos;
                 双引号        "       &quot;
         2、使用<![CDATA[  你的sql语句  ]]>（sql语句中的<where><if>等标签不会被解析）
          如：
          <![CDATA[
                 select * from
               (select t.*, ROWNUM as rowno from tbl_user t where ROWNUM <= #{page.end,jdbcType=DECIMAL}) table_alias
               where table_alias.rowno >#{page.start,jdbcType=DECIMAL}
              ]]>
 -->

 <!--    Mybatis批量插入Oracle、MySQL 

  --> 

 <!-- mysql数据库的数据类型： -->
 <!--

 -->

 <!--  mysql修改字符编码
 　　X:\%path%\MySQL\MySQL Server 5.0\bin\MySQLInstanceConfig.exe
 　　重新启动设置，将默认编码设置为utf8.这样就能达到我们所要的效果了。

 1、修改数据库字符编码

 mysql> alter database mydb character set utf8 ;

 2、创建数据库时，指定数据库的字符编码

 mysql> create database mydb character set utf8 ;

 3、查看mysql数据库的字符编码

 mysql> show variables like 'character%'; //查询当前mysql数据库的所有属性的字符编码

 +--------------------------+----------------------------+
 | Variable_name            | Value                      |
 +--------------------------+----------------------------+
 | character_set_client     | latin1                     |
 | character_set_connection | latin1                     |
 | character_set_database   | utf8                       |
 | character_set_filesystem | binary                     |
 | character_set_results    | latin1                     |
 | character_set_server     | utf8                       |
 | character_set_system     | utf8                       |
 | character_sets_dir       | /usr/share/mysql/charsets/ |
 +--------------------------+----------------------------+

 4、修改mysql数据库的字符编码

 修改字符编码必须要修改mysql的配置文件my.cnf,然后重启才能生效

 通常需要修改my.cnf的如下几个地方：

 【client】下面，加上default-character-set=utf8，或者character_set_client=utf8

 【mysqld】下面，加上character_set_server = utf8 ；

 因为以上配置，mysql默认是latin1，如果仅仅是通过命令行客户端，mysql重启之后就不起作用了。

 如下是客户端命令行修改方式，不推荐使用

 mysql> set character_set_client=utf8 ;

 mysql> set character_set_connection=utf8 ;

 mysql> set character_set_database=utf8 ;

 mysql> set character_set_database=utf8 ;

 mysql> set character_set_results=utf8 ;

 mysql> set character_set_server=utf8 ;

 mysql> set character_set_system=utf8 ;

 mysql> show variables like 'character%';
 +--------------------------+----------------------------+
 | Variable_name            | Value                      |
 +--------------------------+----------------------------+
 | character_set_client     | utf8                       |
 | character_set_connection | utf8                       |
 | character_set_database   | utf8                       |
 | character_set_filesystem | binary                     |
 | character_set_results    | utf8                       |
 | character_set_server     | utf8                       |
 | character_set_system     | utf8                       |
 | character_sets_dir       | /usr/share/mysql/charsets/ |
 +--------------------------+----------------------------+

     -> ;
 +--------------------------+---------------------------------------------------------------+
 | Variable_name            | Value                                                         |
 +--------------------------+---------------------------------------------------------------+
 | character_set_client     | utf8                                                          |
 | character_set_connection | utf8                                                          |
 | character_set_database   | utf8                                                          |
 | character_set_filesystem | binary                                                        |
 | character_set_results    | utf8                                                          |
 | character_set_server     | utf8                                                          |
 | character_set_system     | utf8                                                          |
 | character_sets_dir       | C:\Program Files (x86)\MySQL\MySQL Server 5.5\share\charsets\ |
 +--------------------------+---------------------------------------------------------------+

 8 rows in set (0.00 sec)
 8 rows in set (0.00 sec)
  -->
     <!-- 查询结果映射 -->
     <!--解决数据库表字段列明和实体vo不匹配问题  -->
     <resultMap id="BaseResultMap" type="com.yhb.jsxn.entity.FinanceProductsUsers">
         <!-- 主键映射 -->
         <id column="FPUID" property="FPUID"                                     jdbcType="INTEGER" />
         <result column="UserID" property="UserID"                                 jdbcType="VARCHAR" />
         <result column="FProductsRates" property="FProductsRates"                 jdbcType="FLOAT" />
         <result column="FProductsBuyMoney" property="FProductsBuyMoney"         jdbcType="DECIMAL" />
         <result column="FProductsBuyTime" property="FProductsBuyTime"             jdbcType="TIMESTAMP" />
         <result column="FProductsRateInNum" property="FProductsRateInNum"         jdbcType="INTEGER" />

     </resultMap>

     <!-- select 语句
         select 标签属性：
             id： id编号
             parameterType: 获取的参数值：
                 eg：
                     java.lang.Integer
                     map
             resultMap：
                 eg：
                     返回的是一个映射结果集，对应一个实体vo类
                             想用ParameterType=Map传入多个参数构造SQL进行查询:
                             <select id="getBusList" resultMap="busListMap" parameterType="java.util.Map">
                                     select bs.bus_id as bus_id,bs.arrive_time as up_time,b.start_station
                                     as start_station_id,
                                     b.end_station as end_station_id
                                     from bus b , bus_station bs where b.bus_id = bs.bus_id and
                                     bs.station_id=#{upStationId}
                                     and is_up=1 and b.up_station_line like
                                     #{upStationLineLike} and b.down_station_line
                                     like
                                     #{downStationLineLike}
                                     and (b.daily=1 or b.weekly like #{weeklyLike} or b.run_day like
                                     #{runDayLike} )
                                     order by bs.arrive_time asc
                                 </select>
                             调试时报 Parameter not found异常
                             解决方法，使用此方式传参，必须在对应的接口方法用@Param标签定义参数value才行:

                             public List<Bus> getBusList(@Param(value = "upStationId") long upStationId,
                                         @Param(value = "upStationLineLike") String upStationLineLike,
                                         @Param(value = "downStationLineLike") String downStationLineLike,
                                         @Param(value = "weeklyLike") String weeklyLike,
                                         @Param(value = "runDayLike") String runDayLike
                                         ){} ;
             resultType：
                 eg：
                     Integer
                     String
                     Decimal
                     int
      -->
    <select id="selectFinByFPUID" resultMap="BaseResultMap" parameterType="java.lang.Integer">
    select
     *
     from financeproducts_users
     where FPUID = #{FPUID,jdbcType=INTEGER}
   </select>
     <select id="selectAllByFPid" resultMap="BaseResultMap" parameterType="map">
         select
         a.TrueName,a.UserName,b.FProductsBuyMoney,b.FProductsBuyTime from
         accounts_users a, financeproducts_users b where a.UserID = b.UserID
         and b.FPid=#{fpid} and FProductsCountNum &gt; FProductsRateInNum order
         by b.FProductsBuyTime DESC limit
         #{pageNo},#{size}
     </select>
     <select id="getFinancialUsers" resultType="String">
         select distinct userid from financeproducts_users
     </select>
     <select id="selectNewProduct" parameterType="String" resultType="Integer">
         select count(*) from financeproducts_users where UserID =#{userId} and
         FPid in (140,141)
     </select>
     <select id="getUserFreeze"  parameterType="map" resultType="Decimal">
         select sum(FproductsBuyMoney-FProductsRateMoney) userFrezz from
         financeproducts_users where UserID =#{userId} and FProductsEm_k2=1
     </select>
     <!--     <if test="array.length > 0">
                     <where>
                         <foreach collection="array"  open="(" item="age" close=")" separator=",">
                             and age in (#{age})
                         </foreach>
                     </where>
                 </if> -->

     <select id="selectByUserIdById" resultMap="BaseResultMap" parameterType="Map">
         select * from (
         select
         a.UserID,a.FProductsBuyMoney,a.FProductsName,b.ProfitMoney,b.UserId_Get,b.UserName_Give
         from financeproducts_users a
         left join
         (SELECT
         UserId_Give,UserId_Get,UserName_Give,ProfitMoney FROM
         accounts_distributor_profit
         where UserId_Get=#{Id} group by UserId_Give
         )b
         on a.UserId=b.UserId_Give
         )a where a.UserId_Get is not null
     </select>
      <select id="getHistoricalBuyProductsByName" resultMap="BaseResultMap"
         parameterType="hashMap">
         select
         FProductsName,FProductsRateInNum,FProductsImgs,FProductsCountRateMoney,FProductsBuyMoney,
         FProductsBuyTime,FProductsCountNum
         from financeproducts_users
         where
         <if test="UserID !=null">
             UserID =#{UserID}
         </if>
         and FProductsCountNum<![CDATA[<=]]>FProductsRateInNum
         <if test="startTime !=null">
             and DATE_FORMAT(FProductsBuyTime,'%Y-%m-%d')<![CDATA[>=]]>#{startTime}
         </if>
         <if test="dayNum !=null">
             and FProductsCountNum <![CDATA[<=]]>#{dayNum}
         </if>
         <if test="FProductsName !=null and FProductsName !=''">
         <!-- mysql> select concat_ws(',','11','22','33');

                 +-------------------------------+
                 | concat_ws(',','11','22','33') |
                 +-------------------------------+
                 | 11,22,33 |
                 +-------------------------------+
         oracle 可以使用||来连接
         -->
             and FProductsName like CONCAT('%', #{FProductsName}, '%')
         </if>
     </select>
     <select id="selectAlreadyByUserId" resultMap="BaseResultMap"
         parameterType="Map">
         select
         FProductsName,FProductsRateInNum,FProductsImgs,FProductsCountRateMoney,FProductsBuyMoney,
         FProductsBuyTime,FProductsCountNum
         from financeproducts_users
         where
         FProductsCountNum &gt; FProductsRateInNum and UserID =#{UserID}
         order
         by FProductsBuyTime
     </select>
         <!--根据查询条件获取历史购买产品并分页
             用 ISNULL(), NVL(), IFNULL() and COALESCE() 函数替换空值
             在数据库操作中，往往要对一些查询出来的空值进行替换，如函数SUM(),这个函数如果没有值会返回NULL,这是我们不希望看到的，
                     在MySQL中我们可以这样来写：
                         select IFNULL(sum(data),0) ...
                     在SQLSERVER中我们可以这样写：
                         select ISNULL(sum(data),0) ...
                     在ORACLE中我们可以这样写：
                         select NVL(sum(data),0) ...
             对于所有数据库适用的方法可以这样写：
                     select COALESCE(sum(data),0) ...
         COALESCE()用法：
              COALESCE(value,...)
             返回第一个不是null的值，如果参数列表全是null,则返回null
                 SELECT COALESCE(NULL,1);
                     -> 1
                 SELECT COALESCE(NULL,NULL,NULL);
                 -> NULL
         -->
     <select id="selectHistoricalByUserIdByPageName" resultMap="BaseResultMap"
         parameterType="Map">

             select b.UserID,coalesce(a.FProductsBuyMoney,b.FProductsRateMoney) as FProductsBuyMoney,coalesce(a.m,0) as sumProfit,b.FProductsRateMoney,b.FPUID,b.FProductsName,b.FProductsImgs from
              ( select * from financeproducts_users where FProductsEm_k2 = 0 and userid =#{UserID}) b
             left join
                     (select userid,FProductsBuyMoney,FProductsRateEm_k1,sum(FProductsAsRateMoney) as m from financeproducts_rates
                     where userid =#{UserID}
                      group by FProductsRateEm_k1 ) a
                     on a.FProductsRateEm_k1=b.fpuid 

         <if test="startTime !=null">
             and DATE_FORMAT(b.FProductsBuyTime,'%Y-%m-%d')<![CDATA[>=]]>#{startTime}
         </if>
         <if test="productName !=null">
             and b.FProductsName like CONCAT('%', #{productName}, '%')
         </if>
     </select>

       <!-- insert -->
       <insert id="insertSelective" useGeneratedKeys="true" keyProperty="FPUID" parameterType="com.yhb.jsxn.entity.FinanceProductsUsers">
         insert into financeproducts_users
         <trim prefix="(" suffix=")" suffixOverrides=",">
             <if test="UserID != null">
                 UserID,
             </if>
             <if test="FPid != null">
                 FPid,
             </if>
         </trim>
         <trim prefix="values (" suffix=")" suffixOverrides=",">
             <if test="UserID != null">
                 #{UserID,jdbcType=VARCHAR},
             </if>
             <if test="FPid != null">
                 #{FPid,jdbcType=INTEGER},
             </if>
             <if test="FProductsName != null">
                 #{FProductsName,jdbcType=VARCHAR},
             </if>
         </trim>
     </insert>

     <!-- update 语句 -->
     <update id="updateByPrimaryKeySelective" parameterType="com.yhb.jsxn.entity.FinanceProductsUsers">
         update financeproducts_users
         <set>
             <if test="FProductsEm_k2 != null">
                 FProductsEm_k2=#{FProductsEm_k2,jdbcType=VARCHAR},
             </if>
             <if test="FProductsEm_k3 != null">
                 FProductsEm_k3=#{FProductsEm_k3,jdbcType=VARCHAR},
             </if>
         </set>
         where FPUID =#{FPUID,jdbcType=INTEGER}
     </update>

     <!-- del 语句 -->
 </mapper>

mybatis常用写法