部分xml代码优化

Demo.xml

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+<?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.steerinfo.dil.logresult.mapper.LogResultMapper">
+  <resultMap id="BaseResultMap" type="com.steerinfo.dil.logresult.model.LogResult">
+    <id column="LOG_ID" jdbcType="DECIMAL" property="logId" />
+    <result column="LOG_CONTENT" jdbcType="VARCHAR" property="logContent" />
+    <result column="FOREIGN_KEY_ID" jdbcType="DECIMAL" property="foreignKeyId" />
+    <result column="FOREIGN_KEY_TYPE" jdbcType="VARCHAR" property="foreignKeyType" />
+    <result column="METHOD_NAME" jdbcType="VARCHAR" property="methodName" />
+    <result column="METHOD_DESCRIPTION" jdbcType="VARCHAR" property="methodDescription" />
+    <result column="EXE_COST" jdbcType="DECIMAL" property="exeCost" />
+    <result column="FILE_PATH" jdbcType="VARCHAR" property="filePath" />
+    <result column="INSERT_TIME" jdbcType="TIMESTAMP" property="insertTime" />
+    <result column="INSERT_USERNAME" jdbcType="VARCHAR" property="insertUsername" />
+    <result column="REMARK" jdbcType="VARCHAR" property="remark" />
+    <result column="DATAGRAM1" jdbcType="VARCHAR" property="datagram1" />
+    <result column="DATAGRAM2" jdbcType="VARCHAR" property="datagram2" />
+    <result column="DATAGRAM3" jdbcType="VARCHAR" property="datagram3" />
+    <result column="ALTERNATE_FIELDS1" jdbcType="VARCHAR" property="alternateFields1" />
+    <result column="ALTERNATE_FIELDS2" jdbcType="VARCHAR" property="alternateFields2" />
+    <result column="ALTERNATE_FIELDS3" jdbcType="VARCHAR" property="alternateFields3" />
+    <result column="ALTERNATE_FIELDS4" jdbcType="VARCHAR" property="alternateFields4" />
+    <result column="ALTERNATE_FIELDS5" jdbcType="VARCHAR" property="alternateFields5" />
+    <result column="ALTERNATE_FIELDS6" jdbcType="VARCHAR" property="alternateFields6" />
+    <result column="ALTERNATE_FIELDS7" jdbcType="VARCHAR" property="alternateFields7" />
+    <result column="ALTERNATE_FIELDS8" jdbcType="VARCHAR" property="alternateFields8" />
+    <result column="ALTERNATE_FIELDS9" jdbcType="VARCHAR" property="alternateFields9" />
+    <result column="ALTERNATE_FIELDS10" jdbcType="VARCHAR" property="alternateFields10" />
+    <result column="ALTERNATE_FIELDS11" jdbcType="VARCHAR" property="alternateFields11" />
+    <result column="ALTERNATE_FIELDS12" jdbcType="VARCHAR" property="alternateFields12" />
+    <result column="ALTERNATE_FIELDS13" jdbcType="VARCHAR" property="alternateFields13" />
+    <result column="ALTERNATE_FIELDS14" jdbcType="VARCHAR" property="alternateFields14" />
+    <result column="ALTERNATE_FIELDS15" jdbcType="VARCHAR" property="alternateFields15" />
+    <result column="ALTERNATE_FIELDS16" jdbcType="VARCHAR" property="alternateFields16" />
+  </resultMap>
+  <sql id="columns">
+    LOG_ID,LOG_CONTENT,FOREIGN_KEY_ID,FOREIGN_KEY_TYPE
+  </sql>
+  <sql id="select">
+    select <include refid="columns"/> from log_result
+  </sql>
+<!--  1.定义重复的字段列表，维护成本高，通过复用基础字段来简化-->
+  <sql id="aliasColumns">
+    <foreach collection="columns.split(',')" item="col" separator=",">
+      t.${col.trim()}
+    </foreach>
+  </sql>
+
+  <sql id="select_alias">
+    select <include refid="aliasColumns"> from log_result t</include>
+  </sql>
+  <sql id="where">
+    <where>
+      <if test="logId !=null">
+        and LOG_ID=#{logId}
+      </if>
+      <if test="logContent !=null and logContent !=''">
+        and LOG_CONTENT=#{logContent}
+      </if>
+      <if test="foreignKeyType !=null and foreignKeyType !=''">
+        and FOREIGN_KEY_TYPE=#{foreignKeyType}
+      </if>
+--       2.重复字段的硬编译，用循环来优化
+      <if test="alternateFeilds !=null and alternateFeilds.size()>0">
+        <foreach collection="alternateFeilds" item="field" index="index">
+          <if test="field !=null and field !=''">
+            and ALTERNATE_FIELDS${index +1}=#{field}
+          </if>
+        </foreach>
+      </if>
+    </where>
+  </sql>
+  <sql id="whereLike">
+    <where>
+      <if test="logId !=null">
+        and LOG_ID=#{logId}
+      </if>
+      <if test="logContent !=null and logContent !=''">
+--       3.直接拼接会存在SQL注入的风险
+        and LOG_CONTENT like concat('%',#{logContent},'%')
+      </if>
+      <if test="foreignKeyId !=null">
+        and FOREIGN_KEY_ID=#{foreignKeyId}
+      </if>
+      <if test="foreignKeyType !=null and foreignKeyType !=''">
+        and FOREIGN_KEY_TYPE like concat('%','foreignKeyType','%')
+      </if>
+      <if test="insertTime !=null">
+        and TO_CHAR(INSERT_TIME,'yyyy-mm-dd')=#{insertTime}
+      </if>
+      <if test="datagram !=null and datagram !=''">
+        <foreach collection="datagram" item="field" index="index">
+          <if test="field !=null and field !=''">
+            and DATAGRAM${index+1} like concat('%','field','%')
+          </if>
+        </foreach>
+      </if>
+      <if test="alternateFields !=null and alternateFields !=''">
+        <foreach collection="alternateFields" item="field" index="index">
+          <if test="field !=null and field !=''">
+            and ALTERNATE_FIELDS${index+1} like concat('%','field','%')
+          </if>
+        </foreach>
+      </if>
+    </where>
+  </sql>
+  <delete id="deleteByPrimaryKey" parameterType="java.math.BigDecimal">
+    delete from LOG_RESULT
+    where LOG_ID=#{logId,jdbcType=DECIMAL}
+  </delete>
+  <delete id="delete" parameterType="HashMap">
+    delete from LOG_RESULT
+    where 1!=1
+     <if test="logContent !=null and logContent !=''">
+       or LOG_CONTENT=#{logContent}
+     </if>
+     <if test="datagram !=null and datagram !=''">
+       <foreach collection="datagram" index="index" item="field">
+         <if test="field !=null and field !=''">
+           or DATAGRAM${index+1} =#{field}
+         </if>
+       </foreach>
+     </if>
+  </delete>
+  <insert id="insert" parameterType="LogResult">
+    insert into LOG_RESULT(LOG_ID,LOG_CONTENT,FOREIGN_KEY_ID,FOREIGN_KEY_TYPE)
+    values(#{logId},#{logContent},#{foreignKeyId},#{foreignKeyType}})
+  </insert>
+  <insert id="insert2" parameterType="LogResult">
+    insert into LOG_RESULT
+    <trim prefix="(" suffix=")" suffixOverrides=",">
+      <if test="logId !=null"> LOG_ID,</if>
+      <if test="logContent !=null"> LOG_CONTENT,</if>
+      <if test="foreignKeyId !=null"> FOREIGN_KEY_ID,</if>
+      <if test="foreignKeyType !=null"> FOREIGN_KEY_TYPE,</if>
+      <if test="alternateFields !=null">
+      <foreach collection="alternateFields" item="field" index="index">
+        ALTERNATE_FIELDS${index+1},
+      </foreach>
+      </if>
+    </trim>
+    <trim prefix="values (" suffix=")" suffixOverrides=",">
+      <if test="logId !=null">#{logId}</if>
+      <if test="logContent !=null">#{logContent}</if>
+      <if test="foreignKeyId !=null">#{foreignKeyId}</if>
+      <if test="foreignKeyType !=null">#{foreignKeyType}</if>
+      <if test="alternateFields !=null">
+        <foreach collection="alternateFields" index="index" item="field">
+          <if test="field !=null">
+            #{field}
+          </if>
+        </foreach>
+      </if>
+    </trim>
+  </insert>
+  <update id="update" parameterType="LogResult">
+    update LOG_RESULT
+    set LOG_CONTENT=#{logContent},
+        FOREIGN_KEY_ID=#{foeignKeyId},
+        FOREIGN_KEY_TYPE= #{foreignKeyType}
+    where LOG_ID=#{logId}
+  </update>
+  <update id="update2" parameterType="LogResult">
+    update LOG_RESULT
+    <set>
+      <if test="logContent !=null">
+        LOG_CONTENT=#{logContent}
+      </if>
+      <if test="foreignKeyId !=null">
+        FOREIGN_KEY_ID= #{foreignKeyId}
+      </if>
+      <if test="foreignKeyType !=null">
+        FOREIGN_KEY_TYPE= #{foreignKeyType}
+      </if>
+      <if test="alternateFields !=null">
+        <foreach collection="alternateFields" index="index" item="field">
+          <if test="field !=null">
+            ALTERNATE_FIELDS${index+1}=#{field}
+          </if>
+        </foreach>
+      </if>
+    </set>
+where LOG_ID = #{logId}
+  </update>
+<!--  4.分页查询添加分页查询支持-->
+  <select id="selectByParameters" parameterType="HashMap" resultType="BaseResultMap">
+    <include refid="select"></include>
+    <include refid="where"></include>
+limit #{offset} , #{pageSize}
+  </select>
+  <delete id="batchDel" parameterType="List">
+    delete from LOG_RESULT
+    where LOG_ID in
+    <foreach collection="list" item="id" open="(" close=")" separator=",">
+      #{id}
+    </foreach>
+  </delete>
+  
+</mapper>