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一、越少的代碼，越強(qiáng)悍的功能，xml里面應(yīng)該6個(gè)sql語(yǔ)句就夠用了，修改，維護(hù)成本很低，見(jiàn)下表

英文名	方法名稱	核心點(diǎn)	建議
insert	1.新增數(shù)據(jù)	如果是自增主鍵，應(yīng)該返回主鍵ID
deleteById	2. 根據(jù)主鍵ID刪除數(shù)據(jù)	sql默認(rèn)加limit 1，防止多刪數(shù)據(jù)	此方法不建議有，建議邏輯刪除
updateById	3. 根據(jù)主鍵ID修改數(shù)據(jù)	sql默認(rèn)加limit 1，防止多修改數(shù)據(jù)
selectById	4. 根據(jù)主鍵查詢數(shù)據(jù)	查詢一條數(shù)據(jù)
selectByIdForUpdate	5. 根據(jù)主鍵加鎖查詢數(shù)據(jù)	加鎖查詢一條數(shù)據(jù)，事務(wù)處理用
queryListByParam	6. 根據(jù)輸入條件查詢數(shù)據(jù)列表	和7配合使用
queryCountByParam	7. 根據(jù)輸入條件查詢總數(shù)	和6配合使用

二、公共的查詢條件和字段列表等抽出公共sql段，方便使用

英文名	方法名稱	核心點(diǎn)	建議
_field_list	1.字段列表	修改方便，方便字段排序
_value_list	2. 字段值列表	修改方便，方便字段值排序
_common_where	3. 通用查詢條件	每個(gè)字段的等值判斷
_regin_where	4. 通用范圍區(qū)間條件	字段的時(shí)間區(qū)間，字段的金額區(qū)間等的判斷
_contain_where	5. 包含字段值范圍條件	字段的常量值包含判斷，in ，not in
_common_sorts	6. 通用排序條件	order by

三、一個(gè)mybatis.xml例子

Sql代碼

<?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="Assets">
<cache readOnly="true" flushInterval="60000" size="10" eviction="LRU" />
<resultMap type="Assets" id="AssetsResultMap">
<id property="id" column="id" />
<result property="userId" column="user_id" />
<result property="amount" column="amount" />
<result property="earning" column="earning" />
<result property="type" column="type" />
<result property="status" column="status" />
<result property="productId" column="product_id" />
<result property="productName" column="product_name" />
<result property="cardNo" column="card_no" />
<result property="bankCode" column="bank_code" />
<result property="orderId" column="order_id" />
<result property="effectiveDate" column="effective_date" />
<result property="redeemType" column="redeem_type"/>
<result property="initAmount" column="init_amount"/>
<result property="initEarning" column="init_earning"/>
<result property="redeemingAmount" column="redeeming_amount"/>
<result property="redeemingEarning" column="redeeming_earning"/>
<result property="redeemedAmount" column="redeemed_amount"/>
<result property="redeemedEarning" column="redeemed_earning"/>
<result property="punishAmount" column="punish_amount"/>
<result property="latestRedeemTime" column="latest_redeem_time"/>
<result property="maturityDate" column="maturity_date"/>
<result property="createTime" column="create_time" />
<result property="modifyTime" column="modify_time" />
<result property="remark" column="remark" />
</resultMap>
<sql id="_field_list">
id,
user_id,
amount,
earning,
type,
status,
product_id,
product_name,
card_no,
bank_code,
order_id,
effective_date,
redeem_type,
init_amount,
init_earning,
redeeming_amount,
redeeming_earning,
redeemed_amount,
redeemed_earning,
punish_amount,
latest_redeem_time,
maturity_date,
create_time,
modify_time,
remark
</sql>
<sql id="_value_list">
#{id},
#{userId},
#{amount},
#{earning},
#{type},
#{status},
#{productId},
#{productName},
#{cardNo},
#{bankCode},
#{orderId},
#{effectiveDate},
#{redeemType},
#{initAmount},
#{initEarning},
#{redeemingAmount},
#{redeemingEarning},
#{redeemedAmount},
#{redeemedEarning},
#{punishAmount},
#{latestRedeemTime},
#{maturityDate},
#{createTime},
#{modifyTime},
#{remark}
</sql>
<sql id="_common_where">
<if test="id != null"> AND id = #{id}</if>
<if test="userId != null"> AND user_id = #{userId}</if>
<if test="amount != null"> AND amount = #{amount}</if>
<if test="earning != null"> AND earning = #{earning}</if>
<if test="type != null"> AND type = #{type}</if>
<if test="status != null"> AND status = #{status}</if>
<if test="productId != null"> AND product_id = #{productId}</if>
<if test="productName != null"> AND product_name = #{productName}</if>
<if test="cardNo != null"> AND card_no = #{cardNo}</if>
<if test="bankCode != null"> AND bank_code = #{bankCode}</if>
<if test="orderId != null"> AND order_id = #{orderId}</if>
<if test="effectiveDate != null"> AND effective_date = #{effectiveDate}</if>
<if test="redeemType != null"> AND redeem_type = #{redeemType}</if>
<if test="initAmount != null"> AND init_amount = #{initAmount}</if>
<if test="initEarning != null"> AND init_earning = #{initEarning}</if>
<if test="redeemingAmount != null"> AND redeeming_amount = #{redeemingAmount}</if>
<if test="redeemingEarning != null"> AND redeeming_earning = #{redeemingEarning}</if>
<if test="redeemedAmount != null"> AND redeemed_amount = #{redeemedAmount}</if>
<if test="redeemedEarning != null"> AND redeemed_earning = #{redeemedEarning}</if>
<if test="punishAmount != null"> AND punish_amount = #{punishAmount}</if>
<if test="latestRedeemTime != null">
<![CDATA[
AND latest_redeem_time = #{latestRedeemTime, jdbcType=TIMESTAMP}
]]>
</if>
<if test="maturityDate != null">
<![CDATA[
AND maturity_date = #{maturityDate, jdbcType=TIMESTAMP}
]]>
</if>
<if test="createTime != null">
<![CDATA[
AND create_time = #{createTime, jdbcType=TIMESTAMP}
]]>
</if>
<if test="modifyTime != null">
<![CDATA[
AND modify_time = #{modifyTime, jdbcType=TIMESTAMP}
]]>
</if>
<if test="remark != null"> AND remark = #{remark}</if>
</sql>
<sql id="_regin_where">
<if test="egtCreateTime != null">
<![CDATA[
AND create_time >= #{egtCreateTime, jdbcType=TIMESTAMP}
]]>
</if>
<if test="ltCreateTime != null">
<![CDATA[
AND create_time < #{ltCreateTime, jdbcType=TIMESTAMP}
]]>
</if>
</sql>
<sql id="_common_sorts">
<if test="sorts != null">
ORDER BY
<foreach collection="sorts" item="item" separator=",">
${item.column.columnName} ${item.sortMode.mode}
</foreach>
</if>
</sql>
<sql id="_contain_where">
<if test="containStatusSet!=null">
AND status IN
<foreach item="item" index="i" collection="containStatusSet" separator="," open="(" close=")" >
#{item}
</foreach>
</if>
</sql>
<insert id="insert" parameterType="Assets">
INSERT INTO assets (
<include refid="_field_list"/>)
VALUES (
<include refid="_value_list"/>)
</insert>
<delete id="deleteById" parameterType="java.lang.String" >
delete from assets where id = #{id} limit 1
</delete>
<update id="updateById" parameterType="Assets">
UPDATE assets
<set>
<if test="userId != null">
user_id = #{userId},
</if>
<if test="amount != null">
amount = #{amount},
</if>
<if test="earning != null">
earning = #{earning},
</if>
<if test="type != null">
type = #{type},
</if>
<if test="status != null">
status = #{status},
</if>
<if test="productName != null">
product_name = #{productName},
</if>
<if test="productId != null">
product_id = #{productId},
</if>
<if test="cardNo != null">
card_no = #{cardNo},
</if>
<if test="bankCode != null">
bank_code = #{bankCode},
</if>
<if test="orderId != null">
order_id = #{orderId},
</if>
<if test="effectiveDate != null">
effective_date = #{effectiveDate},
</if>
<if test="redeemType != null">
redeem_type = #{redeemType},
</if>
<if test="initAmount != null">
init_amount = #{initAmount},
</if>
<if test="initEarning != null">
init_earning = #{initEarning},
</if>
<if test="redeemingAmount != null">
redeeming_amount = #{redeemingAmount},
</if>
<if test="redeemingEarning != null">
redeeming_earning = #{redeemingEarning},
</if>
<if test="redeemedAmount != null">
redeemed_amount = #{redeemedAmount},
</if>
<if test="redeemedEarning != null">
redeemed_earning = #{redeemedEarning},
</if>
<if test="punishAmount != null">
punish_amount = #{punishAmount},
</if>
<if test="latestRedeemTime != null">
latest_redeem_time = #{latestRedeemTime},
</if>
<if test="maturityDate != null">
maturity_date = #{maturityDate},
</if>
<if test="modifyTime != null">
modify_time = #{modifyTime},
</if>
<if test="remark != null">
remark = #{remark},
</if>
</set>
<where>
id = #{id} limit 1
</where>
</update>
<select id="selectById" resultMap="AssetsResultMap">
select * from assets where id = #{id}
</select>
<select id="selectByIdForUpdate" resultMap="AssetsResultMap">
select * from assets where id = #{id} for update
</select>
<select id="queryListByParam" parameterType="map" resultMap="AssetsResultMap">
SELECT
<include refid="_field_list"/>
FROM
assets
<where>
1 = 1
<include refid="_common_where"/>
<include refid="_regin_where"/>
<include refid="_contain_where"/>
</where>
<include refid="_common_sorts"/>
<if test="offset != null and rows != null">
limit #{offset}, #{rows}
</if>
</select>
<select id="queryCountByParam" parameterType="map" resultType="java.lang.Integer">
SELECT count(1) FROM assets
<where>
1 = 1
<include refid="_common_where"/>
<include refid="_regin_where"/>
<include refid="_contain_where"/>
</where>
</select>
</mapper>

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