mybatis.xml中sql编写规范
一、越少的代碼，越強悍的功能，xml里面應該6個sql語句就夠用了，修改，維護成本很低，見下表?下載
| 英文名 | 方法名稱 | 核心點 | 建議 |
| insert | 1.新增數據 | 如果是自增主鍵，應該返回主鍵ID | |
| deleteById | 2. 根據主鍵ID刪除數據 | sql默認加limit 1，防止多刪數據 | 此方法不建議有，建議邏輯刪除 |
| updateById | 3. 根據主鍵ID修改數據 | sql默認加limit 1，防止多修改數據 | |
| selectById | 4. 根據主鍵查詢數據 | 查詢一條數據 | |
| selectByIdForUpdate | 5. 根據主鍵加鎖查詢數據 | 加鎖查詢一條數據，事務處理用 | |
| queryListByParam | 6. 根據輸入條件查詢數據列表 | 和7配合使用 | |
| queryCountByParam | 7. 根據輸入條件查詢總數 | 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 | 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 | 每個字段的等值判斷 | |
| _regin_where | 4. 通用范圍區間條件 | 字段的時間區間，字段的金額區間等的判斷 | |
| _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mybatis.xml例子??下載
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">??
??
??
????<!--?設置1分鐘緩存,緩存大小1024，采用最近最少使用算法?-->??
????<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>??
??
????<!--?字段列表?-->??
????<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>??
??
????<!--?字段值列表?-->??
????<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>??
??
????<!--?通用查詢條件??不支持ID查詢條件,ID的直接通過ID即可以查?-->??
????<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>??
??????
??????
????<!--?通用范圍區間查詢?-->??
????<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>??
??????
??????
????<!--?通用排序處理?-->??
????<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>??
??????
??????
????<!--?in?和?not?in的通用查詢where?-->??
????<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>??
??????
??????
????<!--?插入操作?-->??
????<insert?id="insert"?parameterType="Assets">??
????????INSERT?INTO?assets?(??
????????????<include?refid="_field_list"/>)??
????????VALUES?(??
????????????<include?refid="_value_list"/>)??
????</insert>??
??
??
????<!--?根據ID主鍵進行刪除，注意limit?1?-->??
????<delete?id="deleteById"??parameterType="java.lang.String"?>??
????????delete?from?assets?where?id?=?#{id}?limit?1??
????</delete>???
??
??
????<!--?根據主鍵ID進行更新，注意limit?1?-->??
????<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>??
??
??
????<!--?根據ID進行查詢?-->??
????<select?id="selectById"?resultMap="AssetsResultMap">??
????????select?*?from?assets?where?id?=?#{id}??
????</select>??
??????
??????
????<!--?根據ID進行加行鎖查詢?-->??
????<select?id="selectByIdForUpdate"?resultMap="AssetsResultMap">??
????????select?*?from?assets?where?id?=?#{id}?for?update??
????</select>??
??
??????
????<!--?根據查詢條件查詢數據和queryCountByParam方法配對使用?-->??
????<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>??
??????
??????
????<!--?根據查詢條件查詢總數和queryListByParam方法配對使用?-->??
????<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> ?
轉載于:https://blog.51cto.com/12186181/1863301
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