Mybatis之@Select注解

Mybatis之@Select注解

@Select注解基本用法
@Select注解的目的是为了取代xml中的select标签，只作用于方法上面。
抛弃了传统的xml形式

例如（简单的sql）

public interface UserMapper {@Select("SELECT id, name, age FROM user WHERE id = #{userId}")User getUserById(int userId);
}

如果要想实现复杂的逻辑判断（比如if判断、for循环），则必须需要使用<script>标签，如下所示：
但是在<script> 和</script>内不能用>、<=、<、<=等判断语句要用gt;和lt;等转义字符，
具体字符自行百度查看。
以下使用的@Results是为了做出参的映射（xml形式里面也是有这个操作的）

//查询的例子
@Select({"<script>","SELECT T.*," +"        T2.HOLDER_TYPE," +"        T2.HOLDER_ID_TYPE," +"        T2.HOLDER_ID," +"        T2.HOLDER_NAME," +"        T2.LEGAL_REPRESENTATIVE," +"        T2.CONTACT_ID," +"        T2.CONTACT_NAME," +"        T2.CONTACT_PHONE" +"        FROM MATERIAL_INSTANCE T LEFT JOIN MATERIAL_HOLDER T2 ON (T.HOLDER_UNID=T2.UNID)" +"WHERE DELETE_FLAG = 'N'" +"<if test='unid != null and unid !=\"\" '>" +"and T.UNID=#{unid}" +"</if>" +"<if test='unids != null and unids !=\"\" '>" +"and T.UNID IN" +"<foreach collection='unids' item='unid' open='(' separator=',' close=')'> " +"'#{unid}'" +"</foreach>" +"</if>" +"<if test='materialName != null and materialName!=\"\" '>" +"and T.MATERIAL_NAME LIKE CONCAT('%',#{materialName},'%')" +"</if>" +"<if test='licenseNum != null and licenseNum!=\"\" '>" +"and T1.CONTACT_ID=#{licenseNum}" +"</if>" +"<if test='projId != null and projId !=\"\" '>" +"and T.PROJ_ID LIKE CONCAT('%',#{projId},'%')" +"</if>" +"<if test='bizFromSystem != null and bizFromSystem!=\"\" '>" +"and T.BIZ_FROM_SYSTEM=#{bizFromSystem}" +"</if>" +"<if test='catalogCode != null and catalogCode!=\"\" '>" +"and T.CATALOG_CODE LIKE CONCAT('%',#{catalogCode},'%')" +"</if>" +"<if test='materialUnid != null and materialUnid!=\"\" '>" +"and T.MATERIAL_UNID=#{materialUnid}" +"</if>" +"<if test='holderId != null and holderId!=\"\" '>" +"and T2.HOLDER_ID like CONCAT('%',#{holderId},'%')" +"</if>" +"<if test='level != null and level!=\"\" '>" +"and T.LEVEL=#{level}" +"</if>" +"<if test='labels != null and labels!=\"\" '>" +"and T.LABELS=#{labels}" +"</if>" +"<if test='holderName != null and holderName!=\"\" '>" +"and T2.HOLDER_NAME LIKE CONCAT('%',#{holderName},'%')" +"</if>" +"<if test='catalogName != null and catalogName!=\"\" '>" +"and T.CATALOG_NAME LIKE CONCAT('%',#{catalogName},'%')" +"</if>" +"ORDER BY T.CREATE_TIME DESC" +"<if test='limitStartNum != null'>" +"limit ${limitStartNum}, ${countPerPage}" +"</if>","</script>"})@Results({@Result(column = "UNID", property = "unid"),@Result(column = "HOLDER_UNID", property = "holderUnid"),@Result(column = "CATALOG_CODE", property = "catalogCode"),@Result(column = "CATALOG_NAME", property = "catalogName"),@Result(column = "PROJ_ID", property = "projId"),@Result(column = "SERVICE_UNID", property = "serviceUnid"),@Result(column = "SERVICE_CODE", property = "serviceCode"),@Result(column = "MATERIAL_SRC_TYPE", property = "materialSrcType"),@Result(column = "MATERIAL_NAME", property = "materialName"),@Result(column = "MATERIAL_TYPE", property = "materialType"),@Result(column = "VALID_TERM", property = "validTerm"),@Result(column = "FILE_UNID", property = "fileUnid"),@Result(column = "STATUS", property = "status"),@Result(column = "BIZ_FROM_SYSTEM_CODE", property = "bizFromSystemCode"),@Result(column = "BIZ_FROM_SYSTEM", property = "bizFromSystem"),@Result(column = "BIZ_AREA", property = "bizArea"),@Result(column = "RESOURCE_DIR_CODE", property = "resourceDirCode"),@Result(column = "APPLY_ROLE", property = "applyRole"),@Result(column = "REUSE_ENABLE_FLAG", property = "reuseEnableFlag"),@Result(column = "MATERIAL_UNID", property = "materialUnid"),@Result(column = "INSTANCE_MATERIAL_UNID", property = "instanceMaterialUnid"),@Result(column = "HOLDER_TYPE", property = "holderType"),@Result(column = "HOLDER_ID_TYPE", property = "holderIdType"),@Result(column = "HOLDER_ID", property = "holderId"),@Result(column = "HOLDER_NAME", property = "holderName"),@Result(column = "LEGAL_REPRESENTATIVE", property = "legalRepresentative"),@Result(column = "CONTACT_ID", property = "contactId"),@Result(column = "CONTACT_NAME", property = "contactName"),@Result(column = "CONTACT_PHONE", property = "contactPhone"),@Result(column = "LEVEL", property = "level"),@Result(column = "labels", property = "labels"),@Result(column = "CREATE_TIME", property = "createTime"),@Result(column = "RECEIVE_TIME", property = "receiveTime"),@Result(column = "SERVICE_NAME", property = "serviceName"),@Result(column = "MTC_SOURCE_ID", property = "mtcSourceId"),@Result(column = "MATERIAL_FORM", property = "materialForm"),@Result(column = "LABELS", property = "labels"),@Result(column = "EXPAND1", property = "expand1"),@Result(column = "EXPAND2", property = "expand2"),@Result(column = "EXPAND3", property = "expand3"),@Result(column = "EXPAND4", property = "expand4"),@Result(column = "EXPAND5", property = "expand5"),})List<MaterialInstanceCfgFoshanDO> queryForConfig(Map<String, Object> params);

//插入的例子
@Insert({"<script>","insert into material_instance (" +"          UNID," +"          HOLDER_UNID," +"          CATALOG_CODE," +"          CATALOG_NAME," +"          PROJ_ID," +"          SERVICE_UNID," +"          SERVICE_CODE," +"          MATERIAL_SRC_TYPE," +"          MATERIAL_NAME," +"          MATERIAL_TYPE," +"          VALID_TERM," +"          FILE_UNID," +"          STATUS," +"          BIZ_FROM_SYSTEM," +"          BIZ_AREA," +"          RESOURCE_DIR_CODE," +"          APPLY_ROLE," +"          REUSE_ENABLE_FLAG," +"          CREATE_TIME," +"          MATERIAL_UNID," +"        INSTANCE_MATERIAL_UNID," +"        MODIFY_TIME," +"        FINISH_DATE," +"        LEVEL," +"        FROM_FLAG," +"        RECEIVE_TIME," +"        SERVICE_NAME," +"        MTC_SOURCE_ID," +"        HOLDER_ID," +"        VERSION," +"        MATERIAL_FORM," +"        LABELS," +"  EXPAND1," +"  EXPAND2," +"  EXPAND3," +"  EXPAND4," +"  EXPAND5" +")" +"    values (" +"  #{params.unid,jdbcType=VARCHAR}," +"  #{params.holderUnid,jdbcType=VARCHAR}," +"  #{params.catalogCode,jdbcType=VARCHAR}," +"  #{params.catalogName,jdbcType=VARCHAR}," +"  #{params.projId,jdbcType=VARCHAR}," +"  #{params.serviceUnid,jdbcType=VARCHAR}," +"  #{params.serviceCode,jdbcType=VARCHAR}," +"  #{params.materialSrcType,jdbcType=VARCHAR}," +"  #{params.materialName,jdbcType=VARCHAR}," +"  #{params.materialType,jdbcType=CHAR}," +"  #{params.validTerm,jdbcType=INTEGER}," +"  #{params.fileUnid,jdbcType=LONGVARCHAR}," +"  #{params.status,jdbcType=CHAR}," +"  #{params.bizFromSystem,jdbcType=VARCHAR}," +"  #{params.bizArea,jdbcType=VARCHAR}," +"  #{params.resourceDirCode,jdbcType=VARCHAR}," +"  #{params.applyRole,jdbcType=CHAR}," +"  #{params.reuseEnableFlag,jdbcType=CHAR}," +"          #{params.createTime,jdbcType=VARCHAR}," +"          #{params.materialUnid,jdbcType=VARCHAR}," +"          #{params.instanceMaterialUnid,jdbcType=VARCHAR}," +"          #{params.modifyTime,jdbcType=VARCHAR}," +"          #{params.finishDate,jdbcType=VARCHAR}," +"          #{params.level,jdbcType=INTEGER}," +"          #{params.fromFlag,jdbcType=VARCHAR}," +"          #{params.receiveTime,jdbcType=VARCHAR}," +"          #{params.serviceName,jdbcType=VARCHAR}," +"          #{params.mtcSourceId,jdbcType=VARCHAR}," +"          #{params.holderId,jdbcType=VARCHAR}," +"          #{params.version,jdbcType=INTEGER}," +"          #{params.materialForm,jdbcType=VARCHAR}," +"          #{params.labels,jdbcType=VARCHAR}," +"          #{params.expand1,jdbcType=VARCHAR}," +"          #{params.expand2,jdbcType=VARCHAR}," +"          #{params.expand3,jdbcType=VARCHAR}," +"          #{params.expand4,jdbcType=VARCHAR}," +"          #{params.expand5,jdbcType=VARCHAR}" +"    )","</script>"})int insertInstance(@Param("params") MaterialInstanceFoshanDO params);

参考
【1】
https://blog.csdn.net/qq_23126581/article/details/127995866?utm_medium=distribute.pc_relevant.none-task-blog-2defaultbaidujs_baidulandingword~default-4-127995866-blog-106617681.235v39pc_relevant_yljh&spm=1001.2101.3001.4242.3&utm_relevant_index=7
【2】
https://blog.csdn.net/qq_34134299/article/details/117651500?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-117651500-blog-124945028.235%5Ev39%5Epc_relevant_yljh&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-117651500-blog-124945028.235%5Ev39%5Epc_relevant_yljh&utm_relevant_index=2

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