{"id":1129,"date":"2019-01-31T14:18:43","date_gmt":"2019-01-31T06:18:43","guid":{"rendered":"http:\/\/van-yzt.com\/?p=1129"},"modified":"2019-01-31T14:18:43","modified_gmt":"2019-01-31T06:18:43","slug":"result-map","status":"publish","type":"post","link":"https:\/\/huzi-baozi.com\/?p=1129","title":{"rendered":"Result Map"},"content":{"rendered":"

constructor<\/h2>\n
    <resultMap id="UserBasic" type="com.alibaba.force.dal.model.capsulation.UserBasic">\n        <constructor>\n            <arg column="u_name" jdbcType="VARCHAR" javaType="java.lang.String"\/>\n            <arg column="u_username" jdbcType="VARCHAR" javaType="java.lang.String"\/>\n            <arg column="u_id" jdbcType="BIGINT" javaType="java.lang.Long"\/>\n            <arg column="u_state" jdbcType="VARCHAR" javaType="java.lang.String"\/>\n            <arg column="u_avatar" jdbcType="VARCHAR" javaType="java.lang.String"\/>\n            <arg column="u_extern_uid" jdbcType="VARCHAR" javaType="java.lang.String"\/>\n        <\/constructor>\n    <\/resultMap>\n\n<\/code><\/pre>\n
@ToString\n@Getter\n@Setter\npublic class UserBasic extends UserSafe {\n    private Long id;\n\n    private String state;\n\n    @JSONField(name = "avatar_url")\n    private String avatarUrl;\n\n    @JSONField(name = "extern_uid")\n    private String externUid;\n\n    \/**\n     * @param name\n     * @param username\n     * @param id\n     * @param state\n     * @param avatar    \u6ce8\u610f\uff0c\u8fd9\u91cc\u9700\u8981\u505a\u4e00\u4e9b\u989d\u5916\u64cd\u4f5c\n     * @param externUid\n     *\/\n    public UserBasic(String name, String username, Long id, String state, String avatar, String externUid) {\n        super(name, username);\n        this.id = id;\n        this.state = state;\n        this.externUid = externUid;\n        this.setAvatarUrl(UsersUtil.getAvatarUrl(UsersBuilder.newBuilder().setId(id).setAvatar(avatar)\n            .setExternUid(externUid).build()));\n    }\n\n    public UserBasic() {\n    }\n\n    @Override\n    public UserBasic merge(@NonNull Users users) {\n        super.merge(users);\n        this.setId(users.getId());\n        this.setState(users.getState());\n        this.setAvatarUrl(UsersUtil.getAvatarUrl(users));\n        this.setExternUid(users.getExternUid());\n        return this;\n    }\n}\n<\/code><\/pre>\n
\u6ce8\u610f\u5165\u53c2\u7684\u987a\u5e8f\u4fdd\u6301\u4e00\u81f4<\/strong><\/p>\n
\nassociation<\/h2>\n
association<\/code>\u5b57\u6bb5\u53ef\u4ee5\u76f4\u63a5\u589e\u52a0ResultMap<\/code>\u7684\u5b50\u5c5e\u6027\u3002<\/p>\n
    <resultMap id="MigrateTaskRecordDO" type="com.alibaba.force.dal.model.capsulation.MigrateTaskRecordDO">\u2028  <id column="id" jdbcType="BIGINT" property="id" \/>\u2028  <id column="u_id"\/>\u2028  <result column="gmt_create" jdbcType="TIMESTAMP" property="gmtCreate" \/>\u2028  <result column="gmt_modified" jdbcType="TIMESTAMP" property="gmtModified" \/>\u2028  <association property="creator" javaType**="com.alibaba.force.dal.model.capsulation.UserBasic"    resultMap="UserBasic"\/>\u2028<\/resultMap>\n<\/code><\/pre>\n
association<\/code>\u4e2d\u7684resultMap<\/code>\u6240\u6307\u5411\u7684\u5b57\u6bb5\u4e5f\u5fc5\u987b\u662f\u7533\u660e\u8fc7\u7684ResultMap<\/code>\u5bf9\u8c61\u3002
\nresult<\/code>\u9700\u8981\u653e\u7f6e\u5728association<\/code>\u4e4b\u524d\u3002<\/p>\n
\nN+1\u95ee\u9898<\/h3>\n
\u6ce8\u610f\u4e0a\u9762\u4f8b\u5b50\u4e2d\u7684\u591a\u4e2a\u6807\u7b7e<\/strong><\/p>\n
\u6709\u8fd9\u4e48\u4e00\u4e2a\u573a\u666f\uff0c\u4f1a\u4ea7\u751f\u5751\uff1a
\n\u5f53\u67e5\u8be21\u5bf9\u591a\u7684\u5173\u7cfb\u65f6\uff0c\u5982\u679c\u91c7\u7528\u4e86\u5d4c\u5957\u7684\u65b9\u5f0f\uff08association\u3001collection\uff09\uff0c\u5219MyBatis\u4f1a\u5728DefaultResultSetHandler<\/code>\u4e2d\u8c03\u7528handleRowValuesForNestedResultMap<\/code>
\n\u65b9\u6cd5\u3002
\n\u8be5\u65b9\u6cd5\u91c7\u7528\u4e86\u8ba1\u7b97key(createRowKey<\/code>)\u7684\u65b9\u5f0f\u6765\u8bb0\u5f55\u5df2\u7ecf\u904d\u5386\u8fc7\u7684\u5bf9\u8c61\uff0c\u5e76\u4e14\u4e0b\u6b21\u4ece\u7f13\u5b58\u4e2d\u62ff\uff08\u51cf\u5c11\u5185\u5b58\u7684\u6d88\u8017\uff0c\u5171\u4eab\u5d4c\u5957\u7684\u91cd\u590d\u5bf9\u8c61\uff09\u3002<\/p>\n
\u800c\u7531\u4e8eN+1\u7684select\u4e00\u5b9a\u662f\u6839\u636e\u8fd9\u4e2a\u201c1\u201d\u53bb\u67e5\u8be2\u5176\u4ed6\u7684\u201cN\u201d\u7684\uff0c\u5982\u679c\u6b64\u65f6<id><\/code>\u4e0d\u53d8\uff0c\u4e3a\u4e3b\u952e\uff0c\u90a3\u4e48\u5c31\u4f1a\u88ab\u4e22\u5f03\u5f88\u591a\u7ed3\u679c\uff08\u7406\u8bba\u4e0a\u4e0d\u91cd\u590d\uff0c\u4f46\u662f\u7531\u4e8e\u4e0a\u8ff0\u7684\u8ba1\u7b97\u89c4\u5219\uff0c\u88abMyBatis\u8ba4\u4e3a\u662f\u91cd\u590d\uff09\u3002\u56e0\u6b64\uff0c\u4f7f\u7528\u591a\u4e2a\u8054\u5408\u5b57\u6bb5\u4f5c\u4e3aid\u662f\u6700\u68d2\u7684\u89e3\u3002\u8fd9\u4e9b\u8054\u5408ID\u9700\u8981\u662f\u6700\u7ec8\u786e\u5b9a\u4e00\u4e2a\u4e0d\u91cd\u590d\u5bf9\u8c61\u7684\u552f\u4e00\u503c\u3002<\/p>\n
MyBatis\u7248\u672c\uff1a3.4.4<\/p>\n","protected":false},"excerpt":{"rendered":"
constructor <resultMap id="UserBasic" type="com.alibaba.force.dal.model.capsulation.UserBasic"> <constructor> <arg column="u_name" jdbcType="VARCHAR" javaType="java.lang.String"\/> <arg column="u_username" jdbcType="VARCHAR" javaType="java.lang.String"\/> <arg column="u_id" jdbcType="BIGINT" javaType="java.lang.Long"\/> <arg column="u_state" jdbcType="VARCHAR" javaType="java.lang.String"\/> <arg column="u_avatar" jdbcType="VARCHAR" javaType="java.lang.String"\/> <arg column="u_extern_uid" jdbcType="VARCHAR" javaType="java.lang.String"\/> <\/constructor> <\/resultMap> @ToString @Getter @Setter public class UserBasic extends UserSafe { private Long id; private String state; @JSONField(name = "avatar_url") private String avatarUrl; @JSONField(name = "extern_uid") … <\/p>\n
Continue reading “Result Map”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-1129","post","type-post","status-publish","format-standard","hentry","category-snippet"],"_links":{"self":[{"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=\/wp\/v2\/posts\/1129","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1129"}],"version-history":[{"count":1,"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=\/wp\/v2\/posts\/1129\/revisions"}],"predecessor-version":[{"id":1130,"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=\/wp\/v2\/posts\/1129\/revisions\/1130"}],"wp:attachment":[{"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huzi-baozi.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}