{"id":64,"date":"2019-01-10T13:00:46","date_gmt":"2019-01-10T05:00:46","guid":{"rendered":"http:\/\/www.anthonylee.cn\/myblog\/?p=64"},"modified":"2019-01-10T13:03:00","modified_gmt":"2019-01-10T05:03:00","slug":"%e8%81%94%e5%90%88%e4%b8%bb%e9%94%ae%e4%b8%8espring-jpa","status":"publish","type":"post","link":"http:\/\/www.anthonylee.cn\/myblog\/?p=64","title":{"rendered":"\u8054\u5408\u4e3b\u952e\u4e0eSpring jpa"},"content":{"rendered":"<p><strong>\u8054\u5408\u4e3b\u952e\uff1a<\/strong><\/p>\n<p>\u5c31\u662f\u75282\u4e2a\u62162\u4e2a\u4ee5\u4e0a\u7684\u5b57\u6bb5\u7ec4\u6210\u4e3b\u952e\u3002\u7528\u8fd9\u4e2a\u4e3b\u952e\u5305\u542b\u7684\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\uff0c\u8fd9\u4e2a\u7ec4\u5408\u5728\u6570\u636e\u8868\u4e2d\u662f\u552f\u4e00\uff0c\u4e14\u52a0\u4e86\u4e3b\u952e\u7d22\u5f15\u3002\u9002\u7528\u4e8e\u4f8b\u5982\u5173\u7cfb\u8868\u8fd9\u79cd\u591a\u5bf9\u591a\u7684\u573a\u666f\u3002<\/p>\n<p>\u8bed\u53e5\uff1a<span class=\"hljs-keyword\">alter<\/span> <span class=\"hljs-keyword\">table<\/span> \u8868\u540d <span class=\"hljs-keyword\">add<\/span> primary <span class=\"hljs-keyword\">key<\/span> (\u5b57\u6bb5<span class=\"hljs-number\">1<\/span>,\u5b57\u6bb5<span class=\"hljs-number\">2<\/span>,\u5b57\u6bb5<span class=\"hljs-number\">3<\/span>);<\/p>\n<p><strong>spring jpa \u5982\u4f55\u4f7f\u7528\u8054\u5408\u4e3b\u952e\uff1a<\/strong><\/p>\n<p>\u4f8b\u5b50\uff1aname\u548cidcardno\u5171\u540c\u7ec4\u6210\u4e86\u4e3b\u952e<\/p>\n<p><img src=\"https:\/\/images2017.cnblogs.com\/blog\/1153743\/201712\/1153743-20171216100756199-1802714125.png\" alt=\"\" \/>name\u00a0 \u00a0 idcardno\u00a0 \u00a0 age\u00a0 \u00a0 addresss<\/p>\n<p>\u5f20\u4e09\u00a0 \u00a0 12\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a03\u00a0 \u00a0 \u00a0 \u00a0 \u5730\u5740<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e00\u3001<span class=\"link_title\">Spring Data Jpa \u590d\u5408\u4e3b\u952e\u00a0<\/span><\/p>\n<p><span class=\"link_title\">1.1\u3001\u7f16\u5199\u4e00\u4e2a\u590d\u5408\u4e3b\u952e\u7c7b\uff1a<\/span>PeopleKey<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\n@Embeddable\r\npublic class PeopleKey implements Serializable  {\r\n     \r\n    @Column(name = &quot;name&quot;)\r\n    private String name;\r\n     \r\n    @Column(name = &quot;idcardno&quot;)\r\n    private String idcardno;\r\n    \/\/ \u7701\u7565setter,getter\u65b9\u6cd5\r\n \r\n    @Override\r\n    public String toString() {\r\n        return &quot;PeopleKey [name=&quot; + name + &quot;, idcardno=&quot; + idcardno + &quot;]&quot;;\r\n    }\r\n}\r\n<\/pre>\n<p>\u6ce8\u610f\uff1a<\/p>\n<p>1) \u5b9e\u73b0<code>Serializable<\/code>\u63a5\u53e3(\u5426\u5219\u4f1a\u62a5\u9519\uff0c\u9519\u8bef\u4f1a\u76f4\u63a5\u663e\u793a);<\/p>\n<p>2)\u5728\u590d\u5408\u4e3b\u952e\u7684\u7c7b\u4e0a\uff0c\u4f7f\u7528\u6ce8\u89e3@Embeddable<\/p>\n<p>3) \u6709\u9ed8\u8ba4\u7684public\u65e0\u53c2\u6570\u7684\u6784\u9020\u65b9\u6cd5\uff08\u5728\u6211\u8fd9\u4e2a\u5b9e\u4f8b\u4e2d\uff0c\u6211\u6ca1\u6709\u6dfb\u52a0\u6709\u53c2\u6784\u9020\u65b9\u6cd5\uff0c\u6240\u4ee5\u91c7\u7528\u9ed8\u8ba4\u7684\u6784\u9020\u65b9\u6cd5\uff09<\/p>\n<p>\u5982\u679c\u4f60\u5728\u5b9e\u4f53\u7c7b\u91cc\u6709\u6709\u53c2\u6784\u9020\u65b9\u6cd5\uff0c\u90a3\u4e48\u4e00\u5b9a\u8981\u6709\u4e00\u4e2a\u65e0\u53c2\u6784\u9020\u65b9\u6cd5\uff0c\u5426\u5219\u8fd0\u884c\u7684\u65f6\u5019\u4f1a\u62a5\u9519<\/p>\n<p><code class=\"java plain\">org.hibernate.InstantiationException: No\u00a0<\/code><code class=\"java keyword\">default<\/code>\u00a0<code class=\"java plain\">constructor\u00a0<\/code><code class=\"java keyword\">for<\/code>\u00a0<code class=\"java plain\">entity:\u00a0 : com.my.model.People<\/code><\/p>\n<p>\u8fd9\u4e2a\u5c31\u662f\u6ca1\u6709\u9ed8\u8ba4\u7684\u6784\u9020\u65b9\u6cd5\u9020\u6210\u7684\uff0c\u6240\u4ee5\u8981\u5728\u5b9e\u4f53\u7c7b\u4e2d\u52a0\u5165\u9ed8\u8ba4\u7684\u65e0\u53c2\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n<p>4) \u91cd\u5199<code>equals<\/code>\u548c<code>hashCode<\/code>\u65b9\u6cd5\u3002equals\u65b9\u6cd5\u7528\u4e8e\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u76f8\u540c\uff0cEntityManger\u901a\u8fc7find\u65b9\u6cd5\u6765\u67e5\u627eEntity\u65f6\uff0c\u662f\u6839\u636eequals\u7684\u8fd4\u56de\u503c\u6765\u5224\u65ad\u7684\u3002hashCode\u65b9\u6cd5\u8fd4\u56de\u5f53\u524d\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\uff08\u6211\u9a8c\u8bc1EntityManger\uff0c\u4e0d\u91cd\u5199\u4e5f\u6ca1\u4e8b\u3002\uff09\uff1b<\/p>\n<p><span class=\"link_title\">1.2\u3001\u7f16\u5199\u5b9e\u4f53\u7c7b\uff1a<\/span>People<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\npackage com.my.model;\r\n \r\nimport javax.persistence.*;\r\n@Entity\r\n@Table(name = &quot;people&quot;)\r\n\/\/@IdClass(PeopleKey.class)\r\npublic class People extends PeopleKey{\r\n\u3000\u3000\u3000\u3000\/\/ \u590d\u5408\u4e3b\u952e\u8981\u7528\u8fd9\u4e2a\u6ce8\u89e3\r\n    @EmbeddedId\r\n    private PeopleKey id;\r\n \r\n    @Column(name = &quot;age&quot;)\r\n    private int age;\r\n     \r\n    @Column(name = &quot;address&quot;)\r\n    private String address;\r\n \r\n    \/\/ \u7701\u7565setter,getter\u65b9\u6cd5\r\n    @Override\r\n    public String toString() {\r\n        return &quot;People [id=&quot; + id + &quot;, age=&quot; + age + &quot;, address=&quot; + address\r\n                + &quot;]&quot;;\r\n    }  \r\n}\r\n<\/pre>\n<p>\u8fd8\u53ef\u4ee5\u91c7\u7528@IdClass\u6765\u6ce8\u89e3\u590d\u5408\u4e3b\u952e \uff0c\u8fc7\u7a0b\u548c@Embeddable\u5dee\u4e0d\u591a\uff0c\u8fd9\u91cc\u76f4\u63a5\u8d34\u4f8b\u5b50\u3002<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\n\r\n@Entity\r\n@Table(name = &quot;people&quot;)\r\n@IdClass(PeopleKey.class)\r\npublic class People implements Serializable {\r\n\r\n\/\/ @EmbeddedId\r\n\/\/ private PeopleKey id;\r\n\r\n@Id\r\n@Column(name = &quot;name&quot;)\r\nprivate String name;\r\n@Id\r\n@Column(name = &quot;idcardno&quot;)\r\nprivate String idcardno;\r\n\r\n@Column(name = &quot;age&quot;)\r\nprivate int age;\r\n\r\n@Column(name = &quot;address&quot;)\r\nprivate String address;\r\n\r\n}\r\n\r\n<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8054\u5408\u4e3b\u952e\uff1a \u5c31\u662f\u75282\u4e2a\u62162\u4e2a\u4ee5\u4e0a\u7684\u5b57\u6bb5\u7ec4\u6210\u4e3b\u952e\u3002\u7528\u8fd9\u4e2a\u4e3b\u952e\u5305\u542b\u7684\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\uff0c\u8fd9\u4e2a\u7ec4\u5408\u5728\u6570\u636e\u8868\u4e2d\u662f\u552f&hellip; <a href=\"http:\/\/www.anthonylee.cn\/myblog\/?p=64\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">\u8054\u5408\u4e3b\u952e\u4e0eSpring jpa<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts\/64"}],"collection":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=64"}],"version-history":[{"count":8,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts\/64\/revisions"}],"predecessor-version":[{"id":72,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts\/64\/revisions\/72"}],"wp:attachment":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=64"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=64"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}