{"id":414,"date":"2020-12-06T01:19:14","date_gmt":"2020-12-05T17:19:14","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=414"},"modified":"2020-12-10T14:23:36","modified_gmt":"2020-12-10T06:23:36","slug":"mybatis-plus%e5%ad%a6%e4%b9%a0%ef%bc%88%e5%85%ad%ef%bc%89-mybatiplus%e7%9a%84%e4%b9%90%e8%a7%82%e9%94%81%e5%92%8c%e8%87%aa%e5%8a%a8%e5%a1%ab%e5%85%85%e5%8a%9f%e8%83%bd%e8%af%a6","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/mybatis\/414.html","title":{"rendered":"Mybatis-plus\u5b66\u4e60\uff08\u516d\uff09\u2014\u2014MybatiPlus\u7684\u4e50\u89c2\u9501\u548c\u81ea\u52a8\u586b\u5145\u529f\u80fd\u8be6\u89e3"},"content":{"rendered":"\n<h2>7.\u4e50\u89c2\u9501<\/h2>\n\n\n\n<h3>7.1OptimisticLockerInnerInterceptor<\/h3>\n\n\n\n<p>\u5f53\u8981\u66f4\u65b0\u4e00\u6761\u8bb0\u5f55\u7684\u65f6\u5019\uff0c\u5e0c\u671b\u8fd9\u6761\u8bb0\u5f55\u6ca1\u6709\u88ab\u522b\u4eba\u66f4\u65b0<br>\u4e50\u89c2\u9501\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<ul><li>\u53d6\u51fa\u8bb0\u5f55\u65f6\uff0c\u83b7\u53d6\u5f53\u524dversion<\/li><li>\u66f4\u65b0\u65f6\uff0c\u5e26\u4e0a\u8fd9\u4e2aversion<\/li><li>\u6267\u884c\u66f4\u65b0\u65f6\uff0c set version = newVersion where version = oldVersion<\/li><li>\u5982\u679cversion\u4e0d\u5bf9\uff0c\u5c31\u66f4\u65b0\u5931\u8d25<\/li><\/ul>\n\n\n\n<h3>7.2\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u5b57\u6bb5\u4e0a\u52a0\u4e0a<code>@Version<\/code>\u6ce8\u89e3<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Version\nprivate Integer version;<\/code><\/pre>\n\n\n\n<p>\u8bf4\u660e:<\/p>\n\n\n\n<ul><li><strong>\u652f\u6301\u7684\u6570\u636e\u7c7b\u578b\u53ea\u6709:int,Integer,long,Long,Date,Timestamp,LocalDateTime<\/strong><\/li><li>\u6574\u6570\u7c7b\u578b\u4e0b <code>newVersion = oldVersion + 1<\/code><\/li><li><code>newVersion<\/code> \u4f1a\u56de\u5199\u5230 <code>entity<\/code> \u4e2d<\/li><li>\u4ec5\u652f\u6301 <code>updateById(id)<\/code> \u4e0e <code>update(entity, wrapper)<\/code> \u65b9\u6cd5<\/li><li><strong>\u5728 <code>update(entity, wrapper)<\/code> \u65b9\u6cd5\u4e0b, <code>wrapper<\/code> \u4e0d\u80fd\u590d\u7528!!!<\/strong><\/li><\/ul>\n\n\n\n<h2>8.\u81ea\u52a8\u586b\u5145\u529f\u80fd<\/h2>\n\n\n\n<h3>8.1\u539f\u7406<\/h3>\n\n\n\n<p>\u2460\u5b9e\u73b0\u5143\u5bf9\u8c61\u5904\u7406\u5668\u63a5\u53e3\uff1acom.baomidou.mybatisplus.core.handlers.MetaObjectHandler<\/p>\n\n\n\n<p>\u2461\u6ce8\u89e3\u586b\u5145\u5b57\u6bb5 <code>@TableField(.. fill = FieldFill.INSERT)<\/code> \u751f\u6210\u5668\u7b56\u7565\u90e8\u5206\u4e5f\u53ef\u4ee5\u914d\u7f6e\uff01<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class User {\n\n    \/\/ \u6ce8\u610f\uff01\u8fd9\u91cc\u9700\u8981\u6807\u8bb0\u4e3a\u586b\u5145\u5b57\u6bb5\n    @TableField(.. fill = FieldFill.INSERT)\n    private String fillField;\n\n    ....\n}<\/code><\/pre>\n\n\n\n<p>\u2462\u81ea\u5b9a\u4e49\u5b9e\u73b0\u7c7b MyMetaObjectHandler<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Slf4j\n@Component\npublic class MyMetaObjectHandler implements MetaObjectHandler {\n\n    @Override\n    public void insertFill(MetaObject metaObject) {\n        log.info(\"start insert fill ....\");\n        this.strictInsertFill(metaObject, \"createTime\", LocalDateTime.class, LocalDateTime.now()); \/\/ \u8d77\u59cb\u7248\u672c 3.3.0(\u63a8\u8350\u4f7f\u7528)\n        \/\/ \u6216\u8005\n        this.strictUpdateFill(metaObject, \"createTime\", () -> LocalDateTime.now(), LocalDateTime.class); \/\/ \u8d77\u59cb\u7248\u672c 3.3.3(\u63a8\u8350)\n        \/\/ \u6216\u8005\n        this.fillStrategy(metaObject, \"createTime\", LocalDateTime.now()); \/\/ \u4e5f\u53ef\u4ee5\u4f7f\u7528(3.3.0 \u8be5\u65b9\u6cd5\u6709bug)\n    }\n\n    @Override\n    public void updateFill(MetaObject metaObject) {\n        log.info(\"start update fill ....\");\n        this.strictUpdateFill(metaObject, \"updateTime\", LocalDateTime.class, LocalDateTime.now()); \/\/ \u8d77\u59cb\u7248\u672c 3.3.0(\u63a8\u8350)\n        \/\/ \u6216\u8005\n        this.strictUpdateFill(metaObject, \"updateTime\", () -> LocalDateTime.now(), LocalDateTime.class); \/\/ \u8d77\u59cb\u7248\u672c 3.3.3(\u63a8\u8350)\n        \/\/ \u6216\u8005\n        this.fillStrategy(metaObject, \"updateTime\", LocalDateTime.now()); \/\/ \u4e5f\u53ef\u4ee5\u4f7f\u7528(3.3.0 \u8be5\u65b9\u6cd5\u6709bug)\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\u4e8b\u9879\uff1a<\/p>\n\n\n\n<ul><li>\u586b\u5145\u539f\u7406\u662f\u76f4\u63a5\u7ed9<code>entity<\/code>\u7684\u5c5e\u6027\u8bbe\u7f6e\u503c!!!<\/li><li>\u6ce8\u89e3\u5219\u662f\u6307\u5b9a\u8be5\u5c5e\u6027\u5728\u5bf9\u5e94\u60c5\u51b5\u4e0b\u5fc5\u6709\u503c,\u5982\u679c\u65e0\u503c\u5219\u5165\u5e93\u4f1a\u662f<code>null<\/code><\/li><li><code>MetaObjectHandler<\/code>\u63d0\u4f9b\u7684\u9ed8\u8ba4\u65b9\u6cd5\u7684\u7b56\u7565\u5747\u4e3a:\u5982\u679c\u5c5e\u6027\u6709\u503c\u5219\u4e0d\u8986\u76d6,\u5982\u679c\u586b\u5145\u503c\u4e3a<code>null<\/code>\u5219\u4e0d\u586b\u5145<\/li><li>\u5b57\u6bb5\u5fc5\u987b\u58f0\u660e<code>TableField<\/code>\u6ce8\u89e3,\u5c5e\u6027<code>fill<\/code>\u9009\u62e9\u5bf9\u5e94\u7b56\u7565,\u8be5\u58f0\u660e\u544a\u77e5<code>Mybatis-Plus<\/code>\u9700\u8981\u9884\u7559\u6ce8\u5165<code>SQL<\/code>\u5b57\u6bb5<\/li><li>\u586b\u5145\u5904\u7406\u5668<code>MyMetaObjectHandler<\/code>\u5728 Spring Boot \u4e2d\u9700\u8981\u58f0\u660e<code>@Component<\/code>\u6216<code>@Bean<\/code>\u6ce8\u5165<\/li><li>\u8981\u60f3\u6839\u636e\u6ce8\u89e3<code>FieldFill.xxx<\/code>\u548c<code>\u5b57\u6bb5\u540d<\/code>\u4ee5\u53ca<code>\u5b57\u6bb5\u7c7b\u578b<\/code>\u6765\u533a\u5206\u5fc5\u987b\u4f7f\u7528\u7236\u7c7b\u7684<code>strictInsertFill<\/code>\u6216\u8005<code>strictUpdateFill<\/code>\u65b9\u6cd5<\/li><li>\u4e0d\u9700\u8981\u6839\u636e\u4efb\u4f55\u6765\u533a\u5206\u53ef\u4ee5\u4f7f\u7528\u7236\u7c7b\u7684<code>fillStrategy<\/code>\u65b9\u6cd5<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum FieldFill {\n    \/**\n     * \u9ed8\u8ba4\u4e0d\u5904\u7406\n     *\/\n    DEFAULT,\n    \/**\n     * \u63d2\u5165\u586b\u5145\u5b57\u6bb5\n     *\/\n    INSERT,\n    \/**\n     * \u66f4\u65b0\u586b\u5145\u5b57\u6bb5\n     *\/\n    UPDATE,\n    \/**\n     * \u63d2\u5165\u548c\u66f4\u65b0\u586b\u5145\u5b57\u6bb5\n     *\/\n    INSERT_UPDATE\n}<\/code><\/pre>\n\n\n\n<h3>8.2\u5728springboot\u4e2d\u5b9e\u73b0<\/h3>\n\n\n\n<h4>8.2.1\u9996\u5148\u5728account\u8868\u4e2d\u6dfb\u52a0createTime\u548cupdateTime\u5b57\u6bb5<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/202012060116201.png\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"[\u5916\u94fe\u56fe\u7247\u8f6c\u5b58\u5931\u8d25,\u6e90\u7ad9\u53ef\u80fd\u6709\u9632\u76d7\u94fe\u673a\u5236,\u5efa\u8bae\u5c06\u56fe\u7247\u4fdd\u5b58\u4e0b\u6765\u76f4\u63a5\u4e0a\u4f20(img-vcRYnImm-1607188361050)(E:\\\u65b0\u6280\u672f\u5b66\u4e60\\java_study\\mybatis-plus\u5b66\u4e60\\images\\image-20201125232450730.png)]\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/202012060116201.png\" alt=\"[\u5916\u94fe\u56fe\u7247\u8f6c\u5b58\u5931\u8d25,\u6e90\u7ad9\u53ef\u80fd\u6709\u9632\u76d7\u94fe\u673a\u5236,\u5efa\u8bae\u5c06\u56fe\u7247\u4fdd\u5b58\u4e0b\u6765\u76f4\u63a5\u4e0a\u4f20(img-vcRYnImm-1607188361050)(E:\\\u65b0\u6280\u672f\u5b66\u4e60\\java_study\\mybatis-plus\u5b66\u4e60\\images\\image-20201125232450730.png)]\"\/><\/figure><\/noscript>\n\n\n\n<h4>8.2.2\u5728Account.java\u4e2d\u6dfb\u52a0\u5b57\u6bb5\u4ee5\u53ca\u6ce8\u91ca<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>  \/\/\u63d2\u5165\u65f6\u81ea\u52a8\u751f\u6210\n    @TableField(fill = FieldFill.INSERT)\n    private LocalDateTime createTime;\n    \/\/\u66f4\u65b0\u65f6\u81ea\u52a8\u751f\u6210\n    @TableField(fill = FieldFill.INSERT_UPDATE)\n    private LocalDateTime updateTime;<\/code><\/pre>\n\n\n\n<h4>8.2.3\u5728Component\u5305\u4e2d\u65b0\u5efa\u4e00\u4e2a\u7c7bAccountMetaHandler.java<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.moyisuiying.booksystem.component;\n\nimport com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;\nimport lombok.extern.slf4j.Slf4j;\nimport org.apache.ibatis.reflection.MetaObject;\nimport org.springframework.stereotype.Component;\n\nimport java.time.LocalDateTime;\n\n\/**\n * Classname:AccountMetaHandler\n *\n * @description:\n * @author: \u964c\u610f\u968f\u5f71\n * @Date: 2020-11-25 22:56\n * @Version: 1.0\n **\/\n@Component\n@Slf4j\npublic class AccountMetaHandler  implements MetaObjectHandler {\n    @Override\n    public void insertFill(MetaObject metaObject) {\n        log.info(\"start insert fill ....\");\n        \/\/ \u8d77\u59cb\u7248\u672c 3.3.0(\u63a8\u8350\u4f7f\u7528)\n        this.strictInsertFill(metaObject, \"createTime\", LocalDateTime.class, LocalDateTime.now());\n    }\n\n    @Override\n    public void updateFill(MetaObject metaObject) {\n        log.info(\"start update fill ....\");\n        \/\/ \u8d77\u59cb\u7248\u672c 3.3.0(\u63a8\u8350\u4f7f\u7528)\n        this.strictUpdateFill(metaObject, \"updateTime\", LocalDateTime.class, LocalDateTime.now());\n    }\n}<\/code><\/pre>\n\n\n\n<h3>8.3\u6d4b\u8bd5\u63d2\u5165\u548c\u66f4\u65b0\u64cd\u4f5c<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code> @Test\n    public void testInsert(){\n        Account account = new Account();\n        account.setName(\"\u785d\u9178\u94a0\");\n        account.setPassword(\"ab\");\n       int fla = accountDao.insert(account);\n       System.out.println(fla);\n\n   }<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>@Test\n    public void testUpdate(){\n        Account account = new Account();\n        account.setId(27);\n        account.setName(\"\u674e\u56db\");\n        account.setPassword(\"aaaaa\");\n       int update = accountDao.updateById(account);\n       System.out.println(update);\n   }<\/code><\/pre>\n\n\n\n<p>\u7ecf\u8fc7\u6d4b\u8bd5\u53ef\u4ee5\u53d1\u73b0createTime\u5728\u63d2\u5165\u8bb0\u5f55\u65f6\u4f1a\u81ea\u52a8\u586b\u5145\u6570\u636e\u5e93\u4e2dcreateTime\u7684\u503c\uff1b\u5f53update\u66f4\u65b0\u64cd\u4f5c\u65f6updateTime\u4f1a\u88ab\u81ea\u52a8\u66f4\u65b0\u3002<\/p>\n\n\n\n<h3>9.\u6d4b\u8bd5\u7684\u6e90\u4ee3\u7801\u5df2\u4e0a\u4f20\u5230GitHub\u4e2d\uff1a<a href=\"https:\/\/github.com\/LJF2402901363\/java_study.git\" target=\"_blank\"  rel=\"nofollow\" >https:\/\/github.com\/LJF2402901363\/java_study.git<\/a><\/h3>\n\n\n\n<p><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201206010846543.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br><\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201206010846543.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br><\/p><\/noscript>\n","protected":false},"excerpt":{"rendered":"<p>7.\u4e50\u89c2\u9501 7.1OptimisticLockerInnerInterceptor \u5f53\u8981\u66f4\u65b0\u4e00\u6761\u8bb0\u5f55\u7684\u65f6\u5019\uff0c\u5e0c\u671b\u8fd9\u6761\u8bb0\u5f55\u6ca1\u6709\u88ab\u522b\u4eba &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[158,159],"_links":{"self":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/414"}],"collection":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/comments?post=414"}],"version-history":[{"count":1,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/414\/revisions"}],"predecessor-version":[{"id":415,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/414\/revisions\/415"}],"wp:attachment":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/media?parent=414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/categories?post=414"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/tags?post=414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}