{"id":14226,"date":"2023-12-04T00:56:14","date_gmt":"2023-12-03T16:56:14","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=14226"},"modified":"2023-12-04T00:58:01","modified_gmt":"2023-12-03T16:58:01","slug":"mybatis-shi-fou-ke-yi-ying-she-enum-mei-ju-lei-2","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/mybatis-shi-fou-ke-yi-ying-she-enum-mei-ju-lei-2\/","title":{"rendered":"MyBatis \u662f\u5426\u53ef\u4ee5\u6620\u5c04 Enum \u679a\u4e3e\u7c7b\uff1f"},"content":{"rendered":"<p>\u662f\u7684\uff0cMyBatis \u53ef\u4ee5\u6620\u5c04\u679a\u4e3e\u7c7b\uff08Enum\uff09\u3002\u5728 MyBatis \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 EnumTypeHandler \u5c06\u6570\u636e\u5e93\u4e2d\u7684\u503c\u6620\u5c04\u5230\u5bf9\u5e94\u7684 Java \u679a\u4e3e\u7c7b\u3002<\/p>\n<p>\u8981\u5728 MyBatis \u4e2d\u6620\u5c04\u679a\u4e3e\u7c7b\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u914d\u7f6e\uff1a<\/p>\n<h3>1. \u521b\u5efa\u679a\u4e3e\u7c7b\uff1a<\/h3>\n<pre><code class=\"language-java  line-numbers\">public enum UserType {\n    ADMIN,\n    USER,\n    GUEST\n}\n<\/code><\/pre>\n<h3>2. \u7f16\u5199 TypeHandler \u7c7b\uff1a<\/h3>\n<p>\u521b\u5efa\u4e00\u4e2a\u7ee7\u627f\u81ea BaseTypeHandler \u7684\u679a\u4e3e\u7c7b\u578b\u5904\u7406\u5668\uff1a<\/p>\n<pre><code class=\"language-java  line-numbers\">import org.apache.ibatis.type.BaseTypeHandler;\nimport org.apache.ibatis.type.JdbcType;\n\nimport java.sql.CallableStatement;\nimport java.sql.PreparedStatement;\nimport java.sql.ResultSet;\nimport java.sql.SQLException;\n\npublic class UserTypeHandler extends BaseTypeHandler&lt;UserType&gt; {\n    @Override\n    public void setNonNullParameter(PreparedStatement preparedStatement, int i, UserType userType, JdbcType jdbcType) throws SQLException {\n        preparedStatement.setString(i, userType.name());\n    }\n\n    @Override\n    public UserType getNullableResult(ResultSet resultSet, String s) throws SQLException {\n        return UserType.valueOf(resultSet.getString(s));\n    }\n\n    @Override\n    public UserType getNullableResult(ResultSet resultSet, int i) throws SQLException {\n        return UserType.valueOf(resultSet.getString(i));\n    }\n\n    @Override\n    public UserType getNullableResult(CallableStatement callableStatement, int i) throws SQLException {\n        return UserType.valueOf(callableStatement.getString(i));\n    }\n}\n<\/code><\/pre>\n<h3>3. \u914d\u7f6e\u6620\u5c04\u6587\u4ef6\u6216\u6ce8\u89e3\uff1a<\/h3>\n<p>\u5728\u6620\u5c04\u6587\u4ef6\u6216\u6ce8\u89e3\u4e2d\u914d\u7f6e\u679a\u4e3e\u7c7b\u7684\u5b57\u6bb5\u5bf9\u5e94\u7684 TypeHandler\uff1a<\/p>\n<pre data-language=XML><code class=\"language-markup  line-numbers\">&lt;resultMap id=\"userResultMap\" type=\"User\"&gt;\n    &lt;id property=\"id\" column=\"user_id\"\/&gt;\n    &lt;result property=\"name\" column=\"user_name\"\/&gt;\n    &lt;result property=\"userType\" column=\"user_type\" javaType=\"UserType\" typeHandler=\"com.example.UserTypeHandler\"\/&gt;\n&lt;\/resultMap&gt;\n<\/code><\/pre>\n<p>\u6216\u8005\u4f7f\u7528\u6ce8\u89e3\uff1a<\/p>\n<pre><code class=\"language-java  line-numbers\">@Results({\n    @Result(property = \"userType\", column = \"user_type\", javaType = UserType.class, typeHandler = UserTypeHandler.class)\n})\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u914d\u7f6e\u6307\u5b9a\u4e86\u679a\u4e3e\u7c7b UserType \u5bf9\u5e94\u7684 TypeHandler\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u7684\u5b57\u7b26\u4e32\u503c\u6620\u5c04\u5230 UserType \u679a\u4e3e\u7c7b\u578b\uff0c\u5e76\u5728\u67e5\u8be2\u65f6\u8fdb\u884c\u76f8\u5e94\u7684\u8f6c\u6362\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u662f\u7684\uff0cMyBatis \u53ef\u4ee5\u6620\u5c04\u679a\u4e3e\u7c7b\uff08Enum\uff09\u3002\u5728 MyBatis \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 EnumTypeHandl [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[113],"tags":[],"class_list":["post-14226","post","type-post","status-publish","format-standard","hentry","category-mybatis"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=14226"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14226\/revisions"}],"predecessor-version":[{"id":14227,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14226\/revisions\/14227"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=14226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=14226"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=14226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}