{"id":1028,"date":"2022-08-17T17:15:26","date_gmt":"2022-08-17T09:15:26","guid":{"rendered":"https:\/\/usei.cn\/?p=1028"},"modified":"2023-04-03T09:38:29","modified_gmt":"2023-04-03T01:38:29","slug":"mybatis-%e6%9e%9a%e4%b8%be%e5%80%bc%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/usei.cn\/index.php\/2022\/08\/17\/mybatis-%e6%9e%9a%e4%b8%be%e5%80%bc%e5%a4%84%e7%90%86\/","title":{"rendered":"Mybatis \u679a\u4e3e\u503c\u5b58\u53d6\u6570\u636e\u5e93\u5904\u7406"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">\u5185\u7f6e\u7684\u679a\u4e3e\u5904\u7406\u5668<\/h3>\n\n\n\n<p>mybatis\u5185\u7f6e\u4e86\u4e24\u4e2a\u679a\u4e3e\u7c7b\u578b\u5904\u7406\u5668\uff0cEnumTypeHandler\u548cEnumOrdinalTypeHandler\uff0c\u8fd9\u4e24\u4e2a\u7c7b\u578b\u90fd\u4e0d\u597d\u7528\uff0c\u4e00\u822c\u4e5f\u662f\u6211\u4eec\u81ea\u5df1\u5b9e\u73b0\u679a\u4e3e\u7684\u7c7b\u578b\u5904\u7406\u5668\u3002<\/p>\n\n\n\n<p>EnumTypeHandler\u5b58\u5165\u6570\u636e\u5e93\u7684\u662f\u679a\u4e3e\u7684name\uff0cEnumOrdinalTypeHandler\u5b58\u5165\u6570\u636e\u5e93\u7684\u662f\u679a\u4e3e\u7684\u4f4d\u7f6e\u3002\u4f8b\u5982\u4e0b\u65b9\u7684\u679a\u4e3e\uff0c\u5f53\u6211\u4eec\u6709\u4e00\u4e2a\u679a\u4e3e\u503c\u662fEStatus.init\u65f6\uff0c\u8fd9\u65f6\u6211\u4eec\u4f7f\u7528mybatis\u7684EnumTypeHandler\u5b58\u5165\u6570\u636e\u5e93\u7684\u662f&#8221;init&#8221;\u5b57\u7b26\u4e32\uff1b\u800cEnumOrdinalTypeHandler\u5b58\u5165\u7684\u662f3,\u56e0\u4e3ainit\u662f\u7b2c\u56db\u4e2a\u503c\uff0c\u7b2c\u4e00\u4e2a\u503cdisable\u7684index\u662f0\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum EStatus {\n\n    disable(\"0\"), enable(\"1\"), deleted(\"2\"),\n    init(\"10\"), start(\"11\"), wait(\"12\"), end(\"13\"); \n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u7f16\u5199\u679a\u4e3e\u63a5\u53e3\u7ea6\u675f<\/h3>\n\n\n\n<p>\u9996\u5148\u5b9a\u4e49\u63a5\u53e3\uff0c\u63d0\u4f9b\u83b7\u53d6\u6570\u636e\u5e93\u5b58\u53d6\u7684\u503c\u5f97\u65b9\u6cd5\uff0c\u65b9\u4fbf\u591a\u4e2a\u679a\u4e3e\uff0c\u4f7f\u7528\u4e00\u4e2aHandler\u5904\u7406<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.join.payment.utils;\n\n\/**\n * \u679a\u4e3e\u7ea6\u675f\n *\/\npublic interface BaseCodeEnum {\n    int getCode();\/\/\u5fc5\u987b\u5305\u542b\u65b9\u6cd5\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u7f16\u5199 EnumTypeHandler<\/h3>\n\n\n\n<p>\u5b9a\u4e49mybatis\u7684typeHandler\u6269\u5c55\u7c7b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.join.payment.utils;\n\nimport 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\n\/**\n * \u901a\u7528int \u679a\u4e3e\u8f6c\u6362\u5668\n * @author \u8303\u6587\u521a\n *\/\npublic class EnumTypeHandler extends BaseTypeHandler&lt;BaseCodeEnum&gt;{\n\n    private Class&lt;BaseCodeEnum&gt; type;\n    private final BaseCodeEnum&#91;] enums;\n    \/**\n     * \u8bbe\u7f6e\u914d\u7f6e\u6587\u4ef6\u8bbe\u7f6e\u7684\u8f6c\u6362\u7c7b\u4ee5\u53ca\u679a\u4e3e\u7c7b\u5185\u5bb9\uff0c\u4f9b\u5176\u4f59\u65b9\u6cd5\u66f4\u4fbf\u6377\u9ad8\u6548\u7684\u5b9e\u73b0\n     * @param type \u914d\u7f6e\u6587\u4ef6\u4e2d\u8bbe\u7f6e\u7684\u8f6c\u6362\u7c7b\n     *\/\n    public EnumTypeHandler(Class&lt;BaseCodeEnum&gt; type) {\n        if (type == null) {\n            throw new IllegalArgumentException(\"Type argument cannot be null\");\n        }\n        this.type = type;\n        this.enums = type.getEnumConstants();\n        if (this.enums == null) {\n            throw new IllegalArgumentException(type.getSimpleName()\n                    + \" does not represent an enum type.\");\n        }\n    }\n    \/**\n     * \u679a\u4e3e\u7c7b\u578b\u8f6c\u6362\uff0c\u56e0\u4e3a\u6784\u9020\u51fd\u6570\u83b7\u53d6\u4e86\u679a\u4e3e\u7684\u5b50\u7c7benums\uff0c\u8ba9\u904d\u5386\u66f4\u52a0\u9ad8\u6548\u5feb\u6377\n     * @param code \u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u7684\u81ea\u5b9a\u4e49code\u5c5e\u6027\n     * @return code\u5bf9\u5e94\u7684\u679a\u4e3e\u7c7b\n     *\/\n    private BaseCodeEnum locateEnumStatus(int code) {\n        for(BaseCodeEnum status : enums) {\n            if(status.getCode() ==code ) {\n                return status;\n            }\n        }\n        throw new IllegalArgumentException(\"\u672a\u77e5\u7684\u679a\u4e3e\u7c7b\u578b\uff1a\" + code + \",\u8bf7\u6838\u5bf9\" + type.getSimpleName());\n    }\n\n    @Override\n    public void setNonNullParameter(PreparedStatement ps, int i, BaseCodeEnum parameter, JdbcType jdbcType) throws SQLException {\n        \/\/ baseTypeHandler\u5df2\u7ecf\u4f5c\u4e86parameter\u7684null\u5224\u65ad\n        ps.setInt(i, parameter.getCode());\n    }\n\n    @Override\n    public BaseCodeEnum getNullableResult(ResultSet rs, String columnName) throws SQLException {\n        \/\/ \u6839\u636e\u6570\u636e\u5e93\u5b58\u50a8\u7c7b\u578b\u51b3\u5b9a\u83b7\u53d6\u7c7b\u578b\uff0c\u672c\u4f8b\u5b50\u4e2d\u6570\u636e\u5e93\u4e2d\u5b58\u653eINT\u7c7b\u578b\n        int i = rs.getInt(columnName);\n        if (rs.wasNull()) {\n            return null;\n        } else {\n            \/\/ \u6839\u636e\u6570\u636e\u5e93\u4e2d\u7684code\u503c\uff0c\u5b9a\u4f4dEnumStatus\u5b50\u7c7b\n            return locateEnumStatus(i);\n        }\n    }\n\n    @Override\n    public BaseCodeEnum getNullableResult(ResultSet rs, int columnIndex) throws SQLException {\n        \/\/ \u6839\u636e\u6570\u636e\u5e93\u5b58\u50a8\u7c7b\u578b\u51b3\u5b9a\u83b7\u53d6\u7c7b\u578b\uff0c\u672c\u4f8b\u5b50\u4e2d\u6570\u636e\u5e93\u4e2d\u5b58\u653eINT\u7c7b\u578b\n        int i = rs.getInt(columnIndex);\n        if (rs.wasNull()) {\n            return null;\n        } else {\n            \/\/ \u6839\u636e\u6570\u636e\u5e93\u4e2d\u7684code\u503c\uff0c\u5b9a\u4f4dEnumStatus\u5b50\u7c7b\n            return locateEnumStatus(i);\n        }\n    }\n\n    @Override\n    public BaseCodeEnum getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {\n        \/\/ \u6839\u636e\u6570\u636e\u5e93\u5b58\u50a8\u7c7b\u578b\u51b3\u5b9a\u83b7\u53d6\u7c7b\u578b\uff0c\u672c\u4f8b\u5b50\u4e2d\u6570\u636e\u5e93\u4e2d\u5b58\u653eINT\u7c7b\u578b\n        int i = cs.getInt(columnIndex);\n        if (cs.wasNull()) {\n            return null;\n        } else {\n            \/\/ \u6839\u636e\u6570\u636e\u5e93\u4e2d\u7684code\u503c\uff0c\u5b9a\u4f4dEnumStatus\u5b50\u7c7b\n            return locateEnumStatus(i);\n        }\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e3e\u4e2aOrderStateEnumde\u4f8b\u5b50<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.join.payment.domain;\n\nimport com.join.payment.utils.BaseCodeEnum;\n\n\/**\n * \u8ba2\u5355\u72b6\u6001\n * @author \u8303\u6587\u521a\n *\/\npublic enum OrderStateEnum implements BaseCodeEnum {\n    \/**\n     * \u4ea4\u6613\u5173\u95ed\n     *\/\n    CLOSE(-1),\n    \/**\n     * \u9ed8\u8ba4\n     *\/\n    DEFAULT(0),\n    \/**\n     * \u4ea4\u6613\u4e2d\n     *\/\n    APPLY(1),\n    \/**\n     * \u4ea4\u6613\u6210\u529f\n     *\/\n    SUCCESS(2);\n\n    OrderStateEnum(int code)\n    {\n        this.code = code;\n    }\n    private final int code;\n\n    @Override\n    public int getCode(){ return code; }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Mapper \u6587\u4ef6\u4e2d\u4fee\u6539\u5904\u7406\u5668<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;resultMap type=\"PayOrder\" id=\"PayOrderResult\"&gt;\n    &lt;result property=\"id\"    column=\"id\"    \/&gt;\n    &lt;result property=\"state\"    column=\"state\" typeHandler=\"com.join.payment.utils.EnumTypeHandler\"   \/&gt;\n&lt;\/resultMap&gt;\n&lt;insert id=\"insertPayOrder\" parameterType=\"PayOrder\"&gt;\n        insert into pay_order\n        &lt;trim prefix=\"(\" suffix=\")\" suffixOverrides=\",\"&gt;\n            &lt;if test=\"id != null\"&gt;id,&lt;\/if&gt;\n            &lt;if test=\"state != null\"&gt;state,&lt;\/if&gt;\n         &lt;\/trim&gt;\n        &lt;trim prefix=\"values (\" suffix=\")\" suffixOverrides=\",\"&gt;\n            &lt;if test=\"id != null\"&gt;#{id},&lt;\/if&gt;\n            &lt;if test=\"state != null\"&gt;#{state,typeHandler=com.join.payment.utils.EnumTypeHandler},&lt;\/if&gt;\n         &lt;\/trim&gt;\n&lt;\/insert&gt;\n\n &lt;update id=\"updatePayOrder\" parameterType=\"PayOrder\"&gt;\n        update pay_order\n        &lt;trim prefix=\"SET\" suffixOverrides=\",\"&gt;\n            &lt;if test=\"state != null\"&gt;state = #{state,typeHandler=com.join.payment.utils.EnumTypeHandler},\n        &lt;\/trim&gt;\n        where id = #{id}\n    &lt;\/update&gt;\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5185\u7f6e\u7684\u679a\u4e3e\u5904\u7406\u5668 mybatis\u5185\u7f6e\u4e86\u4e24\u4e2a\u679a\u4e3e\u7c7b\u578b\u5904\u7406\u5668\uff0cEnumTypeHandler\u548cEnumOrdina [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,82],"tags":[],"class_list":["post-1028","post","type-post","status-publish","format-standard","hentry","category-java","category-mybatis"],"_links":{"self":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts\/1028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1028"}],"version-history":[{"count":8,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts\/1028\/revisions"}],"predecessor-version":[{"id":1041,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/posts\/1028\/revisions\/1041"}],"wp:attachment":[{"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/usei.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}