{"id":200744,"date":"2025-05-06T14:29:57","date_gmt":"2025-05-06T06:29:57","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200744\/"},"modified":"2025-05-06T14:29:57","modified_gmt":"2025-05-06T06:29:57","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-mybatis-%e4%b8%ad%e6%a0%b9%e6%8d%ae%e5%8f%98%e9%87%8f%e5%80%bc%e5%8a%a8%e6%80%81%e6%89%a7%e8%a1%8c%e4%b8%8d%e5%90%8c-sql-%e8%af%ad%e5%8f%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200744\/","title":{"rendered":"\u5982\u4f55\u5728 Mybatis \u4e2d\u6839\u636e\u53d8\u91cf\u503c\u52a8\u6001\u6267\u884c\u4e0d\u540c SQL \u8bed\u53e5\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u5728 Mybatis \u4e2d\u6839\u636e\u53d8\u91cf\u503c\u52a8\u6001\u6267\u884c\u4e0d\u540c SQL \u8bed\u53e5\uff1f<\/h1>\n

\u79ef\u7d2f\u77e5\u8bc6\uff0c\u80dc\u8fc7\u79ef\u84c4\u91d1\u94f6\uff01\u6bd5\u7adf\u5728\u6570\u636e\u5e93\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u9047\u5230\u5404\u79cd\u5404\u6837\u7684\u95ee\u9898\uff0c\u5f80\u5f80\u90fd\u662f\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u6ca1\u6709\u638c\u63e1\u597d\u800c\u5bfc\u81f4\u7684\uff0c\u56e0\u6b64\u57fa\u7840\u77e5\u8bc6\u70b9\u7684\u79ef\u7d2f\u662f\u5f88\u91cd\u8981\u7684\u3002\u4e0b\u9762\u672c\u6587\u300a\u5982\u4f55\u5728 Mybatis \u4e2d\u6839\u636e\u53d8\u91cf\u503c\u52a8\u6001\u6267\u884c\u4e0d\u540c SQL \u8bed\u53e5\uff1f\u300b\uff0c\u5c31\u5e26\u5927\u5bb6\u8bb2\u89e3\u4e00\u4e0b\u77e5\u8bc6\u70b9\uff0c\u82e5\u662f\u4f60\u5bf9\u672c\u6587\u611f\u5174\u8da3\uff0c\u6216\u8005\u662f\u60f3\u641e\u61c2\u5176\u4e2d\u67d0\u4e2a\u77e5\u8bc6\u70b9\uff0c\u5c31\u8bf7\u4f60\u7ee7\u7eed\u5f80\u4e0b\u770b\u5427~<\/p>\n

<\/p>\n

\u6839\u636e\u53d8\u91cf\u503c\u52a8\u6001\u6267\u884c\u4e0d\u540c sql \u8bed\u53e5<\/strong><\/p>\n

\u5728\u4f7f\u7528 mybatis \u7f16\u5199 xml \u914d\u7f6e\u6587\u4ef6\u65f6\uff0c\u53ef\u4ee5\u5229\u7528 if \u6807\u7b7e\u6839\u636e\u53d8\u91cf\u503c\u52a8\u6001\u6267\u884c sql \u8bed\u53e5\uff0c\u5b9e\u73b0\u4e0d\u540c\u6570\u636e\u5e93\u7684\u517c\u5bb9\u3002<\/p>\n

\u6bd4\u5982\uff0c\u6709\u4e00\u4e2a\u5168\u5c40\u914d\u7f6e\u7c7b globalvariable\uff1a<\/p>\n

public class globalvariable {\n    public int databasetype; \/\/\u6570\u636e\u5e93\u7c7b\u578b\uff0c1mysql\uff0c2\u8fbe\u68a6\n}<\/pre>\n
\u5bf9\u5e94\u7684 xml \u6587\u4ef6\u53ef\u4ee5\u6309\u5982\u4e0b\u7f16\u5199\uff0c\u4ee5\u5b9e\u73b0\u6839\u636e databasetype \u5224\u65ad\u6267\u884c\u4e0d\u540c sql \u8bed\u53e5\uff1a<\/p>\n
...\n\n<select id=\"selectone\">\n    <if test=\"databasetype == 1\">\n        ...\n    <\/if>\n    <if test=\"databasetype == 2\">\n        ...\n    <\/if>\n<\/select>\n\n...<\/pre>\n
\u8fd9\u6837\uff0c\u5c31\u53ef\u4ee5\u6839\u636e\u6570\u636e\u5e93\u7c7b\u578b\u7684\u4e0d\u540c\uff0c\u6267\u884c\u4e0d\u540c\u7684 sql \u8bed\u53e5\u3002<\/p>\n
\u6b64\u5916\uff0cmybatis \u8fd8\u6709\u81ea\u5e26\u7684\u6570\u636e\u5e93\u5382\u5546\u6807\u8bc6\uff08databaseidprovider\uff09\uff0c\u53ef\u4ee5\u6839\u636e\u6570\u636e\u5e93\u7684\u4e0d\u540c\u81ea\u52a8\u9009\u62e9\u6267\u884c\u5bf9\u5e94\u7684 sql \u8bed\u53e5\u3002<\/p>\n
\u6bd4\u5982\uff0c\u53ef\u4ee5\u6309\u7167\u5982\u4e0b\u914d\u7f6e\uff1a<\/p>\n
...\n\n<select id=\"selectAll\" resultType=\"com.alen.trial.multilds.model.Multil\" databaseId=\"mysql\">\n     select * from multil\n<\/select>\n<select id=\"selectAll\" resultType=\"com.alen.trial.multilds.model.Multil\" databaseId=\"oracle\">\n       select id from multil\n<\/select>\n\n...<\/pre>\n
\u8fd9\u6837\uff0c\u4e0d\u540c\u6570\u636e\u5e93\u7684 sql \u8bed\u53e5\u5c31\u4f1a\u6839\u636e\u6570\u636e\u5e93\u5382\u5546\u6807\u8bc6\u81ea\u52a8\u9009\u62e9\u6267\u884c\u3002<\/p>\n
\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u5982\u4f55\u5728 Mybatis \u4e2d\u6839\u636e\u53d8\u91cf\u503c\u52a8\u6001\u6267\u884c\u4e0d\u540c SQL \u8bed\u53e5\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n
\n
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\u5982\u4f55\u5728 Mybatis \u4e2d\u6839\u636e\u53d8...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200744","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200744","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200744"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200744\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200744"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200744"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200744"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}